A three-stage microwave-assisted drying model based on the dielectric properties of laminar materials: Theoretical development and validation

2002 ◽  
Vol 32 (6) ◽  
pp. 465-469 ◽  
Author(s):  
J. Monzó-Cabrera ◽  
J. M. Catalá-Civera ◽  
A. Díaz-Morcillo ◽  
D. Sánchez-Hernández ◽  
P. J. Plaza-González ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Theoretical Development ◽  
Microwave Assisted ◽  
Model Based ◽  
Drying Model ◽  
Development And Validation

scholarly journals Microwave-Assisted Extraction of Phenolics from Hibiscus sabdariffa Flowers: Method Development and Validation

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 51
Author(s):  
Rohmah Nur Fathimah ◽  
Widiastuti Setyaningsih ◽  
Ceferino Carrera ◽  
Miguel Palma
Keyword(s):  
Phenolic Compounds ◽  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Solvent Composition ◽  
Positive Contribution ◽  
Hibiscus Sabdariffa ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Development And Validation

Phenolics are bioactive compounds already reported in Hibiscus sabdariffa (roselle). The present study reports the development and validation of the analytical microwave-assisted extraction (MAE) method for the determination of phenolic compounds in roselle flowers to establish their positive contribution to human health. Prior to the optimization, a study for identifying phenolic compounds revealed that chlorogenic acid, protocatechuic acid, caffeic acid, and rutin were presented in Roselle. Three factors affecting MAE, viz. temperature, solvent composition, and sample to solvent ratio, were optimized employing a Box-Behnken Design (BBD) in conjunction with response surface methodology (RSM). The maximum extraction recovery was achieved using the extraction temperature of 68 °C, solvent composition of 59% MeOH in water, and 20:1 solvent to sample ratio. The kinetics experiment confirmed full recoveries (92–119%) at 15 min. Subsequently, method validation showed a satisfactory result, including low detection limits from 0.219 mg L−1 (caffeic acid) to 0.374 mg L−1 (chlorogenic acid). Both precisions and accuracy met the acceptances by AOAC. Finally, the method was successfully applied to quantify phenolics in the two most common varieties of Roselle. Chlorogenic acid was found as the main phenolic compound in both varieties

Theoretical development and validation of a fatigue model for ship routing

2012 ◽  
Vol 7 (4) ◽  
pp. 399-415 ◽  
Author(s):  
Wengang Mao ◽  
Jonas W. Ringsberg ◽  
Igor Rychlik ◽  
Zhiyuan Li
Keyword(s):  
Theoretical Development ◽  
Ship Routing ◽  
Fatigue Model ◽  
Development And Validation

Development and Validation of the New EPA Microwave-Assisted Leach Method 3051A

1998 ◽  
Vol 32 (22) ◽  
pp. 3628-3632 ◽  
Author(s):  
Dirk D. Link ◽  
Peter J. Walter ◽  
H. M. Kingston
Keyword(s):  
Microwave Assisted ◽  
Development And Validation

Dielectric Relaxation Process and Microwave Heating Mechanism in ε-Caprolactone as a Function of Frequency and Temperature

2014 ◽  
Vol 931-932 ◽  
pp. 205-209 ◽  
Author(s):  
Mohd Johari Kamaruddin ◽  
Anwar Johari ◽  
Ramli Mat ◽  
Tuan Amran Tuan Abdullah ◽  
Siti Hamidah Mohd Setapar ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Heating ◽  
Processing System ◽  
Debye Model ◽  
Microwave Energy ◽  
Dielectric Relaxation Process ◽  
Microwave Assisted ◽  
Heating Mechanism ◽  
Wide Range ◽  
Properties Of Materials

Dielectric properties of materials play a significant role in design of microwave assisted processing system. This paper is focused on the dielectric properties of ε-caprolactone (ε-cap) which is the monomer for the biodegradable polymer, Poly (ε-caprolactone) (PCL). The dielectric properties of ε-cap were measured across a wide range of frequencies (0.1 GHz5.0 GHz) and temperatures (20-150oC). Then the measured dielectric properties data was modelled using Debye model in order to relate quantitatively the dielectric properties to microwave heating mechanisms. The analysis carried out gives a clear picture of interaction of ε-cap with microwave energy and its heating mechanism in microwave assisted polymerisation process. This study concluded that microwave heating mechanism of the ε-cap in the measured range may be dominated by the dipole reorientation.

Dielectric Properties of Beverages (Tamarind and Green) Relevant to Microwave-Assisted Pasteurization

2018 ◽  
Vol 83 (9) ◽  
pp. 2317-2323 ◽  
Author(s):  
Arnold David González-Monroy ◽  
Tejinder Kaur Kataria ◽  
José Luis Olvera-Cervantes ◽  
Alonso Corona-Chávez ◽  
César Ozuna ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Assisted
Sign in / Sign up

Export Citation Format

Share Document