ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Diarylheptanoid-rich extract of grey and black alder barks: an effective dietary antioxidant in mayonnaise

Maris Lauberts, Galina Telysheva, Petras Rimantas Venskutonis, Liga Lauberte, Tatiana Dizhbite, Rita Kazernavičiūte, and Audrius Pukalskas

Latvian State Institute of Wood Chemistry, Riga, Latvia

E-mail: lauberts@edi.lv

Abstract: Diarylheptanoid-rich extracts (DAHEs) isolated from grey and black alder bark with pressurized ethyl acetate were tested in mayonnaise as a dietary antioxidant using the Oxipres method. DAHE contains >700 mg g⁻¹ of oregonin possessing quite similar structure to the well-known dietary antioxidant curcumin, which is widely used as a bioactive constituent of food supplements. Strong radical scavenging capacity of oregonin was clearly demonstrated by the online HPLC–DPPH^∙ scavenging assay. The antioxidative effect of DAHEs in mayonnaise was dose dependent; however, even the lowest concentration (0.5 mg g⁻¹) of DAHE additive increased the induction period of oxidation more than two times. Consequently, DAHE may be considered as a promising natural antioxidant for commercial applications.

Keywords: Antioxidant activity; Oregonin; Mayonnaise; Lipid oxidation; Oxipres

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-016-0017-3

Chemical Papers 71 (5) 1007–1012 (2017)