Gadung (Dioscorea hispida Dennst.) has been considered as one of staple foods in Indonesia. However, its high cyanides content has limited its utilisation for commercial food production. This work is aimed to investigate the removal of cyanides content from gadung tuber chips through two consecutive treatments, i.e. leaching and steaming and to propose mathematics model for the leaching process...

The conditions of coulom9tric bromometric determination of cyanides in weak alkaline medium of the borate buffer solution are described. I t is possible to titrate free cyanides and the cyanides linked coordinately in Cr(CN*)jp and Cr(CN)6N0 ~. The equivalence point of titration is indicated biamperometrically. The presence of air oxygen influences the results of free cyanide determination. The...

Total phenols were determined by molecular spectmphotometry, after distillation, complexation with Caminoantipyrine and extraction into chloroform. Cyanides were also determined spectrophotometrically after distillation from the acidified samples, and complexation in moderate acidic solution with barbituric acid. The dynamic ranges were 0 100 pg L-' for total phenols and 0 30 pg L-' for cyanide...

Z. Naturforsch. 45a, 353-356 (1990); received August 25, 1989 The 1 N nuclear quadrupole resonance (NQR) of the cyanides in Ba[Fe(CN)sNO] • 3 H 2 0 (BNP) was observed between 77 and 293 K. Phase transitions exist at 118,131 (both weakly first order) and 233 K (second order). Most of the cyanides were perturbed by the structural changes except for one of the trans cyanides that was only affected...

A5 A PRELIMINARY to the detection and determination of cyanides in biologic materials, a separation by steam distillation is generally employed (1, 2). This may be carried out either in the presence of dilute acid or sodium bicarbonate. It has been stated that the former gives no distinction between the more and the less toxic of the cyanides and that the latter may be unreliable in this respec...

The toxicity, physiologic effects, and antidotes are the points emphasized in the existing literature on the cyanides; Giacosa and Baumann alone have been interested in their fate in the body. Reports are unanimous that the aliphatic cyanides split off hydrocyanic acid, and that toxicity is directly proportional to the rate at which this splitting occurs, while an increase in the excretion of t...

Lewis acid-catalyzed dimerization of mono- and disaccharidic per-O-acetylated glycals gave di- and tetrasaccharidic O-acetylated C-glycosides, respectively. 2,3-Enopyranosyl cyanides were obtained from per-O-acetylated glycals by a new, mild anomeric S(N)'-acetoxy displacement with Hg(CN)(2)/HgBr(2)/TMSCN. Per-O-acetylated 2-C-2-deoxy-pyranoses were converted into pyranosyl cyanides by the same...