Effect of Ethyl Oleate Pretreatment on Drying of Ginger: Characteristics and Mathematical Modelling

Abstract

Ginger is of high value and export oriented commodity crop, which plays an important role in agricultural sector. Proper drying techniques are required to capitalize this crop. In the present study, the effect of chemical pretreatment of alkaline ethyl oleate on drying behaviour of ginger was investigated and compared with untreated ginger at selected temperatures of 45, 55, and 65°C at a constant air velocity of 1.8 m/s. The drying rate curves showed that drying occurred in falling rate period and the drying times of pretreated ginger were shorter than those of untreated ginger. Thin-layer drying models such as Newton, Page, Modified Page, Henderson and Pabis, and Wang and Singh were evaluated based on statistical criteria. The Page model was found to be a better model for describing the drying kinetics of the ginger. The rehydration capacity of pretreated sample was more than that of untreated sample and increased with drying temperature. The transport of water during drying was temperature dependent and described by Fick’s equation. The effective diffusivity varied from to m2/s and to m2/s with drying temperature for untreated and pretreated ginger slices, respectively.

Retracted: Experimentally investigated the asparagus (Asparagus officinalis L.) drying with flat‐plate collector under the natural convection indirect solar dryer

“…However, the moisture removing rate is also dependent on the ease of heat transfer. Forced convection drying system has been reported to be best suitable for faster drying as the value of the coefficient of convective heat transfer associated with them is more than the natural convection drying (Azharul Karim & Hawlader, 2005;Deshmukh et al, 2013Deshmukh et al, , 2014. From Figure 4, it has been observed that the values of convective heat transfer coefficient decrease with the progression of drying months, that is, June, July, and August 2016.…”

“…Asparagus is the most important cash crop of the world, cultivated in China, Pakistan, Indian, Afghanistan, Uzbekistan, Japan, and Indonesia. The china is the largest producer of Asparagus, contributing about 45.48% of the total world's Asparagus production with a total production of 17 million tons a year (Deshmukh, Varma, Yoo, & Wasewar, 2013).…”

Investigation of Solar Drying of Ginger (Zingiber officinale): Emprical Modelling, Drying Characteristics, and Quality Study

“…After rehydration, samples were taken out; surface moisture was absorbed carefully with tissue paper and then weighed. The rehydration capacity was calculated as follows [10]:…”

Effects of Various Nonthermal Pretreatments on the Physicochemical Properties of Dried Ginger (Zingiber officinaleRoscoe) Slices from Two Geographical Locations

“…These beneficial health effects are ascribed to the presence of volatile oils, gingerols, shogaols, and high antioxidant compounds (Jelled et al., ; Park & Jung, ). It is used in various ways such as fresh ginger, bleached dried ginger, ginger powder, brined ginger, ginger oil, and dried ginger (Deshmukh, Varma, Yoo, & Wasewar, ). It is also employed as a raw material for the cosmetic, pharmaceutical, and the food industries in the production of perfume, toiletries, shampoo, hair conditioner, baking products, meat products, wine, and other medicinal products due to its high antioxidant properties (Wang et al., ).…”