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Vol. 28, Special Issue, April-May 2018, pp. 13-18




Polymer-Coated Piezoelectric Quartz Crystal Sensors for the Authentication of Virgin Coconut Oil

1, 2 Emelda A. ONGO, 2 Dharmatov Rahula B. ALBANO and 2 Fortunato B. SEVILLA III

1 Industrial Technology Development Institute, Bicutan, Taguig
2 University of Santo Tomas, Graduate School, Espaňa Blvd. City of Manila, Philippines
1 Tel.: +632 8372071, fax: +632 8372071

1 E-mail: eme_ongo@yahoo.com


Received: 28 March 2018 /Accepted: 28 May 2018 /Published: 31 May 2018

Digital Sensors and Sensor Sysstems


Abstract: The authentication of virgin coconut oil is important in view of its increasing popularity and great potential in the international market. In this study, a novel approach that could elucidate the distinct quality characteristics of virgin coconut oil was developed. An electronic nose based on polymer coated piezoelectric quartz crystal was assembled to discriminate different quality of coconut oils such as virgin coconut oil (VCO), flavored VCO, rancid VCO and refined, bleached and deodorized (RDB) coconut oil. It consisted of four polymeric sensors, an oscillator and a digital frequency counter. The sensors gave a stable response (response time = 5 to 8 minutes) and good reproducibility (r.s.d. = 6.48, 3.83, 6.45, 7.52; n=7) and repeatability (n=3). A unique quality profile of authentic VCO was observed against flavored and rancid VCO and RBD coconut oil using radar plot. The image formed is a chemical signature of an odor for a well-defined quality of VCO. The inherent structure of data was also analyzed using Principal Component Analysis (PCA). This technique decides which among all possible projections is the best for representing the clusters of data. The results have converged in suggesting that even two sensors are appropriate in distinguishing patterns or relationships in variables.


Keywords: Piezoelectric quartz sensors, Virgin coconut oil, Authentication, Principal component analysis.


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