原子吸光分析法による多数試料の果汁かん詰の溶出スズの迅速定量法について検討した. その結果, 果汁に塩酸を加え, 37°の恒温器に60分以上放置したのち, そのろ液を直接測定する方法で良好な回収率および再現性があることがわかり, ポーラログラフ法との相関係数=0.856で非常に高い相関関係がえられた. 測定はバーナーにヘテコバーナーを用い, 燃料も取り扱いが簡単で経済的な水素-空気系を用いることで十分測定できることが判明した. また試料を灰化しなくとも定量できうるところからも迅速で簡単に溶出スズの管理に採用できることが判明した.

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The preservability of Vienna sausage, using the legally approved synthetic germicide 2- (2-furyl) -3- (5-nitro-2-furyl) -acrylamide (AF-2) and the preservative sorbic acid (SOA) was studied using laboratory produced samples. Results obtained were as follows.
1. Tests for the presence or absence of Neto development, organoleptic tests, measurement of the numbers and species of bacteria developing at 10°C and 30°C and pH measurement revealed that preservability decreased according to the order of addition of pH depressing agent→addition of AF-2·SOA→addition of SOA→addition of AF-2→no addition. The highest degree preservability was achieved in samples coated with AF-2+SOA+pH depressing agent where the optimal pH was 5.9. However, considerable variation was noted in preservability among various samples of the same lot. Periods of maximal preservability also differed more than 10 days.
2. The effect of addition of the synthetic germicide, (2- (2-Furyl) -3- (5-nitro-2-furyl) -acrylamide), and a preservative (sorbic acid) manifested itself at the optimal pH and cold temperatures. The maximal effect was obtained when the fundamental aspects of hygienic handling from production to sales were fulfilled. The actual preservation results were noted to be the total sum of all additives and handling procedures.
3. The bacterial flora was definitely different between those samples containing the synthetic germicide plus preservative and those without additions. While lactobacilli were predominant in the former; micrococci, corynebacteria and lactobacilli were predominant in the latter. Alcaligenes species appeared and increased with elongated preservation times.

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Creatine was dissolved in an aqueous extract solution prepared from whale meat and mixed with a small portion of a homogenate of whale meat. After adjustment or without adjustment of the initial pH of the mixture, aerobic and anaerobic decompositions of creatine in the resulting mixtures were surveyed by means of a paper chromatographic technique, with special reference to the formation of 3-methylhydantoic acid and 1-methylhy-dantoin.
3-Methylhydantoic acid which was thought to be a possible intermediate of the creatine decomposition was not detected in every case. The formation of 1-methylhydantoin was observed only when a mixture, of which the initial pH had been adjusted to 7.3, was incubated under anaerobic conditions. A great quantity of 1-methylhydantoin suddenly appeared in the mixture after 3 days of incubation at 30°C. A marked decrease in quantity of this substance was observed already on the next day, and only acid a trace amount was found in the mixture after 8 days of incubation.

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合成食酢より分離した糸状菌をMoniliella acetoabutans Stolk et Dakinと同定し, 分離株および標準株について糖の発酵性, 資化性, 硝酸塩の資化性などを検討した. さらにこれらMoniliella属糸状菌と他の糸状菌の生育限界pH, 酢酸の資化性および酢酸耐性についても調べ, Moniliella属の食品衛生上の問題について考察を加えた.

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Sodium cyclamate, which had been forbidden to use as food additive to any kinds of foods, was separated from other food components by ultrafiltration and determined by colorimeteric method.
It has been reported that sodium cyclamate reacts with nitrite and turns into cyclohexyl nitrite.
In this report, the experimental condition for the colorimetric determination of the cyclohexyl nitrite was examined. Sulfanilamide and N-1-naphthylethylenediamine dihydrochloride were used as the reagents. The colored solution was determined at about 555mμ. of wave length Ultrafiltration method was found to be very effective for preparing the test solution, and the prepared test solution could be used for esterification directly without dilution, the solution not being emulsified with organic solvent on extraction procedure.
In the recovery test of cyclamate on food, the recovery ratio was about 90%.
The minimum limit concentrations of detectable sodium cyclamate were 50ppm in juice and was 500ppm in the other foods.

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More than two kinds of the preservatives are used frequently, in the market foodstuffs. In this paper, the separating determination method for the preservatives by use of the column of the strongly basic ion-exchange resin (DOWEX 2X8-Cl^- form) was described. As the eluents, the hydrochloric acid mixed with methanol of the various concentrations were used selectively. The results obtained from the experiments are as follows:
1) For seven examples of the mixtures of preservatives, the separating methods of their ingredients were accomplished.
2) The interference of the other substances such as the decomposed products from sugar, vanillin and ethyl vanillin, could be romoved from the preservatives.

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The separating determination method of the preservatives by use of the column of DOWEX 2X8-Action (strongly basic ion-exchange resin) was studied. As the eluents, the acetic acid mixed with methanol of the various concentrations were used selectively. The results obtained from the experiments are as follows:
1) For eight examples of the mixed preservatives, the favourable separating conditions of their ingredients have been accomplished.
2) It was unsuitable to employ the column of DOWEX 2X8-Cl^- form for the purpose of separating dehydroacetic acid and sorbic acid or butyl p-hydroxy benzoate and benzoic acid, but these mixture of the preservatives could be separated easily by use of the column of DOWEX 2X8-Ac^- form
3) The interference by the decomposed product from sugar, vanillin and ethyl vanillin could be entirely removed from the preservatives.

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Results are reported for the determination of drin-pesticides in 132 samples of the nine kinds of vegetables, cucumbers, tomatoes, eggplants, potatoes, sweet potatoes, carrots, cabbages, chinese cabbages and lettuces which were purchased at markets in Tokyo, Osaka and Kochi during the period from June to August, 1970.
There are two findings presented by this result. First, 46 of 85 samples of cucumbers, potatoes, sweet potatoes and carrots were contaminated by dieldrin and/or endrin of above 0.01ppm, and the maximum found in dieldrin was 0.29ppm and that in endrin was 0.55ppm. Second, it is suspected that these contamination of most vegetables by dieldrin resulted from soils contaminated by aldrin. Translocation of pesticide into cucumbers grown in soils containing dieldrin is also discussed.

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