Olea europaea L. leaf extract and derivatives: antioxidant properties.
This paper reports a very simple and fast method to collect eluates with high amounts of hydroxytyrosol, biotransforming Olea europaea L. leaf extract by a thermophilic beta-glycosidase immobilized on chitosan. Some phenolic compounds in the leaf tissue and in the eluates obtained by biotransformation are identified. To propose the eluates as natural substances from a vegetal source, their antioxidant properties have been compared with those of the leaf extract from which they are originated. The eluates possess a higher concentration of simple phenols, characterized by a stronger antioxidant capacity, than those available in extra virgin olive oils and in many tablets of olive leaf extracts, commercially found as dietetic products and food integrators.
Briante
Raffaella
R
Istituto di Biochimica delle Proteine ed Enzimologia del CNR, Via Marconi 10, 80125 Napoli, Italy.
Patumi
Maurizio
M
Terenziani
Stefano
S
Bismuto
Ettore
E
Febbraio
Ferdinando
F
Nucci
Roberto
R
D000975:Antioxidants / Q000032:analysis*; D002849:Chromatography, Gas; D004800:Enzymes, Immobilized; D008401:Gas Chromatography-Mass Spectrometry; D006026:Glycoside Hydrolases; D029592:Oleaceae / Q000737:chemistry*; D000069463:Olive Oil; D010636:Phenols / Q000032:analysis; D010626:Phenylethyl Alcohol / Q000031:analogs & derivatives* / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry
D000975:Antioxidants; D004800:Enzymes, Immobilized; D000069463:Olive Oil; D010636:Phenols; D010936:Plant Extracts; D010938:Plant Oils; C005975:3,4-dihydroxyphenylethanol; D006026:Glycoside Hydrolases; D010626:Phenylethyl Alcohol