US Government as Represented by the Secretary of the Army

Kenneth M Plummer

Abdul R Rahman

Glenn R Schafer

Wayne M Swantak

Treating lettuce for use in salads and the like to extend the storage life f said lettuce to at least about 4 weeks under refrigeration. The lettuce leaves are subdivided by cutting and treated with an aqueous solution of sodium meta bisulfite, citric acid, ascorbic acid, and potassium sorbate. Excess solution is removed from the cut lettuce, which then is enclosed in plastic bags made of vinylidine chloride-vinyl acetate copolymer film having low rates of transmission of oxygen, carbon dioxide, and water vapor. The plastic bags of treated cut lettuce are tightly closed to prevent intermixing of outside air with the interior atmosphere of the bags and the treated cut lettuce, and they are stored at about 1.7.degree. .+-. 1.0.

Growing community of inventors

Natick, MA, United States of America

Kenneth M Plummer