Related Experiment Video
Updated: Aug 9, 2026

Targeting Cysteine Thiols for in Vitro Site-specific Glycosylation of Recombinant Proteins
Published on: October 4, 2017
Reaction pH and protein affect the oxidation products of beta-pentagalloyl glucose
1Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056, USA.
Abstract:
To better understand the biochemical consequences when polymeric polyphenols serve as biological antioxidants, we studied how reaction pH (pH 2.1-7.4) and protein affected the oxidation of pentagalloyl glucose (PGG) by NaIO4 in aqueous solution. PGG oxidation produced an o-semiquinone radical intermediate, which tended to form polymeric products at pH values below 5, and o-quinones at higher pH. The model protein bovine serum albumin promoted the formation of quinone even at low pH. Two other polyphenols, procyanidin (epicatechin16-(4-->8)-catechin) and epigallocatechin gallate, had similar pH-dependent oxidation patterns.
More Related Videos
Related Concept Videos
Oxidation of Alcohols
The process of oxidation in a chemical reaction is observed in any of the three forms:
Protein Modifications in the RER
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Protein Folding Quality Check in the RER
Oxidations of Aldehydes and Ketones to Carboxylic Acids
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation
The carbonyl center is activated by...
Radical Autoxidation

