Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim

Lemongrass is a well-known plant in Malaysia due to its lemony aroma used for cooking. Citral, which consists of two isomers, neral and geranial is the compound responsible for the unique flavour of lemongrass. Due to susceptibility of citral to oxidation, encapsulation of lemongrass oleoresin was c...

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Main Author:	Abdul Halim, Nur Ain
Format:	Thesis
Language:	English
Published:	2014
Subjects:	Plant anatomy Botanical chemistry. Phytochemicals
Online Access:	http://ir.uitm.edu.my/id/eprint/14249/ http://ir.uitm.edu.my/id/eprint/14249/1/TM_NUR%20AIN%20ABDUL%20HALIM%20AS%2014_5.pdf

id	uitm-14249
recordtype	eprints
spelling	uitm-142492016-08-19T01:34:18Z http://ir.uitm.edu.my/id/eprint/14249/ Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim Abdul Halim, Nur Ain Plant anatomy Botanical chemistry. Phytochemicals Lemongrass is a well-known plant in Malaysia due to its lemony aroma used for cooking. Citral, which consists of two isomers, neral and geranial is the compound responsible for the unique flavour of lemongrass. Due to susceptibility of citral to oxidation, encapsulation of lemongrass oleoresin was carried out to increase stability of the oleoresin. Optimisation of lemongrass oleoresin extraction using Pressurised Liquid Extraction (PLE) was based on temperature, pressure and static time. The optimised PLE parameters obtained were temperature of 167.5°C, a pressure of 1203 psi and static time of 20 minutes. Sensory evaluation data revealed that the lemongrass extract obtained using standard PLE method (100°C, 1000 psi, 30 minutes) was significantly (p<0.05) more acceptable than the extract obtained from the optimised conditions. Phase solubility study concluded that P cyclodextrinlemongrass oleoresin inclusion complex was highly stable with stability constant (Kc) of 2091M'* and 1192 M‘* for neral and geranial; respectively. Lower Kc obtained for y-cyclodextrin indicates formation of unstable inclusion complex with Kc values of 59 M'' and 51 M'' for neral and geranial; respectively. Inclusion complex of cyclodextrins-lemongrass oleoresin was formed using kneading, co-precipitation and physical mixture methods. Further characterisation of the complex using Differential Scanning Calorimetry (DSC), Fourier Transmission Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) revealed that co-precipitation was able to form a new solid phase. However, based on kinetic modeling and percentage retention of neral and geranial upon storage, encapsulation of lemongrass oleoresin with cyclodextrins was unable to improve stability of compound neral and geranial upon storage for 217 days. 2014 Thesis NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/14249/1/TM_NUR%20AIN%20ABDUL%20HALIM%20AS%2014_5.pdf Abdul Halim, Nur Ain (2014) Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim. Masters thesis, Universiti Teknologi MARA.
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Teknologi MARA
building	UiTM Institutional Repository
collection	Online Access
language	English
topic	Plant anatomy Botanical chemistry. Phytochemicals
spellingShingle	Plant anatomy Botanical chemistry. Phytochemicals Abdul Halim, Nur Ain Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim
description	Lemongrass is a well-known plant in Malaysia due to its lemony aroma used for cooking. Citral, which consists of two isomers, neral and geranial is the compound responsible for the unique flavour of lemongrass. Due to susceptibility of citral to oxidation, encapsulation of lemongrass oleoresin was carried out to increase stability of the oleoresin. Optimisation of lemongrass oleoresin extraction using Pressurised Liquid Extraction (PLE) was based on temperature, pressure and static time. The optimised PLE parameters obtained were temperature of 167.5°C, a pressure of 1203 psi and static time of 20 minutes. Sensory evaluation data revealed that the lemongrass extract obtained using standard PLE method (100°C, 1000 psi, 30 minutes) was significantly (p<0.05) more acceptable than the extract obtained from the optimised conditions. Phase solubility study concluded that P cyclodextrinlemongrass oleoresin inclusion complex was highly stable with stability constant (Kc) of 2091M'* and 1192 M‘* for neral and geranial; respectively. Lower Kc obtained for y-cyclodextrin indicates formation of unstable inclusion complex with Kc values of 59 M'' and 51 M'' for neral and geranial; respectively. Inclusion complex of cyclodextrins-lemongrass oleoresin was formed using kneading, co-precipitation and physical mixture methods. Further characterisation of the complex using Differential Scanning Calorimetry (DSC), Fourier Transmission Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) revealed that co-precipitation was able to form a new solid phase. However, based on kinetic modeling and percentage retention of neral and geranial upon storage, encapsulation of lemongrass oleoresin with cyclodextrins was unable to improve stability of compound neral and geranial upon storage for 217 days.
format	Thesis
author	Abdul Halim, Nur Ain
author_facet	Abdul Halim, Nur Ain
author_sort	Abdul Halim, Nur Ain
title	Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim
title_short	Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim
title_full	Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim
title_fullStr	Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim
title_full_unstemmed	Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim
title_sort	extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / nur ain abdul halim
publishDate	2014
url	http://ir.uitm.edu.my/id/eprint/14249/ http://ir.uitm.edu.my/id/eprint/14249/1/TM_NUR%20AIN%20ABDUL%20HALIM%20AS%2014_5.pdf
first_indexed	2023-09-18T22:51:12Z
last_indexed	2023-09-18T22:51:12Z
_version_	1777417556205764608

Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim

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