title: Physico-chemical properties of starches isolated from potato cultivars grown in soils with different phosphorus availability.
abstract: BACKGROUND
  Starch is the major component of potato tubers, amounting approximately to 150-200 g kg (-1) of the tuber weight. Starch is considered to be a major factor for the functionality of the potato in food applications. This study evaluated the physical characteristics of potato starches isolated from tubers of different potato cultivars grown in soil with three levels of phosphorus (P) availability. All potatoes were growing according the same method. The starches were isolated by physical methods and the samples were analyzed for the amylose, P content, paste properties (RVA) and thermal properties of gelatinization and retrogradation (DSC). Experimental data were analyzed considering the potato cultivars and the three soil P availability.
  
  
  RESULTS
  For all measured parameters significant impact of cultivar and soil P availability was determined. Phosphorus contents in potato starches ranged from 0.252 to 0.647 g kg(-1) and amylose from 27.18 to 30.8%. Starches from different potato cultivars independent of soil showed a small range of gelatinization temperature. All starches showed low resistance heating and shear stress.
  
  
  CONCLUSIONS
  The results showed the influence of growing conditions (soil P availability) and also of the differences between the potato cultivars on important characteristics of applicability of starches.
authors.affiliation: Center for Tropical Roots and Starches (CERAT), São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.
authors.forename: Magali
authors.initials: M
authors.lastname: Leonel
authors.affiliation: Center for Tropical Roots and Starches (CERAT), São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.
authors.forename: Ezequiel L
authors.initials: EL
authors.lastname: Carmo
authors.affiliation: Center for Tropical Roots and Starches (CERAT), São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.
authors.forename: Adalton M
authors.initials: AM
authors.lastname: Fernandes
authors.affiliation: Center for Tropical Roots and Starches (CERAT), São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.|Department of Food Engineering and Technology, Institute of Biosciences, Language, and Physical Sciences, São Paulo State University (UNESP), São José do Rio Preto, São Paulo, Brazil.
authors.forename: Célia M L
authors.initials: CM
authors.lastname: Franco
authors.affiliation: Center for Tropical Roots and Starches (CERAT), São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.|Department of Crop Science, College of Agricultural Sciences, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.
authors.forename: Rogério P
authors.initials: RP
authors.lastname: Soratto
mesh_terms: D010758:Phosphorus / Q000737:chemistry / Q000378:metabolism*; D012987:Soil / Q000737:chemistry*; D011198:Solanum tuberosum / Q000737:chemistry* / Q000378:metabolism; D013213:Starch / Q000737:chemistry* / Q000378:metabolism
chemical_list: D012987:Soil; D010758:Phosphorus; D013213:Starch
keywords: Solanum tuberosum; amylose; phosphorus; starch; thermal properties; viscosity