Its universality, high precision and good reproducibility have made it the major method for the estimation of protein in foods. Protein estimation assays, also known as Protein quantification assays or protein quantitiation assays, for determining protein concentration are one of the most widely used methods in life science research. Links to PubMed are also available for Selected References. The Kjeldahl method is widely used internationally and is still the standard method for comparison against all other methods. • Protein assays are one of the most widely used methods in life science research. Aim: To estimate the protein using Biuret method. Methods used to measure total protein Refractometry . Kjeldahl Method. Disadvantages.
• Estimation of protein concentration is necessary cell biology, molecular biology and other research applications. Biochemistry. BACKGROUND. Protein estimation of protein concentration is necessary in protein purification, electrophoresis, cell biology, molecular biology, and other research applications. Full text Full text is available as a scanned copy of the original print version. • Is necessary before processing protein samples for isolation, protein purification, separation and analysis. Many methods of protein analysis respond differentially to different proteins and present problems when applied to specimens of varying protein composition. Reagents Required: 1. The Lowry method is reasonably sensitive, and the sensitivity is moderately constant Get a printable copy (PDF file) of the complete article (1.2M), or click on a page image below to browse page by page.
Estimation of protein by Folin Lowry method. Quantitative estimation of proteins by Lowry assay: Principle: In the past this has been the most commonly used method for determining protein concentration, although it is tending to be replaced by the more sensitive methods described below. It measures the refractive index of a sample relative to the refractive index of water. The interaction between bio molecules is crucial for knowing their function. Therefore, it is important to know the total protein concentration that includes both active and inactive forms of protein. This method is rarely used in clinical laboratories but is of historical importance and is sometimes used as a reference method. Principle: The –CO-NH- bond (peptide) in polypeptide chain reacts with copper sulphate in an alkaline medium to give a purple colour which can be measured at 540 nm. But the presence of the protein impurities can highly affect the result.
This method is used for estimating plasma protein (including fibrinogen) in EDTA plasma and is reported on routine hemograms at Cornell University. Estimation of Protein by Biuret Method Dr. Mahesha H B., Yuvaraja’s College, University of Mysore, Mysore. Experiment (2).
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