Detail of "1523-11-1"

Reference

Substrate specificities and multiple forms of esterases in the brown planthopper, Nilaparvata lugens (Stal)

Substrate specificities and multiple forms of esterases in the brown planthopper, Nilaparvata lugens (Stal). Chang, C. K.; Whalon, M. E. (Pestic. Res. Cent., Michigan State Univ., East Lansing, MI 48824, USA). Pestic. Biochem. Physiol., 27(1), 30-5 (English) 1987. CODEN: PCBPBS. ISSN: 0048-3575. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) Section cross-reference(s): 7, 12 Esterase [9013-79-0] substrate specificities were examd. in body homogenates of the brown planthopper (Nilaparvata lugens) using a-naphthyl acetate [830-81-9], b-naphthyl acetate [1523-11-1], trans-permethrin [61949-77-7], cis-permethrin [61949-76-6], malathion [121-75-5], and fenvalerate [51630-58-1] as substrates. Eight esterases were resolved from body homogenates of the brown planthopper with pI values in the range of 4.3-5.3 and designated as E1-E8. All E1-E8 hydrolyzed a-naphthyl acetate, b-naphthyl acetate, cis-permethrin, trans-permethrin, and malathion at different rates. Fenvalerate was the most stable substrate to hydrolysis and was hydrolyzed by E1-E8 except E3.

Hexamethyldisiloxane as a mobile phase component for normal phase liquid chromatography

Hexamethyldisiloxane as a mobile phase component for normal phase liquid chromatography. Danielson, N. D.; Goldhammer, C. L.; Bowser, J. R.; Gavin, P. F. ( Department Chemistry, Miami University, Oxford, OH 45056, USA). Chromatographia, 43(11/12), 647-653 (English) 1996 Vieweg. CODEN: CHRGB7. ISSN: 0009-5893. DOCUMENT TYPE: Journal CA Section: 80 (Organic Analytical Chemistry) Hexamethyldisiloxane (I) was evaluated as a modifier solvent for the normal phase sepn.Several reagents with their cas registry numbers 1523-11-1 and 634-93-5 are used here. of substituted naphthalene compds. as well as aroms. such as nitrobenzene, acetophenone, benzonitrile, and aniline. It is found to be a weaker eluting solvent than Bu ether and other commonly used normal phase solvents filling a niche in the eluotropic series. The solvent I exhibited an unusual retention factor (k') profile as a function of mobile phase compn. in hexane. In a range from 0-40%, the k' values remained quite const. with increasing I compn. As the concn. of I progressed to 100%, the k' values actually increased in a generally linear fashion. This trend in k' is due to longer solute retention not just a change in the retention time of the unretained component. Although slight silanization of the silica column may occur with initial use of I, retention of these analytes on a com. C-1 silica column is much lower with no pos. k' slope with increasing I. The chromatog. data provide evidence that I is likely adsorbed to the silica surface and a solute partitioning mechanism may be operative. .