Yield
Yield has been calculated for shrimp waste, chitin and chitosan. Waste from the fresh shrimp was found to be 45%. The yield obtained here found to be within the range reported by Lertsutthiwong et al. (2002) who showed that waste content varied approximately from 45 to 55% of the weight of raw shrimp. Yield of chitin extracted in this study from shrimp waste varied from 13.12% to 17.36% depending on concentration of HCI used during different treatments. This is due to lower concentration of HCI could not remove minerals from shrimp shell and subsequently increased the yield. Chitosan yielded in this study was 15.40% (Table 4), which was higher than that reported by Brzeski (1982) (14% yield of chitosan from krill). On the other hand, the yield was lower than those reported by Alimuniar and Zainuddin (1992) who reported 18.6% yield from prawn waste and No and Meyers (1989) who obtained approximately 23%. Chitosan yield in this research is relatively lower. This might be due to depolymerization of the chitosan polymer, loss of sample mass/weight from excessive removal of acetyl groups from the polymer during deacetylation and loss of chitosan particles during washing.