Poly(lactic acid) packaging modified curcumin as bioactive substance in tea drink (Camelia sinensis)

Abstract

The addition of curcumin with 0.5 % concentration resulted in poly(lactic acid) (PLA) packaging with the best antioxidant and antimicrobial activity was IC50 = 0.83 %. Antimicrobial showed positive inhibiting E. coli and B. cereus bacteria despite weak activity. The study of modified poly(lactic acid) packaging of curcumin in tea drink was better than commercial plastic packaging which carried out for 7 days. Antioxidant activity was IC50 = 4.37-16.36 % on the modified poly(lactic acid) curcumin packaging and antioxidant activity on commercial plastic was IC50 = 4.37-20.21 %. The increasing of total microbial log was lower (2.2-4.39) than commercial plastic (3.24-5.82) and total phenol reduction of 0.5 % was lower than commercial plastic packaging dropped by 0.0625 %.