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Inhibition of palm oil oxidation by zeolite nanocrystals
Tan K.-H.a, Awala H., Mukti R.R.c, Wong K.-L., Rigaud B., Ling T.C., Aleksandrov H.A.f, Koleva I.Z.f, Vayssilov G.N.f, Mintova S., Ng E.-P.a
a School of Chemical Sciences, Universiti Sains Malaysia, Penang, Malaysia
b Laboratoire Catalyse and Spectrochimie, CNRS-ENSICAEN, Université de Caen, Caen, France
c Division of Inorganic and Physical Chemistry, Institut Teknologi Bandung, Bandung, Indonesia
d National Institute of Education, Nanyang Technological University, Singapore
e Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
f Faculty of Chemistry and Pharmacy, University of Sofia, Sofia, Bulgaria
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2015 American Chemical Society.The efficiency of zeolite X nanocrystals (FAU-type framework structure) containing different extra-framework cations (Li+, Na+, K+, and Ca2+) in slowing the thermal oxidation of palm oil is reported. The oxidation study of palm oil is conducted in the presence of zeolite nanocrystals (0.5 wt %) at 150 °C. Several characterization techniques such as visual analysis, colorimetry, rheometry, total acid number (TAN), FT-IR spectroscopy, 1H NMR spectroscopy, and Karl Fischer analyses are applied to follow the oxidative evolution of the oil. It was found that zeolite nanocrystals decelerate the oxidation of palm oil through stabilization of hydroperoxides, which are the primary oxidation product, and concurrently via adsorption of the secondary oxidation products (alcohols, aldehydes, ketones, carboxylic acids, and esters). In addition to the experimental results, periodic density functional theory (DFT) calculations are performed to elucidate further the oxidation process of the palm oil in the presence of zeolite nanocrystals. The DFT calculations show that the metal complexes formed with peroxides are more stable than the complexes with alkenes with the same ions. The peroxides captured in the zeolite X nanocrystals consequently decelerate further oxidation toward formation of acids. Unlike the monovalent alkali metal cations in the zeolite X nanocrystals (K+, Na+, and Li+), Ca2+ reduced the acidity of the oil by neutralizing the acidic carboxylate compounds to COO–(Ca2+)1/2 species.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Alkali metal cations,Characterization techniques,Extra-framework cations,Framework structures,H NMR spectroscopy,Oxidation products,Secondary oxidation products,Zeolite nanocrystals,Hot Temperature,Magnetic Resonance Spectroscopy,Nanoparticles,Oxidation-Reduction,Plant Oils,Spectroscopy, Fourier Transform Infrared,Zeolites[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]extra-framework cations,inhibition,oxidation,palm oil,zeolite nanocrystals[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1021/acs.jafc.5b00380[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]