Food Preservation Science
Online ISSN : 2186-1277
Print ISSN : 1344-1213
ISSN-L : 1344-1213
Volume 41, Issue 3
Displaying 1-4 of 4 articles from this issue
  • Takamitsu NATORI, Yuko NAKAGAWA, Hikaru SAKURABAYASHI, Satoru FUKUI, S ...
    2015 Volume 41 Issue 3 Pages 91-102
    Published: 2015
    Released on J-STAGE: August 14, 2022
    JOURNAL FREE ACCESS

     Many edible wild plants have been consumed as food. It has been reported that these plants have antioxidants, antitumor and antibacterial activities. First, we examined the DPPH radical scavenging activity and total polyphenol contents in 14 species of edible wild plants, which were collected from the Yamanashi prefecture. A significant correlation between antioxidant activity and polyphenol content was observed. Moreover, Akebia quinata, Pteridium aquilinum, Adenophora triphylla, Cacalia delphiniifolia, Allium victorialis, Hosta sieboldiana, Vinca minor and Acer maximowiczianum were found to have significant antitumor effects against C6 glioma cells. The decrease of cell viability raises two possibilities-induction of cell death or growth retardation. We then subjected the extracts to propidium iodide (PI) and calcein-AM staining to distinguish between dead and live cells, respectively. The extracts from A. maximowiczianuminduced an increase in the number of PI-positive cells. Moreover, activation of caspase 3 and translocation of phosphatidylserine were observed in the extract-treated cells suggesting that apoptosis might be the reason for decreased cell viability. On the other hand, extracts of A. victorialis, H. sieboldiana, and V. minor induced abnormalities in the cell cycle in the G2/M phase of cell cycle. Our data suggest that the antitumor effect of the edible wild plants might be through the induction of apoptosis and cell cycle abnormalities.

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  • Andi DIRPAN, Yoshio HIKIDA, Hironori CHIBA, Yukiharu OGAWA
    2015 Volume 41 Issue 3 Pages 103-110
    Published: 2015
    Released on J-STAGE: August 14, 2022
    JOURNAL FREE ACCESS

     The aim of the present study is to determine the intercellular space volume (Vin) of citrus fruits and to develop a simple prediction method for Vin. In determining Vin, the mass (m), vertical and horizontal diameters (vd, hd), total volume (Vt), and real density (Pt) of eight species of citrus fruits of different sizes were measured. The results showed that each species had various Vin, which depended on fruit size; in other words, the larger the size of the fruit, the larger the Vin. However, the levels of porosity (Ø) in each species were not fully proportional to fruit size. The model used to develop the simple prediction method for Vin (Vin=Vt-m/1.0647, where Vin and Vt are in cubic centimeters and m is in grams), exhibited a high determination coefficient (R2=0.999), modeling efficiency (EF = 0.999), index of agreement (d = 0.999), and paired t-test value (0.365). It was concluded that the model is suitable for predicting Vin of citrus fruits.

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  • Norihiro YAMADA, Nobuhiro NAGASHIMA, Hitomi SHIGAKI, Takahiro INAKUMA
    2015 Volume 41 Issue 3 Pages 111-115
    Published: 2015
    Released on J-STAGE: August 14, 2022
    JOURNAL FREE ACCESS

     Milk gels were prepared by incubating a mixture of milk and ginger juice at different temperatures and incubation times. This was done to determine the effects of variation in temperature and incubation time on the hardness, adhesiveness, and cohesiveness of milk gels. Our results demonstrated that it was favorable to incubate the mixture for 30 minutes at 60-70℃, after mixing the milk and ginger juice by stirring. The hardness increased with additional heating to 80℃ after gel formation using ginger protease. Our findings suggest that it is possible to adjust the hardness of the gels by combining the enzyme reaction with heating. The hardness of the gel could be adjusted by addition of 1.5~2.0w/w% gelatin, therefore, gels prepared by a mixing milk and ginger juice have promising applications as food sources for elderly people or as foods for swallowing training.

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  • Toshikazu MATSUMOTO, Ai ISHIHARA, Norio ABE, Takafumi SAKURAI, Shota M ...
    2015 Volume 41 Issue 3 Pages 117-121
    Published: 2015
    Released on J-STAGE: August 14, 2022
    JOURNAL FREE ACCESS

     Curtain treatment with white reflection sheets at the veraison stage was applied to the wine grape 'Cabernet Sauvignon'. Compared with mulch treatment and the control, hanging sheets on both sides of the main stem of the grape tree significantly increased the coloration of the berries and wine and the anthocyanin content in the grape skins. Yeast-assimilable amino acid in the juice in curtain-treated grapes was significantly decreased compared with that in the control. Curtain treatment with white reflection sheets improved the color of red wine grapes.

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