RT info:eu-repo/semantics/article
T1 Freeze dried extract from olive leaves: Valorisation, extraction kinetics and extract characterization
A1 Kashaninejad, Mansoore
A1 Sanz Díez, Mª Teresa
A1 Blanco Alcalde, Beatriz
A1 Beltrán Calvo, Sagrario
A1 Niknam, S. Mehdi
K1 Olive leaves
K1 Phenolic compounds
K1 Oleuropein
K1 Mannitol
K1 Kinetic model
K1 Freeze-dried extract
K1 Ingeniería química
K1 Chemical engineering
K1 Alimentos
K1 Food
AB Valorization of olive leaves (OL) in a biorefinery context should include extraction of bioactive compounds, specially taking into account the high content of extractives of this by-product. Extraction of bioactive compounds from Spanish OL (cultivar “Serrana de Espadán”) was studied by conventional and ultrasound assisted extraction (UAE). Faster extraction was observed by UAE, although similar final extraction yield was reached by both technologies. The best extraction solvent was an 80% ethanol hydroalcoholic mixture at a ratio of 20 mL per gram of dried OL (DOL). At these conditions the highest content of oleuropein and luteolin-7-O-glucoside was determined as 31 ± 2 and 4.1 ± 0.2 mg/gDOL. The power law and the Weibull models fitted the total phenolic compounds extraction kinetics quite well. The major soluble carbohydrate was mannitol, with a content of 4.48 ± 0.09 mg/gDOL in the extract. The influence of OL source was also studied and it was concluded that the leaves collected as wastes from the factory presented the highest phenolic yield and antioxidant capacity.The optimum extract was freeze dried resulting in a solid power with more than 11% of oleuropein and 17% of mannitol. Antioxidant activity of the freeze-dried extract was preserved for two months.
PB Elsevier
SN 0960-3085
YR 2020
FD 2020-11
LK http://hdl.handle.net/10259/5472
UL http://hdl.handle.net/10259/5472
LA eng
NO Junta de Castilla y León(JCyL) and the European Regional Development Fund (ERDF)[grant number BU301P18]; and the Agencia Estatal deInvestigación [grant number PID2019−104950RB-I00 / AEI /10.13039/501,100,011,033].Conflict of interestThe authors declare no Conflict of InterestReferencesAbaza, L., Taamalli, A., Nsir, H., Zarrouk, M., 2015. Olive tree (Oleaeuropeae L.) leaves: importance and advances in the analysisof phenolic compounds. Antioxidants 4, 682–698,http://dx.doi.org/10.3390/antiox4040682.Alonso-Ria ̃no, P. , Sanz Diez, M.T., Blanco, B., Beltrán, S., Trigueros,E., Benito-Román, O., 2020. Water ultrasound-assistedextraction of polyphenol compounds from Brewer’s spentgrain: kinetic study, extract characterization, andconcentration. Antioxidants 9, 265,http://dx.doi.org/10.3390/antiox9030265.Alves, L.A., Almeida E Silva, J.B., Giulietti, M., 2007. Solubility ofD-glucose in water and ethanol/water mixtures. J. Chem. Eng.Data 52, 2166–2170, http://dx.doi.org/10.1021/je700177n.Amendola, D., De Faveri, D.M., Spigno, G., 2010. Grape marcphenolics: extraction kinetics, quality and stability ofextracts. J. Food Eng. 97, 384–392,http://dx.doi.org/10.1016/j.jfoodeng.2009.10.033.Ben, M., Guasmi, F. , Ben, S., Radhouani, F. , Faghim, J., Triki, T. ,Grati, N., Ba, C., Lucini, L., Benincasa, C., 2018. The LC-MS / MScharacterization of phenolic compounds in leaves allowsclassifying olive cultivars grown in South. Tunisia 78, 84–90,http://dx.doi.org/10.1016/j.bse.2018.04.005.Benzie, I.F.F., Strain, J.J., 1996. The ferric reducing ability of plasma(FRAP) as a measure of “Antioxidant power”: the FRAP assay.Anal. Biochem. 239, 70–76,http://dx.doi.org/10.1006/abio.1996.0292.Bilgin, M., S ̧ ahin, S., 2013. Effects of geographical origin andextraction methods on total phenolic yield of olive tree (Oleaeuropaea) leaves. J. Taiwan Inst. Chem. Eng. 44, 8–12,http://dx.doi.org/10.1016/j.jtice.2012.08.008.Bouaziz, M., Sayadi, S., 2005. Isolation and evaluation ofantioxidants from leaves of a Tunisian cultivar olive tree. Eur.J. Lipid Sci. Technol. 107, 497–504,http://dx.doi.org/10.1002/ejlt.200501166.Brand-Williams, W. , Cuvelier, M.E., Berset, C., 1995. Use of a freeradical method to evaluate antioxidant activity. LW T - FoodSci. Technol. 28, 25–30,http://dx.doi.org/10.1016/S0023-6438(95)80008-5.
DS Repositorio Institucional de la Universidad de Burgos
RD 01-may-2024