食品科学 ›› 2018, Vol. 39 ›› Issue (20): 240-245.doi: 10.7506/spkx1002-6630-201820035

• 工艺技术 • 上一篇    下一篇

籼米中淀粉粒结合蛋白的分离鉴定及提取工艺优化

陈兰煊,杨阳,易翠平*   

  1. (长沙理工大学化学与生物工程学院,湖南?长沙 410114)
  • 出版日期:2018-10-25 发布日期:2018-10-24
  • 基金资助:
    国家自然科学基金面上项目(31771899)

Isolation and Identification of Starch Granule-Associated Proteins (SGAPs) from Indica Rice

CHEN Lanxuan, YANG Yang, YI Cuiping*   

  1. (School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China)
  • Online:2018-10-25 Published:2018-10-24

摘要: 采用十二烷基硫酸钠(sodium dodecyl sulfate,SDS)缓冲体系分离提取碱洗籼米粉中的淀粉粒结合蛋白(starch granule-associated proteins,SGAPs),经高效液相色谱-串联质谱法鉴定表明:碱洗得到上、中、下层籼米淀粉中的SGAPs均主要为淀粉合成酶I(granule-bound starch synthase I,GBSS I),其他组分略有差别;其中以中层SGAPs含量最高,GBSS I达99.8%,谷蛋白质量分数仅为0.11%。采用响应面优化中层淀粉SGAPs的提取参数,得到最优条件为SDS添加量10.90%、煮沸时间4.10?min、MgSO4浓度0.90?mmol/L,此时SGAPs提取量为(1?028.61±0.05)μg/g。

关键词: 籼米, 淀粉粒结合蛋白(SGAPs), 高效液相色谱-串联质谱法, 淀粉合成酶I(GBSS I), 响应面优化

Abstract: Starch granule-associated proteins (SGAPs) from indica rice were isolated by sodium dodecyl sulfate (SDS) buffer from alkali washed rice flour and then identified by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Results indicated that the SGAPs from the top, middle and bottom starch layers mainly consisted of granule-bound starch synthase I (GBSS I), which slightly varied with respect to other components. Among these layers, the content of SGAPs in the middle layer was the highest, with GBSS I accounting for up to 99.8% and gluten accounting for only 0.11% of the total. Using the response surface methodology, the optimized conditions for SGAPs extraction from the middle layer starch were obtained as follows: SDS 10.90%, boiling time 4.10 min and MgSO4 0.90 mmol/L. Under these conditions, the yield of SGAPs was (1 028.61 ± 0.05) μg/g.

Key words: rice, starch granule-associated proteins, HPLC-MS/MS, granule-bound starch synthase I, response surface methodology

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