Sensors 2003, 3(10), 458-471; doi:10.3390/s31000458
Article

Chemometric Classification of Herb – Orthosiphon stamineus According to Its Geographical Origin Using Virtual Chemical Sensor Based Upon Fast GC

1 School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia 2 School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia 3 School of Distance Education, Universiti Sains Malaysia, 11800 Penang, Malaysia
* Author to whom correspondence should be addressed.
Received: 5 June 2003; Accepted: 28 August 2003 / Published: 31 October 2003
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Abstract: An analytical method using Electronic Nose (E-nose) instrument for analysis of volatile organic compound from Orthosiphon stamineus raw samples have been developed. This instrument is a new chemical sensor based on Fast Gas Chromatography and Surface Acoustics Wave (SAW) detector. Chromatographic fingerprint obtained from the headspace analysis of O. stamineus samples were used as a guideline for optimum selection of an array of sensor. Qualitative analysis was carried out based on the responses of each sensor array in order to distinguish the geographical origin of the cultivated sample. The results of the analysis showed variances of volatile chemical compound of the samples even though it is from the same species. However, similarities of main components from all five samples were observed. Usage of pattern recognition chemometric approaches such as Principal Component Analysis (PCA), Linear Discriminant Analysis (LDA) and Cluster Analysis (CA) for processing instrumental data provided good classification of O. stamineus samples according to its geographical origin.
Keywords: Electronic Nose; Orthosiphon stamineus; Fast Gas Chromatography; Chemometric; Virtual chemical sensor; Pattern recognition

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MDPI and ACS Style

Sim, C.O.; Ahmad, M.N.; Ismail, Z.; Othman, A.R.; Noor, N.A.M.; Zaihidee, E.M. Chemometric Classification of Herb – Orthosiphon stamineus According to Its Geographical Origin Using Virtual Chemical Sensor Based Upon Fast GC. Sensors 2003, 3, 458-471.

AMA Style

Sim CO, Ahmad MN, Ismail Z, Othman AR, Noor NAM, Zaihidee EM. Chemometric Classification of Herb – Orthosiphon stamineus According to Its Geographical Origin Using Virtual Chemical Sensor Based Upon Fast GC. Sensors. 2003; 3(10):458-471.

Chicago/Turabian Style

Sim, Chew O.; Ahmad, Mohd N.; Ismail, Zhari; Othman, Abdul R.; Noor, Nor A.M.; Zaihidee, Ezrinda M. 2003. "Chemometric Classification of Herb – Orthosiphon stamineus According to Its Geographical Origin Using Virtual Chemical Sensor Based Upon Fast GC." Sensors 3, no. 10: 458-471.

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