scholarly journals Advances in the Determination of Anabolic-Androgenic Steroids: From Standard Practices to Tailor-Designed Multidisciplinary Approaches

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 4
Author(s):  
Lukáš Huml ◽  
Jan Tauchen ◽  
Silvie Rimpelová ◽  
Barbora Holubová ◽  
Oldřich Lapčík ◽  
...  

Anabolic-androgenic steroids (AASs), a group of compounds frequently misused by athletes and, unfortunately, also by the general population, have lately attracted global attention; thus, significant demands for more precise, facile, and rapid AAS detection have arisen. The standard methods ordinarily used for AAS determination include liquid and gas chromatography coupled with mass spectrometry. However, good knowledge of steroid metabolism, pretreatment of samples (such as derivatization), and well-trained operators of the instruments are required, making this procedure expensive, complicated, and not routinely applicable. In the drive to meet current AAS detection demands, the scientific focus has shifted to developing novel, tailor-made approaches leading to time- and cost-effective, routine, and field-portable methods for AAS determination in various matrices, such as biological fluids, food supplements, meat, water, or other environmental components. Therefore, herein, we present a comprehensive review article covering recent advances in AAS determination, with a strong emphasis on the increasingly important role of chemically designed artificial sensors, biosensors, and antibody- and fluorescence-based methods.

2017 ◽  
Vol 100 (4) ◽  
pp. 950-961 ◽  
Author(s):  
María Pedrero ◽  
Susana Campuzano ◽  
José M Pingarrón

Abstract The determination of organic and inorganic environmental and food pollutants is a key matter of concern in analytical chemistry due to their effects as a serious threat to human health. Focusing on this issue, several methodologies involving the use of nanostructured electrochemical platforms have been recently reported in the literature. Among these methods, those employing the use of quantum dots (QDs) stand out because of features such as signal amplification, good reproducibility and selectivity, and the possibility for multiplexed detection, and because they preserve the outstanding characteristics of electrochemical methodologies with respect to simplicity, ease-of-use, and cost-effective instrumentation. This review describes recent electrochemical strategies, in which design QDs play a key role, for the determination of pollutants in food and environmental samples. The particular role of QDs in the reported methodologies, their preparation, and the electrochemical platform design, as well as the advantages that QDs provide in the analysis of target analytes, are critically discussed.


2022 ◽  
Vol 4 (1) ◽  
pp. 013-018
Author(s):  
Mohini Chandrashekhar Upadhye ◽  
Mohini Chetan Kuchekar ◽  
Rohini Revansiddhappa Pujari ◽  
Nutan Uttam Sable

Biopolymers are compounds prepared by using various living organisms, including plants. These are composed of repeated units of the same or similar structure (monomers) linked together. Rubber, starch, cellulose, proteins and DNA, RNA, chitin, and peptides are some of the examples of natural biopolymers. Biopolymers are a diverse and remarkably versatile class of materials that are either produced by biological systems or synthesize from biological sources. Biopolymers are used in pharmaceutical industry and also in food industry.Naturally derived polymers are also used for conditioning benefits in hair and skin care. Biopolymers have various applications in medicine, food, packaging, and petroleum industries. This review article is focused on various aspects of biopolymers with a special emphasis on role of biopolymers in green nanotechnology and agriculture.


2017 ◽  
Vol 55 (7) ◽  
pp. 5548-5556 ◽  
Author(s):  
Giuseppe Bertozzi ◽  
Francesco Sessa ◽  
Giuseppe Davide Albano ◽  
Gabriele Sani ◽  
Francesca Maglietta ◽  
...  

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 673
Author(s):  
Heba M. Hashem ◽  
Saad S. M. Hassan ◽  
Ayman H. Kamel ◽  
Abd El-Galil E. Amr ◽  
E. M. AbdelBary

A simple, efficient and reliable analytical method was developed and used for the determination of the fluvoxamine drug (FLV) in pharmaceutical preparations and biological fluids. The method is based on the cost-effective screen-printed platform for the potential transduction of the drug. Host-tailored molecular imprinting polymer (MIP) was integrated with the potentiometric platform as a recognition receptor, in which FLV, acrylamide (AAm), ethylene glycol dimethacrylate (EGDMA) and acetonitrile were used as a template, functional monomer, cross-linker, and solvent, respectively. MIP particles were dispersed in plasticized poly (vinyl chloride) (PVC) and the membrane was drop-casted on carbon screen-printed electrode. The MIP, in addition to non-imprinted polymers (NIP), was characterized and the binding experiment revealed high affinity and adsorption capacity of MIP towards FLV. The proposed sensor displayed near-Nernstian cationic slope of 55.0 ± 0.8 mV/decade (r2 = 0.999) with a low detection limit of 4.8 × 10−6 mol/L over a wide pH range (3.0–8.5). The electrochemical features of the proposed sensors including electrochemical impedance spectroscopy (EIS) and chronopotentiometry measurements (CP) in the presence of multi-walled carbon nanotubes (MWCNTs) as a solid contact transducer were also investigated. The applications of the proposed sensor for the determination of FLV in different dosage forms with recovery values (98.8%–101.9%) and (97.4%–101.1%), respectively compared with the reference HPLC method with acceptedFandt-student tests values at the 95% confidence level.


2021 ◽  
Vol 11 ◽  
Author(s):  
Dharmendra Kumar ◽  
Mogana Rajagopal ◽  
Gabriel Akyirem Akowuah ◽  
Yong-Xin Lee ◽  
Chua Wei Chong ◽  
...  

: Podophyllotoxin is a nonalkaloidtoxin aryltetralin lactone lignan, occurring naturally and extracted from the rhizomes and roots of Podophyllum species. Podophyllotoxin and its derivatives have shown to possess a broad spectrum of pharmacological activities, mainly antineoplastic and antiviral properties. Podophyllotoxin is served as a potential anticancer agent and also the precursor for the chemical synthesis of some clinically important anticancer agents.The chemical modification and pharmacological investigation of podophyllotoxin derivatives have become a concern nowadays. Research interest has been stimulated in the innovation of podophyllotoxin derivatives as the semi-synthetic anticancer agent, especially etoposide and teniposide. Podophyllotoxin and its derivatives are available in several formulations and also found to be effective in combination therapy. This review article aims to provide an overview of the role of podophyllotoxin, its mechanism of action, pharmacological activities, pharmacokinetics, available formulations, and its effects in combination therapy. This article also reviewed the biosynthesis, structure and modifications of podophyllotoxin and its derivatives as an anticancer agent.


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