国家自然科学基金No.31201501;农业部农产品质量安全检测与评价重点实验室开放基金No.NK201302;国家级大学生创新训练项目No.201310504004Supported by the National Natural Science Foundation of ChinaNo.31201501,the Open Fund of Key Laboratory of Testing and Evaluation for Agroproduct Safety and Quality,Ministry of Agriculture No.NK201302 and the National Undergraduate Training Programs for Innovation and Entrepreneurship No.201310504004