Mechanical and Light Properties of Mangosteen Fruit as Related to Postharvest Quality

    Volume 36, Issue 2 (March 2008)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 21 December 2007

    Page Count: 7


    Jarimopas, Bundit
    Department of Agricultural Engineering, Kamphaengsaen Engineering Faculty, Kasetsart University, Nakhon Pathom,

    Pushpariksha, Phanida
    Department of Agricultural Engineering, Kamphaengsaen Engineering Faculty, Kasetsart University, Nakhon Pathom,

    Singh, S. Paul
    School of Packaging, Michigan State University, East Lansing, MI

    Singh, Jay
    Orfalea College of Business, Cal Poly State University, San Luis Obispo, CA

    (Received 27 March 2006; accepted 8 October 2007)

    Abstract

    During this study the postharvest damages of fresh mangosteen at wholesale level in Thailand were investigated from April to October 2004. Damages included fruit cracking, hard rind, rough surface, translucent flesh, gummosis, and decay. Total percentage of all damages that made fruit inedible was 43.3 % of production yield. Weight, volume, and dimension of large, medium, small, and undersized mangosteens were measured. The term of dimension ratio was introduced as a sizing parameter compared to the conventional trade parameter. The coefficient of static friction was also determined. This coefficient for gloss and rough surface mangosteens on plexiglass, plywood, and galvanized iron steel varied from 0.31 to 0.46. Color of sound and defective fruits was measured in terms of tristimulus values, X, Y, and Z. It was observed that the corresponding chromaticity coordinates, x and z for mangosteens depend on their maturity stage while y depends on the type of fruit surface. A color ratio term is proposed to be used as a nondestructive technique for detecting internal defects of mangosteens. The highest percentage of correct prediction was found at the color ratio X1/X2> 1.25 at 67.4 %


    Paper ID: JTE100559

    DOI: 10.1520/JTE100559

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    Author
    Title Mechanical and Light Properties of Mangosteen Fruit as Related to Postharvest Quality
    Symposium , 0000-00-00
    Committee D10