Gek-Cheng Ngoh

University of Malaya (UM) - Department of Chemistry

Jalan Lembah Pantai

Kuala Lumpur, Wilayah Persekutuan 50603

Malaysia

SCHOLARLY PAPERS

19

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Scholarly Papers (19)

1.

Development of a Novel Inoculum Preparation Method for Solid-State Fermentation -- Cellophane Film Culture (CFC) Technique

Industrial Crops and Products, 43, 774-777.
Number of pages: 13 Posted: 19 Jan 2015
Teck Nam, Gek-Cheng Ngoh and Adeline Seak May Chua
The University of Auckland, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM)
Downloads 235 (127,684)

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Inoculum; solid-state fermentation; cellophane; fungus; rice husk

2.

A Brief Review on Anti Diabetic Plants: Global Distribution, Active Ingredients, Extraction Techniques and Acting Mechanisms

Pharmacognosy Reviews, 6(11), 22-28, 2012, DOI: 10.4103/0973-7847.95854
Number of pages: 7 Posted: 22 Dec 2014
Chung-Hung Chan, Gek-Cheng Ngoh and Rozita Yusoff
affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM) - Department of Chemistry
Downloads 225 (133,299)

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Active ingredient; Anti diabetic treatment; extraction technique; herbal plants extract, antioxidant activity

3.

Fungal Solid-State Fermentation and Various Methods of Enhancement in Cellulase Production

Biomass and Bioenergy, 67, 319-338.
Number of pages: 49 Posted: 19 Jan 2015
University of Malaya (UM), The University of Auckland, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM)
Downloads 131 (214,140)

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Cellulase, Solid state fermentation, White-rot fungi, Brown-rot fungi, Enzyme production, enhancement

4.

Modeling and Kinetics Study of Conventional and Assisted Batch Solvent Extraction

Chan, C.-H., Yusoff, R., & Ngoh, G.-C. (2014). Modeling and kinetics study of conventional and assisted batch solvent extraction. Chemical Engineering Research and Design, 92(6), 1169-1186. doi: 10.1016/j.cherd.2013.10.001
Number of pages: 34 Posted: 18 Dec 2014 Last Revised: 22 Feb 2017
Chung-Hung Chan, Rozita Yusoff and Gek-Cheng Ngoh
affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM) - Department of Chemistry
Downloads 76 (308,713)

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Microwave-assisted extraction; Active ingredients; Extraction yield; Instrumentation; Optimum operating condition; Optimization; Response surface methodology; Bioactive compound; Solid liquid extraction

5.

Efficiency of Ionic Liquid in the Dissolution of Rice Husk

BioResources, 6(4), 4790-4800.
Number of pages: 11 Posted: 19 Jan 2015
The University of Auckland, University of Malaya (UM), University of Malaya (UM), University of Malaya (UM) - Department of Chemistry, University of Malaya (UM) and Pukyong National University
Downloads 69 (325,763)

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Ionic liquid; Dissolution; Regenerated cellulose; Rice husk; FT-IR; Energy requirement

6.

A Quantitative Method for Fungal Ligninolytic Enzyme Screening Studies

Asia-Pacific Journal of Chemical Engineering, 6, 589-595.
Number of pages: 18 Posted: 19 Jan 2015
Teck Nam, Gek-Cheng Ngoh and Adeline Seak May Chua
The University of Auckland, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM)
Downloads 67 (330,994)

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Quantitative method; Ligninolytic enzymes; Screening; Guaiacol oxidation; Remazol Brilliant Blue-R (RBB-R) decolourization; Lignocellulose.

7.

Microwave-Assisted Extractions of Active Ingredients from Plants

Journal of Chromatography A, 1218(37), 6213-6225, 2011, DOI: 10.1016/j.chroma.2011.07.040
Number of pages: 29 Posted: 23 Dec 2014
affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemistry, University of Malaya (UM) - Department of Chemistry and Multimedia University (MMU)
Downloads 60 (350,108)

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microwave-assisted extraction, active ingredients, extraction yield, instrumentation, optimum operating condition

8.

Optimization of Microwave-Assisted Extraction Based on Absorbed Microwave Power and Energy

Chan, C.-H., Yusoff, R., & Ngoh, G.-C. (2014). Optimization of microwave-assisted extraction based on absorbed microwave power and energy. Chemical Engineering Science, 111, 41-47. doi: 10.1016/j.ces.2014.02.011
Number of pages: 19 Posted: 18 Dec 2014
Chung-Hung Chan, Rozita Yusoff and Gek-Cheng Ngoh
affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM) - Department of Chemistry
Downloads 29 (463,231)

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Microwave-assisted extraction; Active ingredients; Extraction yield; Instrumentation; Optimum operating condition; Optimization; Response surface methodology; Bioactive compound; Solid liquid extraction

9.

Assessment of Cellulosic Biomass Saccharification by Molten Bronsted Acidic 1-Ethyl-3-Methylimidazolium Hydrogen Sulphate ([EMIM][HSO4]) Via Kinetic Studies

Ang T.N., Chan C.-H., Ngoh G.C., Lee K.M., Yoon L.W. & Chua A.S.M. (2016). Assessment of cellulosic biomass saccharification by molten Bronsted acidic 1-ethyl-3-methylimidazolium hydrogen sulphate ([EMIM][HSO4]) via kinetic studies. BioResources. 11(1), 1349-1358.
Number of pages: 10 Posted: 23 Feb 2017
The University of Auckland, affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemistry, University of Malaya (UM), University of Malaya (UM) and University of Malaya (UM)
Downloads 24 (489,248)

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Ionic liquid; Simultaneous dissolution and saccharification; Kinetic modeling; Sago hampas; Sugarcane bagasse; Rice husk

10.

Comparison Study of Different Ionic Liquid Pretreatments in Maximizing Total Reducing Sugars Recovery

BioResources, 9 (1), 1552-1564.
Number of pages: 13 Posted: 19 Jan 2015
University of Malaya (UM), University of Malaya (UM) - Department of Chemistry, University of Malaya (UM), University of Malaya (UM), The University of Auckland and Pukyong National University
Downloads 23 (494,678)

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Sago waste; Ionic liquid pretreatment; Solid acid saccharification; Enzymatic saccharification; Reducing sugars

11.

Extraction of Bioactives from Orthosiphon Stamineus Using Microwave and Ultrasound-Assisted Techniques: Process Optimization and Scale Up

Food Chemistry, Vol. 221, p. 1382-1387, 2017
Number of pages: 18 Posted: 14 Mar 2017
affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemical Engineering, University of Malaya (UM) - Department of Chemistry, University of Malaya (UM) - Department of Chemistry and UCSI University
Downloads 21 (506,032)

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Microwave Extraction, Ultrasonic Extraction, Bioactive Compounds, Orthosiphon Stamineus, Scale Up

12.

Comparative Study of Various Pretreatment Reagents on Rice Husk and Structural Changes Assessment of the Optimised Pretreated Rice Husk

Bioresource Technology, 135: 116-119
Number of pages: 21 Posted: 19 Jan 2015
Teck Nam, Gek-Cheng Ngoh and Adeline Seak May Chua
The University of Auckland, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM)
Downloads 19 (517,467)

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Response surface methodology; optimization; rice hulls; pretreatment; structural assessment.

13.

Assessment of Various Pretreatment and Extraction Methods for the Extraction of Bioactive Compounds from Orthosiphon Stamineus Leaf via Microstructures Analysis

International Journal of Food Engineering, Vol. 12(7), p. 711-717, 2016
Number of pages: 14 Posted: 14 Mar 2017
University of Malaya (UM) - Department of Chemical Engineering, University of Malaya (UM) - Department of Chemical Engineering, The University of Auckland, affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM) - Department of Chemistry
Downloads 17 (528,936)

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Bioactive Compounds, Microstructure, Extraction Systems, Ultrasonic-Assisted Extraction, Microwave-Assisted Extraction

14.

A First-Principles Model for Plant Cell Rupture in Microwave-Assisted Extraction of Bioactive Compounds

Journal of Food Engineering, Vol. 188, p. 98-107, 2016
Number of pages: 26 Posted: 14 Mar 2017
Chung-Hung Chan, Hak Yeoh, Rozita Yusoff and Gek-Cheng Ngoh
affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemical Engineering, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM) - Department of Chemistry
Downloads 17 (528,936)

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Theoretical Model, Microwave Heating, Cell Rupture, Extraction Time, Bioactive Compounds

15.

Assessment of Scale-Up Parameter of Microwave-Assisted Extraction via the Extraction of Flavonoids from Cocoa Leaves

Chemical Engineering & Technology, Vol. 38(3), p. 489-496, 2015
Number of pages: 20 Posted: 14 Mar 2017
Chung-Hung Chan, Rozita Yusoff and Gek-Cheng Ngoh
affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM) - Department of Chemistry
Downloads 17 (528,936)

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Absorbed Power Density (APD), Optimum Extraction Time, Kinetic Modeling, Film Theory

16.

Elucidation of the Effect of Ionic Liquid Pretreatment on Rice Husk via Structural Analyses

Biotechnology for Biofuels, 5, 67.
Number of pages: 10 Posted: 19 Jan 2015
The University of Auckland, University of Malaya (UM) - Department of Chemistry, University of Malaya (UM) and Pukyong National University
Downloads 11 (564,075)

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Rice husk, Ionic liquid, Dissolution, Pretreatment, Regenerated cellulose, Structural analysis

17.

A Generalized Energy-Based Kinetic Model for Microwave-Assisted Extraction of Bioactive Compounds from Plants

Separation and Purification Technology, Vol. 143, p. 152-160, 2015
Number of pages: 22 Posted: 14 Mar 2017
affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemical Engineering, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM) - Department of Chemistry
Downloads 10 (570,175)

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Absorbed Power Density (APD), Absorbed Energy Density (AED), Generalized Model, Heating Modes, Normalized Extraction Yield

18.

Regression Analysis on Ionic Liquid Pretreatment of Sugarcane Bagasse and Assessment of Structural Changes

Biomass and Bioenergy, 36, 160-169.
Number of pages: 21 Posted: 19 Jan 2015
University of Malaya (UM), The University of Auckland, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM)
Downloads 10 (570,175)

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Pretreatment, Ionic liquid, Sugarcane bagasse, Optimization, Central Composite Design, Reducing sugar

19.

Modeling and Prediction of Extraction Profile for Microwave-Assisted Extraction Based on Absorbed Microwave Energy

Food Chemistry, 140(1-2), 147-153, 2013, DOI: 10.1016/j.foodchem.2013.02.057
Number of pages: 16 Posted: 22 Dec 2014
Chung-Hung Chan, Rozita Yusoff and Gek-Cheng Ngoh
affiliation not provided to SSRN, University of Malaya (UM) - Department of Chemistry and University of Malaya (UM) - Department of Chemistry
Downloads 9 (576,177)

Abstract:

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Microwave-assisted extraction; Active ingredients; Extraction yield; Instrumentation; Optimum operating condition; Optimization; Response surface methodology; Bioactive compound; Solid liquid extraction