食品科学

• 基础研究 •    下一篇

7 种十字花科种子中黑芥子酶降解油菜籽饼粕中硫苷的产物比较分析

丁 艳,李丽倩,顾振新,韩永斌   

  1. 南京农业大学食品科技学院,江苏 南京 210095
  • 出版日期:2014-07-15 发布日期:2014-07-18

Comparative Effects of Myrosinase from Cruciferous Seeds on the Glucosinolate Degradation Products in Rapeseed Meal

DING Yan, LI Li-qian, GU Zhen-xin, HAN Yong-bin   

  1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Online:2014-07-15 Published:2014-07-18

摘要:

比较7 种十字花科植物种子中的黑芥子酶的活性,利用气相色谱-质谱法(gas chromatography-massspectrometry,GC-MS)分别测定这7 种黑芥子酶降解油菜籽饼粕中硫代葡萄糖苷(简称硫苷)的产物组分和相对含量。结果表明:7 种来源的黑芥子酶比活力存在差异(P<0.05),比活力由高到低依次为西兰花籽黑芥子酶(broccoli seeds myrosinase,BSm)、油菜籽黑芥子酶(rape seeds myrosinase,RPSm)、白菜籽黑芥子酶(whitecabbage seeds myrosinase,WCSm)、萝卜籽黑芥子酶(radish seeds myrosinase,RDSm)、芥蓝籽黑芥子酶(kaleseeds myrosinase,KSm)、甘蓝籽黑芥子酶(cabbage seeds myrosinase,CSm)和芥菜籽黑芥子酶(mustard seedsmyrosinase,MSm)。GC-MS比较分析7 种黑芥子酶降解油菜籽饼粕中硫苷的产物发现,RPSm降解产物有6 种,即1-丁烯基-4-异硫氰酸酯、烯丙基异硫氰酸酯、2-苯乙基异硫氰酸酯、苯丙腈、致甲状腺肿素和2,1-苯并异恶唑。CSm降解产物中1-丁烯基-4-异硫氰酸酯含量最高(33.22%),RPSm次之,含量为32.20%,而MSm降解产物中未检测到。WCSm、KSm、MSm和CSm降解产物中检测到新组分丁基异硫氰酸酯。与RPSm降解产物相比,其他6 种黑芥子酶降解产物中恶唑类及腈类物质种类增多,有4 种恶唑类和3 种腈类,但降解产物中未检测到2,1-苯并恶唑。不同来源的黑芥子酶在相同环境下降解油菜籽饼粕中的硫苷的产物种类和相对含量存在明显差异,虽RPSm活性低于BSm,但其降解产物中恶唑类及腈类种类最少,含量最低,是较好的降解油菜籽饼粕中硫苷的酶源。

关键词: 黑芥子酶, 油菜籽饼粕, 气相色谱-质谱法, 硫代葡萄糖苷

Abstract:

The aim of this study was to compare the specific activity of myrosinases from the seeds of seven cruciferous
plants, and the composition of glucosinolates in rapeseed meal degraded by these different myrosinases were determined by
gas chromatography-mass spectrometry (GC-MS). The results showed that the specific activities of seven myrosinases were
significantly different (P < 0.05) and followed the descending order: broccoli seeds (BSm) > rapeseeds (RPSm) > white
cabbage seeds (WCSm) > radish seeds (RDSm) > kale seeds (KSm)> cabbage seeds (CSm) > mustard seeds (MSm).
Six compounds were detected in the degraded products by myrosinase from RPS (RPSm): 1-butene,4-isothiocyanate, allyl
isothiocyanate, benzene,2-ethyl,isothiocyanate, benzenepropane nitrile, goitrin and 2,1-benzisoxazole. The highest content (33.22%)
of 1-butene,4-isothiocyanate was found in the degraded products by myrosinase from CS (CSm), which was more than the content
of 32.20% by RPSm. Besides, under the same experimental conditions, this compound was not detected in the degraded products
by myrosinase from MS (MSm). Butane,1-isothiocyanate was a new compound found in the degraded products by myrosinases
from WCS, KS , MS and CS. Comparing with RPSm, four new oxazoles and three new nitrils but not 2,1-benzisoxazole were
found in the degraded products by six other myrosinases. Under the same condition, the glucosinolates degradation products
generated by RPSm and other myrosinases were significantly different. The specific activity of RPSm was lower than that of BSm,
but the sorts and contents of oxazoles and nitriles in its degradation products were the least. It can be concluded that RPSm is the
appropriate myrosinase source to degrade the glucosinolates in rapeseed meal.

Key words: myrosinase, rapeseed meal, gas chromatography-mass spectrometry (GC-MS), glucosinolates