American Potato Journal

, Volume 50, Issue 3, pp 86–95 | Cite as

Effects of various processing methods on free and bound amino acid contents of potatoes

  • A. S. Jaswal


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.


Free Amino Acid Specific Gravity Amino Acid Content Total Amino Acid High Specific Gravity 
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Literature Cited

  1. 1.
    Blackburn, S. 1968. Amino acid determination. Methods and techniques. Edward Arnold (Publishers) Ltd., London, p. 125–127.Google Scholar
  2. 2.
    Carpenter, K. J. 1960. The estimation of available lysine in animal protein foods. Biochem, J. 77: 604–610.Google Scholar
  3. 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. 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
  5. 5.
    Holsinger, V. H., Posati, L. P. and M. J. Pallansch. 1971. Anomalous results obtained in the determination of available lysine in casein using 2, 4, 6-trinitrobenzenesulfonic acid. J. Dairy Science. 53: 1638–1639.CrossRefGoogle Scholar
  6. 6.
    Hughes, B. P. 1958. The amino acid composition of potato protein and of cooked potatoes. Brit. J. Nutrition 12: 188–195.CrossRefGoogle Scholar
  7. 7.
    Jaswal, A. S. 1970. Nonstarch polysaccharides and the texture of french fried potato. Amer. Potato J. 47: 311–316.Google Scholar
  8. 8.
    Kakade, M. L. and I. E. Liener. 1969. A simplified procedure for the determination of availabale lysine in protein and protein foodstuffs. Anal. Biochem. 27: 273–276.PubMedCrossRefGoogle Scholar
  9. 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
  10. 10.
    Muller, E. G. and K. Bakema. 1956. Effect of nitrogen, phosphorus, potassium and magnesium nutrition of potato plants on the content of free amino acids and on the amino acid composition of the protein of the tubers. Plant and Soil 7: 135–166.CrossRefGoogle Scholar
  11. 11.
    Osner, R. C. and R. M. Johnson. 1968. Nutritional changes in proteins during heat processing. J. Food-Technol. 3: 81–86.CrossRefGoogle Scholar
  12. 12.
    Reynolds, T. M. 1965. Chemistry of non-enzymatic browning II. Adv. in Food Res. 14: 167–173.Google Scholar
  13. 13.
    Roach, A. G., Sanderson, P. and D. R. Williams. 1967. Comparison of methods for the determination of available lysine value in animal and vegetable protein sources. J. Sci. Fd. Agric. 18: 274–278.CrossRefGoogle Scholar
  14. 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. 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

Copyright information

© Springer 1973

Authors and Affiliations

  • A. S. Jaswal
    • 1
  1. 1.The Research and Productivity CouncilFrederictonCanada

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