Abstract
The effect of various concentrations of amyloid beta peptide (ABP) in different pH (pH 2, 6, 7, 8, 10) in aging at different time intervals was analysed using various techniques. The pH 7.4 and 8 were compared with other pH solution which indicated that the secondary structure content with high β-sheet conformation is found at pH 7.4 and 8. Phosphate buffer solutions (pH) were detected using CD spectroscopy. The CD spectra of peptide in phosphate buffer (pH 2 and 10) on aging at time intervals were also analysed with the aging of sample (pH 2) on the 10th day. The results showed no major secondary structural changes in the peptide, which was indicative predominant random coil structure. The phosphate buffer pH 6, 7.4, 8 on the 10th day showed the occurrence of crossover point. This same sample smear on slide was mounded and the fibrils were visualized using the light microscope. The percent of viable cell in different pH was detected in MTT (3-(4,5-Dimethyazol-2-yl)-2, 5-diphenyl-tetrazolium bromide) assay using human keratinocyte cell line (HaCaT). Fluorescence spectroscopy was used to study the growth and development of fibrils.
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