“灵武长枣”的介电特性和内在品质的关系  

The Correlation Between Dielectric Properties and the Intrinsic Quality of ‘Lingwu long jujube'

作　　者：郭晓丹[1] 张海红[1] 周世平[1] 章中[1] 李海峰[1] 

机构地区：[1]宁夏大学农学院,宁夏银川750021

出　　处：《北方园艺》2014年第11期1-6,共6页Northern Horticulture

基　　金：国家自然科学基金资助项目(31160346);国家科技支撑计划资助项目(2012BAF07B00)

摘　　要：以宁夏地方特色农产品"灵武长枣"为研究对象,在货架期间利用LCR测试仪在特征频率223.8kHz(105.35 kHz)下测试了长枣并联等效电容(Cp)、电导(G)、阻抗相角(θ)、复阻抗(Z)等电学指标;并对与长枣的果皮破裂强度、脆度、果肉坚实度等物理力学品质指标和水分含量、可滴定酸含量、可溶性固形物含量等化学品质指标进行了比较分析,以筛选出相关性强的特征电学参数;在此基础上对电学参数与品质指标的变化规律进行了回归分析,以探讨基于介电特性的"灵武长枣"无损检测、品质评价的可行性。结果表明:"灵武长枣"的品质指标(果皮破裂强度、脆度、果肉坚实度、水分含量、可溶性固形物含量)与电学参数(Cp、G、θ、Z)具有很强的相关性,达到差异显著水平(P<0.05),对其品质指标所建立的电参数模型可有效预测长枣品质;利用"灵武长枣"的介电特性参数预测评价长枣的内在品质是可行的。Taking ‘Lingwu long jujube＇ as material,electrical indicators in shelf such as parallel equivalent capacitance （Cp）, conductance（G）,impedance angle（θ）,complex impedance（Z） were tested using the LCR tester in the characteristic frequency of 223. 8 kHz （10^5.35 kHz）, and analyzed comparatively with physic-mechanical indexes such as peel repute strength,brittleness and pulp firmness,and chemical quality indicators such as water content, titratable acid content and soluble solids content, highly correlated characteristic electrical parameters were selected; regression analysis of variation law of electrical parameters and quality indicators was conducted, the study was to explore the feasibility of dielectric properties based jujube fruit nondestructive testing and intrinsic quality evaluation. The results showed that correlation between jujube quality indicators （peel repute strength, brittleness, pulp firmness, moisture content, total soluble solids） and dielectric parameters （Cp,G,θ,Z） was high and reached a significant level （P〈0. 05）. Electrical parameter model established for jujube quality indicators could effectively predict long jujube quality. It＇s feasible to predict the inner quality of ‘Lingwu long jujube＇ by its dielectric characteristic parameters.

关 键 词：“灵武长枣” 介电特性 内部品质 

分 类 号：S665.1[农业科学—果树学]