Poster Topical Area: Dietary Bioactive Components

Location: Hall D

Poster Board Number: 348

P08-090 - California Date Varieties are Rich in Bioactive Compounds Fibers and Proanthocyanidins

Monday, Jun 11
8:00 AM – 3:00 PM

California dates Deglet Noor and Medjool are the two main varieties. These differ in texture, taste, size and composition. The objective of this study was to analyze the composition of bioactive components of both varieties of fresh, ripe dates for phenolic compounds, fibers and composition. Methods of analysis for minerals and nutrients were AOAC; polyphenols were identified by positive reflectron mode MALDI-TOF mass spectra and RP-HPLC-DAD.

Proanthocyanidins (PAC) found in dates can be partitioned into two categories, soluble (extractable) and insoluble (non-extractable) PAC. Insoluble PAC are bound to plant cell wall components such as fiber or protein. Differences in polyphenol and fiber content and composition may influence sensory attributes of dates such as fruit softness and integrity. Both soluble and insoluble PAC may be considered bioavailable, as these components interact with the gut associated lymphoid tissue (GALT), intestinal epithelial surfaces and intestinal microflora during the digestive process. Our research show that the major polyphenol compound in dates was hydroxycinnamic acids, specifically, caffeic, p-coumaric and ferulic acids, as well as cinnamic acid derivatives. The soluble PAC found in dates are in its majority B-type interflavan bonds. Recent research has demonstrated that date polyphenols (inclusive of proanthocyanidins) show bioactivity through modulation of the nuclear receptor (famesoid x receptor) which is responsible for maintaining triglyceride and cholesterol homeostasis. Suberin compounds, specifically an ester of ferulic acid with long-chain hydroxyfatty acids (C16, C18), are another class of polyphenol derivatives which have recently been characterized in dates. Suberins are waxy substances present in cell walls which also may influence fruit structure and impart bioactivity. Deglet Noor and Medjool varieties of dates were analyzed for nutrients and found to be similar in water (20.2 vs. 20.3 %, respectively). Some differences in minerals may indicate types of fiber structures. Calcium in Medjools was slightly higher than the Deglet Noor (52.8 vs 39.6 mg/100 grams, p < 0.0005). Detailed analyses are needed to determine if calcium is an indicator of pectin structures. Potassium values for Medjools were higher than Deglet Noor (675 vs 554 mg/100, p

Funding Source: California Date Commission provided funding for this research.

CoAuthors: Emilia Alfaro-Viquez – University of Wisconsin, Madison; Christian Krueger – University of Wisconsin, Madison; Jess Reed – University of Wisconsin, Madison

Charlene J. Rainey

Date Research Institute
San Juan Capistrano, California