Extracts of rapeseed meal were reacted with an enzyme active extract of white mustard seed and the liberated acid titrated to give a measure of total glucosinolates. The original rapeseed extracts were examined by thin layer chromatography to identify the glucosinolates and estimate the amounts of 2-hydroxybut-3-enylglucosinolate, but-3-enyfgfucosinolate and pent-4-enylglucosinolate, by comparison with an allylglucosinolate standard.

A method of selective extraction is proposed for the determination of cysteine, ascorbic acid and potassium broniate when present in admixture. Other ingredients and varioiis diluent materials that might be encountered in commercial bread improvers have been shown to caiise negligible interference.Suitable titrimetric methods are recommended for each additive after the extraction procedure has been carried out.

The modifications to a beam balance which are described make possible the differential measurement of the specific gravity of two liquids. In this method oil is extracted from animal feedstuffs with tetrachloroethylene and the change in specific gravity is used as a measure of the oil content of the sample. Results suitable for quality control which are obtained within 20 min are comparable to those obtained in 6 h by the official petroleum extraction method.