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Volume 30 (1989)
- Issue 6 Pages 479-
- Issue 5 Pages 351-
- Issue 4 Pages 281-
- Issue 3 Pages 199-
- Issue 2 Pages 123-
- Issue 1 Pages 1-
Volume 30, Issue 4
Displaying 1-8 of 8 articles from this issue
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Tamao NOGUCHI, Osamu ARAKAWA, Kanehisa HASHIMOTO1989 Volume 30 Issue 4 Pages 281-288
Published: August 05, 1989
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSDownload PDF (880K) -
Hideaki YAMANAKA, Kuniyoshi SHIMAKURA, Kazuo SHIOMI, Takeaki KIKUCHI, ...1989 Volume 30 Issue 4 Pages 289-294_1
Published: August 05, 1989
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSChanges in polyamine contents and viable counts of total bacteria were examined in the meats of common squid and scallop with and without the addition of chloramphenicol during storage at 10°C. In the common squid and scallop meats without chloramphenicol, the levels of agmatine, putrescine and cadaverine increased remarkably as decomposition proceeded. These polyamines appear to be useful as potential indicators of the freshness and decomposition of common squid and scallop. In the meats added with chloramphenicol, viable counts increased slowly and polyamines were produced in very small amounts. From these results it was concluded that polyamines were produced from amino acids by bacterial decarboxylases and not by endogenous muscle enzymes. When viable counts of total bacteria reached the level of 103/g in common squid and 103/g to 104/g in scallop, the formation of polyamines was observed. Alteromonas putrefaciens produced putrescine, cadaverine, agmatine and tryptamine.View full abstractDownload PDF (641K) -
Studies on Anti-Allergic Activity in Tea. IYumie MAEDA, Masatoshi YAMAMOTO, Toshio MASUI, Kiyoshi SUGIYAMA, Masam ...1989 Volume 30 Issue 4 Pages 295-299_1
Published: August 05, 1989
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSThe inhibitory effects of hot water extracts of eight kinds of tea on histamine release from rat peritoneal mast cells were investigated in vitro. All of the extracts tested showed significant inhibitory effects on histamine release from mast cells induced by antigen as well as by compound 48/80.
The results of a preliminary study on the active principles in the extracts suggested that phenolic components were responsible for the inhibitory activities of the extracts.View full abstractDownload PDF (576K) -
Hajimu ISHIWATA, Takiko SUGITA, Kunitoshi YOSHIHIRA1989 Volume 30 Issue 4 Pages 300-305_1
Published: August 05, 1989
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSTwo official analytical methods specified in the Japanese Food Sanitation Law for the determination of phenol released from food container-packages and utensils were compared. One method involves turbidimetry using bromine, and this is applied to formaldehyde resins such as phenol, urea and melamine resins. The other is colorimetry using 4-aminoantipyrine, a method applied to rubber products and cans coated with synthetic resin. In the former method, the percentage of positive visual detection of precipitate formation increased in a sigmoid manner with respect to the concentration of phenol. One hundred percent detection rate was attained at more than 25ppm phenol. Melamine, which might exist in the test solution prepared from melamine-formaldehyde resin, was also found to form a precipitate at only 10ppm upon addition of bromine. The latter method, colorimetry, showed a linear calibration curve, y=0.0273x+0.025, r=0.999, where y is optical density, x is the concentration of phenol (ppm) and r is the correlation coefficient, and was not affected by the coexistence of formaldehyde, urea or melamine up to 100ppm. The colorimetry was confirmed to be better than the turbidimetry by applying both methods to migration solutions prepared from phenol resin products.View full abstractDownload PDF (747K) -
Chiaki MURAKAMI, Takenori MARUYAMA, Isao NIIYA1989 Volume 30 Issue 4 Pages 306-313_1
Published: August 05, 1989
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSA sensitive method was developed for the quantitative determination of sucrose mono-and di-fatty acid esters (SuE) in foods by high performance liquid chromatography (HPLC). The SuE were extracted with tetrahydrofuran from foods and purified by silica gel column chromatography. The isolated SuE were derivatized with 3, 5-dinitrobenzoyl chloride (DNBC) and the reaction products were dissolved in a mixture of tetrahydrofuran and acetonitrile (1:1). A portion of this solution was injected into an Inertsil C8 column and eluted with a linear gradient elution system from 15% water in acetonitrile to 100% acetonitrile over 30min, then hold for 20min.
Each SuE was detected with a UV detector set at 230nm. SuE in various kinds of foods could be selectively detected without interference on the HPLC. All peaks of mono-and diesters having C12, C14, C16, C18 C16-C16, C16-C18 and C18-C18 carbon chains could be well separated. The recoveries of SuE added to margarine, ice cream, cookies, curry roux and coffee whitener were more than 80% for the monoesters and more than 75% for the diesters. The detection limit was 0.001% for each SuE.View full abstractDownload PDF (742K) -
Makiko YAMADA, Koh MURAI, Mikio NAKAMURA1989 Volume 30 Issue 4 Pages 314-320_1
Published: August 05, 1989
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSTitanium trichloride titration is employed as the official method of determination of coal-tar dyes permitted under the Japanese Food Sanitation Law. The method was modified to allow the use of automatic photometric titration. The major wavelength of the interference filter corresponded with the specific color of each coal-tar dye. The injection droplet volume, the time interval between an injection and the next injection and the temperature during titration were decided as 30μl, 3sec and 70°C, respectively.
When determination of Brilliant Blue FCF by the presented method was carried out repeatedly, the standard deviation was 0.31 and the coefficient of variation was 0.34%. In the determination of Fast Green FCF and Acid Red, the coefficients of variation were 0.19-0.34%.
When the determination of four Azo colors and Indigo Carmine by photometric titration were carried out, the standard deviation was 0.08-0.28 and the coefficient of variation was 0.09-0.33%.
The method presented here is simple, rapid and accurate, and should be useful for the determination of food coal-tar dyes.View full abstractDownload PDF (572K) -
Tsugio BABA, Seiji SASAKI1989 Volume 30 Issue 4 Pages 321-323_1
Published: August 05, 1989
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSA simple and rapid determination method of dibutyltin compounds and tricresyl phosphate (TCP) contained in polyvinyl chloride (PVC) by thin layer chromatography (TLC) was developed. Contents of dibutyltin compounds and TCP in PVC are limited to lower than 50ppm and 1, 000ppm, respectively, by the Food Sanitation Law of Japan.
Standard determination methods of these compounds involve such difficulties as timeconsuming pretreatment for gas chromatographic analysis, or indistinct spot formation on paper chromatography.
Test solution for the proposed method was prepared as follows; 0.2g of PVC sample was dissolved in tetrahydrofuran (THF), and the polymer was precipitated by adding ethanol at 10 times the THE volume. The filtrate was evaporated to dryness, and the residue was taken up in 1ml of ethanol, and divided into halves. One half was used for the analysis of dibutyltin compounds, and the other for the analysis of TCP, after hydrolysis with potassium hydroxide. Detection limits of this method for dibutyltin dichloride and TCP were 50ng and 250ng, respectively.View full abstractDownload PDF (370K) -
Keito BOKI, Masumi HASEGAWA, Shinsaku OHNO1989 Volume 30 Issue 4 Pages 324-327_1
Published: August 05, 1989
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSA methyl orange adsorption method was developed to estimate the content of kudzu starch in commercial kudzu starch products mixed with sweet potato starch. Suitable conditions for adsorption of methyl orange on kudzu starch and kudzu-sweet potato starch mixture were as follows: adsorption time, 30min; concentration of methyl orange solution, 0.020%. A good correlation between the amount of methyl orange adsorbed on kudzu starch and kudzu-sweet potato starch mixture and the content of kudzu starch in kudzu and sweet potato starch mixture was found (correlation coefficient, -0.9980). The methyl orange adsorption method could be used to estimate the content of kudzu starch in commercial kudzu starch product.View full abstractDownload PDF (366K)
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