新疆甜瓜锶同位素、矿质元素特征及产地溯源

Geographical Origin Trace of Muskmelon in Xinjiang Based on Strontium Isotope and Mineral Element Characteristics

建立甜瓜产地判别模型,为甜瓜原产地溯源提供理论依据。采集新疆哈密、吐鲁番、巴州和阿克苏的甜瓜样品,采用热电离质谱仪和电感耦合等离子体质谱仪测定锶同位素m(87Sr)∶m(86Sr)和多种矿质元素含量,结合化学计量学主成分分析和判别分析建立产地判别模型,对新疆不同产地甜瓜进行判别分析。多重比较结果表明,哈密甜瓜铝、铁和铷的含量显著高于吐鲁番、巴州和阿克苏等地;巴州甜瓜钙和钠的含量显著高于吐鲁番、哈密和阿克苏等地。巴州和阿克苏甜瓜m(87Sr)∶m(86Sr)显著高于哈密和吐鲁番。选取m(87Sr)∶m(86Sr)和8种矿质元素(钙、钾、钠、钒、铬、镍、砷和铷)建立的判别模型,4个产地甜瓜回代检验、留一交叉验证的整体判别率分别为100%、93.8%。利用m(87Sr)∶m(86Sr)和多种矿质元素结合化学计量学方法对新疆不同产地甜瓜判别可行。

A discriminant model of muskmelon origin was established to provide theoretical basis for geographical origin trace of muskmelon.In this study,the contents of strontium isotopes m(87Sr)∶m(86Sr)and various mineral elements of melon species in melon samples collected from Hami,Turpan,Bazhou and Aksu of Xinjiang were determined by thermoelectric ionization mass spectrometer and inductively coupled plasma mass spectrometer.The discriminant analysis model was established in combination with principal components and discriminant analysis in stoichiometry to conduct discriminant analysis on melon from different producing areas in Xinjiang.Multiple comparison results showed that Al, Fe and Rb contents of Hami melon were significantly higher than those of Turpan, Bazhou and Aksu. The contents of Ca and Na in melon in Bazhou were significantly higher than those in Turpan, Hami and Aksu. The m(87Sr)∶m(86Sr) of melon in Bazhou and Aksu significantly higher than m(87Sr)∶m(86Sr) of melon in Hami and Turpan. The discriminant model was established based on m(87Sr)∶m(86Sr) and 8 mineral elements, including Ca, K, Na, V, Cr, Ni, As and Rb. The overall discriminative rates of back-substitution and leave-one-out cross-validation of four-ground melon were 100% and 93.8%, respectively. It could be feasible to discriminate muskmelon from different producing areas in Xinjiang by m(87Sr)∶m(86Sr) and various mineral elements combined with stoichiometry.