Author/Authors :
ABD KARIM, NURUL HUDA UKM - Fakulti Sains Teknologi - Pusat Pengajian Sains Kimia dan Teknologi Makanan, Malaysia , AHMAD, MUSA Universiti Kebangsaan Malaysia - Fakulti Sains dan Teknologi - Pusat Pengajian Sains Kimia dan Teknologi Makanan, Malaysia , OSMAN, MOHAMMAD UKM - Fakulti Sains dan Teknologi - Pusat Pengajian Sains Sekitaran, Malaysia , HERMAN UKM - Fakulti Sains dan Teknologi - Pusat Pengajian Sains Sekitaran, Malaysia , MOKHTAR, AHMAD MAHIR Universiti Sains Islam Malaysia (USIM) - Fakulti Sains dan Teknologi, Malaysia
Abstract :
This research assessed the potential of natural colour extract of Hibiscus Sabdariffa L. (roselle) as sensing material.The pH sensor was developed based on the use of natural reddish colour in roselle’s calyx, delphinidin-3-sambubioside immobilised in a glass fibre filter paper. In free solution, roselle extract was characterised by using UV-visible spectrophotometer to study the effect of pH, extract concentration, response time, repeatability and photostability. The study showed that natural colour extract can be used as sensing material for the development of an optical pH sensor
Keywords :
pH sensor , roselle extract , delphinidin , 3 , sambubioside
