Geographical Origin Traceability of Rice: A Study on the Effect of Processing Precision on Index Elements

Abstract

The stability of mineral elements in rice is not only related to genotype and environmental factors, it is also related to processing precision. In this study, japonica rice from Jiansanjiang, Heilongjiang province, China, was analyzed and divided into five processing grades. Analysis of elements in the rice using inductively coupled plasma-mass spectrometry (ICP-MS) indicated that Na, Mg, Al, K, Ca, Cr, Mn, Fe, Co, Cu, Zn, Rb, Sr and Ba contents differed due to the influence of different processing precision. By removing elements which were significantly changed by processing, we were able to establish a more stable origin traceability model of rice, with an average discrimination accuracy of 96.1% and cross validation accuracy of 93.9%. Results from our study aid in improving the stability of the geographical origin traceability model, thereby making it suitable to be used for rice with various processing precisions.