Smartphone-Based Extension of the Curcumin/Cellophane pH Sensing Method
Smartphone-based extension of the previously published (Food Anal Meth doi:10.1007/s12161-015-0102-1 2015a) curcumin-coloured cellophane test strip pH sensing method is reported. Replacement of the ultraviolet-visible (UV–VIS) spectrophotometer with an android-based device can reach a wider audience, in accordance with the ongoing, significant increase in the field of smartphone-based analytical applications. On the basis of the colouring effect of curcumin on biopolymers, a new, qualitative, quick and low-cost method for pH determination is developed, which provides more sensitive detection than the bare eye checking. Next to cellophane substrate, curcumin/gelatine sensor arrays are studied, too. Food-industrial and health-care products are targeted with a modular system based on the curcumin-coloured cellophane/gelatine sensor array, a free android application running on a smartphone, together with a home-written data analyser software. In situ monitoring and local pH mapping in liquid cell, investigation with curcumin dotted cellophane array and long-time stable, dried curcumin-coloured gelatine capsules are discussed.
KeywordsSmartphone pH Curcumin Cellophane Gelatine Sensor array
Compliance with Ethical Standards
Conflict of Interest
Mária Pávai declares that she has no conflict of interest. Eszter Orosz declares that she has no conflict of interest. András Paszternák declares that he has no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
- Daniels JA, Krishnamurthi R, Rizvi SSH (1985) J Food Prot 6:476–545Google Scholar
- de Almeida PV, Grégorio AMT, Marchado MAN, de Lima AAS, Azevedo LR (2008) J Contemp Dent Pract 9:72–80Google Scholar
- Duan J, Qiu G (2004) Proc IEEE Int Conf Image Graph 55–58Google Scholar
- GMIA—Gelatin Manufacturers Institute of America (2012) http://www.gelatin-gmia.com/images/GMIA_Gelatin_Manual_2012.pdf
- Yetisen AK, Martinez-Hurtado JL, Garcia-Melendrez A, da Cruz Vasconcellosa F, Lowe CR (2014) Sensors Actuators B Chem 196:156–160Google Scholar