STUDIES ON THE METHOD FOR TESTING THE SPOILAGE OF FOOD-XIV:ON NATURE OF VOLATILE REDUCING SUBSTANCES (VRS) DETERMINED BY STROHECKER METHOD

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TOMIYAMA and IKEURA2) made it clear that both basic and neutral substances are involved in VRS value obtained by their method1). The present paper deals with how much VRS and whether basic or neutral VRS can be oxidized by the STROHECKER method3) which employs an acidic solution of permanganate as contrasted to an alkaline solution in the TOMIYAMA et al's method1). A study has also been carried out of the efficiency of ion-exchanger in separating basic VRS from neutral one. Data presented in Tables 1 and 2 indicate that only free basic VRS can be adsorbed quantitatively on Amberlite IRC-50 and that the salt of basic VRS shall be separated with Dowex 50. Data given in Table 4 show that the extent of oxidation of both neutral and basic VRS according to the STROHECKER's procedure3) is relatively small when compared with that by the TOMIYAMA et al's method1). It is noted that a modified STROHECKER's procedure proposed by TOMIYASU et al4) gives a comparable value with that by the original procedure in case of the neutral substances, while higher value in case of the basic ones.
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