104C-3 |
Content of total phenolics and dietary fibers in parts and some cultivars of Asian pears (Pyrus pyrifolia) |
X. Zhang1, J. B. EUN2, S. H. Choi1, J. S. Kim3, and C. S. Na3. (1) Food Science & Technology, Chonnam National University, 300 Yongbong-Dong, Buk-Gu, Gwangju, 500-757, South Korea, (2) Dept. of Food Science & Technology, Chonnam National Univ., 300 Yongbong-dong Buk-gu, Gwang-ju, 500-757, South Korea, (3) College of Oriental Medicine, Dongshin University, Chonnam, Naju, 520-714, South Korea When Asian pears were damaged, the marketability of Asian pears as fresh fruit is significantly suffering. Therefore, in this study some cultivars and parts of the pears were analyzed for investigating the content of total phenolics and dietary fibers, which can be used for functional ingredients or nutraceuticals. The cultivars of Asian pears (Pyrus pyrifolia) were Changsibrang, Shingo, Kumchonchu, and Mansamgil and the peel and the flesh of fruits of the cultivars were analyzed. The content of total phenolics was determined by the method of Folin-Denis and insoluble and soluble dietary fibers (IDF and SDF) was measured by enzymatic gravimetric method by Prosky et al. The content of neutral detergent and acid detergent fibers (NDF and ADF) was analyzed by the method of Van Soest and lignin content was determined by the method of Tappi. The content of cellulose was calculated by substracting lignin from ADF and hemicellulose by doing ADF from NDF. In total phenolics, the peels of Shingo and Mansamgil had higher content than in the peels of Kumchonchu and Changsibrang. The flesh of Kumchonchu had higher content than in the flesh of Changsibrang. In dietary fibers, the peel of Shingo had the lowest content of IDF, NDF and hemicellulose. The peel of Kumchonchu had the highest content of lignin. The peel of Mansamgil had the highest content of ADF and cellulose. The flesh of Mansamgil had the lowest content of IDF, SDF and lignin. The flesh of Kumchonchu had the highest content of hemicellulose. The flesh of Mansamgil had the highest content of cellulose. The content of dietary fibers except for hemicellulose was highger in the peel than in the flesh. In conclusion, the peel of the pears, a by-product when processed to make juice, could be a good source to produce functional ingredients or nutraceuticals.
Session 104C, Fruit & Vegetable Products: Vegetables (Processed)
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