Discrimination of the geographic origin of mangoes using fluorescence fingerprint.
Nakamura Y., Fujita K., Sugiyama J., Tsuta M., Shibata M., Yoshimura M., Kokawa M., Nabetani H., Araki T.
Author Affiliation: Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
Nippon Shokuhin Kagaku Kogaku Kaishi = Journal of the Japanese Society for Food Science and Technology 59 : 387-393
Abstract : A new method using fluorescence fingerprint (FF) to determine the geographic origin of mangoes was developed. The advantages of this method are that it is easy, non-destructive, and non-contact. Mangoes (Mangifera indica L., Irwin) harvested in 2010 and 2011 from Taiwan, Miyazaki and Okinawa were examined. FF of their pulp and skin were measured by a fluorescence spectrophotometer. Canonical discriminant analysis was applied to separate the two nationalities or three localities of geographic origin. This analysis was carried out for two datasets, i.e., data of 2010 and data of 2010+2011. The misclassification rates of validation samples were 3.2-19.2% and 7.7-13.6%, respectively. Conditions chosen as effective variables for both datasets were wavelengths from 260 to 290 nm in excitation and from 340 to 360 nm in emission. The fluorescence information of these wavelength ranges can contribute significantly to the determination of geographic origin for mangoes. In addition, we found that because of lower misclassification rates, FF is more suitable for skin than pulp. It is suggested that FF can be a practical method to determine geographic origin of mangoes.