In the previous report we conld confirm as the result of our research that the T. T. C. method published by Neal and Calbert was practically applicable to detecting antibiotics contained in milk, and made public a new test procedure for the same purpose in modification of this method.
In this report we tried to determine whether the widely used reagents, methylene blue and resazurine, could replace the conventional one, T. T. C., used in the above-mentioned methods. Judging from our experimental results obtained, it was made clear that the both reagents were usable in replacement of T. T. C. and among them the application of resazurine was less time-consuming and more practical than T. T. C.

抄録全体を表示

(1) 米飯, 蒸し甘しょ, あんの腐敗したもの, 山廃酒母の酸臭を示したもの, 腐造清酒から酸臭の本体を水蒸気蒸留により分離し酢酸であることを認めた.
(2) これらの物質の酸敗する原因はヘテロ乳酸菌の繁殖により酢酸を生ずるによる.
総じて飲食品が腐敗して酸臭を発するのはヘテロ乳酸菌の所為であって酸臭の本体はいつも酢酸である.

抄録全体を表示

We studied on the availavility to artificial Sake of such natural dyes as caramel and melanin as well as synthetic ones and carried out some experiments on their stability and how to use.

抄録全体を表示

(1) P. C. と高圧ロ紙電気泳動法を併用し, 市販 Orange I に付随する副色素として Orange II 以外に 2-p-sulfophenylazo-1-naphthol を分離確認した.
(2) 分光光度測定法により市販 Orange I の副色素部分から前記2種の副色素を同時定量した結果, 大部分の市販品に Orange II とともに 2-p-sulfophenylazo-1-naphthol を含有することを認めたので, Orange I の副色素として Orange II のみを規定するのは不合理であると考える.

抄録全体を表示

We experimented on plastic packaging materials of food to find out whether they were toxic or not. Rats were used in testing the plastic packaging materials and their effect on rats were noted.
Samples were prepared from three kinds of plastic packaging material each of which was boiled for 30 minutes in three different ways given below.
(1) boiling in water (90°C).
(2) boiling in acetic acid (pH 4.0, 90°C).
(3) boiling in lard (90°C).
After boiling the materials were filtered and we used the filtrates as samples.
The samples were mixed with a standard feed (produced dy Oriental Yeast Company) and given to albino rats for 71 or 73 days. During this period the weight or rats, weight of feed eaten and condition of the internal organs were examined.
From these growth tests on the rats no remarkably abnormal changes were noticed. However, as there may be other factors which have an influence on the growth of rats we could not determine whether the plastic packaging materials were toxic or not. Therefore, we would wish to continue research on this problem.

抄録全体を表示