高效液相色谱法测定大豆中卵磷脂的含量

应用高效液相色谱法(HPLC),选用Kromasil SIL柱,以甲醇/异丙醇/正己烷(60/35/5,V/V)为流动相,采用紫外检测器(205nm)对卵磷脂进行了测定。结果表明,大豆卵磷脂的保留时间为26.035min,定量线性范围2.06~30.9μg(r=0.9999),精密度和稳定性实验相对标准偏差均小于5%,加样回收率达97.41%,表明建立的大豆卵磷脂检测方法灵敏度高、稳定性和重现性好。     

脂质体用大豆卵磷脂的制备及质量评价

以大豆磷脂为原料,用溶剂-超临界CO2萃取法制备脂质体用高纯度大豆卵磷脂,并对其质量进行评价.结果表明大豆卵磷脂的含量是94.98%,丙酮不溶物的含量是99.0%,酸值是20.6KOH mg/g,干燥失重是0.63%,己烷不溶物的含量0.18%,砷盐的含量是2.1×10-6 %,重金属的含量是2.0×10-5 %.以精制的大豆磷脂为原料制备的脂质体,在透射电镜下呈圆球状.粒径为164 nm,Zeta电位为-28.50 mv,包封率是32.43%.     

Rapid semi-quantification of triacylglycerols,phosphatidylcholines, and free fatty acids in the rice bran of one grain

We developed a microplate assay method for determining the contents of triacylglycerols(TAGs), phosphatidylcholines(PCs), and free fatty acids(FFAs) in the rice bran of one grain using enzymatic reactions. In this method, enzymes from commercially available kits were used. Optimum reaction conditions were established. It was found that Nonidet P-40 was the optimal among the three surfactants used(Triton X-100, Tween 40, and Nonidet P-40) when lipid was dissolved in a reaction solution. Using this method, it was possible to quantify TAGs, PCs, and FFAs in concentration ranges of 7–150, 5–70, and 8–200 mg L~(–1), respectively. Furthermore, when the TAG contents in the rice bran were measured, the values closely corresponded to those obtained by extracting from large amounts of rice bran. However, sufficient data on the PC and FFA contents in rice bran are not available for valid comparisons. Although this method can accurately quantify the TAG contents in the rice bran of one grain, the accuracy of the PC and FFA contents has not been verified. Hence, future study is necessary.