Sains Malaysiana 42(11)(2013):
1655–1661
Penghasilan
Estolida Berasaskan Asid Risinoleik-Oleik Menggunakan
Mangkin Asid Polihetero
(Production of Ricinoleic-Oleic Based Estolide Using Polyhetero
Acid Catalyst)
NOR ASIKIN MOHAMAD NORDIN1, AINOL HAYAH AHMAD NADZRI2, NADIA FARHANA2, JUMAT SALIMON2* & MOHD
AMBAR
YARMO2
1Program Pengajian Diploma, UTMSPACE, Universiti
Teknologi Malaysia, Kuala Lumpur
Jalan Semarak, 54100 Kuala Lumpur, Malaysia
2Pusat Pengajian Sains Kimia dan Teknologi Makanan, Fakulti Sains
dan Teknologi,
Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor,
Malaysia
Diserahkan: 30 Mac 2011/Diterima: Jun 2013
ABSTRAK
Kajian mengenai penghasilan estolida berasaskan kepada asid
risinoleik dan asid oleik telah dilakukan. Asid polihetero, asid
12-fosfotungstik dan asid silikotungstik telah digunakan sebagai mangkin dan
tindak balas dilakukan pada suhu 60 atau 90ºC, selama 10 atau 24 jam. Nisbah
mol antara asid risinoleik dan asid oleik ialah 2:1 dan peratus berat mangkin
terhadap reaktan adalah 5%. Spektrum FTIR produk estolida telah dibandingkan dengan
produk tindak balas yang menggunakan mangkin homogen asid perklorik.
Pembentukan estolida ditunjukkan dengan kehadiran tiga puncak baru pada 1733 cm-1 untuk
kumpulan berfungsi C=O ester, 967 cm-1 untuk -CH=CH- trans dan 1177 cm-1 untuk
C-O-C. Spektrum FTIR yang serupa juga telah diperoleh untuk
produk menggunakan mangkin homogen asid perklorik. Analisis LC-MS menunjukkan
terbentuk tiga puncak baru monoestolida pada masa penahanan (Rt) 8.6 (m/z 577), 10.2 (m/z 559) dan 12.1
minit (m/z 561). Hasil kajian menunjukkan tindak balas kondensasi antara
oleik-risinoleik dengan menggunakan asid perklorik, pepejal asid silikotungstik
dan asid fosfotungstik sebagai mangkin berjaya menghasilkan estolida masing-masing
dengan peratus hasil 70.2, 70.0 dan 60.8%.
Kata kunci: Asid oleik; asid risinoleik; estolida; tindak balas
kondensasi
ABSTRACT
A study on the production of oleic and ricinoleic acids based
estolide was carried out. Polyhetero acid of 12-phosphotungsti and
silicotungstic acids have been used in the reactions at 60ºC or 90ºC, for 10 or
24 h. The mole ratio of ricinoleic to oleic acids was 2:1 and weight percentage
of catalyst to the reactant used was 5%. The FTIR spectrum of the
estolide product was compared to reaction product using perchloric acid as
homogeneous catalyst. The estolide formation was shown by the existence of
three new peaks at 1733 cm-1 for C=O ester, 967 cm-1 for -CH=CH- trans and
1177 cm-1 for C-O-C, respectively. The same FTIR spectrum pattern was
observed for the reaction product using perchloric acid as homogeneous
catalyst. The LC-MS analysis showed that the formation of three new monoestolide
peaks at retention time (Rt) at
8.6 (m/z 577), 10.2 (m/z 559) and 12.1 min (m/z 561). The results showed that
the condensation reaction between oleic-ricinoleic acids by using perchloric
acid, solid acid silicotungstics and phosphotungstics acid as catalysts was
successfully formed the estolides with yields percentages of 70.2, 70.0 and
60.8%, respectively.
Keywords: Condensation reaction; estolide; oleic
acid; ricinoleic acid
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*Pengarang untuk surat-menyurat; email:
jumat@ukm.my
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