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Evaluation of Antioxidant and Antimicrobial Potential of Strawberry Tree (Arbutus Unedo L.) Leaf
Hakime Hülya Orak,Hülya Yagar,Sebnem Selen Isbilir,Ahmet Şükrü Demirci,Tuncay Gümüş,Neslihan Ekinci 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.5
In present study, antioxidant and antimicrobial activities of strawberry tree (Arbutus unedo L.) leaves were investigated. Antioxidant activity was determined by methods of DPPH scavenging, β-carotene bleaching,reducing power, metal chelating, superoxide anion scavenging, and hydrogen peroxide scavenging activity. Total phenolic content were determined to be 197.16±1.43mg GAE/g extract in aqueous extract. The EC_50 value of methanolic extracts was found to be 0.423 mg/mL. The extracts of leaves showed nearly 1/4 metal chelating capacity of standard EDTA, high reducing power,superoxide anion scavenging, and hydrogen peroxide scavenging activities. While the strawberry tree leaves exhibited antibacterial activity against Staphylococcus aureus, there was no inhibitory effect against Escherichia coli and Salmonella enteritidis. The strawberry tree leaves exhibited antifungal effect against 2 aflatoxigenic molds namely Aspergillus parasiticus NRRL 2999 and NRRL 465. These results suggest that the strawberry tree leaves may be used as an antioxidant source for pharmaceutical application, nutraceutical and functional food industries.
Serap Duraklı-Velioğlu,İsmail Hakkı Boyacı,Osman Şimşek,Tuncay Gümüş 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.6
The combined effect of temperature, agitationspeed, and light on red pigment production by Monascuspurpureus (M. purpureus) Went DSM 1604 using bugdamaged wheat was studied using an artificial neuralnetwork (ANN). Information retrieved from the ANN wasused to determine the optimal operating conditions forpigment production by M. purpureus using bug damagedwheat meal. The developed ANN had R2 values fortraining, validation, and testing data sets of 0.993, 0.961,and 0.944, respectively. According to the model, thehighest pigment production of 1.874 absorbance units at510 nm (A510 nm) would be achieved at 29oC and 150 rpmunder light conditions. The mean value of the experimentalresults obtained under these optimum conditions was1.787±0.072 A510 nm, corresponding to a pigment yield of35.740 A510 nm/g. The study showed that bug damagedwheat can be used as a substrate for red pigment productionby M. purpureus.