紫菜胶与紫菜琼胶

研究了坛紫菜所含多糖的年率、性质和组成。用水直接提取的多糖产率为５．４５～６．８９％，无凝固性，含ＳＯ４１２．７３～１４．０８％，含３，６－ＡＧ９．９８～１２．１２％。经碱处理后提取的多糖产率为４．９～９．５％，最高的达１９．１％，它能形成很好的凝胶，其凝胶强度达７５０～１１００ｇ／ｃｍ＾２，含ＳＯ４０．２０～０．７５％，含３，６－ＡＧ４０．２８～４３．０４％，它的红外光谱和＾１３Ｃ－ＮＭＲ波谱与

STUDIES ON THE PORPHYRAN AND PORPHYRA AGAR

The yield,properties and composition of polysaccharides extracted from Chinese Porphyrs hartanensis were studied. The yield of polysaccharides extracted directly with water was 5. 45-6. 89 %. It failed to form a gel and contained 12. 73-14. 08% of SO4and 9. 98-12. 11 % of 3, 6-AG. The yield of polysaccharides isolated from alkali-treated Porphyra was 4. 9-9. 5%. The highest may reach 19. 1 %. It forms very strong gets with the gel strength of 750-1 100g/cm2(1. 0% gel) and contained 0. 20-0. 75% of SO4and 40. 28 43. 04% of 3, 6-AG. The IR 13 C-NMR spectra of the alkali-treated products were very similar to that of agarose. So it seems to be suitable to call the former porphyran and to call the later porphyra agar. The results show that P. haitanesis may be used as raw material for agar industuy.