Orexin-A pegylation modifier and preparation method thereof
A PEGylation and polyethylene glycol technology, applied in the field of medicinal chemistry, can solve the problems of restricting the development and application of orexin-A, instability of orexin-A, etc., and achieve the effects of good product uniformity and simple separation and purification
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[0017] Example 1
[0018] The preparation method of orexin-A pegylated modified substance includes the following steps:
[0019] (1) Weigh 10mg of orexin-A, dissolve it in 10ml of PB buffer (10mM, pH=6), then add monooxypolyethylene glycol propionaldehyde (molecular weight: 5000Da) at a molar ratio of 1:10 And mix well, put it at 25℃ to react for 6 hours and then terminate the reaction;
[0020] (2) Pass the reaction solution of step (1) through a SepHadex G-25 column for desalting, and load the protein collected after desalting on a QAE-SepHadex A-50 anion exchange column, eluting with 10mM PB buffer, The elution peaks are collected, concentrated and freeze-dried to obtain orexin-A pegylated modification.
Example Embodiment
[0021] Example 2
[0022] The preparation method of orexin-A pegylated modified substance includes the following steps:
[0023] (1) Weigh 10mg of orexin-A, dissolve it in 10ml of PB buffer (10mM, pH=7), then add monooxypolyethylene glycol propionaldehyde (molecular weight: 5000Da) at a molar ratio of 1:20 And mix well, put it at 25℃ to react for 5 hours and then terminate the reaction;
[0024] (2) Pass the reaction solution of step (1) through a SepHadex G-25 column for desalting, and load the protein collected after desalting on a QAE-SepHadex A-50 anion exchange column, eluting with 10mM PB buffer, The elution peaks are collected, concentrated and freeze-dried to obtain orexin-A pegylated modification.
Example Embodiment
[0025] Example 3
[0026] The preparation method of orexin-A pegylated modified substance includes the following steps:
[0027] (1) Weigh 10mg of orexin-A, dissolve it in 10ml of phosphate buffer (10mM, PH=8), then add monooxypolyethylene glycol propionaldehyde (molecular weight: 5000Da) at a molar ratio of 1:30 ) And mix well, and stop the reaction after 4 hours in the dark at 25°C;
[0028] (2) Pass the reaction solution of step (1) through SepHadex G-25 column for desalting, load the protein collected after desalting on QAE-SepHadex A-50 anion exchange column, and elute with 10 mM PB buffer , Collect the elution peaks, concentrate and freeze-dry to obtain orexin-A pegylated modification.
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