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Volume 21, Issue 1
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[in Japanese]1963 Volume 21 Issue 1 Pages 1-2
Published: January 30, 1963
Released on J-STAGE: October 29, 2010
JOURNAL FREE ACCESSDownload PDF (2333K) -
Haruo Baba1963 Volume 21 Issue 1 Pages 3-7
Published: January 30, 1963
Released on J-STAGE: October 29, 2010
JOURNAL FREE ACCESSIn previous report, it was observed that relative biopotency of vitamin A in fish liver oil differs due to the sample, namely in some samples vitamin A has almost same value with all-trans vitamin A, and in others it has 70% of relative biopotency of all-trans. These differences of relative biopotency due to sample liver oil were considered due to isomerization of vitamin A in fish liver oil.
From the above consideration, factors of isomarization of vitamin A in fish liver oil were researched. Degree of isomarization of vitamin A was measured by maleic value.
The results are as follows.
1) Isomarization by heat treatment was not remarkable. Heating of 150°C was not effective. Heating of 240°C resulted 50% isomarization by 30 minutes treatments.
2) The effect of liver tissue on isomarization of vitamin A was remarkable whether it was heated before incubation or not. Comparing rate of isomarization, tissue treatment was about 5 times of without tissue.
3) The proteinous materials had almost no effect, glucose and water also showing the same result, but rat blood and EDTA had effect to isomarization of vitamin A.
4) The effect of storage about 2 months on isomarization of vitamin A in purified fish liver oil was not remarkable.
From these results, it was considered that freshness of liver as raw material of vitamin oil and purity of liver oil as raw material of distilled oil are nescessary for making vitamin A oil having high relative biopotency.View full abstractDownload PDF (5822K) -
Haruo Baba1963 Volume 21 Issue 1 Pages 8-13
Published: January 30, 1963
Released on J-STAGE: October 29, 2010
JOURNAL FREE ACCESSFrom the results of bio-test of albino rat, it is considered that biopotency of vitamin A in fish liver oil is not different from all-trans vitamin A. But only when isomarization of vitamin A in sample is serious, its growth effect is less than all-trans vitamin A.
To examine these results on chick, various administrations of vitamin A in fish liver oil was conducted and the following results were obtained.
1) Growth effect of vitamin A in fish liver oil was not different comparing to all-trans vitamin A.
2) When administering amounts of NRC requirement or a half, fish liver resources was rather superior to synthetic resources.
3) Feed efficiency ratio and PER of vitamin A in fish liver oil group were superior in most cases.
4) Superior growth effect was not recognized significantly at administration of dose over the NRC.
5) Superiority of vitamin A in fish liver oil was considered due to containing “fish liver oil factor”View full abstractDownload PDF (6799K) -
Nobuo Matsuno, Ayako Nishihara1963 Volume 21 Issue 1 Pages 14-17
Published: January 30, 1963
Released on J-STAGE: October 29, 2010
JOURNAL FREE ACCESSProtein score of the ingested foods by Japanese people may sometimes be different according to the kinds and amounts of the foods intaken at a meal or a day.
To clarify this, an evaluation of Protein score was made on each meal and each day from the results of the nutrition survey, and the variations among meals or a day's intake was observed.
According to the result, in all cases investigated, there was a considerable variation of Protein score among breakfast, lunch and supper, and a diurnal variation was also remarkable.View full abstractDownload PDF (3794K)
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