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扁藻光合甘油脂的UPLC-Q-TOF-MS鉴定 被引量:1

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摘要 运用超高效液相色谱-四级杆飞行时间质谱联用分析系统(UPLC-Q-TOF-MS),直接分析总脂并建立了海洋扁藻(Tetr aselmis chuii)中光合甘油脂的精确结构鉴定方法.质谱采用电喷雾电离源(ESI),TOF采用V飞行模式,分别在正负离子模式下对总脂进行检测.根据在ESI-MS/MS下各种甘油脂产生的特征离子碎片对甘油脂进行结构鉴定,并根据负离子模式下产生的羧酸阴离子,确定各个甘油脂分子的脂肪酰基组成.结果从扁藻中共检测到40多种甘油脂,包括11种单半乳糖甘油二酯(MGDG),7种双半乳糖甘油二酯(DGDG),16种硫代异鼠李糖甘油二酯(SQDG)和9种磷脂酰甘油(PG),对这种微藻进行光合甘油脂的结构鉴定还不多见.此外,还鉴定出了一些传统GC-MS方法检测不到的羟基化脂肪酸,提供了扁藻光合脂质组的新信息.通过对sn-2位脂肪酸的比较研究表明,MGDG和SQDG主要通过原核途径合成,PG的形成是一种混合型生物合成途径;而DGDG在sn-2位特有C14:0和C16:0.这种方法提供了所有光合甘油脂的完整结构图谱,可以通过监测脂类的变化运用于海洋微藻的生理生态研究中.
出处 《中国科学(C辑)》 CSCD 北大核心 2008年第12期1177-1183,共7页 Science in China(Series C)
基金 教育部长江学者和创新团队支持计划(批准号:IRT0734) 国家高技术研究发展计划(批准号:2007BAD43B09) 宁波大学王宽诚幸福基金资助项目
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