Thesis

Life cycle testing on canned tomato paste : correlating subjective to objective testing methods

Canned tomato paste was examined to determine its' life cycle. Life cycle information can be used to predict the shelf-life of the product. The product was stored at 113, 100, 85, 72 and 38°F for up to three years. The product was analyzed by two subjective testing methods: preference - hedonic evaluations and descriptive - trained profile panel analysis and three objective testing methods: serum color, hydroxymethylfurfural content and colorimeter values. Two separate studies were conducted to check the repeatability of the data. The descriptive sensory analysis provided better information than did the preference evaluation on the rate of the product's deterioration. Significant correlations at the 0.01 level were found for all subjective and objective analyses, but only a few had correlation coefficients of above 0.800. The best correlation was between the descriptive panel and serum color analysis. The data showed good repeatability when the differences in the initial values between the studies were taken into consideration. The product has a Q10 of 3.0-3.8, a shelf-life of 21-38 months at 25°C and an Ea of 18-23 K cal/mole.

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