不同升温方式对烘干枣品质影响的研究

    Study on the Effect of the Different Heating Processes on the Quality of the Chinese Date

    • 摘要: 在红枣烘干工艺中,采用三种不同升温方式烘干的红枣,经95%乙醇浸提得膏后,以乙醚萃取,蒸发部分乙醚定容后,用GC-16APTF气相色谱仪以内加法测定糠醛和5-羟甲基呋喃甲醛的含量,水分、总糖和维生素C含量。结果表明,用前两种方法烘干的枣的品质比用第3种方法好。还讨论了红枣中糠醛和5-羟甲基呋喃甲醛的形成、测定及其对干枣品质的影响。

       

      Abstract: The amount of water, carbohydrate and vitamin C in a Chinese date dried in three different ways were measured quantitatively. Particularly the content of 2-furaldehyde and 5-hydroxymethyl-2-furaldehyde in the ethyl ether abstract from the same samples were determined by gas chromatography. The following three drying ways were utilized to bake Chinese dates: 1)to increase the temperature of the stove slowly to 55~60℃ during 6~8 hours, then to 68~70 ℃ during 8~10 hours, finally, to decrease temperature to 50 ℃ during 6 hours, the total baking time is 24 hours; 2) to increase the temperature of the stove slowly to 55~60 ℃ during 5~6 hours, then to keep this temperature for 10 hours and finally to decrease temperature to 50℃ during 3~4 hours, the total baking time is 20 hours; 3) to increase the temperature of the stove quickly to 65~68 ℃ during 3~4 hours, then to keep this temperature for 5~6 hours, finally, to decrease temperature to 50 ℃ during 5~6 hours, the total baking time is 18 hours, the quality of the date dried by the first way and the second is better than that by the third way. The formation, measurement of 2-furaldehyde and 5-hydroxymethyl-2-furaldehyde in date and their influences on the dry date were discussed.

       

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