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
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Online Access:https://ir.uitm.edu.my/id/eprint/14249/1/TM_NUR%20AIN%20ABDUL%20HALIM%20AS%2014_5.pdf
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spelling my-uitm-ir.142492022-04-20T07:05:52Z Extraction of lemongrass (cymbopogon citratus) oleoresin, characterisation and shelf life of cyclodextrinlemongrass oleoresin inclusion complex / Nur Ain Abdul Halim 2014-05 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. 2014-05 Thesis https://ir.uitm.edu.my/id/eprint/14249/ https://ir.uitm.edu.my/id/eprint/14249/1/TM_NUR%20AIN%20ABDUL%20HALIM%20AS%2014_5.pdf text en public mphil masters Universiti Teknologi MARA Faculty of Applied Sciences Abdul Haiyee, Zaibunnisa (Dr.) Mohamed Som, Halimahton Zahrah (Associate Professor Dr.)
institution Universiti Teknologi MARA
collection UiTM Institutional Repository
language English
advisor Abdul Haiyee, Zaibunnisa (Dr.)
Mohamed Som, Halimahton Zahrah (Associate Professor Dr.)
topic Plant anatomy
Plant anatomy
spellingShingle Plant anatomy
Plant anatomy
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
qualification_name Master of Philosophy (M.Phil.)
qualification_level Master's degree
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
granting_institution Universiti Teknologi MARA
granting_department Faculty of Applied Sciences
publishDate 2014
url https://ir.uitm.edu.my/id/eprint/14249/1/TM_NUR%20AIN%20ABDUL%20HALIM%20AS%2014_5.pdf
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