1. Institute
of Quality Standard and Testing Technology for Agro-products, Chinese
Academy of Agricultural Sciences, and Key Laboratory of Agro-food
Safety and Quality, Ministry of Agriculture, Beijing 100081, China
2. Beijing Titan Instruments Company, Limited, Beijing 100015, China
3. Eastern
Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, United States