Phenolics and antimicrobial activity of traditional stoned table olives ‘alcaparra’

Sousa, Anabela; Ferreira, Isabel C.F.R.; Calhelha, Ricardo C.; Andrade, Paula B.; Valentão, Patrı́cia; Seabra, Rosa M.; Estevinho, Letí­cia M.; Bento, Albino; Pereira, José Alberto

doi:10.1016/j.bmc.2006.08.027

Cited by 119 publications

(97 citation statements)

References 28 publications

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“…Daviana cultivar proved to be the most promissory cultivar, presenting the best results, with higher growth inhibition zones and lower MICs. Fruit extracts had a similar antimicrobial activity to hazel leaf extracts for the same cultivars (Oliveira et al, 2007) which were effective at low concentrations (around 0.1 mg/mL); the present extracts are even better than table olive extracts previously studied by us Sousa et al, 2006). The antimicrobial agents added in food generally present problems related to some inherent toxicity (resistance, mutagenesis and carcinogenesis effects, for example) and natural compounds, such polyphenols have gained increasing importance.…”

Section: Antimicrobial Activitymentioning

confidence: 49%

“…There is growing interest in using natural antimicrobial compounds because of consumer's pressure on the food industry to avoid chemical preservatives and of the increasing resistance to antibiotics. With this regard the antimicrobial capacity of phenolic compounds has also been reported (Rauha et al, 2000;Puupponen-Pimiä et al, 2001;Proestos et al, 2005;Sousa et al, 2006;Pereira et al, 2006Pereira et al, , 2007. In fact, there are recent reports about the antioxidant and antiradical activities in extracts of Turkish hazelnut kernel, hazelnut green leafy cover (Alasalvar et al, 2006b), and other hazelnut byproducts such as hazelnut tree leaf (Oliveira et al, 2007;Shahidi et al, 2007).…”

Section: Introductionmentioning

confidence: 94%

“…The screening of antibacterial activities against Gram+ and GramÀ bacteria and fungi and the determination of the minimal inhibitory concentration (MIC) were achieved by an adaptation of the agar streak dilution method based on radial diffusion (Hawkey and Lewis, 1994;Ferreira et al, 2004;Sousa et al, 2006). Suspensions of the microorganism were prepared to contain approximately 10 8 cfu/mL, and the plates containing agar medium were inoculated (100 lL; spread on the surface).…”

Section: Test Assays For Antimicrobial Activitymentioning

confidence: 99%

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Chemical composition, and antioxidant and antimicrobial activities of three hazelnut (Corylus avellana L.) cultivars

Oliveira

Sousa

Morais

et al. 2008

Food and Chemical Toxicology

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137

104

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Hazelnut (Corylus avellana L.) is a very popular dry fruit in the world being consumed in different form and presentations. In the present work, three hazelnut cultivars (cv. Daviana, Fertille de Coutard and M. Bollwiller) produced in Portugal, were characterized in respect to their chemical composition, antioxidant potential and antimicrobial activity. The samples were analysed for proximate constituents (moisture, fat, crude protein, ash), nutritional value and fatty acids profile by GC/FID. Antioxidant potential was accessed by the reducing power assay, the scavenging effect on DPPH (2,2-diphenyl-1-picrylhydrazyl) radicals and b-carotene linoleate model system. Their antimicrobial capacity was also checked against Gram positive (Bacillus cereus, B. subtilis, Staphylococcus aureus) and Gram negative bacteria (Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae) and fungi (Candida albicans, Cryptococcus neoformans). Results showed that the main constituent of fruits was fat ranging from 56% to 61%, being the nutritional value around 650 kcal per 100 g of fruits. Oleic was the major fatty acid varying between 80.67% in cv. F. Coutard and 82.63% in cv. Daviana, followed by linoleic, palmitic, and stearic acids. Aqueous hazelnut extract presented antioxidant activity in a concentration-dependent way, in general with similar behaviour for all cultivars. Hazelnut extracts revealed a high antimicrobial activity against Gram positive bacteria (MIC 0.1 mg/ mL) showing a good bioactivity of these fruits.

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Section: Antimicrobial Activitymentioning

confidence: 49%

Section: Introductionmentioning

confidence: 94%

Section: Test Assays For Antimicrobial Activitymentioning

confidence: 99%

See 1 more Smart Citation

Chemical composition, and antioxidant and antimicrobial activities of three hazelnut (Corylus avellana L.) cultivars

Oliveira

Sousa

Morais

et al. 2008

Food and Chemical Toxicology

Self Cite

137

104

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“…Its absence in the pulp of olives could be related to its sensitivity to phenolic compounds and to low value of a w . In fact previous works Sousa et al, 2006Sousa et al, , 2008 proved that olive pulp is rich in phenols that showed antimicrobial activity. C. glabrata and C. krusei have emerged as important pathogens, whose clinical isolates have been increasing, being C. glabrata associated, specially, to urinary tract, mucosal areas and lungs (Hazen, 1995).…”

Section: Isolation and Identification Of Yeastsmentioning

confidence: 91%

Microbiological characterization of table olives commercialized in Portugal in respect to safety aspects

Pereira

Bento

et al. 2008

Food and Chemical Toxicology

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a b s t r a c t Table olives are a traditional component of the Mediterranean diet and are largely consumed in the world. There are different trade treatments that originate different types of olives. The aim of the present work was to proceed to the microbiological characterization of table olives commercialized in the Portuguese market, with respect to their microbiological safety. The microbiological characterization was made in the olive pulp and packing brine of thirty-five table olives samples of different types and trade treatments, namely natural olives Cv. Galega (NOG), natural turning colour olives (NTCO), green olives (GO), black ripe olives (BO) and natural olives purchased in the traditional market and obtained from traditional producers (NOt). Simultaneously it was verified specific legislation of the table olives in what it concerns to labeling rules, pH values and the identification of isolated yeasts. In general, table olives consumed showed acceptable security with exception of four NOt samples that presented Staphylococcus aureus. In a considerable number of samples high number of microorganisms indicators of contaminations were observed that reveals the need of optimization the hygienic procedures during production process to improve the quality and safety of table olives. During the work seven yeasts were isolated from olive pulp and brine.

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“…Several of these compounds had excellent antibacterial activities also against Vibrio cholera (Martini et al, 2004b). Some mechanisms of antimicrobial activity of phenolic compounds includes their ability to denature microbial proteins as surface-active agents (Sousa et al, 2006). Phenolic compounds may also react with cellular membrane components and impair the function and integrity of cells (Raccach, 1984).…”

Section: Antimicrobial Assaymentioning

confidence: 99%

Polarity of extracts and fractions of four Combretum (Combretaceae) species used to treat infections and gastrointestinal disorders in southern African traditional medicine has a major effect on different relevant in vitro activities

Ahmed

McGaw

Elgorashi

et al. 2014

Journal of Ethnopharmacology

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Graphical abstractPhenolic-enriched extracts of four Combretum species namely Combretum bracteosum, Combretum padoides, Combretum vendae and Combretum woodii used in South African traditional medicine to treat various ranges diseases were evaluated against some diarrhoeal aetiologies. All the crude extracts and their fractions of varied polarities had good antimicrobial (non-polar fractions) or good antioxidant (polar fractions) activity. The crude extract of all the plant species were cytotoxic to Vero cell lines but did not lead to COX enzyme inhibition. Phenolic-enriched extractsFour Combretum species traditionally used for treating infectious and gastrointestinal complications in southern Africa In vitro assays: antioxidant, anti-inflammation, antimicrobial, cytotoxicity AbstractEthnopharmacological importance: Infections and gastrointestinal (GIT) disorders such as diarrhoea causes many problems in human health and animal production. Many Combretum species are used in traditional medicine to treat various diseases by rural people in Africa and Asia. Much of the work done to date on some species to validate their ethnopharmacological use was on the non-polar or intermediate polarity components. Many species are yet to be studied against relevant disease parameters using more polar extracts. Aims:The polar components were extracted and fractionated by solvent-solvent fractionation to yield fractions of different polarities. The activity of these fractions on different parameters that could be involved in infectious and gastrointestinal track (GIT) disorders was investigated. The cytotoxic activities of the extracts were also determined to evaluate the potential of these extracts to combat diarrhoea in production animals. Materials and Methods:Phenolic-enriched leaf extracts of Combretum bracteosum (Cob), Combretum padoides (Cop), Combretum vendae (Cov) and Combretum woodii (Cow) were obtained by extracting with a mixture of 70% acetone acidified with 1% HCl and n-hexane. The extract was sequentially treated by solvent-solvent fractionation with dichloromethane, ethyl acetate, and butanol to yield fractions with a large variation in polarity. The phenolic constituents of the extracts and fractions were determined using standard procedures. The antioxidant activities were determined using various standard methods. The minimum inhibitory concentrations (MICs) of the crude extracts and fractions against four bacterial and three fungal strains were assessed with a microplate serial dilution method.Cyclooxygenase (COX) and lipoxygenase (LOX) enzyme inhibitory assays and cytotoxicity studies against Vero cells were also carried out.Result: Some of the fractions had much higher antioxidant activity than the positive controls. The average EC 50 values of the extracts for the DPPH and ABTS antioxidant assays were 0.21-12 µg/ml (Cop), 0.25-16 µg/ml (Cov), 0.33-9.41 µg/ml (Cow) and 4.97-85 µg/ml (Cob) respectively while the mean EC 50 values for the positive controls ascorbic acid and trolox were 1.28-1.51 and 1.02-1.19 ...

show abstract

Phenolics and antimicrobial activity of traditional stoned table olives ‘alcaparra’

Cited by 119 publications

References 28 publications

Chemical composition, and antioxidant and antimicrobial activities of three hazelnut (Corylus avellana L.) cultivars

Chemical composition, and antioxidant and antimicrobial activities of three hazelnut (Corylus avellana L.) cultivars

Microbiological characterization of table olives commercialized in Portugal in respect to safety aspects

Polarity of extracts and fractions of four Combretum (Combretaceae) species used to treat infections and gastrointestinal disorders in southern African traditional medicine has a major effect on different relevant in vitro activities

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