Author
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Perkins Veazie, Penelope |
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Submitted to: HortScience
Publication Type: Abstract Only Publication Acceptance Date: 1/10/2003 Publication Date: 4/10/2003 Citation: PERKINS VEAZIE,P.M., STORAGE REGIMES AND ORAC IN MUSCADINE GRAPES, HORTSCIENCE, 2003. Interpretive Summary: Technical Abstract: Muscadine grapes are usually slip-skin types with large seeds and are light green-bronze or purple-black in color. These grapes are grown in the southern part of the U.S. and are most often used for processed products. Fresh market studies with muscadines have been done to determine the ideal stages of ripeness and use of sulfur dioxide for shelf life extension. The objectives of our work have been to determine alternative storage regimes for muscadines and to determine their antioxidant content. `Fry' and `Summit' (bronze) grapes harvested at 16% soluble solids content and held at 2 C for 28 days had 20-40% less decay under a controlled atmosphere of 15% CO2/10% O2. Little to no change was seen in soluble solids content, pH, or titratable acidity. However, UV-C (254 nm) treatment (2000J) of `Carlos' and `Cowart' muscadines did not decrease the percentage decayed or soft berries, or change the pH or titratable acidity of the fruit. The oxygen radical absorbing capacity (ORAC) of muscadines was found to be very high. Values of 28-49 and 32-68 umol Trolox equiv./g fresh weight were found in seven bronze and 11 purple muscadine varieties, respectively. These results indicate that controlled atmosphere storage of muscadines may offer a means of extending shelf life, and that muscadines may be a rich source of antioxidants. |
