Sains Malaysiana 41(6)(2012): 731–738

 

D-Optimal Design Optimization of Jatropha curcas L. Seed OilHydrolysis via

Alkali-Catalyzed Reactions

(Pengoptimuman Reka Bentuk D-Optimum Hidrolisis Minyak Biji Jatropha curcas L.

Melalui Tindak Balas Mangkin Alkali)

 

 

Jumat Salimon*, B Asharmudhaffar Abdullah & Nadia Salih

School of Chemical Sciences and Food Technology, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

 

Received: 11 October 2010 / Accepted: 20 January 2012

 

ABSTRACT

Potassium hydroxide (KOH)-catalyzed reactions were utilized to hydrolyze Jatropha curcas seed oil. In this study, the effect of ethanolic KOH concentration, reaction temperature and reaction time to the free fatty acid (FFA) produced were investigated. D-Optimal Design was employed to study the significance of these factors and optimum conditions for the technique was predicted. The results showed that ethanolic KOH concentration was a significant variable for hydrolysis of J. curcas seed oil. In 18 experimental designs, FFA percentage of hydrolyzed J. curcas seed oil increased from 1.89% to 102.2%. The optimal conditions of response were found at 1.75M of ethanolic KOH, 65 °C and at 2 h reaction time. Fourier Transforms Infrared Spectroscopy (FTIR) spectrum analysis confirmed the concentration of ethanolic KOH i.e. at 1.00, 1.50 dan 1.75 M affect the percentage yields of J. curcas seed oil hydrolysis process.

 

Keywords: Alkaline hydrolysis; D-optimal design; Jatropha curcas seed oil

 

ABSTRAK

 

Tindak balas bermangkin kalium hidroksida (KOH) telah digunakan untuk hidrolisis minyak biji Jatropha curcas. Kesan nisbah kepekatan KOH beretanol, suhu dan masa tindak balas terhadap penghasilan asid lemak bebas (ALB) telah dikaji. Reka bentuk D-Optimum telah digunakan untuk menentukan keberkesanan parameter tindak balas dan nilai optimumnya diramalankan serta ditentukan. Keputusan kajian menunjukkan bahwa kepekatan KOH beretanol merupakan parameter yang bererti bagi hidrolisis minyak J. curcas. Reka bentuk 18 uji kaji menunjukkan peratus ALB hasil hidrolisis minyak J. curcas telah ditingkatkan daripada 1.89% kepada 102.2%. Keadaan gerak balas optimum telah dicerap pada 1.75 M KOH beretanol, suhu 65°C dan 2 jam masa tindak balas. Analisis Spektroskopi Inframerah Fourier Transform (FTIR) telah membuktikan bahwa pertambahan kepekatan KOH beretanol pada 1.00, 1.50 dan 1.75 M meningkatkan peratusan hasil proses hidrolisis minyak biji J. curcas.

 

Kata kunci: Hidrolisis beralkali; minyak biji; reka bentuk D-optimal; Jatropha curcas

 

 

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*Corresponding author; e-mail: jumat@ukm.my

 

 

 

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