scholarly journals Cost-Effective Tween 80-Capped Copper Nanoparticles for Ultrasensitive Colorimetric Detection of Thiram Pesticide in Environmental Water Samples

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Nguyen Tuan Anh ◽  
Ngo Xuan Dinh ◽  
Hoang Van Tuan ◽  
Tran Hung Thuan ◽  
Le Minh Tung ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Water Samples ◽  
Limit Of Detection ◽  
Colorimetric Detection ◽  
Critical Role ◽  
Tween 80 ◽  
Cost Effective ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Colorimetric Probe

Thiram plays a critical role in protecting fruits and vegetables from damage by various crop diseases, but its residues significantly affect the environment, such as soil and water pollution, and becoming a serious threat to human health. Herein, Tween 80-capped copper nanoparticles (Tween 80-CuNPs) were developed as a convenient and low-cost colorimetric probe for selective detection of thiram pesticide. In the presence of thiram, the color of Tween 80-capped CuNPs changed from dark brown to olive green and colorless at high thiram concentrations. The Tween 80-capped CuNPs-based colorimetric probe exhibited good selectivity and high sensitivity (LOD about 0.17 μM) with a high linearity level in the calibration range of 0.5–25 μM of thiram concentrations. The thiram limit of detection (LOD) of proposed sensor is lower than the maximum residue limit (MRL) regulated by the governments of EU and Vietnam. Moreover, the proposed sensor was successfully applied to determine thiram in tap water with percentage recovery of 98-107% and high repeatability ( RSD = 1.9 % ). The obtained results indicated that Tween 80-capped CuNPs would become a cost-effective sensing platform for ultrahigh-sensitive thiram determination in the environmental water samples.

A simple colorimetric analytical assay using gold nanoparticles for specific detection of tetracycline in environmental water samples

2018 ◽  
Vol 10 (27) ◽  
pp. 3402-3407 ◽  
Author(s):  
Mengyu Qi ◽  
Chunyan Tu ◽  
Yuanyuan Dai ◽  
Weiping Wang ◽  
Aijun Wang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Water Samples ◽  
Colorimetric Method ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Specific Detection ◽  
Colorimetric Probe ◽  
Analytical Assay

In this work, an aptamer-based colorimetric method for the detection of tetracycline (TC) was established by employing gold nanoparticles (AuNPs) as the colorimetric probe.

Improving Mycobacterium spp. detection in water: a new methodological proposal

2004 ◽  
Vol 4 (2) ◽  
pp. 103-106
Author(s):  
R. Santos ◽  
S. Gonçalves ◽  
F. Macieira ◽  
F. Oliveira ◽  
R. Rodrigues ◽  
...  
Keyword(s):  
Water Samples ◽  
Recovery Rate ◽  
Opportunistic Infections ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Sample Treatment ◽  
Detection Time ◽  
Fast Detection ◽  
Enrichment Step ◽  
Mycobacterium Spp

In recent years, non-tuberculous mycobacteria (NTM), once considered merely environmental saprophytes, have emerged as a major cause of opportunistic infections. There is no evidence of human-to-human transmission but they have been found in several environmental water samples. It is, therefore, of the utmost importance to develop methods of rapidly and accurately detecting non-tuberculous mycobacteria in water samples. To obtain a maximum recovery rate and a reduction of Mycobacterium spp. detection time in water samples, different decontamination, enrichment procedures and antibiotics supplements were tested before the inoculation into the Bactec® system. The proposed method of sample treatment (decrease in the decontamination time, followed for a peptone pre-enrichment step and an aztreonam and cefepime supplement) before the inoculation into the Bactec® system proved to be a good option for reliable and fast detection of Mycobacterium spp. in water samples.

The Occurrence of Male-Specific and Somatic Bacteriophages in Polluted South African Waters

1991 ◽  
Vol 24 (2) ◽  
pp. 251-254 ◽  
Author(s):  
R. Kfir ◽  
P. Coubrough ◽  
W. O. K. Grabow
Keyword(s):  
South African ◽  
Water Samples ◽  
Biological Treatment ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Resistance Pattern ◽  
Male Specific

The occurrence of somatic (F') and male-specific (F') coliphages and Salmonella phages in a variety of environmental water samples was studied using different bacterial hosts. The number of plaque-forming units (pfu) of the different bacteriophages were compared and their resistance pattern to a biological treatment (humus tank) and chlorination was evaluated. The presence of the bacteriophages in shellfish was also studied. The morphology of isolate bacteriophages was examined as well as the visibility of the different plaques formed. Coliphages were found to produce larger and clearer plaques than all other bacteriophages studied. In most of the environmental water samples coliphages outnumbered all other bacteriophages, with the exception of dam water in which higher levels of F' Salmonella phages were detected. The majority of the F' Salmonella phages were shown to be RNA bacteriophages.

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