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首页> 外文期刊>Grasas y aceites >Detection of olive oil adulteration by low-field NMR relaxometry and UV-Vis spectroscopy upon mixing olive oil with various edible oils
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Detection of olive oil adulteration by low-field NMR relaxometry and UV-Vis spectroscopy upon mixing olive oil with various edible oils

机译：将橄榄油与各种食用油混合后，通过低场NMR弛豫法和UV-Vis光谱法检测橄榄油的掺假

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Adulteration of olive oil using unhealthy substitutes is considered a threat for public health. Low-field (LF) proton (1H) nuclear magnetic resonance (NMR) relaxometry and ultra-violet (UV) visible spectroscopy are used to detect adulteration of olive oil. Three different olive oil with different oleoyl acyl contents were mixed with almond, castor, corn, and sesame oils with three volumetric ratios, respectively. In addition, Arbequina olive oil was mixed with canola, flax, grape seed, peanut, soybean, and sunflower seed oils with three volumetric ratios. Transverse magnetization relaxation time (T 2 ) curves were fitted with bi-exponential decaying functions. T 2 times of each mixture of olive oils and castor oils, and olive oils and corn oils changed systematically as a function of volumetric ratio. To detect the adulteration in the mixtures with almond and sesame oils, both LF 1 H NMR relaxometry and UV-Vis spectroscopy were needed, where UV-Vis-spectroscopy detected the adulteration qualitatively. In the mixtures of Arbequina olive oil and flax, peanut, soybean, and sunflower seed oils, both T 21 and T 22 values became longer systematically as the content of the olive oil was decreased. The unique UV-Vis maximum absorbance of flax oil at 320.0 nm shows the adulteration of olive oil qualitatively.
机译：使用不健康的替代品对橄榄油进行掺假被视为对公共健康的威胁。低场（LF）质子（1H）核磁共振（NMR）弛豫法和紫外（UV）可见光谱仪用于检测橄榄油的掺假。将三种具有不同油酰基酰基含量的不同橄榄油与三种体积比的杏仁油，蓖麻油，玉米油和芝麻油混合。此外，将Arbequina橄榄油与低芥酸菜子油，亚麻籽，葡萄籽，花生，大豆和葵花籽油按三种体积比混合。横向磁化弛豫时间（T 2）曲线具有双指数衰减函数。橄榄油和蓖麻油，橄榄油和玉米油的每种混合物的T 2倍随着体积比而系统地变化。为了检测杏仁油和芝麻油混合物中的掺假，需要LF 1 H NMR弛豫法和UV-Vis光谱法，其中UV-Vis光谱法可定性检测掺假。在Arbequina橄榄油和亚麻，花生油，大豆油和葵花籽油的混合物中，随着橄榄油含量的降低，T 21和T 22值均会系统地变长。亚麻油在320.0 nm处独特的UV-Vis最大吸光度定性地表明了橄榄油的掺假。

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    《Grasas y aceites》 |2017年第1期|共13页
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