Lipids can be also used in composite films to improve the films'
ability to control water transport. Epoxydized soybean oil (ESO),
virgin extra olive oil variety picual (OO) or lactic acid (LA) have been
added to SPI-based films in order to improve the hydrophobic
character of the films prepared by compression (Guerrero, Nur
Hanani, et al., 2011). Plastics containing castor oil exhibited
improved tensile strength and Young's modulus and storage
modulus under high humidity (75% RH), compared with neat
glycerol plasticized protein plastics (Tian et al., 2012). Similar results
were found while incorporating cinnamon or ginger essential
oils into soy protein matrix (Atares et al., 2010). Ginger oil made the
films less resistant to elongation and less stretchable although
lipideprotein interactions led to more resistant and stretchable
films in the case of cinnamon oil. Effects of the ratio of oleic acid to
stearic acid and ultrasonic/microwave assisted treatment on the
water vapor permeability (WVP) and contact angle of soy protein
isolate films showed that the prepared films (oleic acid: stearic
acid ¼ 2:3) had the lowest WVP value (0.1 1012 g cm1 s1 Pa1)
and highest contact angle value (135).
Lipids can be also used in composite films to improve the films'ability to control water transport. Epoxydized soybean oil (ESO),virgin extra olive oil variety picual (OO) or lactic acid (LA) have beenadded to SPI-based films in order to improve the hydrophobiccharacter of the films prepared by compression (Guerrero, NurHanani, et al., 2011). Plastics containing castor oil exhibitedimproved tensile strength and Young's modulus and storagemodulus under high humidity (75% RH), compared with neatglycerol plasticized protein plastics (Tian et al., 2012). Similar resultswere found while incorporating cinnamon or ginger essentialoils into soy protein matrix (Atares et al., 2010). Ginger oil made thefilms less resistant to elongation and less stretchable althoughlipideprotein interactions led to more resistant and stretchablefilms in the case of cinnamon oil. Effects of the ratio of oleic acid tostearic acid and ultrasonic/microwave assisted treatment on thewater vapor permeability (WVP) and contact angle of soy proteinisolate films showed that the prepared films (oleic acid: stearicacid ¼ 2:3) had the lowest WVP value (0.1 1012 g cm1 s1 Pa1)and highest contact angle value (135).
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