Effect of fixed bed drying on the retention of phenolic compounds, anthocyanins and antioxidant activity of roselle (Hibiscus sabdariffa L.)

Leyva-Daniel, Diana E.; Barragán-Huerta, Blanca E.; Sosa, Irasema Anaya; Mendoza, M.G. Vizcarra

doi:10.1016/j.indcrop.2012.03.015

Cited by 29 publications

(14 citation statements)

References 25 publications

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“…Some reports have explained the influence of drying methods on roselle calyxes, wherein the effect of temperature on spray drying of roselle calyx extracts and the retention of monomeric anthocyanins, phenolic compounds, polymeric colour and antioxidant activity were observed upon performing dehydration using fixed bed dryer equipment. 11,12 In a recent study the bioactive compound retention potential of aqueous extracts of roselle calyxes and its usage in a dairy beverage product were demonstrated. 10…”

Section: Discussionmentioning

confidence: 99%

Effect of different drying methods on chlorophyll, ascorbic acid and antioxidant compounds retention of leaves of Hibiscus sabdariffa L.

et al. 2014

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Section: Discussionmentioning

confidence: 99%

Effect of different drying methods on chlorophyll, ascorbic acid and antioxidant compounds retention of leaves of Hibiscus sabdariffa L.

et al. 2014

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“…The stability of bioactive compounds in drying is influenced by their thermal sensitivity and susceptibility to oxygen degradation [83]. Moreover, enzymatic and non-enzymatic processes, such as caramelization and chemical oxidation of phenols [84], may lead to significant changes in the composition of phytochemicals [85].…”

Section: Bioactive Composition and Antioxidant Capacitymentioning

confidence: 99%

Drying Technologies: Vehicle to High-Quality Herbs

2015

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Herbs are usually marketed as dry due to a consumer demand beyond their seasonality; dehydration leads to a stable, easily moveable product that is available throughout the year. The process of drying, though, leads to modifications in the appearance, composition and quality of the raw material. The extent of these alterations depends on the applied drying methodology and its parameters, rendering the optimization of this process imperative. Numerous studies examining the effect of drying on the main characteristics of herbs have been published in recent years, and this review aims at organizing the available information of the studied herbs, drying methods and measured parameters in a comprehensive manner. Primarily, since aroma is the main characteristic of herbs and the principal aim for the end product is to retain the raw material's character, this review will focus on the most widely studied effect of drying, which is the essential oil yield and composition. Secondly, results from various studies on the influence of drying on biochemical compounds, organoleptic properties of dried herbs are also presented. The most common approach to the study of drying kinetics is also presented. Finally, novel technologies targeting to minimize the magnitude of changes from the raw material are described.

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“…Lin et al (2011) found that vacuum freeze drying (VFD) was the best drying method for preserving caffeic acid derivatives and total phenolics in the fresh flowers, leaves, stems and roots of Echinacea purpurea . Drying conditions also had the impact on total phenolic content and antioxidant activity of roselle (Hibiscus sabdariffa L.) (Daniel et al 2012). Microwave drying was shown to retain phenolic content and was able to enhance antioxidant activity of methanol extact of Salvia officinails (Hamrouni-Sellami et al 2012).…”

Section: Antioxidative Activitiesmentioning

confidence: 99%

Antioxidant activities of lead (Leucaena leucocephala) seed as affected by extraction solvent, prior dechlorophyllisation and drying methods

et al. 2012

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Extracts of brown lead (Leucaena leucocephala) seed prepared using different extraction solvents were determined for antioxidative activities using different assays. The highest yield (3.4-4.0%) was obtained when water was used as an extraction solvent, compared with all ethanolic extracts used (1.2-2.0 %) (P<0.05). Much lower chlorophyll content was found in the water extract. When hot water was used, the resulting extract contained lower total phenolic and mimosine contents (P<0.05). In general, 60-80 % ethanolic extracts had higher 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging activities, ferric reducing antioxidant power (FRAP) and metal chelating activity than water extracts (P<0.05). When brown lead seed was dechlorophyllised prior to extraction, the water extract had slightly increased yield with lower chlorophyll content. Nevertheless, prior chlorophyll removal resulted in the increase in antioxidative activities but lower total phenolic and mimosine contents (P<0.05). Generally, phenolic compounds and mimosine were more released when water was used as the extraction solvent, while the lower amount of chlorophyll was extracted. Oven-drying exhibited the negative effect on antioxidative activities and mimosine content. The higher antioxidative activities with concomitant higher total phenolic and mimosine contents were found in water extract dried by freeze drying. Thus, extraction solvent, dechlorophyllisation and drying methods directly influenced the yield and antioxidative activity of lead seed extract.

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Effect of fixed bed drying on the retention of phenolic compounds, anthocyanins and antioxidant activity of roselle (Hibiscus sabdariffa L.)

Cited by 29 publications

References 25 publications

Effect of different drying methods on chlorophyll, ascorbic acid and antioxidant compounds retention of leaves of Hibiscus sabdariffa L.

Effect of different drying methods on chlorophyll, ascorbic acid and antioxidant compounds retention of leaves of Hibiscus sabdariffa L.

Drying Technologies: Vehicle to High-Quality Herbs

Antioxidant activities of lead (Leucaena leucocephala) seed as affected by extraction solvent, prior dechlorophyllisation and drying methods

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