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Volume 39 (1998)
- Issue 6 Pages 345-
- Issue 5 Pages 297-
- Issue 4 Pages 241-
- Issue 3 Pages 165-
- Issue 2 Pages 61-
- Issue 1 Pages 1-
Volume 39, Issue 3
Displaying 1-11 of 11 articles from this issue
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Susumu HIRANO, Tomoko SHIMADA, Tsuruzo SHIMA1998 Volume 39 Issue 3 Pages 165-171_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSThe efficacy of typical sorting methods which have been practically employed in industry for excluding aflatoxin-contaminated materials from peanuts was evaluated by determining aflatoxin concentration in the peanuts before and after sorting treatments. The efficacy of aflatoxin removal from panuets varied from almost 0 to 100% depending on the methods used.
The aflatoxin concentration in peanuts was most effectively reduced by the manual exclusion of deteriorated peanuts, such as moldy or worm-eaten nuts, based on visual inspection. The effective removal of aflatoxin by using a color sorter required precise tuning of the operating conditions. Sifting and air-fan sorting had no significant effect.
In some cases, these sorting procedures, even in combined use, could not reduce the aflatoxin concentration in peanuts to below 10ppb, which is the legal concentration limit under Japanese customs regulations.View full abstractDownload PDF (766K) -
Hirotaka OBANA, Masahiro OKIHASHI, Mikiya KITAGAWA, Shinjiro HORI, Hir ...1998 Volume 39 Issue 3 Pages 172-177_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSOrganophosphorus pesticide residues in foods were extracted by means of supercritical fluid extraction (SFE). The extracted pesticides were determined consecutively by GC-FPD detection under the control of a computer. Samples were mixed with two kinds of drying agents, diatomaceous earth or a super-absorbent polymer, before extraction to remove water. Thirty-three out of 35 pesticides tested were extracted with good recovery and determined with high precision, though acephate and methamidophos were hardly recovered when diatomaceous earth was used and poorly recovered with the super-absorbent polymer. Most interfering substances, such as fats and green food colors, were not extracted during the proposed extraction process.
These results suggest that extraction by SFE coupled with selective detection is suitable for the analysis of pesticide residues in foods.View full abstractDownload PDF (858K) -
Yuiko TAKEDA, Yoko KAWAMURA, Takashi YAMADA1998 Volume 39 Issue 3 Pages 178-183_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSThe dissolution of aluminium from aluminium foil in food-simulating solvents was investigated. The dissolution was affected by conditions such as solvent, temperature and time. The dissolution of aluminium in water was very low, but that in acidic solvents was extremely high. It increased in the order of ultrapure water<tap water<0.5% citric acid<4% acetic acid at a fixed temperature and time. The dissolution of aluminium in acidic solvents was 25 to 200 times higher than that in tap water, and depended on temperature and time.
Aluminium was rapidly dissolved in an alkaline solvent within 2 hours, but later, the dissolution reached an equilibrium state.
A dissolution test of 10 kinds of aluminium foil products was carried out with each solvent for 30 min at 95°C. The dissolution level was 0.1-0.2μg/cm2 in ultrapure water, 4.4-14.6μg/cm2 in 0.5% citric acid and 24.4-37.6μg/cm2 in 4% acetic acid.View full abstractDownload PDF (739K) -
Kimihiko YOSHII, Yasuhide TONOGAI, Yukari TSUMURA, Yumiko NAKAMURA, Ta ...1998 Volume 39 Issue 3 Pages 184-191_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSA method for simultaneous determination of 15 pesticides in cereals by HPLC with UV and FL detection was developed. The pesticides were extracted by SFE, defatted with Extrelut®+Sep-Pak® C18 and cleaned up with a Sep-Pak® Florisil cartridge. Pesticides were eluted from the cartridge with mixtures of 15 and 50% ether-n-hexane and 50% acetone-n-hexane.
Extrelut® 3 was directly connected to the exhaust port of SFE to charge the extract. The amount of lipid extracted by SFE was smaller than that in the case of solvent extraction with acetone or acetonitrile. The large amount of lipid in the case of corn was further decreased by gel permeation chromatography (GPC) after Extrelut® 3. Separation of the Sep-Pak® Florisil eluate into three fractions was effective in providing a clue to the kinds of pesticide contained in the sample.View full abstractDownload PDF (955K) -
Kyoji YOSHINO, Takanobu GOTO, Hisashi KURIBAYASHI, Mayuko TAMURA, Mits ...1998 Volume 39 Issue 3 Pages 192-198_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSThe antioxidative and hypolipidemic effects of green tea polyphenols (TP) in mice fed a fish oil-supplemented diet were investigated. Male ddY mice of 8 weeks old were given the following diets for 21 days: control diet (a diet supplemented with 5.0% corn oil), a diet with 0.5% corn oil and 4.5% cod liver oil, or a diet with 0.5% corn oil, 4.5% cod liver oil, and 0.5% TP. The contents of n-3 polyunsaturated fatty acids in the liver of mice given the fish oil plus TP diet were significantly higher than those in the group given the fish oil-only diet. The hypolipidemic effect of fish oil was enhanced by additional administration of TP. Administration of the fish oil-supplemented diet with TP inhibited the increase of lipid peroxide levels caused by fish oil in the liver and serum of mice. The decrease of vitamin E content in the biological samples caused by fish oil feeding was also suppressed by additional TP administration. Thus, addition of 0.5% TP to the fish oil-supplemented diet has significant hypolipidemic and antioxidative effects in mice.View full abstractDownload PDF (892K) -
Yoko KAWAMURA, Maiko KAWAMURA, Yuiko TAKEDA, Takashi YAMADA1998 Volume 39 Issue 3 Pages 199-205_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSStyrene dimers and trimers in polystyrene were extracted with cyclohexane-2-propanol (1:1) and determined by GC-FID. The analyzed samples were disposable cups, food cases, bowls, trays, cases of yogurt and tofu, and cups of instant noodles, chow mein, spaghetti, etc. All samples contained the dimers and trimers and residue levels were 90-1, 030μg/g (average 380μg/g) and 650-20, 770μg/g (average 9, 210μg/g), respectively. The cyclotrimer, 1-phenyl-4-(1′-phenylethyl) tetralin, accounted for about two-thirds of the residues. The migration test with food simulated-solvents was carried out using three types of polystyrenes containing about 10, 000μg/g of dimers and trimers. High-impact polystyrene released larger amounts of dimers and trimers than general-purpose polystyrene and the migration levels into n-heptane were 44.8μg/cm2 and 0.38μg/cm2, respectively.View full abstractDownload PDF (743K) -
Yoko KAWAMURA, Yuki KOYANO, Yuiko TAKEDA, Takashi YAMADA1998 Volume 39 Issue 3 Pages 206-212_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSThe migration of bisphenol A from food contact polycarbonate products was investigated by HPLC with a quantitation limit of 0.5ppb. The migration was affected by the test conditions and it increased in the order of water and 4% acetic acid at 60°C, 30min<20% ethanol at 60°C, 30min<water and 4% acetic acid at 95°C, 30min<n-heptane at 25°C, 60min. It decreased sharply after repeated use or when the products were boiled before the tests. Four contravened samples contained 379-599ppm of bisphenol A, but the migration was under 40ppb. Ten commercial products, e. g., infant's tableware, nursing bottles and a measuring cup, contained 5-80ppm and migration was found from only 3 samples at under 5ppb. The migrations of phenol and p-tert-butylphenol from the same samples were also investigated.View full abstractDownload PDF (863K) -
Yoko YASUI1998 Volume 39 Issue 3 Pages 213-217_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSAn analytical method was developed for allyl isothiocyanate (allyl NCS) on shredded vegetables. The sample was extracted with acetonitrile, filtered through a 0.45μm filter, then subjected to HPLC with a mobile phase of acetonitrile-water-0.2mol/L sodium phosphate buffer (65:30:5, pH 5.5). Detection was achieved with a UV monitor set at 244nm. The recoveries from cabbage fortified with allyl NCS at levels of 2μg/g and 10μg/g were 90.7% and 89.4%, respectively. A total of 56 vegetables (23 kinds) from 20 packages were analyzed. Allyl NCS from natural was detected at 55.6μg/g in Mustard packed in “Baby Leaf Salad”.View full abstractDownload PDF (461K) -
Masako ITO, Toshihiro NAGAYAMA, Maki KOBAYASHI, Tsuneo HASHIMOTO, Naho ...1998 Volume 39 Issue 3 Pages 218-224_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSA simplified determination procedure for alanycarb in agricultural products by high performance liquid chromatography with a UV detector was developed.
The homogenate of agricultural products was extracted with acetone. The crude extract was partitioned between 10% sodium chloride solution and ethyl acetate, and the ethyl acetate layer was evaporated to dryness. The residue was dissolved in n-hexane, and the solution was cleaned up on a Bond Elute® extraction cartridge PSA, then analyzed by liquid chromatography. Alanycarb was detected by measuring the absorbance at 230nm.
Recoveries at the 0. 1ppm level were more than 70% from agricultural products except brown rice. Detection limits for the products were 0.01ppm in samples.View full abstractDownload PDF (758K) -
Yasuhiro TAMURA, Toshihiro NAGAYAMA, Maki KOBAYASHI, Tsuneo HASHIMOTO, ...1998 Volume 39 Issue 3 Pages 225-232_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESSA method for accurate and simple determination of 28 kinds of organonitrogen and 7 kinds of carbamate pesticides in foods was developed. The pesticides in foods were extracted using a method for rapid simultaneous determination of pesticide residues recommended by the Ministry of Health and Welfare. The pesticides co-injected with retention index standards (M-Series) were determined with a dual-column gas chromatograph equipped with ATD. The identification was based on retention indices and the quantitation was done by a multi-internal standard method. This technique provides superior reproducibility of identification and accuracy of quantitation.View full abstractDownload PDF (914K) -
Maki KOBAYASHI, Toshihiro NAGAYAMA, Tsuneo HASHIMOTO, Nahoko HANEISHI, ...1998 Volume 39 Issue 3 Pages 233-239_1
Published: June 05, 1998
Released on J-STAGE: December 11, 2009
JOURNAL FREE ACCESS
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