Enzyme-Linked Immunosorbent Assay for the Pyrethroid Deltamethrin
摘要:
A competitive enzyme-linked immunosorbent assay (ELISA) for the detection of deltamethrin was developed. Two haptens, cyano[3 (4 aminophenoxy)phenyl]methyl 1R cis 3 (2,2-dibromoethenyl) 2,2- dimethylcyclopropanecarboxylate and 3 [(+/-) cyano[1R cis 3 (2,2-dibromoethenyl) 2,2-dimethylcyclopropan ecarbonyloxy]methyl]phenoxyacetic acid, were synthesized and conjugated with thyroglobulin as immunogens. Four antisera were generated and screened against six different coating antigens. The assay that was the most sensitive for deltamethrin was optimized and characterized. The I-50 for deltamethrin was 17.5 +/- 3.6 mug/L, and the lower detection limit was 1.1 +/- 0.5 mug/L. This ELISA assay had relatively low cross reactivities with other major pyrethroids such as permethrin phenothrin, bioresmethrin cyfluthrin, and cypermethrin. Methanol was found to be the best organic cosolvent for this ELISA, with optimal sensitivity observed at a concentration of 40% (v/v). The assay parameters were unchanged at pH values between 5.0 and 8.0 whereas higher ionic strengths strongly suppressed the absorbances. To increase the sensitivity of the overall method, a C-18 sorbent based solid phase extraction was used for river water samples. River water samples fortified with deltamethrin were analyzed according to this method. Good recoveries and correlation with spike levels were observed.
[EN] AMINOPHENYLCYCLOPROPYL CARBOXYLIC ACIDS AND DERIVATIVES AS AGONISTS TO GPR40<br/>[FR] ACIDES AMINOPHENYLCYCLOPROPYLCARBOXYLIQUES ET LEURS DERIVES SERVANT D'AGONISTES DE GPR40
申请人:SMITHKLINE BEECHAM CORP
公开号:WO2005051890A1
公开(公告)日:2005-06-09
The present invention relates generally to novel therapeutic compounds and more particularly to novel compounds, their use as GPR40 agonists, processes for their manufacture, and intermediates useful in their preparation.
Trisubstituted-N-[(1S)-1,2,3,4-tetrahydro-1-naphthalenyl] benzamides which inhibit P2X3 and P2X2/3 containing receptors
申请人:——
公开号:US20020173665A1
公开(公告)日:2002-11-21
Compounds of formula (I)
1
are novel P2X
3
and P2X
2
/P2X
3
antagonists which are useful in treating pain, urinary incontinence and bladder overactivity.
Enzyme-Linked Immunosorbent Assay for the Pyrethroid Permethrin
作者:Guomin Shan、Whitney R Leeman、Donald W. Stoutamire、Shirley J. Gee、Daniel P. Y. Chang、Bruce D. Hammock
DOI:10.1021/jf000351x
日期:2000.9.1
Permethrin is a predominant pyrethroid widely used in agriculture and public health. A competitive enzyme-linked immunosorbent assay (ELISA) for the detection of permethrin was developed. Two haptens, the trans- and cis-isomers of 3-(4-aminophenoxy)benzyl-3-(2, 2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate, were synthesized and conjugated with thyroglobulin as immunogens. Four antisera were
苄氯菊酯是主要用于农业和公共卫生的拟除虫菊酯。开发了一种竞争性酶联免疫吸附测定(ELISA),用于检测氯菊酯。合成了两个半抗原,即3-(4-氨基苯氧基)苄基-3-(2,2-二氯乙烯基)-2,2-二甲基环丙烷羧酸酯的反式和顺式异构体,并与甲状腺球蛋白作为免疫原偶联。产生了四种抗血清,并针对六种不同的包被抗原进行了筛选。所得ELISA的I(50)值为2.50 microg / L,并且与其他主要拟除虫菊酯(如esfenvalerate,氯氰菊酯,溴氰菊酯和氯氟菊酯)的交叉反应性相对较低。发现甲醇是此ELISA的最佳溶剂,在浓度为40%(v / v)时观察到最佳灵敏度。pH值在5.0和8.0之间时,测定参数不变,而较高的离子强度(> 0.2 M PBS)会强烈抑制吸光度。根据该方法分析了用苄氯菊酯强化的河水样品,并通过GC-MS进行了验证。观察到良好的回收率和与峰值水平的相关性,这表明该免疫