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应用核磁共振时域二维弛豫相关谱分析的方法 ,对玉米胚芽的核磁共振弛豫特性进行了研究 .对以下三种样品进行了测定 :(1 )胚芽不含油 (用化学方法蒸馏出 )但是含有不同百分含量的水 ;(2 )胚芽不含水 (真空蒸发 )但是含有不同百分含量的油 ;(3 )含有不同百分含量的水的胚乳 水系统 .研究表明随着水含量的增加水的纵向弛豫时间T1减小 ,表明水与胚芽基质具有强烈的相互作用 ,而油的纵向弛豫时间T1随着油含量的增加变化很小 ,表明油与胚芽基质之间没有大的相互作用 ,油几乎独立地处在胚芽中 ;对低水分 (少于5% )玉米胚芽 水系统 ,结果表明水是束缚于胚芽基质上 ,而油则是以油胞的形式存在于胚芽中 .在玉米胚芽 水系统中有两个T1弛豫成分 ,长T1弛豫成分从基质到水的交换率为 57s- 1;从水到基质的交换率为 1 1 3s- 1.短T1成分从基质到水的交换率为 2 4 5s- 1;从水到基质的交换率为 82 1s- 1.在低水合状态下 ,胚乳 水系统仅有一个T1弛豫成分 .胚乳到水的交换率高于 3 7s- 1.
The NMR relaxation characteristics of maize germ were studied using the two-dimensional relaxation-time correlation spectroscopy in the time domain of nuclear magnetic resonance, and the following three samples were determined: (1) germ was free of oil (chemically distilled) But contain different percentages of water; (2) embryos do not contain water (vacuum evaporation) but contain different percentages of oil; (3) endosperm water systems with different percentages of water. Studies have shown that with water content Increasing the longitudinal relaxation time T1 of the water decreases, indicating that water has a strong interaction with the germ matrix while the longitudinal relaxation time T1 of the oil varies little with increasing oil content, indicating that there is no large difference between the oil and germ matrix For oil with low moisture (less than 5%), corn germ water systems show that water is bound to the germ matrix, whereas oil is present in the germ as oil cells. There are two T1 relaxation components in the corn germ water system, the exchange rate of the long T1 relaxation component from substrate to water is 57 s-1 and the exchange rate from water to substrate is 1 1 3 s -1. The short T1 component is removed from the substrate The exchange rate to water is 2 4 5s-1; from The rate of exchange matrix 82 1s- 1. In a low hydration state, only a T1 relaxation endosperm water system components endosperm to the exchange rate of water in 3 7s- 1.