Microcomponents of olive oil. Part II: Digalactosyldiacylglycerols from Olea europaea

Bianco, Armandodoriano; Mazzei, Raffaele Antonio; Melchioni, Cristiana; Scarpati, Maria Luisa; Romeo, Giovanni; Uccella, Nicola

doi:10.1016/s0308-8146(97)00192-1

Cited by 25 publications

(19 citation statements)

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“…As seen in the table, the addition of water and the application of sheer force were enough to form an emulsion, as lipid-soluble emulsifiers are naturally present. These are compounds such as partial acylglycerols and digalactosyldiacylglycerols, which are present even in the filtered olive oil [7][8][9].…”

Section: Water-oil Emulsion Models: the Role Of Minor Componentsmentioning

confidence: 99%

“…As far as emulsification is concerned, it has to be mentioned that there are emulsifying agents present in virgin olive oil such as diacylglycerols, ranging from 1 to 2.8%, and monoacylglycerols, at less than 0.25% [7,8]. Bianco and his coworkers [9] identified two galactosyl glycosides in freshly produced olive oils, while in a recent study "in this laboratory" [10] it was found that the level of phospholipids present in cloudy olive oil may range from 21 to 126 mg/kg oil. All these compounds may contribute to the formation of an emulsion with a small quantity of water already present in the freshly produced olive oil.…”

Section: Introductionmentioning

confidence: 99%

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Endogenous microflora in turbid virgin olive oils and the physicochemical characteristics of these oils

Koidis

Triantafillou

Boskou

2008

Euro J Lipid Sci & Tech

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Cloudy olive oil, the fresh olive juice, is an intermediate form before full precipitation of freshly produced olive oil. Some consumers prefer it because they consider it as more natural and less processed. The cloudy form can persist for several months. The oil is a sort of dispersion/suspension system which can be also described as a micro‐emulsion/suspension. Water micro‐droplets were found to have a size ranging from 1 to 5 µm. Cloudiness is due to the low water content and the presence of natural emulsifiers in the oil. The suspension is formed by solid particles (5–60 µm) deriving from the olive fruit. They are present in small amounts (12–460 mg/kg oil). In the newly produced olive oil, containing 0.17–0.49% water, a number of microorganisms of different types (bacteria, yeasts, moulds) were found to survive, but at very low concentrations (<3 log cfu/mL oil). They originate from the exterior of the fruit (epiphytic microflora) and their presence is considered natural. Their enzyme activities do not seem to affect the quality of the final product.

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Section: Water-oil Emulsion Models: the Role Of Minor Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Endogenous microflora in turbid virgin olive oils and the physicochemical characteristics of these oils

Koidis

Triantafillou

Boskou

2008

Euro J Lipid Sci & Tech

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“…14 A ocorrência livre de 2 foi relatada anteriormente em óleo de oliva 15 e propriedades anti-inflamatória e antiviral têm sido descritas para DGDGs e seus derivados sintéticos. [16][17] Os flavonoides kaempferol- …”

Section: Resultsunclassified

Constituintes químicos das folhas de Riedeliella graciliflora Harms (Leguminosae)

et al. 2012

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Recebido em 29/6/11; aceito em 28/2/12; publicado na web em 15/6/12 CHEMICAL CONSTITUENTS OF LEAVES FROM Riedeliella graciliflora HARMS (LEGUMINOSAE). A new salicylic acid derivative, pentacosanyl salicylate, was isolated from the leaves of the plant toxic to cattle, Riedeliella graciliflora, in addition to a digalactosyldiacylglycerol (DGDG), 1,2+)-catechin and the dimer (+)-catechin-(4β-8)-catechin, glutinol, squalene, β-sitosterol, stigmasterol, phytol, β-carotene, α-tocopherol and ficaprenol-12. Their structures were determined using spectral techniques (MS, IR, and NMR-1D and 2D) and based on literature data.Keywords: Riedeliella graciliflora; alkyl salicylate; toxic plant. INTRODUÇÃOA intoxicação de ruminantes por plantas tóxicas causa a morte de aproximadamente 1 milhão de animais anualmente no Brasil. [1][2][3] Entre estas plantas tóxicas encontra-se Riedeliella graciliflora Harms Leguminosae, conhecida como falsa-ciganinha, a qual possui porte arbustivo e com ocorrência em cerrados, campos e matas ciliares da região sudeste da América do Sul.4 A intoxicação experimental de gado e animais de laboratório por folhas desta planta resultou em danos histológicos severos em diversos órgãos.5 Outros experimentos demonstraram que 10 g de folhas por kg de peso de animal são suficientes para causar edema e hemorragia no gado. 6 Uma investigação preliminar da composição química desta espécie revelou a presença de proantocianidinas na fração tóxica, 7 sem, contudo, terem sido efetuados o isolamento e a caracterização das mesmas.O impacto econômico resultante das intoxicações de ruminantes por plantas tóxicas confere relevância ao estudo destas espécies, principalmente no intuito de se conhecer os princípios ativos e, assim, possibilitar a racionalização da terapia apropriada.Dando continuidade à nossa linha de pesquisa que visa conhecer a composição química de plantas tóxicas para o gado ocorrentes em Mato Grosso do Sul, 8 o presente trabalho refere-se ao estudo químico das folhas de R. graciliflora. PARTE EXPERIMENTAL Instrumentação e procedimentos geraisForam utilizadas placas de gel de sílica das marcas Whatman e Merck, com indicador de fluorescência UV 254 , empregando-se como revelador solução saturada de sulfato de cério IV em ácido sulfúrico 36%. As separações cromatográficas em coluna foram realizadas utilizando-se gel de sílica 70-230 e 230-400 mesh, marca Acros Organics, e Sephadex LH-20, Sigma-Aldrich. Os experimentos de RMN 1 H e 13 C (uni-e bidimensionais) foram obtidos em espectrômetro Bruker DPX-300 (300/75 MHz), utilizando-se CDCl 3 e CD 3 OD como solventes e o sinal do CHCl 3 ou do hidrogênio residual do CHD 2 OD como referência. Os espectros de IV foram registrados em espectrômetro Bomem-Hartmann & Braun FT, tendo sido as amostras preparadas sob a forma de pastilha de KBr. As medidas de rotação óptica foram determinadas em polarímetro Perkin-Elmer 341 e os espectros de massas obtidos em espectrômetro GCMS-QP2010 Plus, Shimadzu. Material vegetalAs folhas de R. graciliflora foram coletadas em março d...

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“…Bianco et al (1998) identified two digalactosyl glycosides in freshly produced oils, α-1,6-digalactosyl derivative of the 1,2-glycerol diester of linolenic acid and α-1,6-digalactosyl derivative of the glycerol linolenate-oleate diester. It appears that the material in suspension-dispersion plays a significant role against oxidation.…”

Section: Cloudy (Veiled) Virgin Olive Oilmentioning

confidence: 99%

Olive oil

Boskou

2015

Specialty Oils and Fats in Food and Nutrition

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Microcomponents of olive oil. Part II: Digalactosyldiacylglycerols from Olea europaea

Cited by 25 publications

References 6 publications

Endogenous microflora in turbid virgin olive oils and the physicochemical characteristics of these oils

Endogenous microflora in turbid virgin olive oils and the physicochemical characteristics of these oils

Constituintes químicos das folhas de Riedeliella graciliflora Harms (Leguminosae)

Olive oil

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