Prototipe Sensor Rasa Portable Berbasis Campuran Lipid Dioctyl Phosphate Dan Trioctyl Methyl Ammonium Chloride Dengan Perbandingan Massa 9:1
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Abstract
satu membran selektif ion. Ion meter dua kanal dibuat sebagai awal pengembangan sistem
sensor rasa atau electronic tongue (e-tongue) yang harusnya berupa ion meter multi-kanal.
Ion meter dibuat dengan menggunakan IC op-amp LF412 sebagai amplifier dan
mikrokontroller Atmega8535. Sementara itu, membran selektif ion dibuat dengan variasi
campuran lipid dioctyl phosphate (DOP) dan triocthyl methyl ammonium chloride
(TOMA). Dengan perbandingan massa masing-masing 9:1. Pada sensor rasa ini , lipid
menetukan selektifitas membran terhadap ion-ion tertentu. Luaran dari sensor rasa (ion
meter yang dilengkapi dengan membran selektif ion) berupa potensial listrik yang
selanjutnya dibandingkan dengan potensial elektroda referensi. Selanjutnya, prototipe
sensor rasa portable tersebut diuji kemampuan sensingnya terhadap lima macam larutan:
glukosa, KCl, kina, HCl dan MSG. Kelima larutan tersebut mewakili lima macam rasa
dasar, yakni rasa manis diwakili oleh glukosa, rasa asin diwakili oleh KCl, rasa pahit
diwakili oleh kina, rasa asam diwakili oleh HCl, dan umami diwakili oleh MSG. Setiap
larutan sampel dibuat dengan pelarut 1 mM KCl dan divariasi menjadi tujuh macam
konsentrasi. Sebagai hasilnya, sensor rasa dengan membran lipid campuran 9:1
menujukkan kecenderungan respon terhadap kation sampel, sehingga menghasilkan besar
potensial yang mengalami peningkatan untuk setiap kenaikan konsentrasi.
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