The procedure of membrane separation and collagen extraction, presented in the
membrane, were investigated. Membranes were separated from the shell wall in a tank (15 L)
of water fitted with a mechanical stirrer. Membrane separation was enhanced by addition of
the elutant, EDTA at 5% w v-1. Optimum weight of eggshells was 500 g 15 L-1 aqueous
solution, with maximum yielding of the membrane about 8% of eggshells. Collagen was
extracted from the separated membranes with the addition of either of two organic acids, 0.5
M acetic or 0.5 M citric acid. Highest collagen yields of 507 and 495 mg 100g-1 dry sample
were obtained when acetic and citric acids relative to membrane weight were added at a ratio
of 1:8. Thermal solubility of collagen at 40 ºC was about 14.7 and 18.0 mg 100 g-1 dry
sample for water and 0.45 M NaCl solution, respectively. SDS-polyacrylamide gel
electrophoresis (SDS-PAGE) analysis of the collagen from eggshell membranes yielded type
1 collagen with α1 and α2 fibrils.
The procedure of membrane separation and collagen extraction, presented in themembrane, were investigated. Membranes were separated from the shell wall in a tank (15 L)of water fitted with a mechanical stirrer. Membrane separation was enhanced by addition ofthe elutant, EDTA at 5% w v-1. Optimum weight of eggshells was 500 g 15 L-1 aqueoussolution, with maximum yielding of the membrane about 8% of eggshells. Collagen wasextracted from the separated membranes with the addition of either of two organic acids, 0.5M acetic or 0.5 M citric acid. Highest collagen yields of 507 and 495 mg 100g-1 dry samplewere obtained when acetic and citric acids relative to membrane weight were added at a ratioof 1:8. Thermal solubility of collagen at 40 ºC was about 14.7 and 18.0 mg 100 g-1 drysample for water and 0.45 M NaCl solution, respectively. SDS-polyacrylamide gelelectrophoresis (SDS-PAGE) analysis of the collagen from eggshell membranes yielded type1 collagen with α1 and α2 fibrils.
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