“…4 As seen in Fig. This finding is in agreement with that reported by Kim et al [24] who studied the extraction of mangiferin from Mahkota Dewa fruits by SWE, whereas Alara et al [30] reported that the optimum mangiferin yield was obtained at 105°C and 6 h extraction time. Hence, the temperature of 100°C with a mangiferin yield of 21.7 mg g -1 and antioxidant activity of 88.66 ± 0.07 % can be suggested as the optimum extraction temperature.…”
Section: Effect Of Temperature On Mangiferin Yield and Antioxidant Acsupporting
Subcritical water extraction and molecular dynamics simulation were performed to investigate mangiferin and antioxidant extraction from Mahkota Dewa fruits at different operating temperatures. The mangiferin yield and antioxidant activity were analyzed using high-performance liquid chromatography and 2-diphenyl-1-picrylhydrazyl assay method, respectively. The diffusivity and intermolecular interactions were determined by mean squared displacement (MSD) and radial distribution function (RDF) analysis, respectively. The temperature exerts a momentous effect on mangiferin yield and antioxidant activity of the extract. The MSD result showed an increment in diffusivity coefficient of mangiferin with temperature. The RDF analysis revealed hydrogen bonding formations between mangiferin and water through O H2O..H MR4(OH1) interaction that plays a role in the extraction process.
“…4 As seen in Fig. This finding is in agreement with that reported by Kim et al [24] who studied the extraction of mangiferin from Mahkota Dewa fruits by SWE, whereas Alara et al [30] reported that the optimum mangiferin yield was obtained at 105°C and 6 h extraction time. Hence, the temperature of 100°C with a mangiferin yield of 21.7 mg g -1 and antioxidant activity of 88.66 ± 0.07 % can be suggested as the optimum extraction temperature.…”
Section: Effect Of Temperature On Mangiferin Yield and Antioxidant Acsupporting
Subcritical water extraction and molecular dynamics simulation were performed to investigate mangiferin and antioxidant extraction from Mahkota Dewa fruits at different operating temperatures. The mangiferin yield and antioxidant activity were analyzed using high-performance liquid chromatography and 2-diphenyl-1-picrylhydrazyl assay method, respectively. The diffusivity and intermolecular interactions were determined by mean squared displacement (MSD) and radial distribution function (RDF) analysis, respectively. The temperature exerts a momentous effect on mangiferin yield and antioxidant activity of the extract. The MSD result showed an increment in diffusivity coefficient of mangiferin with temperature. The RDF analysis revealed hydrogen bonding formations between mangiferin and water through O H2O..H MR4(OH1) interaction that plays a role in the extraction process.
“…x 1 irradiation time (min), x 2 microwave power level (W), x 3 feed particle size (mm), x 4 liquid-to-solvent ratio (mL/g), I inhibition (%), A antioxidant activity (μg/mL) *Optimum trial confidence level (Alara et al 2017). The result indicated a higher percentage inhibition and close resemblance with the result obtained from other studies (Ilhami 2005;Cao et al 2009;Singh et al 2013).…”
The tropical white peppercorns are common commodity crops which have been traditionally used for the treatment of many free radical-related diseases. These medicinal properties are due to the presence of natural antioxidants. This study investigated the combination of microwave extraction parameters for the recovery of natural antioxidants from the white pepper matrix. Microwave-assisted technique was used for the extraction of bioactive oleoresin from white pepper. Taguchi experimental design was employed to investigate the combination of independent extraction parameters for optimal recovery of natural antioxidants. The feed backpropagation artificial neural network model was thereafter applied to optimally predict the result for the different combination of operating parameters. This was achieved by evaluating different algorithms, transfer functions, and neurons. The result obtained from the orthogonal parametric study gave an optimal antioxidant activity of 91.02% at irradiation time of 120 min, microwave power level of 350 W, particle size of 0.300 mm, and liquid-to-solid ratio of 6 mL/g. The gradient descent (GD) algorithm, tansigmoid transfer function, and 4-x-3 topology were used to model the experimental data. A better prediction was then obtained with an overall coefficient (R) and mean square error (MSE) of 0.9595 and 1.4381, respectively. In this study, the feedforward backpropagation neural network was successfully applied to optimally evaluate the complex relationship between the input extraction parameters and the response.
“…The decreasing order of contribution of the variables shows microwave power as the largest contributor for optimum extraction, while the extraction time has the least contribution to the process. Therefore good quality characteristics, a higher microwave power, lower extraction time and moderate heat are required for optimal extraction yield ( Alara et al., 2017 ). Figure 1 Mean effect analysis of SNR showing the factors' significant contribution.…”
The increase in wastes generated from jackfruit seeds has been largely under-utilized in Malaysia. Due to the high nutritional and medicinal content embedded in the cellulosic structure of jackfruit wastes, a need then arises for their physicochemical elucidations. In this study, the extraction of
Artocarpus heterophyllus
seed was carefully investigated using Taguchi orthogonal optimization design. Complete functional group characteristics and chemical profile of the
A. heterophyllus
seed extracts were obtained using different physicochemical characterization. The optimal conditions of the microwave extraction parameters were determined at 5 min of irradiation time, 450 W of power and 50 °C of temperature. Under this condition, the optimal yield of 17.34 (mg/g) % was achieved at an SNR ratio of 24.78. The mass spectrometry analysis tentatively identified a total of 90 and 148 secondary metabolites at positive and negative ESI modes, respectively. The chemical profile obtained provided a baseline reference for further investigation on the food and medicinal bioactive from
Artocarpus heterophyllus
seed oleoresins. The FT-infrared emission spectrum shows the presence of some specific carbohydrates and amide protein functional groups directly linked to C–O (1008 cm
−1
) the carbonyl (C=O) groups, respectively. Moreover, the morphological characteristics of the jackfruit raw and crude extracts conspicuously revealed large-sized globules which suggest the carbohydrates and protein contents. The result of this study indicates that the use of microwave extraction technology produced high-quality extracts with lower degradation of the thermal labile constituents. This will assist in determining the suitable conditions necessary for the total recovery of medicinal and nutritional constituents and conversion of agricultural waste products into useful products.
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