title: Sugars profiles of different chestnut (Castanea sativa Mill.) and almond (Prunus dulcis) cultivars by HPLC-RI.
abstract: Sugar profiles of different almond and chestnut cultivars were obtained by high-performance liquid chromatography (HPLC), by means of a refractive index (RI) detector. A solid-liquid extraction procedure was used in defatted and dried samples. The chromatographic separation was achieved using a Eurospher 100-5 NH(2) column using an isocratic elution with acetonitrile/water (70:30, v/v) at a flow rate of 1.0 ml/min. All the compounds were separated in 16 min. The method was optimized and proved to be reproducible and accurate. Generally, more than 95% of sugars were identified for both matrixes. Sugars profiles were quite homogeneous for almond cultivars; sucrose was the main sugar (11.46 +/- 0.14 in Marcona to 22.23 +/- 0.59 in Ferragnes g/100 g of dried weight), followed by raffinose (0.71 +/- 0.05 in Ferraduel to 2.11 +/- 0.29 in Duro Italiano), glucose (0.42 +/- 0.12 in Pegarinhos two seeded to 1.47 +/- 0.19 in Ferragnes) and fructose (0.11 +/- 0.02 in Pegarinhos two seeded to 0.59 +/- 0.05 in Gloriette). Commercial cultivars proved to have higher sucrose contents, except in the case of Marcona. Nevertheless, chestnut cultivars revealed a high heterogeneity. Sucrose was the main sugar in Aveleira (22.05 +/- 1.48), Judia (23.30 +/- 0.83) and Longal (9.56 +/- 0.91), while glucose was slightly prevalent in Boa Ventura (6.63 +/- 0.49). The observed variance could serve for inter-cultivar discrimination.
authors.affiliation: CIMO-Escola Superior Agrária, Instituto Politécnico de Bragança, Campus de Santa Apolónia, Bragança, Portugal.
authors.forename: João C M
authors.initials: JC
authors.lastname: Barreira
authors.forename: José Alberto
authors.initials: JA
authors.lastname: Pereira
authors.forename: M Beatriz P P
authors.initials: MB
authors.lastname: Oliveira
authors.forename: Isabel C F R
authors.initials: IC
authors.lastname: Ferreira
mesh_terms: D002241:Carbohydrates / Q000032:analysis* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D029962:Fagaceae / Q000737:chemistry*; D009754:Nuts / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D027861:Prunus / Q000737:chemistry*
chemical_list: D002241:Carbohydrates; D010936:Plant Extracts