Effect of Drying Methods on Metabolites Composition of Misai Kucing (Orthosiphon stamineus) Leaves

Abdullah, Sriyana; Shaari, Abdul Razak; Azimi, Adli

doi:10.1016/j.apcbee.2012.06.032

Cited by 34 publications

(17 citation statements)

References 10 publications

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“…This observation is same as the finding from Ahmadi Chenarbon et al [25] who does on hot air drying of herbal leaves. The findings also showed that drying time became shorter as the temperature of dehumidified-air increased and it is common finding observed by other researchers [26,27].This is because an extra energy is provided to the drying process that increases the moisture transfer, especially to the bound water transferring. Table 2.…”

Section: Effect Of Drying Conditions On Drying Timesupporting

confidence: 72%

Green Drying: Continuous Dehumidified-Air Dryer

Woo¹,

Yeoh²,

Go³

et al. 2014

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Non-thermal drying, such as dehumidified-air drying has been introduced to overcome the drawbacks of conventional thermal and direct contact adsorption drying. However, existing approach of this method is not so user friendly as the dehumidifiedair cannot be supplied continuously due to the depletion of desiccants. The desiccants also need a high temperature for the regeneration. Therefore, a continuous dehumidified-air dryer is focused in this study. The dehumidified-air was produced alternately by adsorbents, which located in two chambers. The adsorbents were then regenerated at ambient temperature by pressure-swing concepts. This continuous dehumidified-dryer was commissioned by drying A. paniculata, at the dehumidified-air 10 to 30 L/min and 30 to 50C. The sample was dried at less than 10 hours, and about 75 % of andrographolide had been maintained. The Page model was well describing the drying behaviour, and the diffusivity coefficient was determined as 1.88 x 10-13 m 2 /s.

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Section: Effect Of Drying Conditions On Drying Timesupporting

confidence: 72%

Green Drying: Continuous Dehumidified-Air Dryer

Woo¹,

Yeoh²,

Go³

et al. 2014

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“…The thermal treatment may have promoted an easier release of cell constituents from plant cells [27], as heat exerts modifications to plant tissue microstructure, thereby reducing cell integrity [28] and allowing for the easy exit of phenolic compounds from plant cells. Dried leaves have the tendency to exhibit increased bioactivity, as reported in past studies [29,30]. Moisture loss in leaves during drying, an abiotic stress, may have triggered the production and accumulation of phenolic compounds, thereby increasing the overall antioxidant activity [31].…”

Section: Antioxidant Activity and Total Phenolic Content Analysismentioning

confidence: 76%

Drying of Phyla nodiflora Leaves: Antioxidant Activity, Volatile and Phytosterol Content, Energy Consumption, and Quality Studies

et al. 2019

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Drying is an important process in the preservation of antioxidants in medicinal plants. In this study, leaves of Phyla nodiflora, or commonly known as frog fruit, were dried using convective drying (CD) at 40, 50, and 60 °C; vacuum-microwave drying (VMD) at 6, 9, and 12 W/g; and convective pre-drying followed by vacuum-microwave finish drying (CPD–VMFD) at 50 °C and 9 W/g. Drying kinetics of P. nodiflora leaves was modelled, and the influences of drying methods on the antioxidant activity, total phenolic content, volatile and phytosterol contents, energy consumption, water activity, and color properties were determined. Results showed that drying kinetics was best described by modified Page model. VMD achieved highest drying rate, whereas VMFD considerably reduced the drying time of CD from 240 min to 105 min. CPD–VMFD was the best option to dry P. nodiflora in terms of retaining volatiles and phytosterols, with lower energy consumption than CD. Meanwhile, VMD at 6 W/g produced samples with the highest antioxidant activity with 2,2′-Azinobis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) and ferric reducing antioxidant power (FRAP) value of 11.00 and 15.99 µM Trolox/100 g dw, respectively.

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“…Shorter period of extraction time was obtained using this method. However, effect of drying on Orthosiphon stamineus showed no significant effect on the antioxidant activity but the bioactive phytochemicals; such as sinensetin and rosmarinic acid content were affected by the ovenand sunlight-drying, suggesting the sensitivity of the compounds to temperature [10].…”

Section: Pre-extraction Preparation Of Plant Samplesmentioning

confidence: 89%