Effects of various processing methods on free and bound amino acid contents of potatoes
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The effects of various processing methods on available lysine and total and free amino acid levels of low (1.065 – 1.075) specific gravity (LSG) and high (1.095 – 1.106) specific gravity (HSG) potatoes were investigated.
LSG potatoes after canning and chip making showed approximately 40% loss of total amino acid contents. Such losses in drum dried potatoes were approximately 20% and that of french fries 4.5%. All processing methods adversely affected the available lysine content; chips and canned potatoes showing the maximum loss, followed by drum dried and french fried potatoes.
Losses in HSG potato products showed a trend similar to that of LSG material, but on a considerably reduced scale.
KeywordsFree Amino Acid Specific Gravity Amino Acid Content Total Amino Acid High Specific Gravity
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- 1.Blackburn, S. 1968. Amino acid determination. Methods and techniques. Edward Arnold (Publishers) Ltd., London, p. 125–127.Google Scholar
- 2.Carpenter, K. J. 1960. The estimation of available lysine in animal protein foods. Biochem, J. 77: 604–610.Google Scholar
- 3.Fitzpatrick, T. J. and W. L. Porter. 1968. Microwave finishing of potato chips. Effect on the amino acids and sugars. Amer. Potato J. 45: 103–110.Google Scholar
- 4.Gordon, G. W. and J. J. Basch. 1964. Vitamins and other nutrients. Hydrolysis of proteins for amino acid analysis. 11. Acid hydrolysis in sealed tubes of mixtures of B-lactoglobulin and starch. J. of the AOAC. 47: 745–747.Google Scholar
- 7.Jaswal, A. S. 1970. Nonstarch polysaccharides and the texture of french fried potato. Amer. Potato J. 47: 311–316.Google Scholar
- 9.Mauron, J. 1961. Progress in meeting protein needs of infants and preschool children. Publ. 843, Nat. Acad. Sci., Natl. Res. Counc., Wash., D.C., U.S.A., p. 424.Google Scholar
- 12.Reynolds, T. M. 1965. Chemistry of non-enzymatic browning II. Adv. in Food Res. 14: 167–173.Google Scholar
- 14.Talley, E. A., Fitzpatrick, T. J. and W. L. Porter. 1970. Chemical composition of potato. VIII. Effect of variety, location and year of growth on the content of nitrogen compounds. Amer. Potato J. 47: 231–244.Google Scholar
- 15.Talley, E. A. and W. L. Porter. 1970. Chemical composition of potatoes VII. Relationship of the free amino acid concentration to specific gravity and storage time. Amer. Potato J. 47: 214–224.Google Scholar