Sains Malaysiana 45(7)(2016): 1169–1176

Characterization of HEC/PANI Film as a Potential Electroactive Packaging with pH Sensor

(Pencirian Filem HEC/PANI sebagai Potensi Pembungkus Elektroaktif dengan

Pengesanan pH)

NOORANIS MUSTAPHA¹, NOZIEANA KHAIRUDDIN¹, IDA IDAYU MUHAMAD¹*,

SHAHRIR HASHIM¹ & MD. BAZLUL MOBIN SIDDIQUE²

¹Department of Bioprocess and Polymer Engineering, Faculty of Chemical and Energy Engineering

Universiti Teknologi Malaysia, 81310 Skudai, Johor Darul Takzim, Malaysia

²Division of Chemical Engineering, Faculty of Engineering, Computing and Science

Swinburne University of Technology, Sarawak Campus, Jalan Simpang Tiga, 93350 Kuching, Sarawak, Malaysia

Received: 12 May 2015/Accepted: 27 January 2016

ABSTRACT

Interest in the use of intelligent packaging systems for food products has increased in recent years. Intelligent packaging systems are those that monitor the condition of packaged foods to give information regarding the quality of the packaged food during transport and storage. The potential of HEC/PANI film as pH indicator and pH sensor were evaluated. HEC/PANI film was prepared by solution blending and casting method. Fourier transform infrared (FTIR) spectroscopy showed that there was no chemical interaction between HEC and PANI. The film properties were retained chemically. The electrical conductivity increment from 1.14×105 to 2.2 ×105 S/cm was observed when PANI was incorporated into the HEC film matrix. Field emission scanning electron microscopy (FESEM) showed that the electrical conductance network of PANI was formed in HEC/PANI film. The electrical sensitivity of the film has been studied with I-V characterization. The changes in color and current of HEC/PANI film on interaction to pH buffer 1-14 shows its suitability as pH indicator and pH sensor for food.

Keywords: Intelligent packaging; hydroxyethylcellulose; pH indicator; pH sensor; polyaniline

ABSTRAK

Kepentingan dalam penggunaan sistem pembungkusan pintar bagi produk makanan telah meningkat sejak kebelakangan ini. Sistem pembungkusan pintar adalah pemantauan keadaan makanan yang dibungkus untuk memberikan maklumat mengenai kualiti makanan yang dibungkus semasa pengangkutan dan penyimpanan. Potensi HEC/PANI filem sebagai penunjuk pH dan sensor pH dinilai. HEC/PANI filem disediakan oleh pengadunan larutan dan kaedah tuangan. Transformasi Fourier inframerah (FTIR) spektroskopi menunjukkan bahawa tidak ada interaksi kimia antara HEC dan PANI. Ciri-ciri filem dikekalkan secara kimia. Peningkatan kekonduksian elektrik dari 1.14×105 kepada 2.2×105 S/cm diperhatikan apabila PANI telah dimasukkan ke dalam filem matriks HEC. Pancaran medan mikroskop elektron imbasan (FESEM) menunjukkan bahawa rangkaian konduktans elektrik PANI terbentuk dalam filem HEC/PANI. Kepekaan filem elektrik telah dikaji dengan pencirian I-V. Perubahan dalam warna dan filem semasa HEC/PANI pada interaksi untuk penampan pH 1-14 menunjukkan kesesuaiannya sebagai penunjuk pH dan sensor pH untuk makanan.

Kata kunci: Hidroksietilselulosa; pembungkusan pintar; pengesan pH; penunjuk pH; polianilina

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*Corresponding author; email: idayu@cheme.utm.my