• Parasites, Hosts and Diseases
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• v.50 no.1
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• pp.53-56
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• 2012

Treatment of hydatid disease is mainly surgical, with medical treatment being reserved as a coadjuvant treatment. Use of effective scolicidal agents during surgery of cystic echinococcosis is essential to reduce the recurrence rate. The goal of this study was to evaluate the in vitro scolicidal effects of hydroalcoholic extracts of $Satureja$ $khuzestanica$ leaves and aqueous extracts of $Olea$ $europaea$ leaves on hydatid cyst protoscolices. $Echinococcus$ $granulosus$ protoscolices were collected from the liver of sheep infected with the hydatid cyst. Various concentrations of plant extracts were used in different exposure times for viability assay of protoscolices. Among the olive leaf extracts tested, 0.1% and 0.01% concentrations had strong scolicidal effects in 120 min. $S.$ $khuzestanica$ 0.1% had very strong scolicidal effects in 30, 60, and 120 min of exposure times and the mortality rate decreased with the lower concentration. The finding have shown that the scolicidal activity of $S.$ $khuzestanica$ against cystic echinococosis protoscolices were more effective, while the $O.$ $europaea$ extract showed less effects.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2003.10a
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• pp.184-184
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• 2003

• Korean Journal of Food Science and Technology
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• v.40 no.3
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• pp.257-264
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• 2008

In this study, the antioxidant activities and nitrite scavenging abilities of olive leaf fractions acquired from plants cultivated in Australia (Olea europaea L. var. Picual) and Spain (Olea europaea L. var. Hojiblanca) were evaluated. Oleuropein was found to be the major phenolic compound in the leaves, with the butanol fractions presenting the highest contents. Antioxidant activity was evaluated in terms of superoxide dismutase (SOD)-like activity, 1,1-diphenyl-2-picryl hydroxyl (DPPH) radical scavenging activity, and the inhibitory effect on the auto-oxidation rate of linoleic acid. The SOD-like activities of the olive leaf extracts ranged from 0 to 36.8%. DPPH radical scavenging activity was highest in the ethanol extract of the Australian cultivated olive leaves. Finally, the chloroform fractions of the extracts showed inhibitory effects on the auto-oxidation rate of linoleic acid as well as nitrite scavenging ability.

• Korean Membrane Journal
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• v.8 no.1
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• pp.58-66
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• 2006

The ${\beta}-glucosidase$ from olive fruit is of particular interest compared to the ones from other sources because it has shown to have high specifity to convert the oleuropein into dialdehydes, which have antibacterial activity and are of high interest for their application in the food and pharmaceutical fields. The enzyme is not yet commercially available and advanced clean and safe technologies for its purification able to maintain the functional stability are foreseen. The purification of this protein from fruit extracts has been already tempted by electrophoresis but either enzyme deactivation or high background with unclear profiles occurred. In this work, fruit extracts obtained from the ripening stage that showed the highest enzyme activity have been processed by diafiltration and ultrafiltration. Asymmetric membranes made of polyamide or polysulphone having 50 and 30 kDa molecular weight cut-off, respectively, were tested for the diafiltration process. Ultrafiltration membranes made of polyethersulfone with 4 kDa molecular weight cut-off were used to concentrate the dia-filtered permeate solutions. The efficiency of the separation processes was evaluated byenzyme activity tests using the hydrolysis of p-D-nitrophenyl-${\beta}$-D-glucopyranoside (pNPGlc) as reaction model. Qualitative and quantitative electrophoresis were applied to analyze the composition of protein solution before and after the membrane separation; in addition dot blot and western blot analyses were applied to verify the presence of ${\beta}-glucosidase$ in the processed fractions. The overall results showed that the ${\beta}-glucosidase$ functional stability was preserved during the membrane operations and the removal of 20 kDa proteins allowed to increase the specific activity of the enzyme of about 52% compared to the one present in the initial fruit extract.

• Asian-Australasian Journal of Animal Sciences
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• v.28 no.4
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• pp.538-543
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• 2015

This experiment was conducted to measure the effects of olive leaf powder on performance, egg yield, egg quality and yolk cholesterol level of laying hens. A total of 120 Lohmann Brown laying hens of 22 weeks old were used in this experiment. The birds were fed on standard layer diets containing 0, 1%, 2%, or 3% olive leaf powder for 8 weeks. Egg weight and yield were recorded daily; feed intake weekly; egg quality and cholesterol content at the end of the trial. Olive leaf powder had no effect on feed intake, egg weight, egg yield and feed conversion ratio (p>0.05) while olive leaf powder increased final body weight of hens (p<0.05). Dietary olive leaf powder increased yellowness in yolk color (p<0.01) without affecting other quality parameters. Yolk cholesterol content was tended to decrease about 10% (p>0.05). To conclude, olive leaf powder can be used for reducing egg yolk cholesterol content and egg yolk coloring agent in layer diets.

• Food Science and Biotechnology
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• v.18 no.3
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• pp.818-821
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• 2009

Total phenol, total flavonoid, reducing powder, electron donating activity, ascorbic acid equivalent antioxidant capacity, antimicrobial and antiproliferative activities of olive leaf extracts were investigated. The contents of total phenol and flavonoid were 257.48 and 92.33 mg in 100 g of olive leaf extract, respectively. The reducing power of the olive leaf extract increased with concentration increasing. Electron donating activity was high in 100 ${\mu}g/mL$ treated olive leaf extract as 95.20%. The ascorbic acid equivalent antioxidant capacity of the olive leaf extract was 68.93 mg/g olive leaf extract. The olive leaf extracts showed relatively high antimicrobial activity against Escherichia coli, Salmonella typhimurium, Bacillus cereus, Staphylococcus aureus, Listeria monocytogenes, and Pseudomonas aeruginosa. All of the cancer cell lines including MKN45, HCT116, NCI-H460, and MCF7 have 70-81% as effective growth inhibition.

• Korean journal of applied entomology
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• v.62 no.2
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• pp.103-107
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• 2023

Fifteen insect species have been identified as olive pests through a survey conducted in olive orchards on Jeju island from 2019 to 2022. The occurrence and fruit damage caused by Lepidopteran and hemipteran were significant severity. Among the moths, the order in which the population was large was as follows: Alpita nigropunctalis, Aterpia circumfluxana, Homona magnanima, and Adoxophyes honmai. These lepidopteran species primarily caused damage to leaves, but P. nigropunctalis inflicted severe damage to the fruits by feeding on the inside. Three stink bugs, namely Plautia stali, Halyomorpha halys, and Chinavia hilaris, were commonly observed and responsible for damaging olive furits. Chrysomphalus bifasciculatus and Pseudaulacaspis pentagona were found to occur and damaged fruit in non-controlled orchard. Prociphilus oleae, which is being recognized for the first time in Korea, and Ricania shantungensis discovered for the first timein olive orchard. Saissetia olea, a quarantine pest, was found in one farm, but subsequent pesticide spraying resulted in their elimination. Although severe damage was inflicted upon the olives, no perforated pests were found during the survey.

• Food Science and Biotechnology
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• v.18 no.4
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• pp.965-970
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• 2009

Oleuropein content of olive leaf extracts (OLE; ethanol extract) was evaluated by high performance liquid chromatography analysis. Oleuropein contents were $4.21{\pm}0.57$, $3.92{\pm}0.43$, $0.32{\pm}0.03$, $5.76{\pm}0.32$, and $32.47{\pm}0.25$ mg/100 g for ethanol extract, and hexane, chloroform, ethyl acetate, and butanol fraction, respectively. The removal of DPPH free radical increased in OLE and all 5 fractions of OLE in a concentration dependent manner. In order to investigate the antioxidant effect of OLE in vitro, 80%(v/v) ethanol OLE, $H_2O_2$, or combined treatment of 80%(v/v) ethanol OLE and $H_2O_2$ were applied on mouse embryonic fibroblast (MEF) cells. Cells were damaged by oxidative stress decreased their viability followed by increasing concentration of $H_2O_2$, but co-treatment of OLE and $H_2O_2$ showed an increase in cell growth about 20% compare to the cells treated with $H_2O_2$. OLE suppresses cytotoxicity induced by $H_2O_2$ in dose dependent manner. OLE treatment on MEF cells was also examined by analyzing cell cycle and apoptotic rate using flow cytometry. Apoptotic and necrotic cell accumulation was decreased in addition of OLE to $H_2O_2$ compare to the oxidative damaged cells. Taken together, these results demonstrated that OLE suppresses cytotoxicity induced by $H_2O_2$ and protect cells against oxidative stress on MEF cells.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.5
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• pp.2015-2020
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• 2012

Oleanolic acid (OA) is a naturally occurring triterpenoid in food materials and is a component of the leaves and roots of Olea europaea, Viscum album L., Aralia chinensis L. and more than 120 other plant species. There are several reports validating its antitumor activity against different cancer cells apart from its hepatoprotective activity. However, antitumor activity against skin cancer has not beed studied well thus far. Hence the present study of effects of OA against HaCaT (immortalized keratinocyte) cells - a cell-based epithelial model system for toxicity/ethnopharmacology-based studies - was conducted. Radical scavenging activity ($DPPH{\cdot}$) and FRAP were determined spectrophotometrically. Proliferation was assessed by XTT assay at 24, 48 and 72 hrs with exposure to various concentrations (12.5-200 ${\mu}M$) of OA. Apoptotic induction potential of OA was demonstrated using a cellular DNA fragmentation ELISA method. Morphological studies were also carried out to elucidate its antitumor potential. The results revealed that OA induces apoptosis by altering cellular morphology as well as DNA integrity in HaCaT cells in a dose-dependent manner, with comparatively low cytotoxicity. The moderate toxicity observed in HaCaT cells, with induction of apoptosis, possibly suggests greater involvement of programmed-cell death-mediated mechanisms. We conclude that OA has relatively low toxicity and has the potential to induce apoptosis in HaCaT cells and hence provides a substantial and sound scientific basis for further validation studies.

• Food Science and Biotechnology
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• v.18 no.5
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• pp.1193-1198
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• 2009

Ethylacetate and butanol fractions of leaf extracts (OLE) showed the higher contents of total phenolic compounds than hexane and water fractions. Oleuropein contents were $4.21{\pm}0.57,\;3.92{\pm}0.43,\;0.32{\pm}0.03,\;5.76{\pm}0.32$, and $32.47{\pm}0.25mg$/100g for ethanol extract, and hexane, chloroform, ethyl acetate, and butanol fraction, respectively. Treatment of ultraviolet-B (UVB) irradiated cells with 3 OLEs prepared by using ethylacetate and butanol at concentrations 0.001, 0.005, and 0.01% respectively showed significant recovery of cell viabilities. Treatment of dexametason 1 mM reduced tumor necrotic factor (TNF)-${\alpha}$ secretion by about 40%. UVB irradiated immortalized human keratinocytes (HaCaT) cells were treated with 3 different OLEs at the same concentrations. Ethylacetate fraction showed the strongest inhibition activity with respect of reduction of the elevated (TNF)-${\alpha}$. Cytotoxicity of OLEs on the B16-F1 cells was evaluated through thiazolyl blue tetrazolium bromide (MTT) assay. Ethylacetate fraction has no cytotoxicity in the range of 0.005-0.01%. A slight cytotoxicity was observed at the concentration of 0.1% butanol fraction of OLE that caused 10% decrease in cell viability.