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Determination of Malic Acid Using a Malate Dehydrogenase Reactor After Purification and Immobilization in Non-Denaturing Conditions and Staining with Ponceau S

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Mouse liver cytosolic malate dehydrogenase was separated by non-denaturing two-dimensional electrophoresis and identified. Furthermore, the activity of the enzyme was preserved even after separation, electroblotting onto a membrane and staining with Ponceau S in acidic buffer solution (pH 5.1). Using the membrane-immobilized enzyme, the malic acid content was estimated by measuring absorbance changes due to the conversion of nicotinamide adenine dinucleotide (NAD) to NADH. These results indicate that enzyme reactors can be systematically produced after purification, immobilization and staining with Ponceau S.

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Keywords: Enzyme reactor; Ponceau S; immobilization; malate dehydrogenase; malic acid; two-dimensional electrophoresis

Document Type: Research Article

Publication date: 2010-08-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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