Abstract
We have developed a simple route for the preparation of aminophenylboronic acid polymer nanoparticles (APB PNs) from 3-aminophenylboronic acid and formaldehyde under alkaline conditions according to an extended Stӧber method. Insulin and R6G have been selected to prepare functional insulin-APB PNs and R6G-APB PNs, respectively. During the formation of APB PNs, the representative molecules are embedded inside the APB PNs. Through specific binding of glucose with boronic acid moieties on the R6G-APB PNs and insulin-APB PNs, glucose induces expansion of the APB PNs, leading to release of R6G and insulin molecules, respectively. As a result of release of R6G molecules, the fluorescence intensity of R6G-APB PN solution increases, allowing quantitation of glucose in PBS solutions (10 mM, pH 7.4) with a linear range over 0–10 mM. Release of insulin from insulin-APB PNs is significant and rapid when the glucose concentration is higher than 7 mM. Having advantages of low cost, simple preparation, biocompatibility, and continuous response to glucose, the insulin-APB PNs hold great potential as an alternative for treating diabetic patients.
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Acknowledgments
The authors gratefully acknowledge the Ministry of Science and Technology (MOST) of Taiwan for providing financial support for this study under contracts NSC 104-2113-M-002-008-MY3 and 104-2815-C-002-118-M. The authors thank Chia-Chuan Cho and Professor Hung-Wen Li from the Department of Chemistry, National Taiwan University, for their help with fluorescence microscopy. Also, the assistances of Ms. Ya-Yun Yang and Ms. Ching-Yen Lin from the Instrument Center of National Taiwan University (NTU) for TEM measurement is appreciated.
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All volunteer blood donors who are from this lab have given written informed consent for use of their samples. The experiments were conducted in accordance with ethical standards.
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Hsieh, HH., Ho, LC. & Chang, HT. Aminophenylboronic acid polymer nanoparticles for quantitation of glucose and for insulin release. Anal Bioanal Chem 408, 6557–6565 (2016). https://doi.org/10.1007/s00216-016-9842-z
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DOI: https://doi.org/10.1007/s00216-016-9842-z