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Updated: Jun 26, 2026

Development and Validation of an Ultrasensitive Single Molecule Array Digital Enzyme-linked Immunosorbent Assay for Human Interferon-α

Development and Validation of an Ultrasensitive Single Molecule Array Digital Enzyme-linked Immunosorbent Assay for Human Interferon-α

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[Interferon alpha-2b modified with polyethylene glycol].

Yingxin Wu¹, Yanqin Zhai, Jiandu Lei

¹National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China.

Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology

|January 24, 2009

Summary

This summary is machine-generated.

PEGylation of interferon alpha-2b with mPEG-ALD 20000 enhances its stability and prolongs its half-life. Optimized conditions yield a highly pure mono-PEGylated interferon alpha-2b with improved pharmacokinetic properties.

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Area of Science:

Biochemistry
Pharmacology
Biotechnology

Background:

Interferon alpha-2b (IFN alpha-2b) is a crucial therapeutic protein.
Enhancing the stability and half-life of IFN alpha-2b is essential for improved clinical efficacy.
PEGylation is a common strategy to modify protein properties.

Purpose of the Study:

To develop a more stable PEGylated interferon alpha-2b with a prolonged half-life.
To optimize the PEGylation reaction conditions for maximum bioactivity and PEGylation degree.
To characterize the properties of the mono-PEGylated interferon alpha-2b.

Main Methods:

Interferon alpha-2b was modified using monomethoxy polyethylene glycol propionaldehyde (mPEG-ALD) 20000.
Reaction conditions including buffer, protein concentration, PEG/IFN ratio, temperature, and time were optimized.
Ion exchange chromatography and High-Performance Liquid Chromatography (HPLC) were used for purification and characterization.

Main Results:

Optimized conditions yielded a mono-PEGylated interferon alpha-2b with a 55% PEGylation degree.
Purification resulted in >97% purity of mono-PEGylated interferon alpha-2b.
The modified protein exhibited 13.4% of native IFN alpha-2b bioactivity but a significantly longer half-life in rats and aqueous stability.

Conclusions:

The optimized PEGylation process successfully produced a stable mono-PEGylated interferon alpha-2b.
This modified interferon alpha-2b demonstrates improved pharmacokinetic properties, including extended half-life.
The findings suggest potential for enhanced therapeutic applications of PEGylated interferon alpha-2b.