Masters Theses

Date of Award

8-1972

Degree Type

Thesis

Degree Name

Master of Science

Major

Food Science and Technology

Major Professor

Grayce E. Goertz

Committee Members

Ada Marie Campbell, J. L. Collins

Abstract

Thermal conductivity and diffusivity of ground turkey pectoralis secundus muscle were investigated using a line-source apparatus modified to allow determinations upon the sample during transient heating. Samples (51.5g) were heated in a water jacketed cylinder at and to end points of 77, 95, 113, 131, 149, 167, and 185oF and subjected to holding times of 0 or 15 min. The relationship between thermal properties and moisture factors including total moisture, cooking loss, and expressible moisture index was investigated.

Thermal conductivity values were similar for samples heated at and to temperatures between 77 and 167oF but tended to decrease for those at 185oF. Holding times did not affect thermal conductivity values. There tended to be close agreement among values for a given end point and these were within ranges reported in the literature.

Total moisture gradually decreased for turkey heated to temperatures that ranged from 77 to 149oF. Thereafter a pronounced decrease in total moisture occurred as end points increased. A significant increase in cooking loss was noted between samples heated to 77 and 95oF (P < 0.001) , to 113 and 131oF or 149oF (P < 0.01) , and to 149 < 167 < 185oF (P < 0.05) . Expressible moisture indexes for 77 and 95oF samples were similar and decreased slightly at 113oF. A pronounced decrease occurred for samples at 131oF. With further increase in temperature, little difference was observed. Expressable moisture indexes were similar for the 149, 167, and 185oF end points. Holding time had little if any effect on all parameters measured.

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