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超高效液相色谱法快速测定烟草样品中的植物色素

2018-02-13王晋黄海涛刘欣许永李晶孔维松张涛张承明杨光宇李雪梅

湖北农业科学 2018年22期
关键词:烟草

王晋 黄海涛 刘欣 许永 李晶 孔维松 张涛 张承明 杨光宇 李雪梅

摘要:建立超高效液相色谱法快速测定烟草中植物色素(新黄质、紫黄质、叶黄素、叶绿素-a、叶绿素-b、β-胡萝卜素)检测方法。90%丙酮超声萃取30 min,色谱柱为Waters ACQUITY UPLCTM BEH C18(2.1 mm×50 mm,1.7 μm),流动相为乙腈-水梯度洗脱,以体积比按(乙腈90%+10%水),4.0 min(100%乙腈)的梯度条件,流速为0.8 mL/min,用二极管阵列检测器检测。6种色素在5 min内分离,检测限15~22 ng/mL,平均回收率为93%~105%。采用自主设计的样品萃取瓶进行前处理,前处理简单快速,同时,色谱分离周期明显缩短,与目前行业标准相比,样品分析效率提高了4倍以上。

关键词:超高效液相色谱;烟草;植物色素;快速测定

中图分类号:O656.3         文献标识码:A

文章编号:0439-8114(2018)22-0124-04

DOI:10.14088/j.cnki.issn0439-8114.2018.22.034           开放科学(资源服务)标识码(OSID):

Abstract: Established a ultra performance liquid chromatography(UPLC) method for the rapid determination of plant pigments(neoxanthin,violaxanthin,lutein,chlorophyll-a,chlorophyll-b and β-carotene) in tobacco. The plant pigments were extracted from samples with 90% acetone by ultra-sonic extraction. Then,the plant pigments were separated by Waters ACQUITY UPLCTM BEH C18(2.1 mm×50 mm,1.7 μm) column, with and water mixture as mobile phase at a flow-rate of 0.8 mL/min. It eluted with gradient elution (90% V(acetonitrile))+10% V(water)) at the beginning,then the gradient elution replaced by acetonitrile 4 min later. These plant pigments were detected by diode array detector. Under the optimal conditions,6 kinds of plant pigments could be effectively separated within 5 min. The limits of detection(LODs) of 6 kinds of plant pigments were 15~22 ng/mL and the average recoveries were in the range of 93% to 105%. Via the self-designed sample extraction bottle using for pretreatment,and improved chromatography conditions,this method efficiency was enhanced 4 times than the current tobacco standard.

Key words: ultra performance liquid chromatography; tobacco; plant pigments; rapid determination

植物色素是煙草生长和利用太阳能进行光合作用的重要物质,同时也是影响烟草品质的重要成分,它们对烟叶的色泽和香味也有着重要影响[1-4]。在烟叶调制过程中,叶绿素类化合物的降解是评价烟叶调制好坏的重要指标,类胡萝卜素是烟草中重要的香气前体化合物,许多烟草特征香气成分,如β-大马酮、巨豆三烯酮、二氢猕猴桃内酯等均是类胡萝卜素降解产物[1-5]。因此,烟草中植物色素的准确测定对烟草质量评价具有重要的意义。烟草色素的测定通常采用分光光度法、近红外光谱法和高效液相色谱法,其中分光光度法准确性较差,而近红外光谱法只能进行1种半定量的预测[4-7]。传统的液相色谱法由于分离效率高、选择性好、检测灵敏度高、操作自动化,在烟草植物色素分析中得到了广泛应用[6,7]。……

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