Infrared, Convective, and Sequential Infrared and Convective Drying of Wine Grape Pomace

Sui, Yinqiang; Yang, Jihong; Ye, Qiuhong; Li, Hua; Wang, Hua

doi:10.1080/07373937.2013.853670

Cited by 68 publications

(40 citation statements)

References 40 publications

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“…A similar observation was reported by Sui et al, [50] Togrul, [51] and Puente-Diaz et al, [52] who modeled the drying process of wine grape pomace, apple slices, and Murta berries. In contrast, Togrul and Pehlivan, [53] Sacilik and Elicin, [54] Wang et al, [55] Doymaz, [56] and Mohammadi et al [57] showed that the logarithmic model could describe the drying behavior of a quantity of biological materials more accurately than the other thin-layer models, whereas other researchers [58][59][60][61] reported that the Page model is the best descriptive model.…”

Section: Empirical Modelingsupporting

confidence: 71%

Drying and Shrinkage Kinetics of Solid Waste of Olive Oil Processing

2015

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The problems created in managing olive mill wastewater (OMW) have been extensively investigated during the last few years. In most cases, dehydration of olive mill wastes is a first step before developing further applications. The subject of this study was to determine the drying behavior of OMW solid fraction (OMWS). Drying (moisture vs time) and shrinkage (image vs time) data were obtained on slabs of OMWS in an air dryer operated at 60-80 C. The effective diffusivity was determined using (a) the simplified solution of Fick's second law and (b) the method of slopes of the drying curve, taking into account the effect of moisture content on diffusivity and sample shrinkage. The combined effect of moisture content and temperature on effective diffusivity was expressed by an empirical model. In addition, each moisture loss and shrinkage curve was fit to 10 simplified drying models. The dependence of the best descriptive model constants on drying temperature was expressed by an appropriate type of model.

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Section: Empirical Modelingsupporting

confidence: 71%

Drying and Shrinkage Kinetics of Solid Waste of Olive Oil Processing

2015

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“…In recent years, a number of advanced drying techniques have been developed for the drying of plant materials for various downstream applications. Current drying methods can be divided into three groups including (1) convectional drying, for example hot-air/oven drying, [4][5][6][7][8][9] conventional/low temperature-air drying, [9] vacuum/vacuum oven drying, [8][9][10][11][12] sun drying, [9,10,13] under shade drying, [10,14] heat pumpdehumidified air drying, [5] low-pressure superheated steam drying, [4] freeze drying; [5,8,10] (2) radiation drying such as microwave drying, [5,9,13,15] infrared drying; [6,7,9] and (3) combined drying or novel drying such as microwave-assisted hot-air drying, [6] infraredcombined hot air drying, [4,7] hot air-assisted radio frequency drying, [6] vacuummicrowave drying, [11,16] combined infrared-vacuum drying, [17] and combined lowpressure superheated steam drying and far-infrared radiation. [18] Xu [19,20] reported that vacuum freeze drying followed by hot air drying (FAD) consumed less energy than hot air drying followed by vacuum freeze drying (AFD), and was comparable to convective hot air drying (AD) and vacuum freeze drying (FD).…”

Section: Introductionmentioning

confidence: 99%

Phytochemical retention and antioxidant capacity of xao tam phan (Paramignya trimera) root as prepared by different drying methods

et al. 2015

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Xao tam phan (Paramignya trimera (Oliv.) Guillaum) has been used as a herbal medicine for the treatment of cancer or cancer-like diseases in recent years, particularly in Vietnam. Drying is an important step for preparation of dried materials for storage and further investigation; however, the effects of drying must be taken into account when processing samples, as this can have profound effects on the stability of phytochemical compounds and the biological activity of the dried P. trimera root. As such, this study assessed the effects of four different drying methods (conventional, hot-air, vacuum, and microwave) on phytochemical retention and antioxidant capacity of the P. trimera root, to identify an optimal drying method for the P. trimera root. The results showed that the drying methods significantly affected phytochemical levels and antioxidant capacity of the P. trimera root, and that among the four drying methods tested, microwave drying (400 W) had the highest levels of phytochemical compounds with total phenolic, total flavonoid, Downloaded by [New York University] at 13:46 31 July 2015 2 proanthocyanidin, and saponin contents being 11.27 mg GAE, 19.88 mg RE, 3.98 mg CE, and 267.15 mg EE/gram of dried sample, respectively. Dried sample prepared using this method had comparable antioxidant capacity with other drying methods. In addition, this method had the shortest drying time (0.28 h), and consumed the least energy (0.28 kWh).Therefore, microwave drying method should be considered for drying P. trimera root for further investigation and utilization.

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“…The difference between infrared drying and convective heating drying methods is that material directly absorbed infrared energy rather than requiring the transfer of heat from air. Infrared radiation penetrates and collides with the material that is converted to sensible heat [18]. Drying processing was implemented at different temperatures under or not under vacuum.…”

Section: Impact On Extractable Solid Contentmentioning

confidence: 99%

Effect of Extraction Solvents and Drying Methods on the Physicochemical and Antioxidant Properties of Helicteres hirsuta Lour. Leaves

et al. 2015

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Helicteres hirsuta Lour. (H. hirsuta L.) is widely distributed in southeast Asian countries and has been used traditionally as a medicinal plant. However, optimal conditions for preparation of dried materials for further processing and suitable solvents for the extraction of bioactive compounds have not been investigated. The objective of this study was to evaluate the effects of different extraction solvents and different drying conditions on the physicochemical properties and antioxidant capacity of the H. hirsuta L. leaves. The results showed that both extraction solvents and drying conditions had a significant impact on physicochemical and antioxidant properties of H. hirsuta L. leaves. Among the five solvents investigated, water could extract the highest level of solid content and phenolic compounds, whereas methanol was more effective for obtaining flavonoids and saponins than other solvents. The leaves dried under either hot-air drying at 80 °C (HAD80), or vacuum drying at 50 °C (VD50) yielded the highest amount of total phenolic compounds OPEN ACCESSTechnologies 2015, 3 286 (7.77 and 8.33 mg GAE/g, respectively) and total flavonoid content (5.79 and 4.62 mg CE/g, respectively), and possessed the strongest antioxidant power, while leaves dried using infrared drying at 30 °C had the lowest levels of bioactive compounds. Phenolic compounds including flavonoids had a strong correlation with antioxidant capacity. Therefore, HAD80 and VD50 are recommended for the preparation of dried H. hirsuta L. leaves. Water and methanol are suggested solvents to be used for extraction of phenolic compounds and saponins from H. hirsuta L. leaves for the potential application in the nutraceutical and pharmaceutical industries.

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Infrared, Convective, and Sequential Infrared and Convective Drying of Wine Grape Pomace

Cited by 68 publications

References 40 publications

Drying and Shrinkage Kinetics of Solid Waste of Olive Oil Processing

Drying and Shrinkage Kinetics of Solid Waste of Olive Oil Processing

Phytochemical retention and antioxidant capacity of xao tam phan (Paramignya trimera) root as prepared by different drying methods

Effect of Extraction Solvents and Drying Methods on the Physicochemical and Antioxidant Properties of Helicteres hirsuta Lour. Leaves

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