Results 131 to 140 of about 7,153 (198)

Exposure to environmental concentrations of natural pyrethrins induces hepatotoxicity: Assessment in HepG2 cell lines and zebrafish models.

Chemosphere, 2021
Natural pyrethrins are one variety of botanical pesticide, and are commonly used in organic and ecological agriculture. However, the hepatotoxicity of natural pyrethrins is unknown.
Jian Lu, Yun Yang, Lianhua Zhu, Meng Li, Wenping Xu, Cheng Zhang, Jiagao Cheng, Liming Tao, Zhong Li, Yang Zhang   +9 more
semanticscholar   +1 more source

Pyrethrins elicit olfactory response and spatial repellency in Aedes albopictus.

Pest Management Science, 2021
BACKGROUND Pyrethrum from dry flowers of Chrysanthemum is a well-known botanical insecticide and repellent. Its insecticidal activity attributes to its six insecticidal esters, collectively known as pyrethrins.
Ru Yan, Qiao-ling Zhou, Zhanyi Xu, Yuyan Wu, Guonian Zhu, Mengcen Wang, Yirong Guo, K. Dong, Mengli Chen   +8 more
semanticscholar   +1 more source

Residual determination of pyrethrins in Lycium barbarum (goji) by GC-MS/MS and a dietary risk assessment of Chinese goji consumption

Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment, 2020
An accurate and simple analytical approach for the determination of residues cinerin I, cinerin II, jasmolin I, jasmolin II, pyrethrin I and pyrethrin II (six active ingredients of pyrethrins) in fresh and dried goji berries was developed and validated ...
Xinxian Qin, X. Luo, Jiahua Han, Ye Chen, Kankan Zhang, D. Hu   +5 more
semanticscholar   +1 more source

Biosynthesis of the Pyrethrins

Nature, 1961
RECENT work1 has indicated that mevalonic acid (I) is an intermediate in the biosynthesis of terpenoid compounds. We now wish to report some experiments which indicate that this acid is also involved in the biosynthesis of the ‘pyrethrins’, the insecticidal constituents of the pyrethrum plant, Chrysanthemum cinerariaefolium.
M P, CROWLEY, H S, INGLIS, M, SNAREY, E M, THAIN   +3 more
openaire   +2 more sources

Purification of pyrethrins from flowers of Chrysanthemum cineraraeflium by high-speed counter-current chromatography based on coordination reaction with silver nitrate.

Journal of Chromatography A, 2020
Pyrethrum extract is a natural insecticide that has been used worldwide for centuries, with pyrethrins being considered active ingredients. Their purification is difficult due to their chemical structural similarity and instability to light.
Heng Lu, Heng Zhu, Hongjing Dong, Lanping Guo, Tianyu Ma, Xiao Wang   +5 more
semanticscholar   +1 more source

Self-assembled mixed micelle loaded with natural pyrethrins as an intelligent nano-insecticide with a novel temperature-responsive release mode

Chemical Engineering Journal, 2019
Nanotechnology has recently attracted growing interest in the encapsulation of botanical insecticides for sustainable pest control. Biocompatible, biodegradable, and stimuli-responsive devices, however, were scarcely reported in the field of intelligent ...
Yunfei Zhang, Wei Chen, Mengmeng Jing, Shanzhi Liu, Juntao Feng, Hua Wu, Yiwan Zhou, Xing Zhang, Zhiqing Ma   +8 more
semanticscholar   +1 more source

Natural pyrethrins induce cytotoxicity in SH-SY5Y cells and neurotoxicity in zebrafish embryos (Danio rerio).

Environmental Research
Natural pyrethrins are widely used in agriculture because of their good insecticidal activity. Meanwhile, natural pyrethrins play an important role in the safety evaluation of pyrethroids as precursors for structural development of pyrethroid ...
Wei-guo Wang, Shoulin Li, Bin Liu, Ning Tang, Cheng Zhang, Xu-Feng Jiang, Liming Tao, Wenping Xu, Yang Zhang   +8 more
semanticscholar   +1 more source

Action of six pyrethrins purified from the botanical insecticide pyrethrum on cockroach sodium channels expressed in Xenopus oocytes.

Pesticide Biochemistry and Physiology, 2018
Pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmolin I and jasmolin II are six closely related insecticidal active esters, known as pyrethrins, found in the pyrethrum extract from the dry flowers of Tanacetum cinerariifolium.
Mengli Chen, Yuzhe Du, Guonian Zhu, Genki Takamatsu, M. Ihara, K. Matsuda, B. Zhorov, K. Dong   +7 more
semanticscholar   +1 more source

Natural pyrethrins induce autophagy of HepG2 cells through the activation of AMPK/mTOR pathway.

Environmental Pollution, 2018
Natural pyrethrins, one kind of insects' neural toxin, have been used worldwide for the control of pests of crops, livestock, and human beings. However, their specific mechanisms of action are incompletely understood and hence further investigation is ...
Yun Yang, Jufang Gao, Yang Zhang, Wenping Xu, Youwu Hao, Zhiping Xu, Liming Tao   +6 more
semanticscholar   +1 more source

Total Synthesis of some Pyrethrins

Nature, 1948
IN view of recent publications in the United States, it is desirable to record briefly some of the results obtained by us during the past year or so. Following the demonstration by LaForge and Barthel1 of the heterogeneity of ‘pyrethrolone', the alcoholic component of the pyrethrins, and the revision by LaForge and Soloway2 of e structures of the ...
L. CROMBIE, M. ELLIOTT, S. H. HARPER, H. W. B. REED   +3 more
openaire   +2 more sources