𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The determination of the pyrethrins in pyrethrum concentrates in mineral oil

✍ Scribed by Martin, I. T. ;Brightwell, S. T. P.

Publisher
Wiley (John Wiley & Sons)
Year
1946
Weight
536 KB
Volume
65
Category
Article
ISSN
0368-4075

No coin nor oath required. For personal study only.

✦ Synopsis

A mctliocl is clcscribrcl for tlic detcrniinotion of pyrctlirin I in pyrctlirum coiieciitriitcs in light tint1 liriivy niincrnl oils. Tlic nietliod is bnard 111mii tlmt of \Vileoson IIH modified IIY Holiidiry nnd utilises the scpiir;ition of elirysnnt liciiiiiin inonoc~irboxylic acid on11 t lie recluctioii of Ikmigbs' reagent. Jlodificntions of the \'ilcoson-Holnday method concerned with tlic initial renioviil of uncomliiiiccl ncids, the removnl of tlie oil nnd the aelmntion of the nioiiornrbosylic acid Inivc been introd~iccd. Tlic dctcrininntion of the n~onoriirbosylic iirid by tlic reduction of Denigbs' reagent gives rcaiilts for pyrctlirin I slightly in excctm of those given by n modifial Soil iiictliotl invulviiig ~iyiirntion of tlic monocnrboxylic iicitl by atcum distil-Intion. l'yretlirin I1 may LK. detcrniinrd in oil ~olutions mude from ~~etroleiini etlier extrcictn of ~iyrctlirum [lowers by a11 npplicntion of tlic Seil nicthod. Furthcr work in required on the dctermirintion of pyrethrin 11 in oil solutions macle from acetone extracts of the [lowers.

πŸ“œ SIMILAR VOLUMES

The determination of the pyrethrin conte
The determination of the pyrethrin content of dilute preparations of pyrethrum flowers in oil
✍ Bray, G. T. ;Lord, K. A. πŸ“‚ Article πŸ“… 1946 πŸ› Wiley (John Wiley & Sons) βš– 365 KB

## Abstract The Martin‐Brightwell modification of the Wileoxon‐Holaday mercury reduction method, which was drawn up for the evaluation of pyrethrum preparation in mineral oil containing o% of total pyrethrums, have been critically examined and modified to give accurate results for dilute preparatio