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Chemical and sensory quality of processed carrot puree as influenced by stress-induced phenolic compounds

Talcott, S.T., Howard, L.R.
Journal of agricultural and food chemistry 1999 v.47 no.4 pp. 1362-1366
water content, Daucus carota, cultivars, crop damage, carrots, food processing, vegetable products, flavor, sweetness, bitterness, odors, chemical composition, carboxylic acids, phenolic acids, carotenoids, phytoalexins, sugars, pH, coumarins, food acceptability, genotype, Texas, Georgia
Physicochemical analysis of processed strained product was performed on 10 carrot genotypes grown in Texas (TX) and Georgia (GA). Carrots from GA experienced hail damage during growth, resulting in damage to their tops. Measurements included pH, moisture, soluble phenolics, total carotenoids, sugars, organic acids, and isocoumarin (6-MM). Sensory analysis was conducted using a trained panel to evaluate relationships between chemical and sensory attributes of the genotypes and in carrots spiked with increasing levels of 6-MM. Preharvest stress conditions in GA carrots seemed to elicit a phytoalexic response, producing compounds that impacted the perception of bitter and sour flavors. Spiking 6-MM into strained carrots demonstrated the role bitter compounds have in lowering sweetness scores while increasing the perception of sour flavor. Screening fresh carrots for the phytoalexin 6-MM has the potential to significantly improve the sensory quality of processed products.