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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Efficient Binding of Heavy Metals by Black Sesame Pigment: Toward Innovative Dietary Strategies To Prevent Bioaccumulation
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Efficient Binding of Heavy Metals by Black Sesame Pigment: Toward Innovative Dietary Strategies To Prevent Bioaccumulation

机译:黑芝麻色素对重金属的有效结合:旨在创新的饮食策略,以防止生物积累

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摘要

Black sesame pigment (BSP) was shown to bind lead, cadmium, and mercury at pH 7.0 and to a lower extent at pH 2.0. BSP at 0.05 mg/mL removed the metals at 15 mu M to a significant extent (>65% for cadmium and >90% for mercury and lead), with no changes following simulated digestion. The maximum binding capacities at pH 7.0 were 626.0 mg/g (lead), 42.2 mg/g (cadmium), and 69.3 mg/g (mercury). In the presence of essential metals, such as iron, calcium, and zinc, BSP retained high selectivity toward heavy metals. Model pigments from caffeic acid, ferulic acid, and coniferyl alcohol showed lower or comparable binding ability, suggesting that the marked properties of BSP may result from cooperativity of different sites likely carboxy groups and o-diphenol and guaiacyl functionalities. Direct evidence for the presence of such units was obtained by structural analysis of BSP by solid-state Fourier transform infrared spectroscopy and C-13 nuclear magnetic resonance spectroscopy.
机译:已显示黑芝麻色素(BSP)在pH 7.0时结合铅,镉和汞,在pH 2.0时结合程度较低。浓度为0.05 mg / mL的BSP可以在15μM的范围内去除大量金属(镉> 65%,汞和铅> 90%),模拟消化后没有变化。 pH 7.0时的最大结合能力为626.0 mg / g(铅),42.2 mg / g(镉)和69.3 mg / g(汞)。在必需金属(例如铁,钙和锌)的存在下,BSP保留了对重金属的高选择性。来自咖啡酸,阿魏酸和松柏树醇的模型颜料显示出较低或相当的结合能力,这表明BSP的显着特性可能是由于不同位点(如羧基,邻二酚和愈创木酚官能团)的协同作用所致。通过固态傅立叶变换红外光谱法和C-13核磁共振光谱法对BSP进行结构分析,获得了存在此类单元的直接证据。

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