Oyster (Crassostrea gigas) extract, which is obtained by extracting nutritional and functional components from raw
oysters, contains zinc, glycogen, taurine, and so on. The extract is useful as a raw material for health foods. Oyster
extracts harvested from oysters in different production areas by adjusting methods devised by each producer have
a protective effect on the immune regulation and intestinal microflora. In particular, the effects of orally administered
oyster extract on the composition ratio of intestinal lactic acid bacteria were up regulated in the cecal and fecal
microflora. Furthermore, it has also been reported that oral administration of Lactobacillus plantarum ATCC8014
strain in rats may have a certain protective effect on the intestine by increasing the intestinal barrier function and
preventing acrylamide from entering the tissues. Therefore, in this study, we used the lactic acid bacteria L. plantarum
ATCC 8014 strain to examine the effect on lactic acid bacteria by directly adding oyster extract (OE) extracted
from raw oysters to a nutrient medium.
When OE was added to the media, no significant difference was observed in either the 1.0% or 0.5% OE addition
group, compared to the control group after 1.5 hours of culture. Rather, it showed a tendency of suppression. However,
after three hours of culture, the growth-promoting effect abruptly appeared, and after six hours of culture, the
growth-promoting effect of 1.0% and 0.5% OE containing groups were 114% and 113%, respectively, compared to the
control group. In particular, in the 0.5% OE containing group, after culturing for nine hours and 12 hours, significant
growth-promoting effects of 110% and 107% (p < 0.05), respectively, were observed compared to the control group.
By the time 24 hours had passed, the changes compared to the control group had become 100% and 103% in the
1.0% and 0.5% OE added groups, respectively and the proliferation promoting effect had diminished. It was suggested
that such a transient lactic acid bacteria growth-promoting effect caused by the consumption and depletion of the
growth-promoting factor contained in the OE after six hours of culture.
抄録全体を表示