title: Impact of cultivar, harvesting time, and seasonal variation on the content of biophenols in olive mill waste.
abstract: Olive mill waste (OMW) contains substantial amounts of valuable antioxidant biophenols that can be recovered for possible applications in food, pharmaceutical, and cosmetic industries. However, the impact of cultivar, harvesting time, and seasonal variation on the phenolic composition of OMW has not yet been assessed. Total phenols, antioxidant activity, and phenol profiles of OMW extracts from five different Australian-grown cultivars (Barnea, Correggiola, Manzanillo, Mission, and Paragon) were studied at four different harvesting times in the 2004 season. The impact of seasonal variation was assessed by comparing total phenol content, antioxidant activity, and phenol profile of two cultivars (Correggiola and Mission) harvested in the 2004 and 2005 seasons. The phenol content and antioxidant activity at different harvesting times were mainly a function of the olive cultivar. Harvesting time had a quantitative effect rather than a qualitative effect on the phenol profile. Intercultivar and harvesting time variation accounted for a 2-5-fold change in the total phenol and antioxidant capacity, while levels of individual biophenols experienced up to 50-fold change. The phenol content and antioxidant capacity of OMW significantly changed between seasons with different variation patterns for different cultivars.
authors.affiliation: E. H. Graham Centre for Agricultural Innovation, School of Agricultural and Wine Sciences, Charles Sturt University, Wagga Wagga, NSW 2678, Australia.
authors.forename: Hassan K
authors.initials: HK
authors.lastname: Obied
authors.forename: Danny
authors.initials: D
authors.lastname: Bedgood
authors.forename: Rod
authors.initials: R
authors.lastname: Mailer
authors.forename: Paul D
authors.initials: PD
authors.lastname: Prenzler
authors.forename: Kevin
authors.initials: K
authors.lastname: Robards
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D005638:Fruit / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis*; D031658:Olea; D010636:Phenols / Q000032:analysis*; D012621:Seasons; D013045:Species Specificity; D013997:Time Factors
chemical_list: D000975:Antioxidants; D007220:Industrial Waste; D010636:Phenols