Abstract:
The objectives of this research were to develop production process and to investigate quality changes during storage of red-fleshed fresh-cut mangosteen. Effect of solvents, including water, 0.3% citric acid, 0.6% citric acid, 0.3% tartaric acid and 0.6% tartaric acid, on efficiency of anthocyanin extraction from dried mangosteen pericarp was conducted. It was found that the extraction using 0.6% tartaric acid resulted in the highest contents of anthocyanin, total phenolic compounds, proanthocyanin and antioxidant capacity (DPPH) in the extract. A subsequent study was carried out to assess the effect of dipping duration of half-peeled mangosteen in the anthocyanin extract at 10oC (1, 2 and 3 hours), prior to coating with 1% alginate on quality of the red-fleshed fresh-cut mangosteen. It was found that fresh-cut mangosteen dipped in the anthocyanin extract for 2 hours obtained the highest sensory scores in terms of color, taste, texture and overall liking. Thereafter, quality changes of the red-fleshed fresh-cut mangosteen packed in sealed polypropylene bag were observed during storage at 10oC for 15 days, compared with alginate-coated fresh-cut mangosteen and anthocyanin extract-dipped fresh-cut mangosteen. It was found that coating alginate on the surface of red-fleshed fresh-cut mangosteen effectively retarded respiration, increased total soluble solids content, and decreased redness value, total phenolic compounds content and antioxidant capacity during the storage. In addition, sensory quality, total bacteria, yeast and mold and lactic acid bacteria counts of the red-fleshed fresh-cut mangosteen were acceptable throughout 12 days of storage.
WALAILAK UNIVERSITY. CENTER FOR LIBRARY RESOURCES AND EDUCATIONAL MEDIA