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KMID : 1134820220510090942
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Journal of the Korean Society of Food Science and Nutrition
2022 Volume.51 No. 9 p.942 ~ p.949
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Discriminant Analysis of Organic Vegetables and Non-Organic Vegetables Using Stable Isotope Ratios
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Oh Hyun-Jeong
Kim Yun-Ju
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Abstract
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The objective of this study was to find out whether nitrogen stable isotopes could be used as a discrimination index for organic and non-organic vegetables such as cabbage, carrots, broccoli, peppers, and onions to enhance the consumers confidence in organic agricultural products. Analysis of the nitrogen and carbon isotope ratios revealed that the nitrogen isotope ratio of organic vegetables (n=102) and non-organic vegetables (n=88) distributed in Korea ranged between 2.9∼10.6‰ and -1.5∼4.8‰, respectively. With the exception of broccoli, the nitrogen isotope ratios of organic and non-organic vegetables differed significantly. Furthermore, analysis of the carbon isotope ratios of organic and non-organic vegetables distributed in Korea revealed that the carbon isotope ratio of organic vegetables ranged from -30.1∼-26.3‰, and inorganic vegetables ranged from -28.9∼-24.5‰. Some vegetables showing statistical significance are the result of the greenhouse effect or differences in crop photosynthesis. The distinction between carbon isotope ratios was unclear as a result of multiple analyses and comparisons of nitrogen isotope ratios and carbon isotope ratios of vegetables grown using organic and conventional farming methods. However, the nitrogen isotope ratio between organic and non-organic farming was clearly differentiated. Therefore, it is expected that the nitrogen isotope ratio can be applied as a discrimination index to determine the domestic distribution of organic products.
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KEYWORD
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nitrogen isotope ratio, organic, vegetable, IR-MS
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