Abstract
Tubers from bulk samples of Norchip potatoes were separated into specific gravity groups by weighing each tuber in air and then in water. Forty-nine chipping samples were assembled according to specific gravity from the segregated tubers (1.060 to 1.110 specific gravity). Chip yield increased and chip oil content decreased linearly through a specific gravity of 1.110. The contribution of specific gravity to chip yield was demonstrated by expressing chip yeild on a zero percent oil basis. For all lots of Norchips tested, the specific gravity distribution was similar, and all standard deviations (s) were the same (0.0064). Using s, a table of tolerances was compiled for estimation of the appropriate sample size for routine specific gravity determinations.
Resumen
Tubérculos de muestras a granel de papas Norchip fueron separadas en grupos, en base a gravedad específica pesando cada tubérculo en aire y luego en agua. Cuarenta y nueve muestras chip fueron montadas de acuerdo a gravedad específica de los tubérculos segregados (1.060 a 1.110 de gravedad especifica).
El rendimiento para chip aumentó y el contenido de aceite disminuyó linealmente hacia 1.110 de gravedad específica.
La contribución de la gravedad específica al rendimiento en chip fue demostrada expresando el rendimiento chip en base a cero por ciento de aceite.
Para todos los lotes de Norchip probados la distributión de la gravedad específica fue similar y todas las desviaciones standard (S) fueron las mimas (0, 0064).
Usando S, una tabla de tolerancia fue recopilada para la estimación del tomaño de muestra apropiado para determinaciones rutinarias de gravedad específica.
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Literature Cited
Bewel, E.R. 1937. The Determination of the Cooking Quality of Potatoes. Am Potato J 14: 235–242.
Brady, H.V. 1964. A Simple Reliable Procedure for Moisture Determination in Potato Chips. Proc Prod Tech Div Metgs Potato Chip Inst Int 1964, 23.
Clark, C.F., P.M. Lombard and E.F. Whiteman. 1940. Cooking Quality of the Potato as Measured by Specific Gravity. Am Potato J 17: 38–45.
Food Safety and Quality Service, 1978. United States Standards for Grades of Potatoes for Chipping. U.S. Dep Agric, Washington, D.C.
Gould, W.A. 1977. Part I. Examining the Potato. Chipper Snacker 34: 26, 28.
Kirkpatrick, M.E., P.H. Heinze, C.C. Craft, B.N. Mountjoy and C.E. Falatko. 1956. French-Frying Quality of Potatoes as Influenced by Cooking methods, Storage Conditions and Specific Gravity of Tubers. U.S. Dep Agric Res Tech Bull 1142.
Kunkel, R., P.F. Gifford, A.D. Edgar and A.M. Binkley. 1952. The Mechanical Separation of Potatoes Into Specific Gravity Groups. Colo Agric Exp Stn Bull 422-A.
Lana, E.P., R.H. Johansen and D.C. Nelson. 1970. Variation in Specific Gravity of Potato Tubers. Am Potato J 47: 9–12.
Perry, A.L. 1961. Sampling Potatoes for Specific Gravity. Maine Farm Res 9: 22–24.
Porter, W.L., T.J. Fitzpatrick and E.A. Talley. 1964. Studies of the Relationship of Specific Gravity to Total Solids of Potatoes. Am Potato J 41: 329–336.
Sayre, R.N., M. Nonaka, and M.L. Weaver. 1975. French Fry Quality Related to Specific Gravity and Solids Content Variation Among Potato Strips Within the Same Tuber. Am Potato J 52: 73–82.
Schippers, P.A. 1976. The Relationship Between Specific Gravity and Percentage Dry Matter in Potato Tubers. Am Potato J 53: 111–112.
Shaw, R., C.D. Evans, S. Munson, G.R. List and K. Warner. 1973. Potato Chips From Unpeeled Potatoes. Am Potato J 424–430.
Simmonds, N.W. 1977. Relations Between Specific Gravity, Dry Matter Content and Starch Content of Potatoes. Potato Res 20: 137–140.
Smith, O. 1951. Effect of Specific Gravity and Partial Drying of Potato Slices on Yield, Color, Oil Content and Time of Frying Chips. Natl Potato Chip Inst, Fats and Oils, Article 6, 1–2.
Smith, O. and L.B. Nash. 1940. Potato Quality. I. Relation of Fertilizers and Rotation Systems to Specific Gravity and Cooking Quality. Am Potato J 17: 163–169.
Talburt, W.F. and O. Smith. 1975. Potato Processing. Third Edition. AVI Publishing Co., Westport, CT.
Whiteman, T.M. and R.C. Wright. 1949. Effects of Variety, Specific Gravity of Tubers, and Cooking Fat on the Quality and Yield of Potato Chips. Potato Chipper 9: 18, 20, 22, 26, 28, 32, 34, 38.
Wilson, J.H. and A.M. Lindsay. 1969. The Relation Between Specific Gravity and Dry Matter Content of Potato Tubers. Am Potato J 46: 323–328.
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A laboratory cooperatively operated by the North Central Region, Agricultural Research, SEA, United States Department of Agriculture; the Minnesota Agricultural Experiment Station; the North Dakota Agricultural Experiment Station; and the Red River Valley Potato Growers’ Association.
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Lulai, E.C., Orr, P.H. Influence of potato specific gravity on yield and oil content of chips. American Potato Journal 56, 379–390 (1979). https://doi.org/10.1007/BF02855348
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DOI: https://doi.org/10.1007/BF02855348