基于激光诱导击穿光谱技术的马铃薯中龙葵素及营养元素的检测

Determination of Solanine and Nutrient Elements in Potatoes by Laser-Induced Breakdown Spectroscopy

作为日常生活中常见的茎类蔬菜,马铃薯除了含有丰富的碳水化合物,还含有矿物质、叶黄素等对人体健康有益的活性物质。关于马铃薯表皮、果肉和芽中含有的营养元素和龙葵素的研究在食品安全和马铃薯质量评估方面具有重要意义。首先,利用激光诱导击穿光谱(LIBS)技术获得马铃薯表皮、果肉和芽的光谱,对马铃薯不同部位含有的营养元素和龙葵素进行分析;其次,观察不同部位的光谱中金属元素和非金属元素光谱峰强度的差异;最后,通过计算激光诱导等离子体温度和电子数密度,从局域热平衡条件和离子与原子密度比两个方面探讨产生这种差异的原因。结果表明,LIBS技术是分析马铃薯不同部位所含各种元素的一种可靠和有效的原位、在线测试方法。

As a common stem vegetable in daily life,potatoes not only contain rich carbohydrates but also contain minerals,lutein and other active substances beneficial to human health.Studies on the nutrients and solanine contained in the skin,flesh and sprout of potatoes are of great significance for food safety and potato quality assessment.First,the spectra of skin,flesh and sprout of potatoes are obtained by laser-induced breakdown spectroscopy(LIBS),and the nutrient elements and solanine in different parts of potatoes are analyzed.Second,the difference in spectral peak intensity between metallic and non-metallic elements in different parts of the potatoes is observed.Finally,the reason for the difference is discussed in terms of the local thermal equilibrium condition and the ratio of ion to atom densities by the calculation of the temperature and electron density of the laser-induced plasma.Results show that LIBS is a reliable and effective in situ and online test methods for the analysis of various elements in different potato parts.