EFFECT OF COOLING TEMERATURE AND DEFROSTING CYCLE ON DATE QUALITY DURING STORAGE
Date is the most important fruit in United Arab Emirates. The average per capita consumption is 35 kg. The objectives of this project were to investigate the effect of cooling temperature and defrosting cycle on date quality.Berhi dates at different ripening stage (Balah, Rutab and Tamr) were stored at different temperature (7, -7, -18, -25, and -30℃). Defrosting cycle were set at 6, 24 and 72 hours for (-25℃) freezers. Quality parameters were determined for fresh date and date stored for 1, 3, 6, 9 and 12 months.For different ripening stage of dates there were significant temperature x storage and defrosting cycle x storage interactions for moisture content, water activity, ascorbic acid and sensory attributes. Moisture content and water activity were slightly affected by storage temperature and defrosting cycles while ascorbic acid decreased significantly during storage for all the storage temperatures and defrosting cycles. Sensory attributes had similar pattern, dates at different ripening stages developed darker color, sweeter taste, more date flavor and softer texture.Refrigerated and frozen Tamr stored for 12 months had similar ratings for overall acceptance. Balah and Rutab stored for 12 months at -25℃ at 72 hours defrosting cycle retained more ascorbic acid and had the highest ratings for overall acceptance. Tamr should be stored at refrigeration temperature while Balah and Rutab should be stored at -25℃ with 72 hours defrosting cycle to preserve its quality.
I.HASHIM O.SIPAHIOGLU YY.HWANG
United Arab Emirates University, P. O. Box 17555,Al Ain, United Arab Emirates LG Electronics, P. O. Box 641-711, Changwon city, Korea
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）