Ultrasonic determination of fish composition

Abstract Our objective was to ascertain the relationship between the ultrasonic properties of fish and their composition. Fish analogs with varying protein (15–25 wt%), lipid (0–25 wt%) and moisture (55–80 wt%) contents were prepared by mixing dried cod powder, sunflower oil and distilled water. The temperature dependence of the ultrasonic velocity of fish analogs was measured from 5 to 35 °C. The ultrasonic velocity increased with solids-non-fat at all temperatures, but had a more complex dependence on fat content. Around 15 °C the ultrasonic velocity was independent of fat, at lower temperatures it increased with fat, and at higher temperatures it decreased. Empirical equations were developed to relate the ultrasonic velocity to composition. By measuring the ultrasonic properties of fatty tissue at at least two temperatures it should be possible to determine both the fat and solids-non-fat content. For non-fatty fish, the solids-non-fat content can be determined from a single measurement. Our results highlight the potential of ultrasonic velocity measurements to rapidly and nondestructively determine fish composition.

[1]  W. Horwitz.  Official Methods of Analysis , 1980 .

[2]  Malcolm J. W. Povey,et al.  Ultrasonics in food engineering Part II: Applications , 1989 .

[3]  David Julian McClements,et al.  Ultrasonics in food engineering. Part I: Introduction and experimental methods , 1988 .

[4]  J. Synowiecki,et al.  Chemical composition and nutritional value of processing discards of cod (Gadus morhua) , 1991 .

[5]  R. Chivers,et al.  Application of Ultrasonic Waves to Detect Sealworms in Fish Tissue , 1989 .

[6]  Walter G. Mayer,et al.  Fundamentals of Ultrasonics , 1964 .

[7]  C. A. Miles,et al.  Ultrasonic estimation of solid/liquid ratios in fats, oils and adipose tissue , 1985 .

[8]  A. Spindler,et al.  GROSS COMPOSITION, SENSORY EVALUATION, AND COLD STORAGE STABILITY OF UNDERUTILIZED DEEP SEA PACIFIC RATTAIL FISH, Coryphaenoides acrolepis , 1979 .

[9]  J. Montecalvo,et al.  Chemical Composition and Protein Quality of Some Southern New England Marine Species , 1984 .

[10]  David Julian McClements,et al.  Use of Ultrasound to Determine Cod Fillet Composition , 1997 .

[11]  M. Povey,et al.  Ultrasonic analysis of edible fats and oils. , 1992, Ultrasonics.

[12]  J. Eliassen,et al.  Seasonal variations in biochemical composition and energy content of liver, gonad and muscle of mature and immature cod, Gadus morhua (L.) from Balsfjorden, northern Norway , 1982 .

[13]  David Julian McClements,et al.  Ultrasonic pulse echo reflectometer , 1991 .

[14]  M. Povey,et al.  Ultrasonic investigation of aqueous solutions of a globular protein , 1992 .

[15]  D. Mcclements,et al.  Frequency scanning ultrasonic pulse echo reflectometer , 1992 .

[16]  C. Javanaud,et al.  Applications of ultrasound to food systems , 1988 .

[17]  Warren J. McGonnagle.  International advances in nondestructive testing , 1977 .

[18]  D. Julian McClements,et al.  Advances in the application of ultrasound in food analysis and processing , 1995 .

[19]  D. Mcclements.  Ultrasonic characterisation of emulsions and suspensions , 1991 .