Citation: Yun-zhu Wu, Zhi-huang Zhang, Xin Han, Jian Zhang, Wen-ming Zhang, Jun Yin. Affinity Switching for Lysozyme and Dual-responsive Microgels by Stopped-flow Technique:Kinetic Control and Activity Evaluation[J]. Chinese Journal of Polymer Science, ;2017, 35(8): 950-960. doi: 10.1007/s10118-017-1948-z shu

Affinity Switching for Lysozyme and Dual-responsive Microgels by Stopped-flow Technique:Kinetic Control and Activity Evaluation

Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, China

Corresponding author: Jun Yin, yinjun@hfut.edu.cn

^†

Received Date: 9 February 2017
Revised Date: 22 February 2017
Accepted Date: 7 March 2017

Fund Project: the National Natural Science Foundation of China 51673058

The use of proteins as therapeutics in nanomedicine is an emerging research field and has developed rapidly. However, proteins are always vulnerable to renal excretion or digestion by the proteolytic system in vivo, which limits their usage to a large extent. Although biocompatible polymers have been covalently linked to proteins to protect them from recognition by the immune system and prolong their circulation time, the biological activity of them is sometimes decreased. To fill this gap, physical isolation, wrapping, or encapsulation techniques are employed. Up to now, various mature examples were reported, but the whole time scales for guest molecules loading and releasing, especially the initial rapid loading process, were rarely mentioned. Herein, a series of dual-responsive poly(N-isopropylacrylamide-co-methacrylic acid) (P(NIPAM-co-MAA)) microgels were synthesized and employed to investigate the kinetics of in situ complexation and release of lysozyme under external stimuli modulation upon a stopped-flow apparatus, which was suitable for rapid dynamic monitoring. Close inspection of the adsorption kinetics during the early stages (<50 s) revealed that the initial microgel collapse occurred within~1 s, with more rapid transitions being observed when higher lysozyme concentrations were targeted. All the dynamic traces could be well fitted with a double exponential function, suggesting a fast (τ₁) and a slow (τ₂) relaxation time, respectively. Then, the kinetics of releasing bound lysozyme from microgels was carried on by utilizing the pH-responsive property, and the evaluation of the activity of released lysozyme was synchronously measured in a Micrococcus lysodeikticus (M. lysodeikticus) cell suspension. The corresponding relaxation time (τ) was also calculated by fitting the recorded dynamic traces. We speculate that this work can provide basic dynamics data and theoretical basis for microgels based nanocarriers to be used for protein delivery, controlled release, and possible chemical separation.
- Microgels,
- Stimuli-responsive,
- Lysozyme,
- Adsorption,
- Kinetics
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Affinity Switching for Lysozyme and Dual-responsive Microgels by Stopped-flow Technique:Kinetic Control and Activity Evaluation

References

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通讯作者: 陈斌, bchen63@163.com