Wang Rongrong, Ding Shenghua, Zhao Dandan, Wang Zhengfu, Wu Jihong, Hu Xiaosong
1College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083 China.
National Engineering & Technology Research Center for Fruits and Vegetable Processing, Beijing, 100083 China.
Food Sci Biotechnol. 2016 Feb 29;25(1):137-143. doi: 10.1007/s10068-016-0021-y. eCollection 2016.
Changes in antioxidant activities, phenolic contents, cyclic nucleotides, and volatiles of jujube after dehydration using freeze-drying (FD), air drying (AD), sun drying (SD), and microwave drying (MD) were investigated. All dehydration methods caused a decrease in antioxidant activities, aldehyde, acid, and alkane contents. Esters were increased by the dehydration. FD was superior to other dehydration methods for retention of total phenolics, total flavonoids, and antioxidant activities. MD caused an increase of catechin and epichtechin levels. Although AD, MD, and SD caused declines in cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) contents, AD at 50oC was a good choice to obtain jujubes with high levels of cAMP and cGMP. Theoretical fundamentals for selection of suitable drying techniques to minimize the negative effects caused by dehydration and for meeting production requirements are provided.
研究了采用冷冻干燥（FD）、热风干燥（AD）、日晒干燥（SD）和微波干燥（MD）对枣进行脱水处理后，其抗氧化活性、酚类物质含量、环核苷酸和挥发性成分的变化。所有脱水方法均导致抗氧化活性、醛类、酸类和烷烃含量降低。脱水处理使酯类含量增加。在保留总酚、总黄酮和抗氧化活性方面，冷冻干燥优于其他脱水方法。微波干燥使儿茶素和表儿茶素水平升高。虽然热风干燥、微波干燥和日晒干燥导致环磷酸腺苷（cAMP）和环磷酸鸟苷（cGMP）含量下降，但50℃的热风干燥是获得高cAMP和cGMP含量枣的良好选择。本研究为选择合适的干燥技术以最小化脱水造成的负面影响并满足生产要求提供了理论基础。
