【摘要】 <正> 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2×10⁶,不加热的分子量为13×10⁶和50×10⁶,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2×10⁶.Southwick用动态光散射法在4 mol/L尿素中测出其分子量为2.16×10⁶.G Holzwarth用透射电镜测出分子量为4×10⁶～20×10⁶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15×10⁶.可见,虽然实验方法和样品不同,但仍可确定其分子量在2×10⁶50×10⁶之间。更多还原

【Abstract】 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.更多还原