摘要
Dintzis曾用经典光散射法测得经90℃、4 mool/L尿素处理3h的黄原胶分子量为2×10~6,不加热的分子量为13×10~6和50×10~6,但未知确切数据.Rinaudo和Milas以相同的方法在l×10^(-3)～l mool/L的氯化钠溶液中测得黄原胶的分子量为2×10~6.Southwick用动态光散射法在4 mol/L尿素中测出其分子量为2.16×10~6.G Holzwarth用透射电镜测出分子量为4×10~6～20×10~6之后,他又通过测定沉降系数和特性粘数,由MFS等式算出黄原胶原始分子量为15×10~6.可见,虽然实验方法和样品不同,但仍可确定其分子量在2×10~650×10~6之间。
The methods of ultracentrifugation, measuring molecular length by transmissive electron-microscope and small angle laser light-scattering were used to determine the molecular weight of self-made xanthan. The molecular weight measured by the three methods above are 2. 5×106, 6×106-2. 5×106 and 2. 36×106 dalton, respectively. Three results are well consistent with each other.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第7期789-791,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
黄原胶
分子量
Xanthan, Molecular weight, Ultracentrifugation, Transmissive electron- microscope, Small angle laser light-scattering
