Recent development of an electrochemical imprinted sensor for the detection of trace-level of unmetabolized aflatoxin B2 in dairy milk

2020 ◽  
Vol 865 ◽  
pp. 114123
Author(s):  
Nadia El Alami El Hassani ◽  
Benachir Bouchikhi ◽  
Nezha El Bari
Keyword(s):  
Trace Level ◽  
Aflatoxin B2 ◽  
Dairy Milk

Trace-level screening of dichlorophenols in processed dairy milk by headspace gas chromatography

2016 ◽  
Vol 39 (20) ◽  
pp. 3957-3963 ◽  
Author(s):  
Kaelyn Gras ◽  
Jim Luong ◽  
Ronda Gras ◽  
Robert A. Shellie
Keyword(s):  
Gas Chromatography ◽  
Headspace Gas Chromatography ◽  
Trace Level ◽  
Headspace Gas ◽  
Dairy Milk

A Comprehensive Review on Perchlorate Chemistry

2021 ◽  
Vol 30 (1) ◽  
pp. 18-31
Author(s):  
Swati Chandrawanshi ◽  
Manas Kanti Deb ◽  
Ramsingh Kurrey
Keyword(s):  
Environmental Protection Agency ◽  
Sodium Iodide ◽  
Chemical Processes ◽  
Sodium Iodide Symporter ◽  
Protection Agency ◽  
Iodide Uptake ◽  
Trace Level ◽  
Dairy Milk ◽  
Different Sources

Perchlorate anion (ClO4-) has been found in environmental and biological systems such as ground water, surface water, soil, fruit, dairy milk, breast milk, plant tissues, beverages, urine and blood etc. High amount of perchlorate leads to toxicity by inhibiting the iodide uptake in sodium-iodide symporter (NIS) protein system; therefore thyroid hormones can’t be synthesized.The permissible limit of perchlorate in drinking water is 15ng/mL proposed by United States Environmental Protection Agency (USEPA). It is measured in environmental and biological matrices by applying various techniques. This paper reviews the sources, toxicity, different techniques applied in estimation of perchlorate and its remediation. Different sources of perchlorate in environment and its toxicity has been discussed. For the removal of perchlorate many biological and chemical processes have been applied. This paper also highlights traditional and novel techniques employed for trace level determination of perchlorate in different matrices. The various merits and demerits of instrumental techniques employed have also been discussed.

Analysis of Trace Level Perchlorate in Drinking Water and Ground Water by Electrospray Mass Spectrometry

1998 ◽  
Author(s):  
Rebecca A. Clewell ◽  
Wayne T. Brashear ◽  
David T. Tsui ◽  
Sanwat Chaudhuri ◽  
Rachel S. Cassady
Keyword(s):  
Mass Spectrometry ◽  
Drinking Water ◽  
Ground Water ◽  
Electrospray Mass Spectrometry ◽  
Trace Level

Anatase porous titania nanosheets for resonant-gravimetric detection of ppb-level NO2 at room-temperature

The Analyst ◽  
2021 ◽  
Author(s):  
Jialin Yang ◽  
Ding Wang ◽  
Ming Li ◽  
Haitao Yu ◽  
Pengcheng Xu ◽  
...  
Keyword(s):  
Public Health ◽  
Environmental Protection ◽  
Room Temperature ◽  
Trace Level ◽  
Porous Titania

The trace-level detection to harmful NO2 gas at room-temperature is very important for environmental protection and public health. This paper reports the resonant-gravimetric detection of ppb-level NO2 at room-temperature using...

Mercury speciation at trace level using fluorescein hydrazide as fluorescent probe

2021 ◽  
Author(s):  
Kempahanumakkagaari Sureshkumar ◽  
Thippeswamy Ramakrishnappa ◽  
Malingappa Pandurangappa
Keyword(s):  
Fluorescent Probe ◽  
Mercury Speciation ◽  
Trace Level

scholarly journals Occurrence of mycotoxins in selected agricultural and commercial products available in eastern Poland

2021 ◽  
Vol 19 (1) ◽  
pp. 653-664
Author(s):  
Grażyna Kowalska ◽  
Radosław Kowalski
Keyword(s):  
Ochratoxin A ◽  
Aflatoxin B1 ◽  
Extraction Method ◽  
Maximum Allowable Concentration ◽  
Commercial Products ◽  
Ms Analysis ◽  
Rye Flour ◽  
Three Samples ◽  
Aflatoxin B2

Abstract The objective of this study was the estimation of the content of 13 mycotoxins (diacetoxyscirpenol, T-2 toxin, HT-2 toxin, nivalenol, deoxynivalenol, 3-acetyldeoxynivalenol, fusarenone X, aflatoxin B1, aflatoxin B2, aflatoxin G1, aflatoxin G2, ochratoxin A, and zearalenone) in various products from the eastern part of Poland. The content of mycotoxins in the analysed samples was assayed using the extraction method combined with HPLC-MS/MS analysis. We found mycotoxins in 25 of the 92 samples tested (27%). Contamination with mycotoxins was noted most frequently in samples of cereals – 56% – and also in samples of flour and cocoa, in which a content of mycotoxins was noted in 24 and 16% of the samples, respectively. The most frequently identified were the following – deoxynivalenol detected in 18 samples (72%), zearalenone detected in eight samples (32%), toxin HT-2 detected in four samples (16%), ochratoxin A identified in three samples (12%), and toxin T-2 detected in one sample (4%). In one analysed sample of mixed flour and in one analysed sample of wheat and rye flour, the maximum allowable concentration was exceeded in the case of two identified mycotoxins – deoxynivalenol (2,250 μg/kg) and ochratoxin A (15.6 and 17.1 μg/kg).

scholarly journals A Flexible PI/Si/SiO2 Piezoresistive Microcantilever for Trace-Level Detection of Aflatoxin B1

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1118
Author(s):  
Yuan Tian ◽  
Yi Liu ◽  
Yang Wang ◽  
Jia Xu ◽  
Xiaomei Yu
Keyword(s):  
Single Crystal ◽  
Aflatoxin B1 ◽  
Single Crystal Silicon ◽  
Silicon Layer ◽  
Wheatstone Bridge ◽  
Silicon On Insulator ◽  
Passivation Layer ◽  
Spring Constant ◽  
Trace Level ◽  
Crystal Silicon

In this paper, a polyimide (PI)/Si/SiO2-based piezoresistive microcantilever biosensor was developed to achieve a trace level detection for aflatoxin B1. To take advantage of both the high piezoresistance coefficient of single-crystal silicon and the small spring constant of PI, the flexible piezoresistive microcantilever was designed using the buried oxide (BOX) layer of a silicon-on-insulator (SOI) wafer as a bottom passivation layer, the topmost single-crystal silicon layer as a piezoresistor layer, and a thin PI film as a top passivation layer. To obtain higher sensitivity and output voltage stability, four identical piezoresistors, two of which were located in the substrate and two integrated in the microcantilevers, were composed of a quarter-bridge configuration wheatstone bridge. The fabricated PI/Si/SiO2 microcantilever showed good mechanical properties with a spring constant of 21.31 nN/μm and a deflection sensitivity of 3.54 × 10−7 nm−1. The microcantilever biosensor also showed a stable voltage output in the Phosphate Buffered Saline (PBS) buffer with a fluctuation less than 1 μV @ 3 V. By functionalizing anti-aflatoxin B1 on the sensing piezoresistive microcantilever with a biotin avidin system (BAS), a linear aflatoxin B1 detection concentration resulting from 1 ng/mL to 100 ng/mL was obtained, and the toxic molecule detection also showed good specificity. The experimental results indicate that the PI/Si/SiO2 flexible piezoresistive microcantilever biosensor has excellent abilities in trace-level and specific detections of aflatoxin B1 and other biomolecules.

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