บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Gas transmission characteristics of different films used for packaging intact and minimally processed fruits and vegetables.

Artes, F.; Martinez, J. A.;

14th International congress on plastics in agriculture, Tel Aviv, Israel, March 1997. Year: 1998 Pages: 481-486 Ref: 10 ref.

1998

บทคัดย่อ

Gas transmission characteristics of different films used for packaging intact and minimally processed fruits and vegetables.

Unperforated polyvinyl chloride (PVC), polypropylene (PP) and low density polyethylene (LDPE) are commonly used films for conditioning fresh intact and minimally processed respiring foods. Based on the isostatic method, the permeabilities to oxygen (PO2) and carbon dioxide (PCO2), the Arrhenius constant and the activation energy (Ea) of permeation of some PP, PVC and LDPE films, manufactured in Spain, were determined at 2, 12 and 20 deg C and 90% relative humidity. A low Ea was detected in LDPE and particularly in PVC. Changes in temperature during the marketing process slightly affected LDPE and PVC gas permeabilities. Selectivity (PCO2/PO2) of the studied polymers, which is considered one of the most important parameters in the design of packages for respiring foods, ranged from 2.2 to 4.5 at 2 deg C and from 2.4 to 4.3 at 20 deg C. Consequently, these films are very suitable for making packages for modified atmosphere storage of fresh fruits and vegetables. In spite of their low Ea, PVC and L

DPE can be recommended for conditioning commodities with a relatively high Q10 (temperature coefficient) in order to avoid risks of fermentation due to their high PO2 and PCO2 at 2-20 deg C. On the other hand, PP may be considered advantageous for generating favourable modified atmospheres for commodities with a moderate to low Q10, due to its relatively low PO2 and PCO2 and high Ea.