Article
Chemistry, Analytical
Yinyin Chen, Xingying She, Wei Wu, Xianxiang Wang
Summary: A dual-mode optical probe for the detection of organophosphorus pesticides triazophos (TRP) was developed based on the internal filter effect (IFE) between upconversion nanoparticles (UCNPs) and gold nanoparticles (AuNPs) in the presence of protamine (PRO) and trypsin (TRY). The probe demonstrated high sensitivity for TRP detection with good linear relationship and low detection limits. The recovery of TRP in real food samples also showed satisfactory results.
MICROCHEMICAL JOURNAL
(2023)
Article
Agriculture, Multidisciplinary
Yang Li, Xiaofei Sun, Lulu Zhou, Li Tian, Keli Zhong, Jinglin Zhang, Xiaomei Yan, Lijun Tang
Summary: In this study, a benzopyran-benzothiazole derivative (probe DCA-Btl) was designed and synthesized to selectively recognize HSO3-/SO32- in food samples. The compound showed both colorimetric and fluorescence response, and had a large Stokes shift, good anti-interference ability, and low cytotoxicity. The results demonstrated that DCA-Btl could effectively detect HSO3-/SO32- in food samples and fluorescently image HSO3- in living cells.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Xiaoling Bao, Jianhong Liu, Qingshu Zheng, Lixin Duan, Yuzhu Zhang, Junlong Qian, Tao Tu
Summary: A colorimetric method utilizing gold nanoparticles for visual detection of melamine in raw milk was developed, with a detection limit as low as 2.4 ppb. The color change from red to blue observed by the naked eye in the presence of trace amount of melamine was attributed to the interaction between the thymine fragment and melamine.
CHINESE CHEMICAL LETTERS
(2021)
Article
Chemistry, Analytical
Zahra Jafar-Nezhad Ivrigh, Arafeh Bigdeli, Somayeh Jafarinejad, Mohammad Reza Hormozi-Nezhad
Summary: In this study, a condition-based single component sensor array was proposed for the quantification and classification of antidepressants. By tuning the pH and ionic strength, the array achieved excellent sensitivity and selectivity in detecting the target analytes. The results of multivariate calibration and classification in human urine demonstrated the practicality of the array in complex biological fluids.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Rui Huang, Mingyuan Wang, Xifeng Chen, Nong Yu, Chenyu Jiang
Summary: A novel colorimetric method for detecting telomerase activity based on the cyclic strand displacement reaction is proposed, which shows good sensitivity and provides a new approach for early cancer diagnosis. The method evaluates telomerase activity by disrupting the protection of gold nanoparticles from salt-induced aggregation.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Food Science & Technology
Marzieh Sepahvand, Forough Ghasemi, Hossein Mir Seyed Hosseini
Summary: This paper discusses the serious threat of irregular and unknowing use of chemical compounds to the environment, human health, and living organisms, emphasizing the importance of monitoring nitrite and nitrate. It comprehensively discusses the application and advantages of nanoplasmonic colorimetric sensors in the measurement of nitrite and nitrate.
FOOD AND CHEMICAL TOXICOLOGY
(2021)
Article
Chemistry, Applied
Zahra Khoshbin, Marzieh Moeenfard, Khalil Abnous, Seyed Mohammad Taghdisi
Summary: A simple aptasensor embedded in a micropipette tip is developed for label-free monitoring of acrylamide. The aptasensor utilizes the formation of a triple-helix molecular switch structure to induce the aggregation of gold nanoparticles. A smartphone imaging readout strategy enables the quantification of acrylamide based on the color change of the solution inside the micropipette tip. This aptasensor shows good selectivity and can successfully quantify acrylamide in various food samples.
Article
Chemistry, Multidisciplinary
Yi Zhou, He-Jia Xu, Xue-Jiao Li, Cheng-Wei Lu, Yue An
Summary: Two fluorescent probes based on coumarin structure were developed for specific detection of bisulfite and hypochlorite, showing high selectivity and sensitivity, with probe L1 successfully applied for monitoring the level of HSO3- in sugar and water samples.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Review
Nanoscience & Nanotechnology
Hui Hun Cho, Do Hyeon Jung, Jun Hyuk Heo, Chae Yeon Lee, Sang Yun Jeong, Jung Heon Lee
Summary: Gold nanoparticles (AuNPs) have been widely used as transducers for colorimetric sensors in environmental and biological applications, especially in the detection of water pollutants. This review provides an overview of the advantages of AuNP-based colorimetric sensors, including low toxicity, high stability, facile processability, and unique optical properties. The review also discusses the current status and future prospects of using AuNP for water pollutant detection, aiming to promote further research and development in this area.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Analytical
Varsha Ushavipinachandran, Susanta Kumar Bhunia
Summary: This study demonstrates the use of different shaped silver nanostructures for sensitive detection of reactive oxygen species (ROS) using simple spectroscopic and colorimetric techniques. The silver nanocubes were particularly efficient in recognizing hypochlorite ions, with detection limits calculated as 36.37 nM. The study also reveals the mechanism of how ROS deteriorates the structural morphologies and optical properties of the nanostructures.
ANALYTICAL METHODS
(2023)
Article
Biochemical Research Methods
Xhensila Shkembi, Mary Luz Botero, Vasso Skouridou, Miriam Jauset-Rubio, Marketa Svobodova, Pablo Ballester, Abdulaziz S. Bashammakh, Mohammad S. El-Shahawi, Abdulrahman O. Alyoubi, Ciara K. O. Sullivan
Summary: The illicit use of AAS as performance-enhancing drugs poses a threat to both competitive sports and public health. Current detection methods are limited to laboratory settings and cannot be performed on-site. However, the development of aptamer technology offers the potential for simple and cost-effective on-site analysis. In this study, a label-free colorimetric assay was developed using aptamers to detect the abuse of AAS.
ANALYTICAL BIOCHEMISTRY
(2022)
Article
Chemistry, Analytical
Joung In Lee, Seok Cheon Jang, Jinhyo Chung, Woong-Ku Choi, Caleb Hong, Geum Ran Ahn, Seong Hwan Kim, Byung Yang Lee, Woo-Jae Chung
Summary: The study presents a simple and rapid colorimetric strategy for detecting Aspergillus niger based on interactions between fungal spores and gold nanoparticles modified with a specific binding peptide. This approach showed high sensitivity and rapid detection time, making it suitable for the detection of large microorganisms using the specificity of ligands and the optical properties of gold nanoparticles.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Sahar Cheraghi Shahi, Mehdi Dadmehr, Behnaz Korouzhdehi, Abolfazl Tavassoli
Summary: A colorimetric competitive assay for detecting AFB1 in foods was developed based on the interaction of AuNPs@gelatin. The method showed a linear detection range of 10 to 140 pg ml(-1), with a detection limit of 4 pg ml(-1) and recoveries percentage of 92.4%-95.3% in real saffron samples. This approach offers a simple, cost effective, and specific method for AFB1 toxin detection in food samples.
Article
Chemistry, Physical
Abhishek Das, Ridhima Chadha, Bhagyashree Chalke, Nandita Maiti
Summary: We report the development of a sensitive colorimetric and Raman turn-off sensor based on gold nanoparticles for the detection of melamine in milk samples. The size and shape of the gold nanoparticles are controlled by the reducing and capping agent gallic acid. The detection limit of the sensor is found to be lower than the recommended limit, making it a potential tool for industrial use.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Biochemistry & Molecular Biology
Le Minh Tu Phan, Sungbo Cho
Summary: Alzheimer's disease (AD), the most common cause of dementia, requires an early and affordable diagnostic tool. In this study, aptamer-mediated biosensors relying on fluorescent and colorimetric assays were developed to rapidly monitor p-tau231. The biosensors demonstrated high sensitivity and potential for global application.
