In order to study the relationship between freshness degree and dielectric properties of Lingwu long jujube, the dielectric properties parameters of long jujube were measured using (LCR)on 1.995 kHz, and the correlation analysis between dielectric properties parameters and quality parameters was conducted. The results indicated that correlations between long jujube’s dielectric loss factor ε″ and soluble solids content, hardness, weight loss, titratable acids content & MDA content were very significant (P<0.01), and the correlation between relative dielectric constant ε′ and respiration intensity was very significant (P<0.01). The long jujube were divided into three freshness grades according to the change rules of soluble solids content, hardness and weight loss rate. Using dielectric loss factor ε″ as the input characteristic parameters,the prediction model of long jujube freshness was established by BP neural network structure. The average distinguishing rate of freshness grades was 81.67%. The results indicated that the freshness degree of long jujube could be predicted by dielectric properties parameters.

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[1] 周禹含, 毕金峰, 陈芹芹, 等. 中国红枣加工及产业发展现状[J]. 食品与机械, 2013, 29(4): 214-217.
[2] 徐爽, 何建国, 易东, 等. 基于高光谱图像技术的长枣糖度无损检测[J]. 食品与机械, 2012, 28(6): 168-170.
[3] Liu Yan-de, Ying Yi-bin. Optical nondestructive inspective inspection of chicken-egg freshness[J]. Transactions of The Chinese Society of Agricultural Engineering, 2003, 19(5): 152-155.
[4] 刘文超, 廖宇兰, 崔万春, 等. 基于介电特性的水果无损检测技术的应用分析[J]. 食品研究与开发, 2011, 32(6): 90-93.
[5] 张立彬, 胥芳, 周国君, 等. 苹果的介电特性与新鲜度的关系研究[J]. 农业工程学报, 1996, 12(3): 186-190.
[6] 柯大观, 张立彬, 胥芳. 基于介电特性的水果无损检测系统研究[J]. 浙江工业大学学报, 2002, 30(5): 446-450.
[7] 秦文, 羽仓义雄, 铃木宽一, 等. 胡萝卜贮藏过程中电容与新鲜度的关系研究[J]. 农业工程学报, 2005, 21(9): 160-162.
[8] 马涛, 李海峰, 张海红. 樱桃番茄采后品质变化的介电特性研究[J]. 食品研究与开发, 2013, 34(21): 107-111.
[9] Nelson S O, Forbea W R, Lawrence K C. Peanittivities of fresh fruits and vegetables firm 0.2 to 20 GHz[J]. Journal of Microwave Power and Electromagnetic Energy, 1994, 29(2): 81-83.
[10] 李里特. 食品物性学[M]. 北京: 中国农业出版社,1996: 286-288.
[11] 马雪莲. 采后灵武长枣电学特性和生理特性关系的研究[D]. 宁夏: 宁夏大学, 2015: 10-14.
[12] 王慧倩, 张海红, 周世平, 等. 基于介电特性的枣果品种识别研究[J]. 食品科技, 2014, 39(7): 304-308.
[13] Soltani M, Alimardani R, Omid M. Evaluating banana ripening status from measuring dielectric properties[J]. Journal of Food Engineering, 2011, 105: 625-631.
[14] 周世平. 灵武长枣贮藏过程中介电特性与品质变化的相关性研究[D]. 宁夏: 宁夏大学, 2014: 9-14.
[15] 许铭强, 陈恺, 张艳艳, 等. 干制温度对枣果实质构性能的影响[J]. 食品与机械, 2012, 28(5): 59-70.
[16] 谭谊谈, 曾凯芳. 鲜切果蔬酶促褐变关键酶研究进展[J]. 食品科学, 2011(17): 376-379.
[17] 任雪梅, 王文特, 田洪芸, 等. 比色法测定鸭油中的丙二醛[J]. 山东农业科学, 2014, 46(1): 117-119.
[18] 赵梅霞, 闫师杰, 肖丽霞, 等. 红外CO2分析器测定果实呼吸强度参数初探[J]. 现代仪器, 2005(2): 30-32.
[19] 颉敏华, 吴小华, 李国峰, 等. 灵武长枣呼吸特性研究[J]. 保鲜与加工, 2008(3): 28-30.
[20] 郭晓丹, 张海红, 周世平, 等. “灵武长枣”的介电特性和内在品质的关系[J]. 北方园艺, 2014(11): 1-6.

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