Intermittent and Continuous Microwave-Convective Air-Drying Characteristics of Sage (Salvia officinalis) Leaves
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Dosyalar
Tarih
2012
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The effect of microwave-convective air-drying (continuous and intermittent) and convective air-drying of sage (Salvia officinalis) on color and essential oil content were studied. For microwave-convective air-drying, four pulse ratio levels (PR1, PR2, PR3, and PR4) at 25 A degrees C drying air temperature were used and the average drying rates were 0.404, 0.158, 0.114, and 0.085 kg H2O kg(-1) DM min(-1) for PR1, PR2, PR3, and PR4, respectively. For convective air-drying, two drying temperatures of 40 and 50 A degrees C were examined and the average drying rates were 0.005 and 0.006 kg H2O kg(-1) DM min(-1) for 40 and 50 A degrees C, respectively. The experimental data were fitted to 11 different moisture ratio models to describe the drying kinetics under various drying conditions. Page model was found satisfactory to describe the drying curves of sage leaves. Comparing with the fresh sage, lightness (L*), greenness, and yellowness decreased for all drying applications. Lightness, greenness, and yellowness of the convective air-dried sage leaves were higher than those of microwave-convective air-dried sage leaves. The deviation from fresh product color (Delta E*) increased as the pulse ratio or the drying air temperature increased. The total quantity of essential oils of sage decreased considerably during microwave-convective air-drying whereas the loss of essential oils was limited during air-drying.
Açıklama
Anahtar Kelimeler
Salvia officinalis, Microwave drying, Drying characteristics, Color, Essential oil
Kaynak
Food and Bioprocess Technology
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
5
Sayı
5
