Antimicrobial Activity And Differentiation Of Anthocyanin Profiles Of Rabbiteye And Highbush Blueberries Using Hplc–dad–esi-msn And Multivariate Analysis

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)This study aims to perform in vitro analyses of the antimicrobial activity of ten blueberry cultivars, to characterize the anthocyanin composition of these fruits, and to use multivariate analysis to compare the results. All blueberry cultivars presented anti-Escherichia coli activity. Furthermore, the complete series of six glycosides (galactoside, glucoside, arabinoside, xyloside, acetylgalactoside and acetylglucoside) of five anthocyanidins (delphinidin, cyanidin, petunidin, peonidin, and malvidin) were detected, together with six malonyl derivatives of the main anthocyanins. The rabbiteye cultivars showed higher proportions of cyanidin 3-galactoside than the highbush cultivars, the latter accounting for higher proportions of the 3-arabinosides of delphinidin and malvidin. The total anthocyanin content was between 10.8 and 26.5 g/kg of dry weight, and the concentration depended on the size of the berries, with the smaller rabbiteye cultivars exhibiting higher levels of anthocyanins. © 2016 Elsevier Ltd26506516CAPES, Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorESF, Fondo Social EuropeoUNICAMP, Universidade Estadual de CampinasCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Phenolic Composition Of The Berry Parts Of Hybrid Grape Cultivar Brs Violeta (brs Rubea×iac 1398-21) Using Hplc-dad-esi-ms/ms

The grape is considered a major source of phenolic compounds when compared to other fruits and vegetables, however, there are many cultivars with distinct characteristics directly linked to phenolic profile. Thus, the present study aimed to identify and quantify, for the first time and in detail, the phenolic compounds present in the skin, flesh and seeds of BRS Violeta grape berry using combination of SPE methodologies and analytical HPLC-DAD-ESI-MS/MS. The study was extended to the different berry parts and the most important grape and wine phenolic families, and has revealed interesting features. Violeta grape has a very thick skin (46% of grape weight) that accumulated the most of grape phenolic compounds: great amount of anthocyanins (3930. mg/kg, as malvidin 3,5-diglucoside), together with also important amounts of flavonols (150. mg/kg, as quercetin 3-glucoside), hydroxycinnamic acid derivatives (HCAD; 120. mg/kg, as caftaric acid), and proanthocyanidins (670. mg/kg, as (+)-catechin); in contrast, it seems to be a low resveratrol producer. Violeta grape seeds accounted for similar proportions of low molecular weight flavan-3-ols (mainly monomers; 345. mg/kg, as (+)-catechin) and proanthocyanidins (480. mg/kg, as (+)-catechin). Violeta grape is a teinturier cultivar, but it only contained traces of anthocyanins and low amounts of all the other phenolic types in its red-colored flesh. The anthocyanin composition of Violeta grape was dominated by anthocyanidin 3,5-diglucosides (90%). Within flavonols, myricetin-type predominated and kaempferol-type was missing. In addition to expected hydroxycinnamoyl-tartaric acids, several isomeric esters of caffeic and p-coumaric acids with hexoses were tentatively identified, accounting for relevant proportions within the pool of HCAD. 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