The effect of dried galangal powder and its ethanolic extracts on oxidative stability in cooked ground pork

Thiobarbituric acid-reactive substances (TBARS) value, peroxide value (POV), conjugated diene and hexanal content were used to evaluate the effectiveness of dried galangal powder and its ethanolic extracts to increase oxidative stability in cooked ground pork during storage at 5 °C for 14 days. Dried galangal powder (0.05%, 0.10% and 0.15% w/w) and its ethanolic extracts (0.17%, 0.43% and 0.51% w/w) significantly (P<0.05P<0.05) inhibited the formation of TBARS value, POV, conjugated diene and hexanal content in a dose-dependent manner where dried galangal powder at a concentration of 0.51% was the most effective; at the end of storage, TBARS values, POV, conjugated diene and hexanal content were 70.5%, 66.8%, 22.7% and 89.7%, respectively, less than the untreated sample. Addition of dried galangal powder to cooked ground pork was more effective than its ethanolic extract in controlling lipid oxidation. Furthermore, TBARS values and hexanal contents in cooked ground pork were highly correlated (r2=0.96r2=0.96; P<0.05P<0.05). These results suggest that the application of dried galangal powder and its ethanolic extracts could enhance oxidative stability of meat or other lipid containing food systems.