WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-16
·
IF 2.9
Hua Li,Zhao Danyang,Wang Huining,Wei Ting
Shaanxi is an important agricultural province in China. The rapid development of agriculture has led to an increase in the use of pesticides, which has resulted in a serious pesticide pollution problem. In addition, assessing the total residue concentrations would overestimate the actual hazard of neonicotinoid pesticides, so it is essential to study the bioavailability of neonicotinoid pesticides. In the study, 115 soil samples collected from different areas from northern, central, and southern Shaanxi were used to determine the residues of four neonicotinoid pesticides: imidacloprid, acetamiprid, clothianidin, and thiamethoxam. An analytical method applied to assess the bioavailability of neonicotinoid pesticides was established, the bioavailability of different types of neonicotinoid pesticides and related factors affecting their bioavailability were determined, and the changes in the bioavailability of neonicotinoid pesticides in actual and simulated soils were explored. The results showed that the detection rates and residue levels of neonicotinoid pesticides varied in different regions of Shaanxi. By studying the bioavailability of neonicotinoid pesticides, it was found that the bioavailability of the four neonicotinoid pesticides was always: thiamethoxam > acetamiprid > imidacloprid > clothianidin, which may be related to their structural properties. Soil pH is positively related to the size of the bioavailability of neonicotinoid pesticides, while soil organic matter content and soil aging time are negatively related to the size of the bioavailability of neonicotinoid pesticides.
研究领域:
环境科学
·
农业科学
·
毒理学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2024
·Vol. 24
·期 7
·2713-2723
·
IF 2.8
Hua Li,Dang Fanglin,Yu Lumengfei,Zhao Hui,Wei Ting,An Fengqiu
Purpose This study aimed to investigate the residual levels of representative organophosphorus and pyrethroid pesticides (chlorpyrifos, cypermethrin, deltamethrin, and lambda-cyhalothrin) in agricultural soils and crops in Shaanxi Province, and to reveal their accumulation characteristics and regional distribution characteristics in crops. Materials and methods The study was conducted using 115 soils and crops samples from typical agricultural areas in Shaanxi Province. The pesticide residues were measured using gas chromatography-mass spectrometry (GC-MS). The crops were analyzed based on the residue characteristics of fruits, vegetables, and field crops. Additionally, the pesticide residues in crops from the Guanzhong area (central part of Shaanxi), northern Shaanxi, and southern Shaanxi regions were analyzed. A correlation analysis was conducted to examine the influencing factors of pesticide residues in soil-crops, considering the physical and chemical properties of the soil in Shaanxi Province. Results and discussion The results indicate that there are differences in the detection rates and residual concentrations of different pesticides in soil. In the Guanzhong area, the pesticide residual levels in crops follow the trend of chlorpyrifos > deltamethrin > lambda-cyhalothrin > cypermethrin, with relatively high pesticide residues found in corn. In northern Shaanxi, the overall pesticide residual levels in crops show a trend of chlorpyrifos > deltamethrin > cypermethrin > lambda-cyhalothrin. In southern Shaanxi, all the pesticides were detected to varying degrees in crops, with chlorpyrifos showing the highest residual levels. Conclusions All four pesticides were detected in the soils of the study area and the enrichment capacity of different crops varied greatly. Pesticide enrichment is not only affected by temperature and climate conditions in different regions, but soil organic matter, pH, and CEC also have a significant effect on the enrichment of pesticides by crops.
研究领域:
环境科学
·
农业科学
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产品关联
DOI
高影响因子
Frontiers in Microbiology
·
2022
·
IF 6.064
Liu Chen,Xue Wen-jiao,Ding Hao,An Chao,Ma Sai-jian,Liu Yao
The objective of this study was to assess in vitro probiotic potential of Lactobacillus strains derived from artisanal fermented vegetables in Shaanxi, China. In total, 74 acid-producing Gram-positive strains with rod-shaped under the microscope were isolated from 16 samples of spontaneously fermented vegetables. Out of 74 strains, 26 showed high survival rate under low pH and high bile salts conditions and were subjected to molecular identification by 16S rRNA gene sequencing analysis. The results showed that 15 isolates belonged to Lactobacillus plantarum, 9 isolates belonged to Lactobacillus brevis, and the 2 remaining strains belonged to Weissella viridescens. The 24 Lactobacillus strains were investigated for their survival rate to transit simulated gastrointestinal tract, cell surface hydrophobicity, auto-aggregation, co-aggregation with pathogen, adhesion to Caco-2, antimicrobial activity, antibiotics susceptibility, radical scavenging ability, α-glucosidase inhibition, and the cholesterol assimilation. The results showed that the probiotic characteristics were strain-dependent, and several strains exhibited great probiotic potential with specific health benefits, which indicated that they might be excellent candidates for production of functional foods. Interestingly, it was first found that L. plantarum generally had higher antibacterial activities, α-glucosidase inhibition ability, and antibiotics susceptibility compared to L. brevis in this study. The results indicated that Lactobacillus strains isolated from fermented vegetables in Shaanxi, China, could be exploited as a promising novel probiotic source.
研究领域:
微生物学
·
食品科学
·
营养学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）