最近の機器の発達により重金属の定量にはしばしば原子吸光法が用いられるようになり, 化粧品中の重金属試験にも原子吸光法の応用が検討され始めている。その場合に一番問題となるのは試験溶液の調製法であると思われるので, 初めに試料の灰化方法および微量金属取扱上の問題点などを総説的に述べ, ついで機器による試験法の簡易化の試みとして, 著者らの実験例を説明し参考に供したい。

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Dispersions of stearic acid in an aqueous phase containing polyhydric alcohol, stabilized by sodium and potassium soaps, so-called vanishing cream, have been studied by measuring their flow and creep properties. The stearic acid was a commercially available mixture of the long chain acids of C₁₄, C₁₆, C₁₈ and C₂₀; the polyhydric alcohol was a member of the series glycerin, propylene glycol, etc. All the systems examined showed complex flow properties, e.g., hysteresis loops and spur points in the flow experiments. The creep behavior of all the systems could be represented by a mechanical model composed of a Voigt unit and a Maxwell unit in series. The observed total compliance was markedly dependent on the formulation and the aging time of the systems. However, the retardation time did not change appreciably, indicating that there was no essential difference in the nature of the secondary bonds in the systems, which was break and reform during creep tests. These rheological properties may be explained by the presence of a network structure of the soap micelles in which fatty acid was solubilize partially, in the aqueous phase.

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Purity analysis of petrolatum in lanolin and paraffin in spermaceti was carried out, but satisfactory results was not obtained.
In a recent literature on this purity tests, Tamura et al, at Tokyo-to Laboratories for Medical Science, has reported a TLC method and another method was discribed in J. S. C. I.-1 that the impurities was separated and detected by TLC.
With these methods, a few experiments were performed.
As both methods was differented remarkably, in sample size of the application. The sample size was investigated with detail.
It was confirmed that sufficient sensitivity of detection and good separation with 5μl sample size was obtained.
In addition to, quantitative determination was made good precision by using TLCscanner CS-900. developed TLC directly also when petrolatum and paraffin was contained in samples.

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Antimicrobial activity of Imidazolidinyl urea (IU) is tested in M/10 phosphate buffer solutions against two strains; Escherichia coli and Pseudomonas aeruginosa. The influences of pH, gelatin and collagen hydrolysate on its activity are also tested respectively; the following results are obtained.
Antimicrobial activity of Imidazolidinyl urea (IU) has a tendency to be more effective in alkaline pH range.
Imidazolidinyl urea (IU) is slightly inactivated in the presence of gelatin.
But its activity is more effectively decreased in collagen hydrolysate solution, especially in the case of Pseudomonas aeruginosa. In this collagen hydrolysate solution, the growth of two microbes is less inhibited in alkaline pH range than in acid one.
Weak phototoxity of Imidazolidinyl urea (IU) against Escherichia coli is recognized by irradiation of 290-350nm ray.

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The dithizone method has been used for the determination of trace amounts of lead in raw materials and products for cosmetics. However, in order to determine lead in a safer manner, we studied the application of atomic absorption method such as direct, correction with D₂-lamp, and extraction to the routine work. As a result, it was found that this method can be effective for many kinds of these samples.

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女子大生と化粧品というテーマで, その実態を調査してみた。女子大生は戦後のベビーブームと高度経済成長の中で急増し, 現在では女子大生亡国論まで唱えられるにいたった。将来, 彼女らは職業人として, また結婚して母となり, 一般消費者の中においてもオピニオンリーダーとして重要な役割を演ずるであろう. このような女子大生の学生生活の実態を知り, 化粧と化粧品をどのように考え, 認識しているかを知ることは私たちにとって興味あるものである。今回は標本数が少ないが, 意見のはっきりした大学生であり, さらに薬科大学生であるのでその傾向はつかめると思う。

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昭和49年8月日26より30日まで5日間に亙って, ロンドンにおいて国際化粧品技術者連盟 (IFSCC) の第8回大会が開催され, 日本からも総計58名の会議出席者があった。このうち, 佐藤新一氏 (ライオン歯磨) を団長とし, 関根正巳氏 (日光ケミカルズ) と安福正憲氏 (サンスター歯磨) を副団長とする33名の旅行団に参加する機会を得たので, 大会の模様を中心に, 各地を視察した感想を述べて見たい。
今回で8回目を数えるIFSCCの大会は, 2年おきに世界の各地で開催されることになっており, 1972年ハンブルグ, 1970年バルセロナ, 1968年東京においてそれぞれ盛大に開かれてきた。
今回の会場は, 英国化粧品技術者会の御尽力によって, ロンドン市内ハイドパーク公園に沿った一流ホテルGrosvenor HouseのGreat RoomとBall Roomとを借りきって行なわれ, また8月30日にはロンドン近郊に所在する研究所や工場を見学する1日のツアーが計画された。

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