Abstract
The aim of this study was to evaluate morphological (of fruit and kernel), mechanical (namely shell rupture force) and antioxidant properties (including phenolics and flavonoid content) of five Portuguese almond cultivars, comparing them with two commercial cultivars (Glorieta and Ferragnès). Of the analyzed traits, nut and kernel dimensions varied substantially and were used to describe cultivars. However, some traditional cultivars recorded similar (Pegarinhos), or even higher (Amendoão, Casanova and Refêgo) nut and kernel weight than commercial cultivars. Furthermore, shelling percentage of traditional cultivar (Bonita) was higher than commercial cultivars. Rupture force necessary to break fruits of all traditional cultivars was higher than commercial ones, and was correlated to nut weight cultivars. The phenolics, flavonoids content and antioxidants were higher for Casanova. Parameters like high kernel weight, low percentages of double kernels or losses during shelling and considerable higher phenolics and flavonoids content may be considered by industry during selection of almond.
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References
Agila A, Barringer S (2012) Effect of roasting conditions on color and volatile profile including HMF level in sweet almonds (Prunus dulcis). J Food Sci 77:461–468
Aktas T, Polat R, Atay U (2007) Comparison of mechanical properties of some selected almond cultivars with hard and soft shell under compression loading. J Food Process Eng 30:773–789
Altuntas E, Gercekcioglu R, Kaya C (2010) Selected mechanical and geometric properties of different almond cultivars. Int J Food Prop 13:282–293
Antonucci F, Costa C, Pallottino F, Paglia G, Rimatori V, De Giorgio D, Menesatti P (2012) Quantitative method for shape description of almond cultivars (Prunus amygdalus Batsch). Food Bioprocess Technol 5:768–785
Arslan S, Vursavus K (2008) Physico-mechanical properties of almond nut and its kernel as a function of variety and moisture content. Philipp Agric Sci 91:171–179
Askin M, Balta M, Tekintas F, Kazankaya A, Balta F (2007) Fatty acid composition affected by kernel weight in almond [Prunus dulcis (Mill.) DA Webb.] genetic resources. J Food Compost Anal 20:7–12
Barreira J, Ferreira I, Oliveira M, Pereira J (2008) Antioxidant activity and bioactive compounds of ten Portuguese regional and commercial almond cultivars. Food Chem Toxicol 46:2230–2235
Benzie I, Strain J (1996) The ferric reducing ability of plasma (FRAP) as a measure of “antioxidant power”: the FRAP assay. Anal Biochem 239:70–76
Cabrita L, Apostolova H, Neves A, Leitão J (2014) Genetic diversity assessment of the almond (Prunus dulcis (Mill.) D.A. Webb) traditional germplasm of Algarve, Portugal, using molecular markers. Plant Genet Resour 12:164–167
Colic S, Rakonjac V, Zec G, Nikolic D, Aksic M (2012) Morphological and biochemical evaluation of selected almond [Prunus dulcis (Mill.) DA Webb] genotypes in northern Serbia. Turk J Agric For 36:429–438
Cordeiro V, Monteiro A (2001) Almond growing in Trás-os-Montes region (Portugal). Acta Hortic 591:161–165
Jia Z, Tang M, Wu J (1999) The determination of flavonoid contents in mulverry and their scavenging effects on superoxide radicals. Food Chem 64:555–559
Kodad O, Socias i Company R (2008) Fruit quality in almond as related to the type of pollination in self-compatible genotypes. J Am Soc Hortic Sci 133:320–326
Kodad O, Socias i Company R, Alonso J (2007) Fruit quality in almond: physical aspects for breeding strategies. Acta Hortic 814:475–480
Kodad O, Lebrigui L, El-Amrani L, Socias i Company R (2014) Physical fruit traits in Moroccan almond seedlings: quality aspects and post-harvest uses. Int J Fruit Sci 15:36–53
Kornsteiner M, Wagner K, Elmadfa I (2006) Tocopherols and total phenolics in 10 different nut types. Food Chem 98:381–387
Ledbetter C (2008) Shell cracking strength in almond (Prunus dulcis [Mill.] D.A. Webb.) and its implication in uses as a value-added product. Bioresour Technol 99:5567–5573
Ledbetter C, Palmquist D (2006) Comparing physical measures and mechanical cracking products of “Nonpareil” almond (Prunus dulcis [Mill.] D.A. Webb.) with two advanced breeding selections. J Food Eng 76:232–237
Ledbetter C, Sisterson M (2010) Carpological variability of almond [Prunus dulcis (Mill.) DA Webb cv. Nonpareil] in a single orchard during seven consecutive harvests. HortScience 45:1788–1792
McGuire R (1992) Reporting objective color measurements. HortScience 27:1254–1255
Milbury P, Chen C, Dolnikowski G, Blumberg J (2006) Determination of flavonoids and phenolics and their distribution in almonds. J Agric Food Chem 54:5027–5033
Mohsenin N (1980) Physical properties of plants and animal materials. Gordon and Breach Science Publishers, New York
Oyaizu M (1986) Studies on products of browning reactions: antioxidative activities of products of browning reaction prepared from glucosamine. Jpn J Nutr 44:307–315
Pereira J, Oliveira I, Sousa A, Ferreira I, Bento A, Estevinho L (2008) Bioactive properties and chemical composition of six walnut (Juglans regia L.) cultivars. Food Chem Toxicol 46:2103–2111
Rao H (2012) Therapeutic applications of almonds (Prunus amygdalus L.): a review. J Clin Diagn Res 6:130–135
Re R, Pellegrini N, Proteggente A, Pannala A, Yang M, Rice-Evans C (1999) Antioxidant activity applying an improved ABTS radical cation decolorization assay. Free Radic Biol Med 26:1231–1237
Singleton V, Rossi J (1965) Colorimetry of total phenolics with Phosphomolibdic−phosphothungstic acid. Am J Enol Vitic 16:144–158
Socias i Company R, Kodad O, Alonso J, Gradziel T (2008) Almond quality: a breeding perspective. Hortic Rev 34:197–238
Valverde M, Madrid R, García A (2006) Effect of the irrigation regime, type of fertilization, and culture year on the physical properties of almond (cv. Guara). J Food Eng 76:584–593
Yaghini H, Shirani M, Archangi A, Sorkheh K, Chaleshtori S, Sangi S, Khodambashi M, Tavakoli F (2013) Phenotypic diversity and relationships of fruit quality traits in inter-specific almond × peach backcrosses breeding progenies. Euphytica 194:305–324
Acknowledgements
Ivo Oliveira is grateful to FCT—Fundação para a Ciência e a Tecnologia (FCT) for the Post-doctoral Fellowships SFRH/BPD/111005/2015. “This work is supported by : European Investment Funds by FEDER/COMPETE/POCI– Operacional Competitiveness and Internacionalization Programme, under Project POCI-01-0145-FEDER-006958 and National Funds by FCT—Portuguese Foundation for Science and Technology, under the project UID/AGR/04033/2013.”
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Oliveira, I., Meyer, A., Afonso, S. et al. Morphological, mechanical and antioxidant properties of Portuguese almond cultivars. J Food Sci Technol 55, 467–478 (2018). https://doi.org/10.1007/s13197-017-2955-3
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DOI: https://doi.org/10.1007/s13197-017-2955-3