ISHS Acta Horticulturae 464: International Postharvest Science Conference Postharvest 96
INTERNAL QUALITY EVALUATION OF TANGERINES IN NORTHERN THAILAND |
| Authors: | T. Yantarasri, J. Sornsrivichai |
| Abstract:
Tangerine (Citrus reticulata cv. ‘Khieo Waan’) harvested in northern Thailand often show internal disorders of granulation, dry juice sacs, loose peel and sunburn. Sorting out such internal disorders by conventional observation (by eye and sometimes by touch) is not reliable, particularly when the capacity of production is large. Our current research suggests that nondestructive techniques such as visible light, X-ray and NMR imaging may be developed as new nondestructive methods for detecting such internal disorders. Three nondestructive methods - visible light, X-ray and NMR imaging - have been tested for tangerine and several other citrus fruits. Fresh citrus fruits were purchased from an orchard in Chiang Mai. X-ray CT images were obtained at 120 kV and 80–100 mA with 2.8 s acquisition time, and NMR images were taken with a 0.5 Tesla superconducting magnet. Our preliminary tests suggest that the visible light transmitted through the fruits could be used to detect some internal disorders such as granulation, dry juice sacs and sunburn, while X-ray CT and NMR imaging could effectively detect granulation, dry juice sacs, loose peel and sunburn (Figure 1). | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
