高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (2): 20240424.doi: 10.7503/cjcu20240424

• 分析化学 • 上一篇    下一篇

近红外光谱用于DMSO衍生物抗冻过程中水结构分析

梁繁繁, 韩丽, 蔡文生, 邵学广()   

  1. 南开大学化学学院分析科学研究中心,天津市生物传感与分子识别重点实验室,药物化学生物学国家重点实验室,天津 300071
  • 收稿日期:2024-09-13 出版日期:2025-02-10 发布日期:2024-11-19
  • 通讯作者: 邵学广 E-mail:xshao@nankai.edu.cn
  • 基金资助:
    国家自然科学基金(22174075)

Understanding the Water Structures in Antifreezing of DMSO Derivatives by Near-infrared Spectroscopy

LIANG Fanfan, HAN Li, CAI Wensheng, SHAO Xueguang()   

  1. Research Center for Analytical Sciences,College of Chemistry,Tianjin Key Laboratory of Biosensing and Molecular Recognition,State Key Laboratory of Medicinal Chemical Biology,Nankai University,Tianjin 300071,China
  • Received:2024-09-13 Online:2025-02-10 Published:2024-11-19
  • Contact: SHAO Xueguang E-mail:xshao@nankai.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22174075)

摘要:

采用近红外光谱结合化学计量学方法, 研究了二甲基亚砜衍生物L-蛋氨酸亚砜[L-Met(O)-OH]抑制冰晶生长的分子机理. 通过小波包变换获得高分辨光谱, 对-5 ℃下不同浓度L-Met(O)-OH溶液在结冰过程中的近红外光谱进行分析, 提取出L-Met(O)-OH中S=O基团与冰相互作用的光谱信息, 结果表明, L-Met(O)-OH 有效抑制冰晶生长的主要原因是S=O基团与冰之间形成的氢键. 进一步在0 ℃条件下分析了不同浓度 L-Met(O)-OH溶液的高分辨光谱, 发现水分子与L-Met(O)-OH中的S=O和C=O基团相互作用的光谱特征, 在结冰过程中, 这些相互作用的光谱峰强度逐渐降低, 表明S=O和C=O基团与水分子的相互作用减弱, 并且在高浓度下减弱效果更加明显. 最后, 进一步研究了NH基团在抑制冰晶生长过程中发挥的作用, 发现在结冰过程中NH基团与水分子的结合逐渐增加, 形成了稳定的氢键网络, 这表明NH基团在整个结冰过程中始终与水保持相互作用, 而不与冰发生显著相互作用.

关键词: 近红外光谱, L-蛋氨酸亚砜, 抑制冰晶生长, 氢键

Abstract:

The molecular mechanism of L-methionine sulfoxide[L-Met(O)-OH], a derivative of dimethyl sulfoxide (DMSO), in inhibiting ice crystal growth was studied using near-infrared spectroscopy combined with chemometrics. High-resolution spectra were obtained through wavelet packet transform, allowing for a detailed analysis of the NIR spectra of L-Met(O)-OH solutions at various concentrations during the freezing process at -5 ℃. Spectral information regarding the interaction between the S=O group and ice was extracted. The results indicate that the primary reason for the effective inhibition of ice growth by L-Met(O)-OH is the formation of hydrogen bonds between the S=O group and ice. Further analysis of solutions at 0 ℃ revealed spectral features of interactions between water molecules and the S=O and C=O groups in L-Met(O)-OH. During the freezing process, the intensity of the spectral peaks associated with these interactions gradually decreased, indicating that the interactions between the S=O and C=O groups and water molecules weakened, and this weakening effect became more pronounced at higher concentrations. Finally, the role of the NH group in the inhibition of ice crystal growth was investigated. It was found that during freezing, the binding of NH groups to water molecules increased, forming a stable hydrogen-bonded network. The result indicates that the NH group consistently interacts with water throughout the freezing process and does not significantly interact with ice.

Key words: Near-infrared spectroscopy, L-Methionine sulfoxide, Ice crystal growth inhibition, Hydrogen bond

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