Separation of Positional Mono-PEGylated Teriparatide Isomers Using Reverse-Phased Chromatography Assisted by Solubility Parameter Calculation
碩士 === 國立中央大學 === 化學工程與材料工程學系 === 101 === Teriparatide, a peptide drug for treating to osteoporosis by once-daily injection, is the 1-34 segment of recombinant human parathyroid hormone. However, Teriparatide is proteolytically instable in human serum resulting in short circulation half-life (less t...
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ndltd-TW-101NCU050630972015-10-13T22:34:51Z http://ndltd.ncl.edu.tw/handle/49558201281915593103 Separation of Positional Mono-PEGylated Teriparatide Isomers Using Reverse-Phased Chromatography Assisted by Solubility Parameter Calculation 利用逆相管柱層析並輔以溶解度參數計算進行聚乙烯二醇化人類副甲狀腺素位置異構物之分離 Wei-hung Kao 高偉紘 碩士 國立中央大學 化學工程與材料工程學系 101 Teriparatide, a peptide drug for treating to osteoporosis by once-daily injection, is the 1-34 segment of recombinant human parathyroid hormone. However, Teriparatide is proteolytically instable in human serum resulting in short circulation half-life (less than 1 hour). Therefore, conjugation with polyethylene glycol (PEGylation) to Teriparatide may shield it from proteolysis to prolong the circulation half-life. For the PEGylated Teriparatide, the positional isomers are usually formed with random PEGylation. We obtained the Nter-PEGylated and K13-PEGylated Teriparatide while the synthesis conditions using pH 6.0 and pH8.0 phosphate buffer, respectively. In this investigation, we intended to directly separate the isomers by tuning mobile phase pH in reversed-phase chromatography (RPC) operation. The results showed that the baseline separation of two isomers can be achieved by tuning the pH value of mobile phase from 7.0 to 9.0, and Nter-PEGylated Teriparatide is much retained in RPC. Form the solubility parameter measurement, we examined that the key factor for the separation of these two isomers is the polarity difference rather than hydrogen bonding or dispersion force. From the circular dichroism measurement, the K13- PEGylated Teriparatide with higher helixity shows less retained in RPC. The results are coherent with our previously proposed structure-retention relationships for peptide isomer retention prediction in RPC. Wen-yih Chen 陳文逸 2013 學位論文 ; thesis 78 zh-TW |
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碩士 === 國立中央大學 === 化學工程與材料工程學系 === 101 === Teriparatide, a peptide drug for treating to osteoporosis by once-daily injection, is the 1-34 segment of recombinant human parathyroid hormone. However, Teriparatide is proteolytically instable in human serum resulting in short circulation half-life (less than 1 hour). Therefore, conjugation with polyethylene glycol (PEGylation) to Teriparatide may shield it from proteolysis to prolong the circulation half-life. For the PEGylated Teriparatide, the positional isomers are usually formed with random PEGylation. We obtained the Nter-PEGylated and K13-PEGylated Teriparatide while the synthesis conditions using pH 6.0 and pH8.0 phosphate buffer, respectively. In this investigation, we intended to directly separate the isomers by tuning mobile phase pH in reversed-phase chromatography (RPC) operation. The results showed that the baseline separation of two isomers can be achieved by tuning the pH value of mobile phase from 7.0 to 9.0, and Nter-PEGylated Teriparatide is much retained in RPC. Form the solubility parameter measurement, we examined that the key factor for the separation of these two isomers is the polarity difference rather than hydrogen bonding or dispersion force. From the circular dichroism measurement, the K13- PEGylated Teriparatide with higher helixity shows less retained in RPC. The results are coherent with our previously proposed structure-retention relationships for peptide isomer retention prediction in RPC.
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Wen-yih Chen |
author_facet |
Wen-yih Chen Wei-hung Kao 高偉紘 |
author |
Wei-hung Kao 高偉紘 |
spellingShingle |
Wei-hung Kao 高偉紘 Separation of Positional Mono-PEGylated Teriparatide Isomers Using Reverse-Phased Chromatography Assisted by Solubility Parameter Calculation |
author_sort |
Wei-hung Kao |
title |
Separation of Positional Mono-PEGylated Teriparatide Isomers Using Reverse-Phased Chromatography Assisted by Solubility Parameter Calculation |
title_short |
Separation of Positional Mono-PEGylated Teriparatide Isomers Using Reverse-Phased Chromatography Assisted by Solubility Parameter Calculation |
title_full |
Separation of Positional Mono-PEGylated Teriparatide Isomers Using Reverse-Phased Chromatography Assisted by Solubility Parameter Calculation |
title_fullStr |
Separation of Positional Mono-PEGylated Teriparatide Isomers Using Reverse-Phased Chromatography Assisted by Solubility Parameter Calculation |
title_full_unstemmed |
Separation of Positional Mono-PEGylated Teriparatide Isomers Using Reverse-Phased Chromatography Assisted by Solubility Parameter Calculation |
title_sort |
separation of positional mono-pegylated teriparatide isomers using reverse-phased chromatography assisted by solubility parameter calculation |
publishDate |
2013 |
url |
http://ndltd.ncl.edu.tw/handle/49558201281915593103 |
work_keys_str_mv |
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