Abstract:
Chitosan is a bio-polymer extracted from shrimp and crab shells. Effect of chitosan can be inhibit bacteria and decrease transpiration, which is decreasing the molecular weight with gamma irradiated. It is applied for bio-chemical solution for coating duck eggs. This thesis has study about effect of concentration and molecular weight of chitosan at concentration 0.5, 1.0, 2.0 and 5.0%, respectively. Molecular weight 823, 668, 377, 130, 36.7 and 28.1 kDa(5.0% concentration are only in molecular weight 130, 36.7 and 28.1 kDa), respectively. all of chitosan were solute in acetic acid 1.0% v/v and using dip method for coating the duck eggs and storage for 8 weeks at room temperature. The results showed the concentration 5.0% and molecular weigh 28.1 kDa is the best for reduce weight loss. Result for haugh unit measurement showed the concentration 1.0% and most of molecular weight can maintained the quality A grade in first week and reduce to B grade in second week. However, after second week the haugh unit were not different of significant in each conditions for changing quality grade. Summary, optimum time storage time of duck eggs is 5 weeks after coating with chitosan while the control can storage only 3 weeks.