Journal . d cause an increase in the contentof soluble organic nitrogen compounds in themust ; alcohol and monopotassium phosphatereduce the soluble nitrogenous constituents. Theoptimum temperature of the reaction is about35° C. ; at 45° C. it ceases. Must protease dis-appears during fermentation ; its function is topromote the decomposition of proteins ^yhich areunattacked by the cells of the ferment.—E. H. T. Ebidlioscope ; A new for the determiiiafion of alcohol in wine. P. Malvezin. Bull. Sucr., 1915, 32, 104—108. In the apparatus illus-trated, which is claimedto obviate source
Journal . d cause an increase in the contentof soluble organic nitrogen compounds in themust ; alcohol and monopotassium phosphatereduce the soluble nitrogenous constituents. Theoptimum temperature of the reaction is about35° C. ; at 45° C. it ceases. Must protease dis-appears during fermentation ; its function is topromote the decomposition of proteins ^yhich areunattacked by the cells of the ferment.—E. H. T. Ebidlioscope ; A new for the determiiiafion of alcohol in wine. P. Malvezin. Bull. Sucr., 1915, 32, 104—108. In the apparatus illus-trated, which is claimedto obviate sources oferror, notably thosearising from the pres-ence of a high per-centage of dry extract,the wine is containedin the vessel, B, whichis surrounded by thewater-bath. A, the latterbeing heated by thelamp. L, at the elbow,K. By obser\ing thethermometers, E andE, and referring toa table compiled fromactual determinationsmade with wines ofaverage composition,the content of alcohol isascertained.—J. P. Hydrocyanic acid and benzaldehyde ; Determinationof —?— in Kirsch liqueur. J. Golse. J. , 1915, 12, 44— French official method for the determinationof hydrocyanic acid and benzaldehyde in liqueursis stated to be untrustworthy, the chief objectionsbeing the insufficient quantity of alkali used tofix the hydrocyanic acid during the distillation ofthe aldehyde and the ^vrong conditions underwhich the latter is precipitated as its phenyl-hydrazone. The following procedure is recom-mended : 200 of the liqueur is treated with1 of sodium hydroxide solution (sp. gr. 1-32—1-36) in a 600 flask, and the mixture is distilleduntil 175 of distillate has been collected (A).The residual liquid in the flask is then cooled,50 of 10% sulphuric acid is added slowlythrough a tapped funnel, and the mixture againdistilled. 50 of distillate being collected in areceiver containing 5 of ammonia (B). Thedistillate {A) is now transferred to a
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
