食品科学

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基于体外模拟消化/Caco-2细胞模型测定大米中铅的生物有效性

方 勇1,夏 季1,李红梅2,陈 悦1,裴 斐1,孔令艳1,杨佩玲1,胡秋辉1   

  1. 1.南京财经大学食品科学与工程学院,江苏省粮油品质控制及加工技术重点实验室,江苏省现代粮食流通与
    安全协同创新中心,江苏 南京 210023;2.国家有机食品质量监督检验中心,江苏 宝应 225800
  • 出版日期:2016-08-25 发布日期:2016-08-30
  • 基金资助:

    国家自然科学基金面上项目(31471680);江苏省自然科学基金项目(BK20131006);
    江苏省高校优势学科建设工程资助项目(PAPD)

Determination of the Bioavailability of Lead in Rice by in vitro Simulate Digestion/Caco-2 Cell Model

FANG Yong, XIA Ji, LI Hongmei, CHEN Yue, PEI Fei, KONG Lingyan, YANG Peiling, HU Qiuhui   

  1. 1. Key Laboratory of Grains and Oils Quality Control and Processing, Cooperative Innovation Center for Modern Grain Circulation and
    Security of Jiangsu Province, College of Food Science and Engineering, Nanjing University of Finance and Economic,
    Nanjing 210023, China; 2. National Organic Food Quality Supervision and Inspection Institute, Baoying 225800, China
  • Online:2016-08-25 Published:2016-08-30

摘要:

为考察铅污染大米对人体的潜在健康风险,研究建立体外模拟消化/Caco-2细胞模型来测定大米中铅的生物有效性。结果表明:在模拟大米中铅的胃肠消化过程中,生米和熟米在胃消化阶段铅的生物利用率为61.34%~70.59%和39.69%~47.48%,肠消化阶段分别为24.39%~41.79%和13.57%~15.13%,经胃肠消化后籼米中铅的生物利用率均高于粳米,生米经胃、肠消化生物有效性程度均高于蒸煮后的大米。建立并利用成熟Caco-2细胞模型对大米中铅的生物有效性进行测定,使用四乙基铅与无机铅对大米加标,生米的生物有效性为3.32%和7.0%,熟米的生物有效性为2.65%和5.7%。体外模拟消化/Caco-2细胞模型是一种评价大米中铅生物有效性的有效手段。

关键词: 铅, 大米, 体外消化, Caco-2细胞, 生物有效性

Abstract:

A method to determine both the bioaccessibility and bioavailability of lead in rice grains using in vitro digestion/
Caco-2 cell model was established. The results indicated that the bioaccessibility of lead in uncooked rice and cooked rice
in simulated gastric digestion were 61.34%–70.59% and 39.69%–47.48%, as well as 24.39%–41.79% and 13.57%–15.13%
in simulated intestinal digestion, respectively. The lead bioaccessibility of indica rice was higher than that of japonica rice,
and uncooked rice was higher than cooked rice. A Caco-2 cell model was established to evaluate the bioavailability of lead
in rice. The bioavailability of tetraethyl lead (TTEL) and inorganic lead spiked in cooked rice were 3.32% and 7.0%, while
those in spiked uncooked rice were 2.65% and 5.7%, respectively. In vitro digestion/Caco-2 cell model can be used as an
effective method to evaluate the bioavailability of lead in rice.

Key words: lead, rice, in vitro digestion, Caco-2 cell, bioavailability

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