食品科学

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溶剂性质对番茄红素电子吸收光谱特征的影响

刘 蕊1,何强强2,惠伯棣2,*,宫 平2,刘沐霖1,魏建华1,王英明1   

  1. 1.新疆红帆生物科技有限公司,新疆 焉耆 841100;2.北京联合大学应用文理学院,北京 100191
  • 出版日期:2013-10-15 发布日期:2013-09-27
  • 通讯作者: 惠伯棣
  • 基金资助:

    “十一五”国家科技支撑计划项目(2008BAI58B06)

Effect of Solvent Properties on Electronic Absorption Spectral Characteristics of Lycopene

LIU Rui1,HE Qiang-qiang2,HUI Bo-di2,*,GONG Ping2,LIU Mu-lin1,WEI Jian-hua1,WANG Ying-ming1   

  1. 1.Xinjiang Tomato Red Co. Ltd., of Biological Science and Technology, Yanqi 841100, China;
    2. College of Applied Arts and Science, Beijing Union University, Beijing 100191, China
  • Online:2013-10-15 Published:2013-09-27
  • Contact: HUI Bo-di

摘要:

目的:探讨溶剂折射率、极化率和密度的变化对溶剂中番茄红素的最大吸收波长的频率(1/λmax),吸光系数(A1%1cm)和光谱精细结构(VIII/VII)的影响。方法:将番茄红素分别溶于乙腈-水体系和21种有机溶剂,配制成质量浓度为0.25μg/mL的样品溶液,于紫外-可见光分光光度计上采集其电子吸收光谱。结果:乙腈-水体系中的番茄红素光谱数据表明:当乙腈-水体系中的水体积分数从0上升到10%时,番茄红素的A1%1cm和VIII/VII值呈下降趋势,1/λmax无变化。当乙腈中的水体积分数上升到20%时,可见番茄红素聚集体的形成。21种有机溶剂中的番茄红素光谱数据表明:溶剂极化率、折射率和密度的下降可分别导致番茄红素的1/λmax、A1%1cm和VIII/VII值的下降。

关键词: 番茄红素, 电子吸收光谱, 最大吸收波长, 频率, 吸光系数, 溶剂, 极化率, 折光率, 密度

Abstract:

Objective: The aim of this study is to explore the effect of solvent refractive index, polarizability and density on lycopene maximum absorption frequency (1/λmax), absorption coefficient (A1% 1cm) and spectral fine structure (represented by VⅢ/VⅡ). Methods: Various sample solutions at 0.25 μg/mL were prepared with acetonitrile/water solutions and 21 organic solvents. The electronic absorption spectrum of each solution was acquired by a UV-Vis spectrophotometer. Results: Data from the spectral observations of acetonitrile/water solution suggested that an increased (from 0 to 10%, V/V) amount of water in acetonitrile could result in a reduced A1% 1cm and VⅢ/VⅡ, but had no influence on the maximum absorption frequency of lycopene. Additionally, 20% of water could result in aggregate construction of lycopene. Spectral data of lycopene in 21 organic solvents indicated that increased solvent polarizability, refractive index and density could reduce the maximum absorption frequency, A1% 1cm and VⅢ/VⅡ value of lycopene.

Key words: lycopene, electronic absorption spectrum, maximum absorption wavelength, frequency, absorption
coefficient,
solvent, polarizability, refractive index, density

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