Effect of Olive Leaves Addition during the Extraction Process of Overmature Fruits on Olive Oil Quality

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Ricardo Malheiro (Author) Other; Helder Teixeira (Author) Other; Albino Bento (Author) Other; Jose Alberto Pereira (Author) Other; Susana Casal (Author) FFUP

Journal

Title: Food and Bioprocess Technology

Vol. 6

ISSN: 1935-5130

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 44 Citations

Scopus - 49 Citations

Scientific classification

FOS: Agrarian Sciences > Other Agrarian Sciences

Other information

Authenticus ID: P-002-111

Abstract (EN): The harvest period is one of the most important factors influencing olive oil quality. This period is extended for several months and the late-extracted olive oils are characterized by quality loss and reduced resistance to oxidation. The aim of this work was to verify the effect of olive leaves addition during the oil extraction process in the olive oils quality and composition. In two consecutive years (2009 and 2010), different olive leaves amounts (1%, 2.5%, 5% and 10% w/w) were added during the extraction process of cv. Cobran double dagger osa olive fruits, collected in the late season. Standard quality parameters, oxidative stability, fatty acids profile, tocopherols, chlorophylls, and carotenoids contents were evaluated. Olive leaves addition induces a slight increase in acidity, peroxide value, K-232, and K-270 without compromising olive oils classification, but the resistance to oxidation was significantly improved. Vitamin E increased nearly 30% with 10% of leaves added mainly due to the considerable increase in alpha-tocopherol. A similar effect was observed in the contents of chlorophylls (chlorophyll a and pheophytin a) and carotenoids (lutein and beta-carotene), that attributed a more intense greener pigmentation and enhanced nutritional attributes. Significant correlations were observed for several parameters with the amounts of leaves added. Moreover, leaves addition modified the characteristics and composition of the olive oils in a way that was possible to discriminate and to classify each group.

Language: English

Type (Professor's evaluation): Scientific