LABORATORY 4: PROTEIN ANALYSIS
LABORATORY 4: PROTEIN ANALYSIS OBJECTIVE 1.To determine protein concentration in various type of protein content 2.To determine protein concentration using two types protein assays that are Biuret assay and Lowry assay. I NTRODUCTION There are many ways to measure protein concentration; one of the common protocol is by measuring the absorbance of a coloured product formed by the protein and an organic molecule. Different methods can yield somewhat different results for the same protein as there is no absolute photometric protein concentration assay. All methods have advantages and disadvantages and a few aspects will be taken into consideration: specificity, sensitivity, the measurable range of concentration, the accuracy, the nature of the protein to be examined, the presence of materials interfering with the measurement, and the time required for the measurement. Biuret protein assay use biuret reagent that detect the presence of peptide bonds. When th...