Bayçın, DenizAltıok, EvrenÜlkü, SemraBayraktar, Oğuz2016-10-192016-10-192007Bayçın, D., Altıok, E., Ülkü, S., and Bayraktar, O. (2007). Adsorption of olive leaf (Olea europaea L.) antioxidants on silk fibroin. Journal of Agricultural and Food Chemistry, 55(4), 1227-1236. doi:10.1021/jf062829o0021-8561http://doi.org/10.1021/jf062829ohttps://hdl.handle.net/11147/2279The adsorption isotherms of oleuropein and rutin were evaluated at different temperatures, pH values, and solid/liquid ratios. The experimental data of adsorption isotherms were well fitted to a Langmuir model. The maximum adsorption capacities were determined as 108 mg of oleuropein/g of silk fibroin and 21 mg of rutin/g of silk fibroin. After adsorption of oleuropein and rutin, the antioxidant capacity of silk fibroin increased from 1.93 to 3.61 mmol of TEAC/g. Silk fibroin also gained antimicrobial activity against Staphylococcus aureus and Klebsiella pneumoniae after adsorption of olive leaf antioxidants. In a desorption process, 81% of rutin and 85% of oleuropein were removed from the adsorbent surface in 70% aqueous ethanol solution. Consequently, silk fibroin was found to be a promising biomaterial for the production of functional food or dietary supplements and for the purification of oleuropein and rutin from olive leaf extracts.eninfo:eu-repo/semantics/openAccessAntimicrobialAntioxidantOlea europaeaOleuropeinOlive leavesSilk fibroinArticle2-s2.0-3424984822510.1021/jf062829o10.1021/jf062829o10.1021/jf062829o