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Potensi Kurkumin Sebagai Penunjuk pH Semulajadi untuk Pembangunan Sensor Optik pH

Rosmawani Mohammad, and Musa Ahmad, and Jamaluddin Mohd. Daud, (2007) Potensi Kurkumin Sebagai Penunjuk pH Semulajadi untuk Pembangunan Sensor Optik pH. Malaysian Journal of Analytical Sciences, 11 (2). pp. 351-360. ISSN 13942506

Full text not available from this repository.

Official URL: http://pkukmweb.ukm.my/~mjas/v11_n2/v11_n2b.html; http://pkukmweb.ukm.my/~mjas/v11_n2/rosmawani%20et%20al.pdf

Affiliations

Universiti Kebangsaan Malaysia, Pusat pengajian Sains Kimia & Teknologi Makanan

Abstract

The potential of curcumin reagent as a natural pH indicator for the development of an optical pH sensor was discussed in this study. Curcumin has been chosen because it has never been reported before for use in the development of an optical pH sensor. Curcumin is a colouring constituent of tumeric that giving yellow pigmentation. Curcumin showed clear colour changes i.e. yellow in acidic and reddish-brown in basic solutions. The colour change is fast i.e. within 5 seconds. Results from the study showed that a linear pH range for this reagent was observed at pH 8-12 (R2 = 0.9854). Curcumin has a good photostability with RSD value of 1.42% for a study period of 6 months. The RSD values of the reproducibility study were found to be 1.43% and 0.37% for pH 9 and pH 12, respectively. Characterisation of the immobilised curcumin reagent also showed promising results, hence a good potential for use as a sensing reagent for an optical pH sensor.

Potensi reagen kurkumin sebagai penunjuk pH semulajadi untuk pembangunan sensor optik pH dibincangkan dalam kajian ini.Reagen ini dipilih kerana ia belum pernah dilaporkan sebelum ini untuk digunakan sebagai bahan reagen bagi pembangunan sensor optik pH. Kurkumin merupakan bahan pewarna bagi kunyit yang memberikan pigmentasi kuning. Kurkumin memberikan perubahan warna yang jelas iaitu warna kuning dalam keadaan asid dan warna perang dalam keadaan bes. Perubahan warna yang berlaku adalah cepat iaitu lebih kurang 5 saat. Berdasarkan kajian larutan yang dijalankan, julat rangsangan linear pH bagi reagen kurkumin ialah antara pH 8-12 (R2 = 0.9854). Reagen kurkumin mempunyai kestabilanfoto yang baik dengan nilai RSD 1.42% untuk tempoh kajian selama 6 bulan. Nilai RSD kebolehulangan bagi pH 9 dan pH 12 adalah masing-masingnya sebanyak 1.43% dan 0.37%. Pencirian terhadap reagen kurkumin terpegun turut memberikan keputusan yang menggalakkan, seterusnya berpotensi untuk digunakan sebagai bahan reagen bagi pembangunan sensor optik pH.

Item Type:Journal
Additional Information:Financed by Postgraduate grant Universiti Kebangsaan Malaysia and an IRPA Top-Down project 09-03-03-0006.
Keywords:Curcumib agent, yellow colouring pigmentation of tumeric
Subjects:Q Science
ID Code:991

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