Fourier Transform Infrared (FTIR) Spectroscopy And Physicochemical Analysis For Authentication Of Olive Oil Adulterated With Sunflower Oil

Naquiah  Ahmad Nizar; Siti Aimi Sarah Zainal Abidin; Amirah Nur Syahirah Abd Ghafur; Aishah  Bujang; Nina Fadhilah  Jailani

Authors

Naquiah Ahmad Nizar
Siti Aimi Sarah Zainal Abidin
Amirah Nur Syahirah Abd Ghafur
Aishah Bujang
Nina Fadhilah Jailani

Keywords:

Olive Oil, Adulteration, Halal, Supply, Chain

Abstract

Olive oil has been listed as the top most common food fraud by European Commission and therefore requires constant development of authentication method. This study is conducted to determine the presence of sunflower oil in olive oil at 1, 5, 10 and 20% of adulteration percentage. Fourier Transform Infrared (FTIR) spectroscopy and physicochemical analysis such as specific gravity, refractive index, iodine value, acid value and colour were used to distinguished adulterated samples. The spectral differences between olive oil added with sunflower oil by using FTIR can be seen at frequency region 1402 cm−1 caused by =C–H bending, 1300 – 1000 cm−1 caused by C–O stretching and CH2– bending, 965 – 960 cm−1 caused by –HC=CH and 872 – 850 cm−1 caused by =CH2 wagging. Meanwhile, refractive index can detect differences only at 10% addition level. For the analysis specific gravity, iodine value and acid value were significantly difference (p<0.05) between olive oil and 5% addition of sunflower oil into olive oil which indicated that the 5% addition level can be detected. Colour analysis can determine significant differences at 1% addition. Ensuring olive oil at the highest quality is an importance value in halal supply chain.

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Author Biographies

Naquiah Ahmad Nizar

Malaysia Institute of Transport (MITRANS), Universiti Teknologi MARA, Shah Alam.

Siti Aimi Sarah Zainal Abidin

Malaysia Institute of Transport (MITRANS), Universiti Teknologi MARA, Shah Alam.

Amirah Nur Syahirah Abd Ghafur

Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam.

Aishah Bujang

Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam

Nina Fadhilah Jailani

Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam.

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