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深圳大学·李连伟/管鑫:支化结构主导聚合物在液相色谱中的排阻-吸附(淀粉结构检测、指导淀粉改性应用)

  • 2026-05-09 12:32:48
深圳大学·李连伟/管鑫:支化结构主导聚合物在液相色谱中的排阻-吸附(淀粉结构检测、指导淀粉改性应用)

Starch+ I 单纯热爱

淀粉の最新工作解读

坚持阅读,用最精简的文字,完成三个目的

  1. 分享认真”的工作,科普有用”的知识;

  2. 提供课题idea、基金思路、组会素材

  3. 挖掘淀粉高值化开发的潜在工程策略

淀粉是一种天然的超支化大分子(支链淀粉)

该文结论对“ ↑ (它)” 有用!

作者在文章中也强调了将该文理论和理解挪用到淀粉研究中。

4分钟理解新方法

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第一作者

Zhu Mo

超支化聚合物在液相色谱中的排阻-吸附转变:受构型多样性与高分形维数支配

Macromolecules IF5.2

https://doi.org/10.1021/acs.macromol.5c03489

通讯作者 I 李连伟 - 深圳大学

支化高分子功能材料体系相关结构与表征

通讯作者 I 管鑫 - 深圳大学

软物质,胶体与界面化学

内容概述

通过精密的合成与色谱分析,揭示了超支化聚苯乙烯液相色谱临界条件(LCCC)下呈现出与线性聚合物截然不同的非普适性排阻-吸附转变行为,发现这种行为的根源在于超支化结构固有的高构型多样性高分形维数;这导致其分子内排除体积效应显著增强,在从排阻到吸附的转变过程中面临更高的构象能垒,从而打破了经典理论中基于高斯链模型的熵-焓补偿平衡。支化密度越高,这种偏离越明显,甚至使临界点吸附行为不复存在。

!

科普解读

这项研究揭示了像淀粉这类具有复杂树枝状结构的大分子在分离时的特殊行为。理解它,能帮助我们更精准地分析和改造淀粉,为开发更健康的食品或更环保的生物材料提供新思路。

科学/技术问题

为什么具有复杂支化结构的聚合物(如超支化聚合物)在液相色谱临界条件下的吸附行为,无法用描述线性链的经典理论来解释?

One-line “技术路线”

通过合成一系列支化密度精确可调的超支化聚苯乙烯,并构建含三唑环的线性聚合物作为化学参照,从而排除化学干扰,研究拓扑结构(支化密度、支链长度)对液相色谱临界条件下排阻-吸附转变行为的决定性影响。

亮点结论

1. 拓扑主导吸附:超支化聚合物的排阻-吸附转变行为不具有普适性,其共洗脱点强烈依赖于支化密度,与线性、环状聚合物的普适行为形成鲜明对比。

2. 支化密度效应:支化密度越高(支链越短),偏离线性链临界吸附行为越远,表现出更强的“抗吸附”能力,甚至在临界条件下仍以排阻模式为主。

3. 构型多样性放大:即使分子量相近的超支化样品,也包含多种拓扑异构体,它们在色谱柱内对熵-焓平衡的响应不同,导致色谱峰展宽甚至分裂

4. 化学干扰排除:强极性基团对临界吸附点的确定无显著影响,从而将观察到的特殊行为归因于拓扑结构本身。

产业启发

本研究建立的LCCC分析方法可用于精准分析不同来源淀粉的支化密度、支链链长分布; 理解支化结构如何影响分子在界面(如色谱柱填料)的吸附行为,可以指导对淀粉进行化学或酶法改性,以调控其与其它材料的相互作用,优化产品性能。

Graphical abstract

Scheme 1 聚合物合成路线与结构

Figure 1 LCCC分离模式示意图

Figure 2 窄分布样品SEC曲线

Figure 3 线性PS (无三唑) LCCC行为

Figure 4 线性PS (有三唑) LCCC行为

Figure 5  低支化度HB-PS的LCCC行为

Figure 6  中支化度HB-PS的LCCC行为

Figure 7 高支化度HB-PS的LCCC行为

Figure 8 支化度依赖性LCCC行为对比

Scheme 2 超支化链构型与构象示意

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  1. CONNECT:[ UseTime:0.001127s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001580s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000803s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000774s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001561s ]
  6. SELECT * FROM `set` [ RunTime:0.000586s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001534s ]
  8. SELECT * FROM `article` WHERE `id` = 513472 LIMIT 1 [ RunTime:0.001073s ]
  9. UPDATE `article` SET `lasttime` = 1778625844 WHERE `id` = 513472 [ RunTime:0.027832s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000790s ]
  11. SELECT * FROM `article` WHERE `id` < 513472 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002653s ]
  12. SELECT * FROM `article` WHERE `id` > 513472 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009748s ]
  13. SELECT * FROM `article` WHERE `id` < 513472 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002002s ]
  14. SELECT * FROM `article` WHERE `id` < 513472 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003644s ]
  15. SELECT * FROM `article` WHERE `id` < 513472 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003821s ]
0.235167s