thesis last version revised(N)10

تعداد124صفحه در فایل word

thesis last version revised(N)10

Alyssum homolocarpum based films incorporated with Ajowan(Trachyspermum ammi L.) essential oil at 10, 20 and 30% v/v were prepared to examine their antibacterial, antioxidant, physical, thermal, and mechanical properties. Extraction of the seed gum was determined using the method employed by Cui et al. (1994) with some modification. Fordistillation of Ajowan seeds, the method recommended in British Pharmacopoeia was used.  The physical and mechanical properties were determined in accordance with the ASTM standard methods.Addition of Ajowan essential oil affected the oxygen and water vapor permeability of the films. Incorporating AEO, increased color parameters and decreased lightness of films. A decrease of young modulus (YM) and tensile strength (TS) accompanied with an increase in elongation at break (% EB) was observed with increasing oil concentration. These films exhibited some antioxidant activity, which was significantly improved by the addition of the Ajowan essential oil. This incorporation influenced antimicrobial, antioxidant, physical, mechanical, barrier, microstructure and color properties of the films. The films prepared with Ajowan essential oil exhibited highest inhibition against E. coli and were more effective against Gram-negative bacteria (E.coli) than Gram-possitive bacteria (S. aureus). The results pointed out that the incorporation of ajowan essential oil as a natural antibacterial agent has potential for using the developed film as an active packaging.