الفهرس 
Importance of apricotOnly 14 pages are availabe for public view
 |  | from | 183 |  |  |
| | | from | 183 | | |
Abstract
In South Sinai Governorate, Ras Sidr (32.7° N, 29.58° E), in July 2022, ex-perimental work was conducted using various kinds of solar dryers and hy-brid hot air and infrared dryer. Using pre-treatment (T1) ”untreated”, (T2)”dipping in sucrose syrup”, and (T3) ” dipping in Sodium bicarbonate” at drying air temperatures of 60, 70, and 80 °C at two different radiation intensi-ties (1.132 and 1.229 kW/m2) with a constant air velocity of 1 m/sec. Evalu-ate the effect of using solar dryers and hybrid dryer on quality of apricots, study the effect of pretreatment on the drying properties of apricot, decrease drying time and increase quality of dried apricots and determine the best dry-ing techniques and pre-treatments for maintaining the dried apricot’s maxi-mum quality characteristics (ascorbic acid, total soluble sugar, and beta ca-rotenoids) and color .The results show that the Lewis model is considered more proper for describing the drying behavior and predicting the changes in moisture content of apricot. The obtained results showed that treated apricot improved the quality of apricot. the best solar dryer was at black mesh shad-ing for (T3), because of the lowest value of ” browning index (BI) was 248.66 and color change (ΔЕ) was (53.428) and the highest value of ” lightness (L*), redness (a*), yellowness (b*), chrome (C) and hue angle (H°). The highest value was for ascorbic acid, total soluble sugar and beta carotenoids were 8.108 mg/100g, 0.474 mg/ml and 12.688 mg/100g. The best hybrid dryer was at infrared radiation intensity 1.132 k.m-2 for T2 at 80ºϹ because of the low-est value of browning index (BI) was 417.18 and color change (ΔЕ) was 13.91 and the highest value of redness (a*), Lightness (L*), yellowness (b*), chrome (C) and hue angle (H°) with the maximum value of ascorbic acid, total soluble sugar and beta Carotenoids 13.514 mg/100g, 0.537 mg/ml and 0.527 mg/100g.