FOOD SCIENCE ›› 2021, Vol. 42 ›› Issue (18): 240-245.doi: 10.7506/spkx1002-6630-20200814-184

• Safety Detection • Previous Articles     Next Articles

Geographical Origin Identification of Korla Fragrant Pear Based on Strontium Content and Stable Isotopic Ratio

ZHAO Duoyong, KANG Lu, WANG Zhi, QIAO Kunyun, LIU Zhihu, YUAN Yuwei, GUO Hang, ZHANG Rui, WANG Cheng   

  1. (1. Laboratory of Quality and Safety Risk Assessment for Agro-products (ürümqi), Ministry of Agriculture and Rural Affairs, Xinjiang Key Laboratory of Agro-products Quality and Safety, Institute of Quality Standards & Testing Technology for Agro-products, Xinjiang Academy of Agricultural Sciences, ürümqi 830091, China; 2. Jiuquan Forest Fruit Technology Services Network, Jiuquan 735008, China; 3. Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China)
  • Published:2021-09-29

Abstract: The purpose of this study is to evaluate the feasibility of the feasibility of identifying the geographical origin of Korla fragrant pear (KFP) by the strontium (Sr) content and 87Sr/86Sr isotopic ratio. Sr contents in Xinjiang KFPs, Shaanxi Hongxiangsu pears and Gansu fragrant pears as well as orchard soils for each fruit were analyzed by inductively coupled plasma mass spectrometry (ICP-MS), and 87Sr/86Sr isotopic ratios in the peel and pulp of KFP were determined by multiple collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The difference in Sr contents among the peel and pulp of the three fruits as well as the orchard soils, among the peel and pulp of KFP from different regions in Xinjiang, and among KFP orchard soils collected in different years was investigated by analyses of variance (ANOVA). The correlation between Sr contents in fruits and soils was analyzed and the distribution characteristics of 87Sr/86Sr isotope ratio and Sr contents in pear fruits from different geographical origins were discussed. The results showed that there were significant differences in the contents of Sr in pear orchard soils from Xinjiang, Gansu and Shaanxi Provinces (P < 0.05), but not in KFP orchard soils collected in different years. The contents of Sr in peel and pulp were significantly correlated with each other (P < 0.01), but not with soil Sr content. There was a significant difference in 87Sr/86Sr isotopic ratio (P < 0.05) but not Sr content in the pulp and peel of the three fruits. To sum up, KFP peel is more suitable for geographical origin identification by Sr isotope technique. It is feasible to identify the geographical origin of KFP based on Sr isotopic ratio.

Key words: Korla fragrant pear; strontium; isotope; geographical origin traceability; authenticity identification

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