|Year : 2020 | Volume
| Issue : 3 | Page : 202-215
Implementation of nanotechnology in drug analysis as a new solution for old problems: a review
Wafaa A Zaghary1, Nermeen A Abdallah2, Ayman A Abdelrahim3, Marwa A Zanoun2, Emily T Hanna2, Tamer M Sakr4
1 Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Helwan University, Egypt
2 Department of Nutrition Biochemistry and Metabolism, National Nutrition Institute, Egypt
3 Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Seoul National University, Seoul, South Korea
4 Department of Radioactive Isotopes and Generator, Hot Labs Center, Atomic Energy Authority, Cairo, Egypt
|Date of Submission||08-Apr-2020|
|Date of Decision||25-Jun-2020|
|Date of Acceptance||19-Jul-2020|
|Date of Web Publication||30-Sep-2020|
PhD Tamer M Sakr
Department of Radioactive Isotopes and Generator, Hot Labs Center, Atomic Energy Authority, PO Box 13759, Cairo, 13759
Source of Support: None, Conflict of Interest: None
There is an increasing interest in nanoparticles nowadays. In this review, we will enlighten the use of nanoparticles for detection and quantification of some drugs, antibiotics, antivirals, and amino acids using different analytical methods.
Keywords: analytical methods, drugs, nanoparticles, preparation
|How to cite this article:|
Zaghary WA, Abdallah NA, Abdelrahim AA, Zanoun MA, Hanna ET, Sakr TM. Implementation of nanotechnology in drug analysis as a new solution for old problems: a review. Egypt Pharmaceut J 2020;19:202-15
|How to cite this URL:|
Zaghary WA, Abdallah NA, Abdelrahim AA, Zanoun MA, Hanna ET, Sakr TM. Implementation of nanotechnology in drug analysis as a new solution for old problems: a review. Egypt Pharmaceut J [serial online] 2020 [cited 2021 Jun 24];19:202-15. Available from: http://www.epj.eg.net/text.asp?2020/19/3/202/296801
| L-cysteine analysis|| |
Nanoparticles (NPs) were used for quantification of L-cysteine using multiwalled carbon nanotubes (MWCNTs) , or silver nanoparticles (AgNPs)  before measuring by ultraviolet (UV)–visible (Vis) spectrophotometer. Preparation methods of such NPs in the literature were found to follow a specific scheme as follows.
The pretreatment of MWCNTs occurred in two steps: first, oxidation by acids was done by refluxing 500 mg of MWCNTs in 50 ml H2SO4-HNO3 solution (75 : 25, V/V) for 4 h at a temperature of 60°C. The CNTs were filtered and washed with deionized water, and then dried under vacuum at 100°C for 5 h. After that, the dried MWCNTs were immersed in 1 ml dimethyl formamide, then 10 ml of thionyl chloride was added, and the mixture was stirred for 1 h, and then it was kept for 1 day under nitrogen at 80°C. After that, the MWCNTs were washed with acetone and allowed to dry under vacuum for 1 day at 25°C . Overall, 500 mg of pretreated MWCNTs was suspended in acetonitrile (20 ml) for 10 min. Then 1 ml of methyl acrylic acid and 50 mg of NaHCO3 were added, and the whole mix was allowed to stand under nitrogen for 2 h at 80°C. After that, the resulting methyl acrylic acid (MAA)/MWCNTs were filtered and washed with deionized water and dried under vacuum . In a 100-ml round-bottom flask, 20 ml of acetonitrile was added, and then 1 mmol of L-cysteine (purchased from Sigma-Aldrich (St Louis, Missouri, USA; http://www.sigma-aldrich.com) and 300 mg of MAA/MWCNTs along with 4.0 mmol of MAA were added to the flask, and the whole mixture was incubated at 25°C for 60 min. After that, 20 mmol of ethylene glycol dimethacrylate was added, and the mixture was washed with nitrogen for the purpose of oxygen removal. The washing process lasted for 10 min. Then the polymerization process started by adding 30 mg of azobisisobutyronitrile and allowing it to react with the mixture for 24 h at 60°C. A solution of 10% acetic acid in ethanol was used to wash the resulting polymer for the removal of template. The washing was considered complete when the template was no longer detected by the spectrophotometer. Then the resulting molecularly imprinted polymers MWCNTs were dried under vacuum for 0.5 h at 60°C . An aliquot of a 50 ng/ml L-cysteine solution was added to a 250-ml beaker, and the pH was brought down to 6.5 using HCl. After that, 50 mg of the previously prepared molecularly imprinted polymers/MWCNTs was added to the mixture, which was then agitated for 20 min. Then the solution was centrifuged for 3 min at 3500 rpm to remove the supernatant, and the adsorbents were eluted using 1.5 ml of 10% acetic acid in methanol. Then, 75 μl of 0.0005 molar DDO was added, and the solution was allowed to stand for 20 min at room temperature. After that, the solution was measured spectrophotometrically at 478 nm using a UV–vis spectrophotometer model SPECORD 210 (Analytik jena, Germany) with a 300-µl quartz microcell (Fisher Co., Baden-Württemberg, Germany) . Another method for determination of L-cysteine employed AgNPs as follows: a solution of HNO3/HCl was prepared, and then directly used to soak all glassware to be used in this method. After that, the glassware was washed with water and dried. A 7.0×10−5 M solution of AgNO3 was prepared, and an appropriate amount of polyvinylpyrrolidone was added. Then 10 ml of 3×10−2 molar sodium borohydride solution was added drop wise with vigorous shaking. When the colorless solution turned into light yellow, the shaking was stopped and the formed AgNP solution was stored in dark place at 25°C for 24 h, to avoid the possible interference from the hydrogen gas that results from the interaction between the sodium borohydride and water .
| Dexmedetomidine analysis|| |
Sodium dodecyl sulfate (SDS)-modified maghemite nanoparticles (MNPs) have been developed for removal, preconcentration, and spectrophotometric determination of trace amounts of a naphthalene analog of anesthetic dexmedetomidine at 280 nm using a double-beam UV–vis spectrophotometer (Perkin Elmer, Akron, Ohio, USA, Lambda 45) . The used 4-(1-(naphthalene-1-yl) ethyl)-1H-imidazole (NMED) was synthesized according to a previously reported method. After preparation of MNPs , they were coated with SDS using 1.0 ml of 5% SDS solution to each 0.1 g of the MNPs, followed by vigorous stirring for 1 min. After that the beaker was put on a magnetic plate and allowed to stand until the MNPs settled at the bottom of the beaker. Then, the supernatant was decanted, and the MNPs were washed with double-distilled water to remove the excess SDS . Overall, 150 ml of a solution of 10−4–10−6 M of NMED was prepared and added to 0.07 g of SDSMNPs, and the pH of the solutions was adjusted to 3.0 and then the solutions were stirred for 0.5 h. A gradual decrease in NMED concentration was caused by its adsorption on the surfacy of the SDSMNPs. After that, the MNPs loaded with NMED were isolated from solution using a magnetic plate, and the NMED was separated from the MNPs using 1.0 ml of 50% acetonitrile in ethanol, and the concentration of NMED was determined by a spectrophotometer at 280 nm . The efficiency of the MNPs to remove the NMED was calculated as follows:
where C0 and Ct are the initial and final (after adsorption) concentrations of the drug in mol/l  ([Figure 1]).
|Figure 1 Schematic figure of maghemite NP use in dexmedetomidine determination. NP, nanoparticle.|
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| Clozapine analysis|| |
Antipsychotic drug clozapine (purchased from Fluka, St. Louis, Missouri, USA) was electrochemically determined via an Autolab (model PGSTAT 101) using MWCNTs and NPs . Preparing the electrode for detecting clozapine is a multistep process. After polishing with alumina powder slurries, the GC electrode was sonicated with ethanol : distilled water solution (1 : 1 V/V) for 1 min. After that, the bare electrode was scanned in the potential range of 0 : 1.6 V by cyclic voltammetry in the electrolyte of H2SO4 (0.5 M) . For the purpose of modifying the electrode, three types of suspension were utilized:
- MWCNTs in methanol (MWM): equal amounts of MWCNTs and methanol were mixed together with sonication for 0.5 h.
- MWCNTs and WO3 in methanol (MWWM): equal quantities of MWCNTs and WO3 NPs were suspended in methanol and sonicated for 0.5 h.
- MWCNTs and WO3 in presence of α-terpinol (MWWT): equal amounts of MWCNTs and WO3 NPs were suspended in 10% v/v solution of terpinol/methanol and sonicated for 0.5 h.
To prepare the electrode, 1 μl of each of the three suspensions was deposited on the surface of the electrode and was allowed to dry .
| Tetracycline analysis|| |
It was found that NPs were widely employed in the detection and quantification of tetracyclines (TCs) in urine and milk samples , with gold nanoclusters (AuNCs) being used in the determination of TCs using a Hitachi F-7000 fluorescence spectrophotometer (Tokyo, Japan) , and AgNPs  being used to enhance their fluorescence, as the fluorescent carbon NPs were quenched once TCs were introduced . Moreover, Fe3O4 magnetic nanoparticles and oleic acid were used for UV–vis spectroscopic determination (obtained via Analytik Jena SPECORD-250spectrophotometer in the range of 190–1000 nm) and voltammetric determination [via Autolab potentiostat/galvanostat (PGSTAT-302N), ECO Chemie, Utrecht, the Netherlands] of TCs purchased from Merck Company (Kenilworth, New Jersy, USA) . As for the preparation of these NPs, various methods were employed. For instance, three types of AuNCs can be synthesized and utilized. The first type ([email protected]) was prepared by mixing equal volumes of 10 mmol/l of HAuCL4 solution and 50 mg/ml bovine serum albumin (BSA) solution with stirring at 37°C. After 2 min, 1.0 M NaOH (5% of the initial volume of the mixture) was added, and the whole solution was allowed to stand at 37°C for 24 h. The second type ([email protected]C12) was prepared by mixing 100 μM HAuCl4, 25 μM DNAC12, and 50 mmol/l citrate together and allowing the mixture to stand at 25°C for 24 h. As for the third type ([email protected]), it was prepared by mixing 8 ml of 10 mmol/l HAuCL4 and 24 ml of 0.1 M histidine solution, and allowing the mixture to stand for 2 h at room temperature. Eu2O3 was dissolved in a small amount of 0.1 M HNO3 and diluted with water. Then TC was added, and the whole EuTC solution was diluted appropriately to a concentration of 2.5×10−5  ([Figure 2]).
|Figure 2 Schematic figure of the detection of tetracycline based on AgNP-enhanced fluorescence of Eu3+. AgNPs, silver nanoparticles.|
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Another method for the detection of TC was developed. This method employs the AgNPs-enhanced fluorescence of europium Eu3+ purchased from Rewin Rare Earth Metal Materials Co. Ltd (Baotou, China) . The NPs for this method were prepared by adding 1 ml of 10 mmol/l silver nitrate and 1 ml of 500 mmol/l citrate to 47 ml of water with continuous stirring, then the mixture was allowed to stand for 10 min at 25°C. After that, the formed silver nitrate was reduced by using 600 μl of freshly prepared sodium borohydride while vigorously stirring the solution. The reduction process was allowed to continue for 30 min before the solution was stored at 4°C overnight to allow for the formation of AgNPs, which is indicated by the change of the solution’s color into bright yellow . To prepare Eu3+-AgNPs, an excessive amount of Eu3+ was added to the AgNP solution, and then the mixture was centrifuged to remove the unbound Eu3+, and the formed Eu3+-AgNPs were suspended in HEPES buffer by ultrasonic waves . After obtaining the Eu-citrate-stabilized AgNPs solution (Eu3+-AgNPs), the procedure for detecting TC in the analyte starts by preparing different volumes of TC to the Eu3+-AgNP solution, and the volume is completed to 100 μl using HEPES buffer, and then the reaction is allowed to continue for 5 min at 25°C. The fluorescence intensity of the mixture is then measured at 390 nm using a UV-3150 spectrophotometer (Shimadzu, Japan) .
| Oxytetracycline analysis|| |
Oxytetracycline (OTC) with 99% purity was purchased from Sigma-Aldrich and was determined by [email protected]3O4. The crystal structure was measured by analyzing the radiograph powder diffraction patterns (M18XHF-SRA; MAC Science, Kanagawa, Japan) . The copper nanoparticles (CuNPs) are prepared by reducing a solution of copper sulfate using sodium borohydride (added dropwise to the copper sulfate at a rate of 10 ml/min) with stirring. The reaction is allowed to continue till the CuNPs are precipitated (which is denoted by the color change of the solution from blue to brown, to black). The solution is then centrifuged at 3000 rpm to separate the NPs. The NPs are then washed with deionized water and methanol, and then dried for 1 day at 60°C . The [email protected]3O4 core-shell NPs are prepared by first sonicating 0.89 g CuNPs with 5 g iron (III) acetylacetonate for 0.5 h. After that, the mixture is vigorously stirred for 10 min, and then reduced using sodium borohydride (which is added dropwise with vigorous stirring), and the mixture is allowed to stand at 105°C for 0.5 h. After cooling the mixture, the NPs are isolated using a magnet and washed with deionized water, methanol, and ethanol, and dried for 1 day at 60°C . The Fe3O4 NPs can be prepared in a similar manner but without using the CuNPs in the process . Furthermore, the oxidative degradation of OTC can be performed using 20-mmol/l hydrogen peroxide in the presence of 0.5-g [email protected]3O4-CSNs. While the reaction continued, samples from the solution are taken at different times, and the reaction in these samples was stopped immediately using methanol, and the concentrations of both OTC and the hydrogen peroxide are analyzed; the OTC is analyzed using high-performance liquid chromatography (HPLC) (Ultimate 3000; Dionex, Sunnyvale, California, USA), and the hydrogen peroxide using UV/vis spectrophotometer (UV-mini 1240; Shimadzu). Furthermore, the [email protected]3O4-CSNs were found to be reusable as a catalyst, as they were successfully isolated via a magnet. After washing and drying, they were tested for five times in five subsequent degradation reactions of OTC and were still functional .
| Moxifloxacin analysis|| |
Moxifloxacin (MF) detection depends on the finding that weak chemiluminescence signal intensity of calcein–KMnO4 intensifies by introducing AgNPs in the presence of MF, which is obtained from urine samples, or as therapeutic dosage form (Avolex) or purchased from Sigma-Aldrich . To prepare these NPs, the authors maintained 50 ml of AgNO3 at a constant temperature while stirring in an oil bath for 6 h. Then 60 ml of 1 M NH4OH in a flask was put in a water bath at room temperature, then the two flasks were exposed to daylight lamp and connected together to allow for transfer of the ammonia gas from the second flask to the flask with the silver nitrate solution, and consequently to allow for the reaction between them to occur and the AgNPs to be formed, and the signal intensity is measured using A Spex (Model F111; SPEX Industries, Edison, New Jersey, USA) spectrofluorometer furnished with a coiled glass flow cell (1.0 mm i.d., 20 mm total diameter) . Furthermore, various methods for enhancement of the analysis of other antibiotics were developed, like ciprofloxacin, which was measured by RP-HPLC at 278 nm using Eudragit RS100 or RL100/PLGA NPs ; azithromycin, which was detected by double-beam spectrophotometer using unmodified citrate-capped AgNPs ,; and vancomycin, which was determined using lipid–polymer NPs  ([Figure 3]).
|Figure 3 Schematic figure of suggested mechanism for colorimetric sensing of azithromycin upon aggregation of silver nanoparticles.|
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| Acyclovir analysis|| |
NPs have been used for detection of anti-viral drugs. An example of that is acyclovir (ACV) in pharmaceutical formulations, which was determined electrochemically on an AUTOLAB modular electrochemical system (ECO Chemie) using MWCNTs and ZnO NPs . To prepare the electrode for ACV detection, a carbon paste made of graphite powder (55%), ZnO NPs (5%), MWCNTs (10%), and paraffin oil (30%) was prepared and packed into a plastic syringe. Then, a copper wire was inserted through the paste in the syringe to provide an electrical current . The polymer film-modified MWCNTs-ZnO NPs-CPE was fabricated by cyclic voltammetry in the potential range −0.2 to 0.8 V at a sweep rate of 100 mV/s in 0.5 M aqueous HClO4 solution containing 5 mmol/l o-aminophenol in the presence of 5 mmol/l SDS for 25 cycles. The obtained modified electrode (P-o-aminophenol/MWCNTs-ZnO NPs-CPE) was washed with double-distilled water to remove the physically adsorbed material . The modified electrode was found to significantly improve the quantification process of ACV . Moreover, it was found that the analysis of several other antifungal drugs was enhanced using NPs, like the detection of clotrimazole using Eudragit RS100 nanocapsules by LC-10A HPLC system (Shimadzu, Japan) at 229 nm  and nystatin by using loaded Eudragit RS100/PLGA NPs .
| Thiamine analysis|| |
Gold nanoparticles (AuNPs) have been used as an indicator of thiamine, whihc results in the formation of a secondary peak in the absorbance spectrum of UV–vis spectroscopy using Perkin Elmer Lambda 25 UV/vis spectrometer . Thiamine was purchased from Nutritional Biochemicals Corporation (Cleveland, Ohio, USA), and the AuNPs were prepared using a 1.03 mmol/l solution of HAuCl4 for the purpose of preparation. Three different concentrations of sodium citrate dihydrate were prepared (40 mmol/l, 20 mmol/l, and 10 mmol/l), and then 6 ml of the previously prepared HAuCl4 solution was added to each of the three concentrations, and the three solutions were heated for 5, 15, and 30 min, respectively . The formed AuNPs were used to prepare several solutions with different concentrations. The solutions prepared were typically formed of 10% volume of the previously prepared AuNP solution, 160 and 120 μM of arginine, tryptophan, and L-glutathione amino acids, along with the target thiamine, using ultrapure water as a solvent .
| Celecoxib analysis|| |
Many NSAIDs have been detected using NPs, like celecoxib (obtained from Razi Pharmaceutical Company, Cairo, Egypt), which was determined using iron oxide nanoparticles (magnetic) by Perkin Elmer/Lambda 25 UV–vis spectrophotometer (USA), and chromatography separation was recorded using /diode array detector/column C18 . To prepare the MNPs, diluted ammonia was allowed to react with a mixture of FeCl3.6H2O and FeCl2.4H2O for 150 min under nitrogen at 80°C, until the solution turns black. After that TEOS was added to the solution, which was then kept under stirring for 48 h. After that, the formed NPs were isolated using a strong magnet, and washed with water and ethanol, and then dried under vacuum . After that, iron NPs were modified via refluxing them in 3-mercaptopropyltrimethoxysilane (5%) in toluene for 2 days at 90°C, and the resulting modified NPs can be isolated using a magnet and washed with toluene, and then heated to 40°C under vacuum for drying . After modification of the iron oxide nanoparticles, polymers (like the functional monomer AI, and the thermosensitive polymer NVC) were grafted onto the surface of NPs. This can be done by mixing NVC with AI and the NPs in ethanol, then refluxing the mixture with azobisisobutyronitrile for 7 h under nitrogen at 65°C. After that, the grafted NPs were isolated using a magnet then washed with ethanol, and allowed to dry at room temperature . The polymer-grafted NPs were found to be capable of adsorbing the celecoxib molecules efficiently from samples; thus, these polymers can be used for isolation of celecoxib before its determination using HPLC .
| Indomethacin analysis|| |
Magnetic Fe3O4 NPs have been used for extraction/preconcentration of ultratrace amounts of indomethacin from biological fluids (plasma and urine) before detection by UV-240 Shimadzu spectrophotometer at 310 nm . For this purpose, a mixture of FeCl3.6H2O and FeCl2.4H2O and ammonia solution was allowed to interact together via stirring for 15 min. After discarding the supernatant, the formed iron oxide NPs were washed with deionized water and sodium chloride, and then suspended in deionized water . Measurement of indomethacin using these MNPs was performed by adding CTAB solution to the MNP suspension and adjusting the pH to 10.0, followed by stirring for 5 min, which allows for the CTAB molecules to form a coat on the surface of the MNPs. The MNPs are separated magnetically, and the supernatant is discarded. After that the solution containing the target drug (indomethacin) is subjected to the resulting coated MNPs that absorb the drug molecule on their surfaces. The isolated drug is then available for spectrophotometric detection at 310 nm .
| Cholesterol analysis|| |
On the contrary, nanoparticles can be used for spectrophotometric determination of some vital substances like cholesterol (which was obtained at a concentration of 3.95 U/mg, from Pseudomonas fluorescens). This was achieved by using nanoclay (NCl) in presence of Fe impurity, which acts as the catalyst for reduction of peroxidase at 650 nm . After reaction with TMB in the presence of hydrogen peroxide, peroxidase would produce a characteristic absorption band at 650 nm (measured by Tecan Infinite M200 Pro). However, nanoclay was found to have the ability to simulate the action of peroxidase on TMB, exhibiting a slightly shifted absorption band at 627 nm. The shift can be explained in terms of adsorption of TMB+ on clay . To prepare the electrode for cholesterol detection, nanoclay (NCl) is immersed in a sodium acetate buffer of pH 4.0 for 3 h, then sonicated for 0.5 h to allow for a uniform distribution of the nanoclay in the suspension. Then, the formed suspension was used to cast the previously polished glassy carbon electrode, and the electrode is then allowed to dry at 25°C for 2 h. After that, a solution of cholesterol oxidase was used to cast the NC. After drying the electrode, a layer of poly(3,4-ethylenedioxythiophene) was given and dried overnight. The electrical conductivity and high stability of poly(3,4-ethylenedioxythiophene) makes it suitable as a coat to the electrode, as it would not dissolve in organic solvents, and at the same time prevent the loss of the enzymes from the electrode . Moreover, NC can be used to measure cholesterol amperometrically by applying a potential of −0.5 V, after establishing a constant residual current . Furthermore, cholesterol can be determined using a suspension of NC in acetate buffer (pH 4.0) to which a suitable amount of cholesterol oxidase is added. After that, the cholesterol is added and absorbance measurements are recorded .
| DNA/RNA detection|| |
In the field of protein and gene expression, DNA-mediated gold-silver nanomushroom has been used for simultaneous stable surface-enhanced Raman scattering (SERS) detection of various DNA and RNA targets . Preparation of DNA-modified AuNPs is performed by mixing a solution of AuNPs with a DNA solution, and the mixture is shaken overnight. After that, a sufficient amount of phosphate buffer is added so that the concentration of phosphate in solution becomes 10 mmol/l, with a pH of 7.4. Then the last step is repeated every 1 h for three times using NaNO3, this time to reach a concentration of 0.1 M NaNO3 after the addition of salting buffer (2 M NaNO3). After that, the solution is shaken overnight and then centrifuged at 7500 rpm for 7 min at 4°C. After decantation of the unmodified DNA, the remaining precipitate is resuspended using 10 mmol/l PB solution. These steps are repeated three times . As for the preparation of DNA and Raman molecule comodified AuNPs, a nonfluorescent small molecular Raman report solution is added to the previously prepared DNA-modified AuNPs and allowed to react for 2 h with mild agitation. After that the mixture is washed with 10 mmol/l PB (pH 7.4) and centrifuged at 7500 rpm for 7 min at 4°C to remove the unreacted Raman reporters. After decantation of the wash solution, the precipitated Raman-DNA-modified AuNPs is resuspended with 10 mmol/l PB buffer . After that, and in order to prepare mushroom-like structures, polyvinylpyrrolidone is added followed by sodium ascorbate. Then a solution of AgNO3 is added to the mixture rapidly with vigorous vortexing for 60 s, and then the mixture is allowed to stand for 30 min, and then washed three times with PB, centrifuged at 7500 rpm for 7 min at 4°C, and resuspended with PB buffer . Detection of DNA/RNA targets is performed by modifying MMPs with streptavidin (SA), and after washing, the capture DNA is added. Then 6 μl of biotinylated capture DNA/RNA is added. Then the solution was shaken for 15 min at 25°C. After that the solution is washed with phosphate buffered saline with tween 20 (PBST). After washing, equal volumes of the target DNA/RNA are mixed with MMPs at 37°C for 2 h with gentle shaking. After rewashing the solution, functionalized Au-Ag SERS probes are mixed with the solution and allowed to interact with it for 2 h at 37°C under shaking, to avoid aggregates formation. After incubation, the unreacted SERS probes are removed by washing with PBST. After that, SERS detection is performed using XPLORA (HORIBA; Jobin Yvon, France) Raman microscopic system .
| Protein array detection|| |
ZnS-coated CdSe quantum dot (ZnS/CdSe quantum dots) NP can be used for gene expression, drug screening, and disease detection before fluorescence analysis . To prepare the capture Ab substrate glass, microscope chips were macerated in chrome pickle for 2 h, then washed with water, and dried with nitrogen. After that they were sonicated for 15 min in hexane, acetone, and ethanol and dried at 80°C for 5 min After amino-silanization of the chips’ surfaces, they were rinsed with ethyl acetate and used at once . The amino-modified chips can be covered with IgG via soaking them in 5% glutaraldehyde in phosphate buffer saline for 5 h. After that the chips are rinsed with water and dried with nitrogen stream. Then, the rabbit anti-human antibody is added to the surface dropwise. The drops are allowed to stay in contact with the chips for 2 h at 37°C, and it is then washed with PBS. After that, the unreacted aldehyde groups from the glutaraldehyde are blocked using BSA. After that, a final wash is performed using PBS followed by drying under a stream of argon . The immunoassay readout of the antibody on the glass slide and the calculation of the fluorescence intensity were performed using a GSI Scanner Array 4000 (GSI Lumonics) with two lasers (532 and 635 nm) . The results obtained from this method indicate that the quantum dot-labeled biomolecules, as antigens, can be effectively used in protein chips .
| Streptavidin and immunoglobulin E detection|| |
AgNPs and AgNO3 are used for detection of SA (purchased from Beijing Biosynthesis Biotechnology Co. Ltd, Beijing, China) and human immunoglobulin E (IgE) (obtained from United States Biological, Swampscott, Massachusetts, USA) before analysis by UV–vis spectrophotometer (UV3600; Shimadzu) and spectrofluorometer (RF-5301PC, Shimadzu, Japan) . To prepare the oligo-derived AgNPs (Tag-A), 1 ml of AgNPs with SH-oligomer-Cy5 (75 μl, 10 μM) and SH-oligomer-biotin (25 μl, 10 μM) was incorporated together for at least 18 h. Then the concentration of sodium chloride in the solution was brought up to 0.1 molar using PBS and two molar sodium chloride solutions, and the solution was allowed to stand for 48 h. The conjugate was precipitated via centrifugation for a total of 45 min at 15 000 rpm at 14°C. The resulting precipitate was redispersed in 0.1 M MPBS . As for Tag-B, 1 ml AgNPs with SH-oligomer-Cy3 (75 μl, 10 μM) and SH-oligomer-biotin (25 μl, 10 μM) was incorporated together for at least 18 h, and the same steps performed at tag-A were repeated . Moreover, Tag-C was prepared through incorporating together 1 ml AgNPs with SH-oligomer-Cy5 (75 μl, 10 μM) and aptamer (25 μl, 10 μM) for at least 18 h, and the same steps performed at tag-A were repeated. However, after centrifugation, the resulting precipitate was washed and recentrifuged, and redispersed in 0.1 M PBSM. Tag-C was used for detection of IgE . To detect SA, a modification was performed to a slide using aldehyde, and then a 4×4 microarray was plotted on this slide using 1 mg/ml SA sample and 1 mg/ml BSA (negative control). After that the sample and the negative control were allowed to interact with the slide for 2 h at 37°C, and then the SA was immobilized on the slide via refrigeration. After blocking the slide and washing it with PBST, either Tag-A or Tag-B was allowed to interact with SA for 60 min, then washed with PBST, PBN, and distilled water. Finally, the microarray was scanned after adding FES or silver enhancer solution . The detection of IgE was similar to the aforementioned procedure; a 4×4 microarray was developed on a modified slide, this time using 125 μg/ml anti-human IgE as a sample instead of the SA solution, and the reaction is allowed to continue for 4 h instead of two. After blocking the slide with BSA and washing it with PBST, 30 μl of various concentrations was incubated on the slide for 60 min at 37°C, and then rinsed with PBST. After that, the Tag-C was allowed to interact and bind with IgE for 60 min at 37°C, followed by a washing step. Finally, the microarray was scanned after adding FES . It was found that, this method, which depends largely on a novel silver nanostructure is highly sensitive for protein analysis and can detect concentrations as low as 0.25 ng/ml . Moreover, NPs can be used for determination of a variety of molecules, like anticancer drugs such as gemcitabine, which can be determined by a reversed phase HPLC method using a C18 column and 268 nm UV detection using poly(lactide-coglycolide)/poly-ɛ-caprolactone alginate , and 5-fluorouracil, which can be determined by hydrophilic interaction liquid chromatography/diode array detector using solid lipid NP and nanostructured lipid carrier . Moreover, citrate-capped AuNPs were used for determination of ibuprofen  and opioid drugs such as morphine . Furthermore, morphine, codeine, and methadone have been detected using SDS-coated magnetic Fe3O4 NPs by HPLC-UV detection at 220 nm . Corticosteroid drug halcinonide was detected by HPLC-UV detection at 239 nm using polymeric lipid-core NPs and solid lipid NPs . AgNPs can be used for detection of proteins by UV spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and Fourier transform–Raman spectroscopy . Protein kinase activity also has been determined based on various nanomaterials (NPs, nanowires, NTs, nanorods, nanocomposites and semiconductor quantum dots), using different analytical techniques such as colorimetric sensing, resonance-light-scattering sensing, electrochemical sensing, SERS sensing, mass spectroscopy sensing, and fluorescence sensing .
The use of NPs in the analysis of the different drug can show higher sensitivity than the traditional analytical methods. [Table 1] compared the Lod of NP analytical method and the Lod of traditional analytical method. [Table 2] and [Table 3] show collective data for analyzing different drugs and the used NPs.
|Table 1 Lod of nanoparticles analytical method and Lod of analytical method for different drugs|
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|Table 2 Collective data for analyzing different drugs and the used nanoparticles|
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|Table 3 Collective data for analyzing different drugs and the used nanoparticles|
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| Analytical equipment|| |
The analytical equipment mentioned in this article include UV–vis spectrophotometer which was used in the analysis of the drugs of question using the synthesized NPs depending on the absorption patterns of UV–vis light exhibited by these drugs. UV–vis spectrophotometer which was used in the analysis of L-cysteine , Dexmedetomidine , TC , azithromycin ,, thiamine , indomethacin , cholesterol nanoclay , SA and IgE . Fluorescence spectrophotometer was used as a mean of quantification depending on luminescence exhibited by photons excitation, and fluorescence spectrophotometer was used in the determination of TC . Electrochemical determination was also employed using potentials measured via three electrode-electrochemical (AUTOLAB modular electrochemical systems) systems, and electrochemical systems as well were used in the determination of clozapine , TC , ACV , and cholesterol nanoclay . HPLC was used in the quantification of the drugs in question depending on the principles of chromatography (normal phase or reversed phase) and using a variety of detectors, including photo-diode array, fluorescence spectrophotometer, and UV–vis spectrophotometer. HPLC was used in the determination of OTC , ciprofloxacin , clotrimazole , nystatin , celecoxib , gemcitabine , 5-flourouracil , codeine and methadone , as well as halcinonide . Spectrofluorometer also was used in the determination of various drugs by measuring the florescence exhibited by these molecules after electromagnetic excitation; spectrofluorometer was used in the determination of MF , whereas spectrofluorometer was used in the determination of SA and IgE . Raman microscopic system was used for the detection and determination of DNA and RNA targets depending on the dispersion or scattering of photons at the same energy as the incident photons. Raman microscopic system was used for the detection of DNA and RNA targets .
| Nanoparticle characterization equipment|| |
The equipment for the characterization of the synthesized NPs include vibrating sample magnetometer, which was used for determination of the magnetic properties of the NPs . Moreover, atomic force microscopy experiments were carried out to determine the morphology of the synthesized NPs . Moreover, high-resolution transmission electron microscope and high-resolution digital camera were used for imaging purposes  as well as the determination of morphology and size of the synthesized NPs . Particle size analysis was also performed by dynamic light scattering (using transmission electron microscope) , a laser diffraction particle-size analyzer , or photon correlation spectroscopy ,, whereas zeta potential values were measured via electrophoretic light scattering using the same instrument , using zeta-sizer nano  or zeta potential analyzer . Absolute PL Quantum Yield Spectrometer was used for determining the quantum yields , whereas scanning electron microscopy ,, and transmission electron microscopy , were used for imaging and characterization of the surface structure of synthesized NPs, as well as determination of the size and morphology of the NPs . FTIR spectrometer was used to obtain the FTIR spectrum for the purpose of characterization of the NPs ,. Radiograph diffractometer was used as well for the characterization and determination of the crystal structure of NPs as well as phase characterization of the adsorbent ,,. GSI scanner array was used for quantification of immunoassays with labeled antibodies .
| Conclusion|| |
This review highlighted the new approaches of the involvement of nanotechnology in analyzing different drugs, antibiotics, antivirals, and amino acids, besides it showed that nanotechnology involvement in drug analysis can solve some of the old problems.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]
[Table 1], [Table 2], [Table 3]