HPSEC-ELSD法同时测定白及多糖的分子量和含量
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篇名: HPSEC-ELSD法同时测定白及多糖的分子量和含量
TITLE:
摘要: 目的:建立同时测定白及多糖的分子量及其含量的方法。方法:采用高效分子排阻色谱-蒸发光散射检测(HPSEC-ELSD)法。色谱柱为TSK-GEL G4000 PWXL,流动相为纯水,流速为0.6 mL/min,柱温为30 ℃,进样量为20 μL,采用蒸发光散射检测器。采用建立的方法测定3批白及多糖的分子量及其含量。结果:白及多糖的重均分子量测定线性范围为24.17~178.00 kD(R2=0.985 5),BT07含量测定线性范围为0.508 0~5.080 mg/mL(R2=0.998 4),检测限、定量限分别为0.116 5 、0.274 0 mg/mL,精密度、稳定性、重复性试验的RSD 均<2%(n=6或n=7);白及多糖样品含量测定平均加样回收率为99.16%~100.20%(RSD=0.39%~0.64%,n=9)。3批样品的平均保留时间为14.28 min (RSD=4.35%,n=3),平均重均分子量为23.54 kD(RSD=3.78%,n=3),多分散系数(D,MW/Mn)范围为1.463~1.578,样品平均含量为93.4%(RSD=4.22%,n=3)。结论:建立的HPSEC-ELSD法操作简便 、快速,结果准确可靠,可同时测定白及多糖的分子量和含量。
ABSTRACT: OBJECTIVE: To set up a method for determination of molecular weight and content of polysaccharide in Bletilla striata. METHODS: HPSEC-ELSD method was adopted. The determination was performed on TSK-GEL G4000 PWXL column with mobile phase consisted of pure water at the flow rate of 0.6 mL/min. The column temperature was 30 ℃, and sample size was 20 μL. Evaporative light scattering detector was used. The molecular weight and content of polysaccharide in 3 batches of B. striata were established. RESULTS: The linear range of weight average molecular weight of B. striata polysaccharide were 24.17-178.00 kD(R2=0.985 5). The linear range of BT07 content determination were 0.508 0-5.080 mg/mL(R2=0.998 4). The limits of detection and quantitation were 0.116 5 and 0.274 0 mg/mL. RSDs of precision, stability and reproducibility tests were all lower than 2% (n=6 or n=7). Average recoveries rate were 99.16%-100.20% (RSD=0.39%-0.64%,n=9). Average retention time of 3 batches of samples was 14.28 min (RSD=4.35%, n=3), and weight average molecular weight was 23.54 kD (RSD=3.78%,n=3). Polydispersity coefficient D,MW/Mn)ranged 1.463-1.578. Average content of sample was 93.4% (RSD=4.22%, n=3). CONCLUSIONS: HPSEC-ELSD method is simple, rapid, accurate and reliable, which can be used for simultaneous determination of B. striata polysaccharide.
期刊: 2018年第29卷第9期
作者: 王川,张燕,李楠,李雅丽,刘江云,蔡培烈,郝丽莉
AUTHORS: WANG Chuan,ZHANG Yan,LI Nan,LI Yali,LIU Jiangyun,CAI Peilie,HAO Lili
关键字: 白及;多糖;高效分子排阻色谱-蒸发光散射检测法;分子量;含量
KEYWORDS: Bletilla striata; Polysaccharide; HPSEC-ELSD; Molecular weight; Content
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