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Taste Panel Studies of Flavor Levels in Sour Cream^{1, 2,}

Department of Animal Sciences, Purdue University Lafayette, Indiana 47907

ABSTRACT

The detection of and preference for cultured flavor levels in sour cream were studied using the triangular and paired preference tests. A total of 4,320 observations was made. The threshold for flavor in sour cream was determined by comparing control acidified cream with sour cream, cultured acidified cream, or acidified cream containing acetic acid and flavor concentrate. The apparent threshold for flavor perception in sour cream was 1.2 ml (milliliters of 0.1 n NaOH to titrate volatile acids from 50 g of samples) volatile acidity and 1 ppm diacetyl. Below these concentrations the panel could not differentiate between samples in the triangular test and above these concentrations the panel could identify the odd sample in the triangular test. The panel could not distinguish between different volatile acidity levels normally present in commercial sour cream (4 to 8 ml). When the difference in volatile acid content between samples was larger than 4 ml, significant triangular test results were obtained. Volatile acidity was considered to be a better indicator of total flavor in sour cream than was diacetyl.

Preference was shown by the consumer panel for samples containing diacetyl, volatile acidity, and associated flavor compounds over a bland flavored acidified cream (P < 0.001). Greatest preference between a control acidified cream and sour cream was indicated for sour cream containing 8 ml volatile acidity. When acidified creams containing 0, 2, 4, 6, or 8 mmoles acetic acid/kilogram plus flavor concentrate were ranked in order of preference, the samples containing 6 and 8 mmoles acid/kilogram plus flavor concentrate were preferred significantly over the average sample (P < 0.001).

¹ Published with approval of the Director of Purdue Agricultural Experiment Station as Journal Series Paper 3457.

² Partially supported by funds granted by the American Dairy Association, Chicago, Illinois.

³ Present address: Monsanto Company, St. Louis, Missouri.