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Role of carbon dioxide/oxygen permse...

Al-Ati, Tareq Abdullah.

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Role of carbon dioxide/oxygen permselectivity of ionomer films in modified atmosphere packaging of fresh-cut fruits.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Role of carbon dioxide/oxygen permselectivity of ionomer films in modified atmosphere packaging of fresh-cut fruits./
作者:	Al-Ati, Tareq Abdullah.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2002,
面頁冊數:	125 p.
附註:	Source: Dissertations Abstracts International, Volume: 63-10, Section: B.
Contained By:	Dissertations Abstracts International63-10B.
標題:	Food science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3037323
ISBN:	9780493504186

Role of carbon dioxide/oxygen permselectivity of ionomer films in modified atmosphere packaging of fresh-cut fruits.
Al-Ati, Tareq Abdullah.

Role of carbon dioxide/oxygen permselectivity of ionomer films in modified atmosphere packaging of fresh-cut fruits. - Ann Arbor : ProQuest Dissertations & Theses, 2002 - 125 p.

Source: Dissertations Abstracts International, Volume: 63-10, Section: B.

Thesis (Ph.D.)--Cornell University, 2002.

This item must not be sold to any third party vendors.

In order to understand the role of CO2/O2 permselectivity of polymeric films on modified atmosphere packaging (MAP) of fresh-cut fruit work was undertaken in 4 area: development of permeability apparatus, alter permselectivity of a polymer film, develop a mathematical model to accurately predict CO2 and O2 concentration change in a MAP system, and use an altered CO2/O2 permselectivity film in MAP of fresh-cut apples. The results indicated that thermal treatment of ionomers results in morphological and structural changes that affect gas permeability and permselectivity. It was found that annealing ethylene ionomers at 160°C reduced the CO2/O2 permselectivity from 4.1 to as low as 0.8. The reduced permselectivity is mainly caused by an increase in O 2 permeability from 3.4 Barrer to as high as 52.7 Barrer. Further investigation of the result reveals that such increase in O2 permeability was due to the increased O2 solubility. On the other hand, CO 2 solubility was increased only slightly. Modeling of package design using such low permselectivity film in a MAP of fresh-cut apples reveals the fact that permselectivity plays a crucial role in optimizing O2 and CO2 levels in a MAP of fresh-cut produce. The annealed ionomers with lower permselectivities than commercial films commonly used for MAP of fresh-cut produce produced O2 levels that was high enough to prevent anaerobic respiration, low enough to reduce respiration rate, and CO 2 levels that is higher than that produced by other films. The results suggest that the role of gas permselectivity cannot be completely overcome by modifying parameters related to the produce (e.g., weight) or package design (film area, thickness, free volume, etc.).

ISBN: 9780493504186Subjects--Topical Terms:

3173303
Food science.
Subjects--Index Terms:

Carbon dioxide

Role of carbon dioxide/oxygen permselectivity of ionomer films in modified atmosphere packaging of fresh-cut fruits.
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520 $a In order to understand the role of CO2/O2 permselectivity of polymeric films on modified atmosphere packaging (MAP) of fresh-cut fruit work was undertaken in 4 area: development of permeability apparatus, alter permselectivity of a polymer film, develop a mathematical model to accurately predict CO2 and O2 concentration change in a MAP system, and use an altered CO2/O2 permselectivity film in MAP of fresh-cut apples. The results indicated that thermal treatment of ionomers results in morphological and structural changes that affect gas permeability and permselectivity. It was found that annealing ethylene ionomers at 160°C reduced the CO2/O2 permselectivity from 4.1 to as low as 0.8. The reduced permselectivity is mainly caused by an increase in O 2 permeability from 3.4 Barrer to as high as 52.7 Barrer. Further investigation of the result reveals that such increase in O2 permeability was due to the increased O2 solubility. On the other hand, CO 2 solubility was increased only slightly. Modeling of package design using such low permselectivity film in a MAP of fresh-cut apples reveals the fact that permselectivity plays a crucial role in optimizing O2 and CO2 levels in a MAP of fresh-cut produce. The annealed ionomers with lower permselectivities than commercial films commonly used for MAP of fresh-cut produce produced O2 levels that was high enough to prevent anaerobic respiration, low enough to reduce respiration rate, and CO 2 levels that is higher than that produced by other films. The results suggest that the role of gas permselectivity cannot be completely overcome by modifying parameters related to the produce (e.g., weight) or package design (film area, thickness, free volume, etc.).
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