Postharvest quality of twelve onion cultivars grown in the Southeast of Brazil

dc.contributor.authorMiguel, ACA
dc.contributor.authorDurigan, MFB
dc.contributor.authorDurigan, J. F.
dc.contributor.authorMoretti, C. L.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:17:31Z
dc.date.available2014-05-20T13:17:31Z
dc.date.issued2005-01-01
dc.description.abstractOnions (Allium cepa L.) are grown in different parts of the Brazilian territory and are considered the third most important vegetable crop cultivated in the country, only behind potatoes and tomatoes. The present work was carried out aiming to evaluate the postharvest quality of twelve different onion cultivars grown in the Southeast of Brazil. Onions of the cultivars; 'Adocicada', 'Branca', 'Picante' and 'Roxa' were harvested in commercial fields and the cultivars 'Princesa', 'Serrana', 'Bulbo duplo', 'Granex 33', 'XP 6803', 'XP 8418', 'RP 6010' and 'Superex' were obtained in experimental fields. After harvest, bulbs were taken to the postharvest laboratory and evaluated for total soluble solids, titratable acidity, and pungency (aliinase activity). For total soluble solids 'Superex' had the lowest sugar content (5.4 degrees Brix) whereas the cultivar named 'Picante' showed the highest Brix (11.0 degrees Brix) among the studied materials. For titratable acidity, it was verified that 'Serrana' had the lowest acid content (0.094 g piruvic acid.100 g(-1) FW) whereas 'Branca' showed the highest content of organic acids. When pungency was evaluated it was verified that aliinase activity varied from 1.37 pg piruvic acid.100 g(-1) FW for 'Adocicada' to 12.18 mu g piruvic acid.100 g(-1) FW for 'Roxa', which was considered to have hot pungency (high alliinase activity and low TSS/TA), whereas 'Bulbo duplo' was evaluated as pungent (high alliinase activity and TSS/TA). The combination of the studied characteristics indicated that an onion with high pungency must have high aliinase activity and titratable acidity, whereas sweet onions shall have high soluble solids contents and low aliinase activity. Based on this information, 'Branca' bulbs were considered acids (weak pungency and high acidity), whereas 'Adocicada', 'Princesa', and 'Serrana' bulbs are sweet, due to low alliinase activity and titratable acidity. 'Superex', 'XP 6803', 'Granex 33' and 'Picante' had a moderately pungent flavor (alliinase activity intermediate and low TSS/TA), but 'XP 8418' and 'RP 6010' flavor was evaluated as lightly pungent (low alliinase activity TSS/TA).en
dc.description.affiliationUNESP, FCAV, Dept Technol, BR-14884900 Jaboticabal, SP, Brazil
dc.description.affiliationUnespUNESP, FCAV, Dept Technol, BR-14884900 Jaboticabal, SP, Brazil
dc.format.extent265-268
dc.identifierhttp://www.actahort.org/books/688/688_36.htm
dc.identifier.citationProceedings of the Ivth International Symposium on Edible Alliaceae. Leuven 1: International Society Horticultural Science, n. 688, p. 265-268, 2005.
dc.identifier.issn0567-7572
dc.identifier.urihttp://hdl.handle.net/11449/3960
dc.identifier.wosWOS:000233358800036
dc.language.isoeng
dc.publisherInternational Society Horticultural Science
dc.relation.ispartofProceedings of the Ivth International Symposium on Edible Alliaceae
dc.relation.ispartofsjr0,198
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectAllium cepapt
dc.subjectaliinasept
dc.subjectpungencypt
dc.subjecttitratable aciditypt
dc.subjecttotal soluble solidspt
dc.titlePostharvest quality of twelve onion cultivars grown in the Southeast of Brazilen
dc.typeTrabalho apresentado em evento
dcterms.licensehttp://www.ishs.org/authors
dcterms.rightsHolderInternational Society Horticultural Science
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt
unesp.departmentTecnologia - FCAVpt

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