Fruit quality evaluation of strawberries (Fragaria ananassa) grown in California and Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s1784p62h

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  • Five genotypes from California (Ventana, Caniarosa, San Miguel, 13G97, and Venice) and Oregon (Totem, Puget Reliance, Puget Summer, Hood and Independence) were evaluated for quality. The volatile compounds were analyzed using head space solid phase micro extraction-gas chromatography-flame ionization detection (GGFID) and gas chromatography-mass spectrometry (GC-MS). Odor activity values of the compounds were calculated to understand the contribution of the individual compounds to the overall aroma. Ethyl butanoate, furaneol, ethyl hexanoate, ethyl acetate, ethyl isovalerate, hexyl acetate and gamma dodecalactone have the highest odor activity values. The chemical results were correlated with the sensory data obtained from a trained panel of 10 members. Correlation was achieved for the floral, pineapple, banana, peach and caramel notes. The green notes did not correlate with the concentration and odor activity values of the corresponding compounds. This variation could be due to the very high odor activity of other compounds resulting in the masking of the green notes. The sugar, organic acid and ascorbic acid composition was investigated using F]PLC Anthocyanin content was determined by pH differential method. The color properties were studied by measuring tn-stimulus measurements. The average fructose, glucose, sucrose and the total sugar content in the ten cultivars were 2.24, 1.96, 0.92 and 5.13 g/100 g respectively. Total acid content ranged from 0.93 g/100 g to 2.01 g/100 g. Puget Summer had the highest total sugars and Independence had the highest acids and ascorbic acid content. The anthocyanin content varied from 7.1 mg/100 g fruit to 30.52 mg/ba g fruit. The sensory evaluation of the genotypes in terms of sweetness and sourness could be partially explained by sugar/acid ratio. A consumer preference test showed that 'Totem' and 'Puget Reliance' were preferred over 'Camarosa' and 'Ventana' for their aroma.
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