Abstract
Araçá fruit extracts were dried at different air conditions, and an investigation of the impact of drying on the volatile composition and antioxidant activity of araçá extracts was conducted. The effective moisture diffusivity varied between 8.542 × 10−8and 13.34 × 10−8 m2/min. Fruit extracts dried at 50°C and 2.0 m/s had the highest total antioxidant activity (1916.10 mgascorbic acid/100 garaçá). The highest phenolic content (556.28 mgGAE/100 garaçá) was obtained when fruits were dried at 40°C and 1.5 m/s, but the resulting extract contained high amounts of 5-hydroxymethylfurfural (HMF), a contaminant formed in sugar-rich foods as a result of heating. Araçá extracts had similar qualitative profiles of volatile compounds by GC-MS, with caryophyllene being the most abundant terpene, followed by 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one, selina-3,7(11)-diene,γ-terpinene,γ-cadinene, andα-salinene. HMF corresponded to the major peak in all chromatograms, proving that thermal drying affected the quality of the extracts.
Highlights
Psidium cattleianum Sabine belongs to the Myrtaceae family and is commonly referred to as strawberry guava or araça.is plant is distinguished from the common guava, P. guajava, by its more attractive foliage and fruit
Other studies from the literature have indicated that antioxidant activity, phenolic content, and different carotenes may vary according to the fruit genotypes [2, 3]
Heat and mass transfer equations were used in the modeling and simulation of the thin-layer convective drying process of red araçaslices. e effective mass diffusivity ranged from 8.542 × 10−8 to 13.44 × 10−8 m2/min
Summary
Psidium cattleianum Sabine belongs to the Myrtaceae family and is commonly referred to as strawberry guava or araça.is plant is distinguished from the common guava, P. guajava, by its more attractive foliage and fruit. A small number of research papers have analyzed the chemical composition and antioxidant activity of araça. In these studies, different solvents were employed to obtain the pulp extract, such as diethyl ether [5], acetone/water [6], deionized water and acetone [7], hexane, ethyl acetate, and methanol [8], and ethanol [5]. In International Journal of Chemical Engineering the literature, the volatile composition of red araçapulp was analyzed by GC-MS using hydrogen gas at 280°C, resulting mostly in ethanol, α-pinene, (Z)-3-hexenol, (E)-β-caryophyllene, and hexadecanoic acid [5]. In view of the above, the present work aimed at mathematically modeling the thin-layer drying of araçaand at evaluating possible alterations of antioxidant activity and volatile composition of red araçaextracts submitted to different convective drying conditions
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