scholarly journals Factors Affecting the Accurate Quantification of Pesticide Residues in Non-Fatty Matrices

10.5772/13963 ◽  
2011 ◽  
Author(s):  
Panagiotis Georgakopoulos ◽  
Panagiotis Skandamis
Keyword(s):  
Pesticide Residues ◽  
Factors Affecting ◽  
Accurate Quantification

Preliminary Survey of Factors Affecting the Exposure of Harvesters to Pesticide Residues

AIHAJ ◽  
1974 ◽  
Vol 35 (6) ◽  
pp. 374-380 ◽  
Author(s):  
WILLIAM J. POPENDORF ◽  
ROBERT C. SPEAR
Keyword(s):  
Pesticide Residues ◽  
Preliminary Survey ◽  
Factors Affecting

scholarly journals Microbial Degradation of Pesticide Residues and an Emphasis on the Degradation of Cypermethrin and 3-phenoxy Benzoic Acid: A Review

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2313 ◽  
Author(s):  
Yichen Huang ◽  
Lijuan Xiao ◽  
Feiyu Li ◽  
Mengshi Xiao ◽  
Derong Lin ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Microbial Degradation ◽  
Pesticide Residues ◽  
Degradation Process ◽  
Soil Environment ◽  
Natural Conditions ◽  
Factors Affecting ◽  
Degrading Bacteria ◽  
Pyrethroid Pesticides ◽  
Intermediate Metabolite

Nowadays, pesticides are widely used in preventing and controlling the diseases and pests of crop, but at the same time pesticide residues have brought serious harm to human’s health and the environment. It is an important subject to study microbial degradation of pesticides in soil environment in the field of internationally environmental restoration science and technology. This paper summarized the microbial species in the environment, the study of herbicide and pesticides degrading bacteria and the mechanism and application of pesticide microbial degrading bacteria. Cypermethrin and other pyrethroid pesticides were used widely currently, while they were difficult to be degraded in the natural conditions, and an intermediate metabolite, 3-phenoxy benzoic acid would be produced in the degradation process, causing the secondary pollution of agricultural products and a series of problems. Taking it above as an example, the paper paid attention to the degradation process of microorganism under natural conditions and factors affecting the microbial degradation of pesticide. In addition, the developed trend of the research on microbial degradation of pesticide and some obvious problems that need further solution were put forward.

Factors affecting the transfer of organochlorine pesticide residues to breastmilk

Chemosphere ◽  
2001 ◽  
Vol 43 (2) ◽  
pp. 243-256 ◽  
Author(s):  
Caroline A. Harris ◽  
Michael W. Woolridge ◽  
Alastair W.M. Hay
Keyword(s):  
Organochlorine Pesticide ◽  
Pesticide Residues ◽  
Factors Affecting ◽  
Organochlorine Pesticide Residues

Accurate Quantification of Genomic DNA Reference Material of Pathogenic Microorganism Legionella pneumophila by PicoGreen Fluorescence

2013 ◽  
Vol 718-720 ◽  
pp. 261-266
Author(s):  
Ying Ying Liu ◽  
Ya Qian Guan ◽  
Ling Zhang ◽  
Da Zhou Chen ◽  
Jing Wang
Keyword(s):  
Reference Material ◽  
Linear Dependence ◽  
Legionella Pneumophila ◽  
Genomic Dna ◽  
Pathogenic Microorganism ◽  
Factors Affecting ◽  
Fluorescent Signal ◽  
Acid Fragment ◽  
Total Dna ◽  
Accurate Quantification

For the sake of accurate quantification, it was investigated the factors affecting the Picogreen measurement on genomic DNA of legionella pneumophila. As a binding and excitation working manner, PicoGreen fluorescent signal intensity showed to be dependent on incubation time, environmental pH and temperature, nuclear acid fragment length and concentration. Based on the optimized detection conditions, we carried out the methodology investigation including linear dependence, repeatability, LOD and LOQ. From the data, it can be concluded that PicoGreen can be used as a rapid and sensitive candadite characterization method to quantify total DNA of legionella pneumophila.

scholarly journals Modified QuEChERS Extraction and HPLC-MS/MS for Simultaneous Determination of 155 Pesticide Residues in Rice (Oryza sativa L.)

Foods ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 18
Author(s):  
Maria Graça Melo ◽  
Ana Carqueijo ◽  
Andreia Freitas ◽  
Jorge Barbosa ◽  
Ana Sanches Silva
Keyword(s):  
Oryza Sativa ◽  
Pesticide Residues ◽  
High Performance ◽  
Oryza Sativa L ◽  
The European Union ◽  
Limit Of Quantification ◽  
Factors Affecting ◽  
Triple Quadrupole Instrument ◽  
Modified Quechers

Rice (Oryza sativa L.) is the staple food of more than half of the world’s population. The main factors affecting the quality of rice include grain length, texture, stickiness, flavor, and aroma. Pesticides are intended for the protection of plant products from weeds, fungi, or insects. However, pesticides also result in negative effects such as environment disturbances, pest resistance and toxicity to both users and food consumers. The aim of this study was to conduct validation experiments of a method for the determination of multi-pesticides in rice, a model food of other cereals. A quick, easy, cheap, effective, rugged, and safe (QuEChERS) method was used for the extraction of pesticide residues from rice followed by high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) with a triple quadrupole instrument using electrospray ionization. The analytical method has chromatography-tandem according to SANTE/11813/2017. The limit of quantification was 5 μg/kg. Recoveries for the 155 analyzed pesticides ranged between 77.1% for pirimiphos-ethyl and 111.5% for flutriafol and they were determined at 3 spiking levels. The proposed method was demonstrated to be quick, simple, precise, and accurate and allowed for evaluating the compliance of cereals samples with legislated maximum residue levels of pesticides in the European Union.

scholarly journals Determination and dietary risk assessment of 284 pesticide residues in local fruit cultivars in Shanghai, China

2021 ◽  
Author(s):  
Yaodan Zhang ◽  
Wenshuai Si ◽  
Lei Chen ◽  
Guoqing Shen ◽  
Bing Bai ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Pesticide Residues ◽  
Chinese Consumers ◽  
Factors Affecting ◽  
Dietary Risk ◽  
Chinese Consumer ◽  
Exposure Risks ◽  
Ultrahigh Performance Liquid Chromatography ◽  
Dietary Risk Assessment

Abstract The presence of pesticide residues has become one of the main risk factors affecting the safety and quality of agro-food. In this study, a multi-residue method for the analysis of 284 pesticides in five local fruit cultivars in Shanghai was developed based on ultrahigh-performance liquid chromatography-quadrupole time-of-fight mass spectrometry (UPLC-QTOF/MS). The limits of determination and the limits of quantitation of pesticides were 0.6–10 and 2–30 µg/kg, respectively. A total of 44, 10, 10, 18, and 7 pesticides were detected in strawberries, watermelons, melons, peaches, and grapes, respectively. The pesticide levels in 95.0% of the samples were below the maximum residual limits (MRLs) prescribed by China, and in 66.2% of the samples below the EU MRLs. The dietary risk assessment study showed big differences in the chronic and acute exposure risk values among different Chinese consumer groups. Through fruit consumption, children/females showed higher exposure risks than adults/males. But both the risk values were less than 100%, indicating that potential dietary risk induced by the pesticides was not significant for Chinese consumers. Nevertheless, certain measures are needed for both growers and government in order to decrease the MRL-exceeding rate of pesticide residues and ensure the quality and safety of fruits for consumers.

Progress In The Practical Application Of Automated Image Analysis To Tem Negatives

1977 ◽  
Vol 35 ◽  
pp. 214-217
Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly
Keyword(s):  
Image Analysis ◽  
Image Quality ◽  
Exposure Time ◽  
Image Contrast ◽  
Automated Image Analysis ◽  
Practical Application ◽  
Factors Affecting ◽  
High Image Quality ◽  
Qualitative Evidence ◽  
Comprehensive Study

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.

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