温州蜜柑和椪柑橘络主要矿质元素含量的比较分析

Comparative Analysis of Several Mineral Elements Contents in Vascular Bundle of Satsuma Mandarin and Ponkan Mandarin Fruit

橘络是位于柑橘果实中果皮与内果皮之间的维管束系统,主要起着营养物质和水分在果肉与果皮间转运的功能。橘络不仅在柑橘果实采前发育和采后枯水病发生过程中起重要作用,还是一种重要的中药资源,具有多种功效。本研究对温州蜜柑和椪柑橘络的外观形态与含水量进行分析,并利用火焰原子吸收光谱法对橘络的主要矿质元素(钾、钙、镁、铜、锌)含量进行测定,经过初步讨论,结果表明:(1)椪柑中橘络的含水量(63.57%±1.53%)显著低于温州蜜柑70.25%±0.24%,果肉含水量也呈现类似趋势。(2)橘络富含钾、钙、镁元素,浓度分别为:3 525~6 495,6 866~9 430,3 94~632mg·kg^(-1)干重;铜、锌元素含量分别为1.5~2.3和8.5~14.7mg·kg^(-1)干重。(3)橘络钾、钙、镁、锌元素含量在椪柑中明显高于温州蜜柑。本研究首次揭示了橘络矿质元素的含量特征,并发现矿质元素的含量变化与果实含水量具有相关性,为进一步研究枯水病的发生机理提供了重要借鉴;同时也为开发橘络这一宝贵的中药资源奠定了理论基础。

Vascular bundle of Citrus fruit is the tissue between citrus albedo and segment epidermis, mediating the nutrients and water transport between flesh and rind. Such vascular bundle is well-known traditional Chinese medicine with multiple curative effects. The present study was performed to analyze the morphology and relative water content of the vascular bundle of Citrus fruit, and further the atomic absorption spectrometry was employed to elucidate several mineral elements contents （K, Ca, Mg, Cu, Zn） in vascular bundle of mandarin and Ponkan mandarin fruit. After brief discussion, several conclusions was made as follows： （1） Relative water content of the vascular bundle was （63.57±1.53%） in Satsuma mandarin, which was much lower than that in Ponkan mandarin （70.25%±0.24%）. （2） Content of K, Ca, Mg in vascular bundle was 3 525-6 495, 6 866- 9 430, 394-632 mg · kg-1 , respectively in terms of dry weight. Concentration of Cu and Zn in the vascular bundle was 1.5- 2.3 and 8.5-14.7 mg· kg-1 , respectively in terms of dry weight. （3） Content of K, Ca, Mg, Zn was relatively higher in vas- cular bundle of Ponkan mandarin than that of Satsuma mandarin. The present results suggested a well correlation between mineral elements contents in vascular bundle and the water content of fruit, contributing to further research of section-drying in Citrus fruits, as well as deep utilization of this promising resource.