食品科学

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淡丰后梅梅仁成分分析、油脂组成和蛋白质的物理性质

张艳艳1,葛姿言2,李庆卫3,李红卫1,吕林童2,范俊峰2,*   

  1. 1.北京农学院食品科学与工程学院,北京 102206;2.北京林业大学生物科学与技术学院,北京 100083;
    3.北京林业大学园林学院,北京 100083
  • 出版日期:2015-08-25 发布日期:2015-08-17
  • 通讯作者: 范俊峰
  • 基金资助:

    北京林业大学大学生科技创新基金项目(X201410022038)

Analysis of Chemical Constituents and Fatty Acid Composition of ‘Danfenghou’ Plum Seed Kernels and Physical Properties of Protein Extract

ZHANG Yanyan1, GE Ziyan2, LI Qingwei3, LI Hongwei1, LÜ Lintong2, FAN Junfeng2,*   

  1. 1. College of Food Science and Engineering, Beijing University of Agriculture, Beijing 102206, China;
    2. College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China;
    3. Landscape Architecture School, Beijing Forestry University, Beijing 100083, China
  • Online:2015-08-25 Published:2015-08-17
  • Contact: FAN Junfeng

摘要:

以淡丰后梅(Prunus mume cv. Danfenghou)梅仁为材料,分析其常量化学成分,研究梅仁油脂及蛋白的功能特性。结果表明,梅仁的粗油脂含量为(31.49±3.39)%,粗蛋白含量为(32.44±0.14)%。油脂中脂肪酸组成以油酸(62.599 74%)和亚油酸(28.959 75%)为主,二者总量高达91.3%,不饱和脂肪酸的相对含量为92.599 51%。VE中β-生育酚含量为0.32 mg/g,γ-生育酚含量为0.10 mg/g。氨基酸分析及评分表明,梅仁蛋白的氨基酸种类多且含量丰富,限制性氨基酸为赖氨酸,含量最高的氨基酸为谷氨酸。十二烷基磺酸钠-聚丙烯酰胺凝胶电泳结果表明,梅仁蛋白由6 条亚基组成,分子质量范围为15~47 kD。梅仁蛋白的等电点为pI 5.0,梅仁蛋白的乳化性为0.039,乳化稳定性为42.63 min,起泡性为37.04%,泡沫稳定性为41.67%。加热组样品的疏水性数值为408.29±1.09,高于未加热组样品(295.21±12.38)。

 

关键词: 淡丰后梅梅仁, 成分分析, 油脂组成, 蛋白质功能性质

Abstract:

In the present study, the chemical composition and fatty acid composition of ‘Danfenghou’ plum seed kernels
were analyzed, and functional properties of protein extract from the seed kernels were characterized. The results showed that
the kernels were rich in fat and protein containing values of (31.49 ± 3.39)% and (32.44 ± 0.14)%, respectively. The fatty
acid composition of the kernels mainly included oleic acid (62.599 74%) and linoleic acid (28.959 75%), which together
accounted for 91.3% of the total fatty acids, respectively. The content of total unsaturated fatty acids was 92.599 51%. Betatocopherol
and γ-tocopherol were the major forms of vitamin E, the contents of which were 0.32 and 0.10 mg/g, respectively.
Amino acid analysis and scores indicated that the kernels had abundant amino acids. Among the identified amino acids,
glutamate was the most abundant, while the limiting amino acid was lysine. SDS-PAGE showed that the kernel protein
was composed of six subunits with molecular weights ranging from 15 to 47 kD. The isoelectric point of the kernel protein
was determined to be pI 5.0. Its emulsifying property and emulsion stability were 0.039 and 42.63 min, respectively, and the
values of foaming ability and foam stability were 37.04% and 41.67%. The hydrophobicity of the heat-treated protein was
408.29 ± 1.09, which was higher than that (295.21 ± 12.38) of the control without any heat treatment. This study can provide
useful a for the development and utilization of the kernel.

Key words: ‘Danfenghou&rsquo, plum seeds, chemical constituents, fatty acid composition, functional properties of protein

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