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Development of Shelf Stable Tortillas for Space MissionsFlour tortillas are a favorite bread item for the Shuttle astronauts and have been used on most Shuttle missions since 1985. Spoilage problems were encountered with commercial tortillas on missions longer than 7 days. A shelf stable tortilla with a shelf life of 6 months was developed by modifying the formulation to reduce the water activity (a(sub w)) below 0.90 and packaging them in a reduced oxygen atmosphere. The water activity was reduced by substituting glycerin for some of the water in the basic tortilla formula. Reduction of the oxygen content was accomplished by packaging in a high-barrier container with a nitrogen atmosphere and including an oxygen scavenger in the package. Additional chemicals were added to the formula to lower the pH and further inhibit mold growth. The shelf life was verified by storage studies at 22 deg. C. The shelf stable tortillas have been well accepted by astronauts and have been used on eight Shuttle missions with durations beyond 7 days.
Document ID
19960021768
Document Type
Conference Paper
Authors
Bourland, Charles T.
(NASA Johnson Space Center Houston, TX United States)
Kloeris, Vickie L.
(NASA Johnson Space Center Houston, TX United States)
Fohey, Michael F.
(Lockheed Engineering and Sciences Co. Houston, TX United States)
Glaus-Late, Kimberly D.
(Lockheed Engineering and Sciences Co. Houston, TX United States)
Date Acquired
August 17, 2013
Publication Date
May 1, 1994
Publication Information
Publication: Dual-Use Space Technology Transfer Conference and Exhibition
Subject Category
Man/System Technology And Life Support
Accession Number
96N25043
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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