Summary
Starch and pulp were isolated from three cultivars of potato tubers grown in four localities. The starch content in the pulp was determined by an enzymatic method which is shown to be more accurate than a polarimetric method. On an average, 94% of the starch was isolated and 5% remained in the pulp.
The change in low-molecular weight carbohydrates in the potato tubers during storage for 2, 4, 7 and 11 weeks at 9 C was studied. Generally there was an increase of sucrose, glucose, fructose andmyo-inositol during the first 2–4 weeks of storage, followed by a diminishing decrease.
References
Bethge, P. O., R. Rådeström & O. Theander, 1971. Kvantitativ kolhydratbestämming—en detaljstudie.Medd. STFI 63B (communication from the Swedish Forest Products Research Laboratory, S-114 86 Stockholm, Sweden).
Burton, W. G., 1966. The potato. Veenman, Wageningen, Netherlands, p. 210–251.
Burton, W. G., 1972. Physiological and biochemical changes in the tuber as affected by storage conditions.Proc. 5th triem. Conf. Eur. Ass. Potato Res.: 63–81.
Burton, W. G. & A. Wilson, 1978. The sugar content and sprout growth of tubers of potato cultivar. Record grown in different localities, when stored at 10,2 and 20 CPotato Res. 21: 145–162.
Bylund, M. & A. Donetzhuber, 1968. Semi-micro determination of uronic acids.Sv. Papperstidn. 15: 505–508.
Carlsson, H., 1967. The relationship between specific gravity, dry matter and starch in potatoes.Lantbruckshögsk. Ann. 33: 695–702.
Carlsson, H., 1970. Production of potatoes for chipping.Publ. Dep. Pl. Husb. Swed. Univ. agric. Sci. 26: 1–64.
Clegg, K. M., 1956. The application of the anthrone reagent to the estimation of starch in cereals.J. Sci. Food Agric. 7: 40–44.
Ford, C. W. 1974. Semimicro quantitative determination of starch in plant material by gas-liquid chromatography.Analyt. Biochem. 57: 413–420.
Fuchs, G., B.-M. Gawell & B.-M. Lidhem, 1974. Quantitative determination of low-molecular carbohydrates in food by gas-liquid chromatography.Swed. J. agric. Res. 4: 49–52.
Hadorn, H. & F. Doevelaar, 1960. Systematische Untersuchungen über titrimetrische, kolorimetrische und polarimetrische Stärkebestimmungen.Mitt. Geb. Lebensmittelunters. u. Hyg. 51: 1–68.
Heyns, K. & F. Schneider, 1971. Chemische Technologie. In: K. Winnacher & L. Küchler (Ed.), Chemische Technologie. München. p. 589–648.
Kungl. Lantbruksstyrelsens Kungörelser m.m., 1950. Stärkelse i potatis, Vol. 6: 43–44.
MacRac, J. C., 1971. Quantitative measurement of starch in very small amounts of leaf tissue.Planta 96: 101–108.
MacRae, J. C. & D. G. Armstrong, 1968. Enzyme method for determination of α-linked glucose polymers in biological materials.J. Sci. Food Agric. 19: 578–581.
Olered, R., 1978. The influence of cultivar and environment on potato starch properties.Proc. 7th trienn. Conf. Eur. Ass. Potato Res. (Warsaw, Poland, 1978).
Preece, I. A. & K. G. MacKenzie, 1952. Non-starchy polysaccharides of cereal grains. I. Fractionation of the barley gums.J. Inst. Brew. 58: 353–362.
Salo, M. & M. Salmi, 1968. Determination of starch by the amyloglucosidase method.J. Sci. Agric. Soc. Finland 40: 38–45.
Sawardeker, J. S., J. H. Sloneker & A. Jeanes, 1965. Quantitative determination of monosaccharides as their alditol acetates by gas liquid chromatography.Analyt. Chem. 37: 1602–1604.
Sweeley, C. C., R. Bentley, M. Makita & W. W. Wells, 1963. Gas-liquid chromatography of trimethylsilyl derivates of sugars and related substances.J. Am. chem. Soc. 85: 2497–2507.
Theander, O. & P. Åman 1977. Fractionation and characterization of polysaccharides in rapeseed (Brassica napus) meal.Swed. J. agric. Res. 7: 69–77.