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“…Energy intensive. [17] Human hair Alkaline 12.5 g / 100 mL 0.5 N KOH and 0.05 N Ca(OH)2; 20 min at 120 °C. pH adjusted using phosphoric acid.…”
Section: Resultsmentioning
“…It has been reported that this hydrolysate can be used for enhancement of the chlorophyll content and biomass in spinach and wheat plants [16] . Alkaline hydrolysis of hair is used as a source of cysteine as sulphur can be removed from hair in appreciable amounts [17] . Alkaline hydrolysis of hair in the presence of sulphides have shown that it increases the rate of hydrolysis, that the steps involved will be a reaction between hair and sulphide and the reaction between altered hair and hydroxide [18] .…”
Section: Introductionmentioning
“…HOFFMAN and GORTNER (14) found that during the hydrolysis cystine is changed into• an isomeric form, which phosphotungstate was about four times as soluble as that of the original cystine. Thus according to the observations of these authors it seems that cystine, after hydrolysis, cannot be accurately determined by means of phosphotungstic acid.…”
Section: Part V Tile Cystine Content Of Proteinsmentioning
“…Decomposition of cystine also occurs during acid hydrolysis: after 12 hours 5*2 per cent, of cystine could be recovered from wool, after 74 hours only 024 per cent. The observation of Hofmann and Gortner (2), that on boiling cystine with acid a more soluble modification is formed, explains a further source of loss. A reference to a low recovery of cystine-only 60 per cent.-will be found in ' Biochem.…”
mentioning