角叉菜卡拉胶的研究——Ⅱ.雌配子体与四分孢子体角叉菜卡拉胶的季节变化

CARRAGEENANS FROM CHONDRUS OCELLATUS Ⅱ. SEASONAL VARIATION OF CARRAGEENANS IN THE CYSTOCARPIC AND TETRASPORIC STAGES OF CHONDRUS OCELLATUS

本文研究了雌配子体和四分孢子体两种世代角叉菜卡拉胶的季节变化。不论雌配子体还是四分孢子体角叉菜,其卡拉胶的产率都是夏、秋季高,冬季低。四分孢子体卡拉胶不凝固,雌配子体卡拉胶的凝胶强度是7和12两月的较高,其凝固点没有季节性变化。四分孢子体卡拉胶的粘度在秋、冬季较高,雌配子体的粘度无季节变化。雌配子体和四分孢子体卡拉胶的3,6-AG含量都是夏、秋季较高,冬季较低。硫酸基含量都是秋季的稍高。 上述结果证明,世代是决定角叉菜卡拉胶的物理性质和化学组成最主要的因素,当世代相同时,季节对所含卡拉胶的产率、物理性质和化学组成也有不同程度的影响。

The seasonal variations in yield, gel strength, gelation temperature, viscosity and contents of 3,6-AG and sulfate of carrageenan extracted from cystocarpic and tetrasporic stages of Chon-drus ocellatus collected in Qingdao, China have been studied.1. The yields of carrageenan from cystocarpic and tetrasporic C. ocellatus in summer and autumn were higher than that in winter.2. The cystocarpic plants collected in July and December gave carrageenans higher gel strength, nevertheless the gelation temperature of cystocarpic carrageenan did not show any significant seasonal variation. The carrageenans produced from tetrasporic plants failed to form a gel.3. The carrageenans derived from tetrasporic plants showed the marked seasonal variation in viscosity, which appeared to be high in autumn and winter. But no seasonal variation was observed to those derived from cystocarpic plants.4. For the carrageenan obtained from cystocarpic and tetrasporic plants, the contents of 3,6-AG were slightly higher in summer and aut umn, and the sulfate contents were slightly higher in antumn.The results obtained show that the properties of carrageenan extracted from C. ocellatus mainly depend on the life stage of the plant, and if the life stages are the same, the season for collection is also a factor affecting in certain degree the yield and properties of carrageenan.