All methods for the estimation of aflatoxin M~ in milk involve extraction with organic solvents. In some methods, fresh milk or reconstituted powder is shaken with a suitable extractant so as to precipitate proteins and extract the toxin simultaneously, while in others a separate protein precipitant is used. In no method is protein precipitation complete, however, and at the extraction stage th...

"Substituent on benzenesulfonyl group" effect of 8-benzenesulfonamidoquinoline [N-(8-quinolyl)benzenesulfonamide, Hbsq] as bidentate chelate extractant for divalent metal cations was investigated with using Hbsq and its eight derivatives. Introduction of electron-withdrawing substituent on the benzenesulfonyl group in Hbsq enhanced the extractability that originated from its inductive effect. F...

Over the last three decades, there has been a resurgence of interest in large-scale production of fermentation chemicals due to the sharp increase in petroleum cost. So the potential role of a new energy efficient fermentation technology is receiving growing attention. Propionic acid is widely used in the food, pharmaceutical and chemical industries. Fermentation technology for the production o...