摘要:
A method for the simultaneous determination of water-soluble sugars in fresh jujubes by high performance liquid chromatography with evaporative light-scattering detector (HPLC-ELSD) was established.The carbohydrates were separated on a chromatographic column of Waters XBridgeTM Amide (4.6 mm × 250 mm,5 μm) with a mobile phase consisting of A (0.2% triethylamine aqueous solution) and B (0.2% triethylamine in acetonitrile) (A∶B =24∶76,V/V).The column temperature was 30 °C and the atomization temperature was 60 °C.The drift tube temperature of ELSD was 60 °C.Nitrogen was used as the carried gas with a flow rate of 1.6 L/min and a gain value of 1.0.These experimental conditions allowed good separation of water-soluble sugars,such as rhamnose,arabinose,glucose,mannose,glucose,sucrose,maltose and lactose with a resolution of 1.5 or above.Good linearity was observed for the analytes in the concentration range of 0.099-1.040 ng/μL.The recoveries of spiked real samples ranged from 93.1% to 111.2%,with relative standard deviation (RSD) values below 5%.The limits of detection (RSN=3) were in the range of 0.008-0.03 ng/μL.This method had a lot of advantages including simple operation,effective separation and time saving,and could be used to determine water-soluble sugars in fresh jujube.Compared with the traditional spectrophotometric method,HPLC-ELSD was more sensitive and accurate making it more suitable for quality identification of fresh jujube.%采用高效液相色谱-蒸发光散射检测器建立鲜枣果实中不同种类可溶性糖含量的测定方法.结果表明:适宜分离条件为Waters XBridgeTM Amide色谱柱(4.6 mm×250 mm,5μm),流动相A为0.2%三乙胺的超纯水溶液,流动相B为0.2%三乙胺-乙腈溶液,两相体积比为24∶76,柱温30°C,雾化管温度60°C,漂移管温度60°C,气流量1.6 L/min,增益值1.0.在该条件下鼠李糖、阿拉伯糖、果糖、甘露糖、葡萄糖、蔗糖、麦芽糖和乳糖均能得到较好分离(分离度≥1.5),在0.099~1.040 ng/μL范围内呈良好线性关系,8种糖的加标回收率在93.1%~111.2%之间,相对标准偏差均小于5%;检出限(RSN=3)在0.008~0.03 ng/μL之间.该方法具有操作简便、分离效果好、分离时间短等特点,可用于鲜枣果实中不同种类可溶性糖含量的测定,与传统方法相比较更加灵敏准确,有利于品质鉴定.