Sains Malaysiana
39(6)(2010): 891–899
Optimisation of
Ammonium Tartrate and Glucose Concentration for Gamma Linolenic Acid Production
by Cunninghamella sp. 2A1.
(Pengoptimuman
Kepekatan Ammonium Tartarat dan Glukosa Terhadap Penghasilan Asid Gamma Linolenik oleh Cunninghamella sp.
2A1.)
Farhila Muhid, Abdul Jalil Abdul Kader, Wan Mohtar Wan Yusoff, Othman Omar
& Aidil Abdul Hamid*
School of Biosciences and Biotechnology
Faculty of Science and Technology, Universiti Kebangsaan
Malaysia, 43600 Bangi, Selangor, Malaysia.
Diserahkan: 21 Oktober 2009 / Diterima: 11 Februari 2010
ABSTRACT
The effects of ammonium
tartrate and glucose concentration on biomass, lipid and GLA accumulation
in Cunninghamella sp. 2A1 were investigated using Response
Surface Methodology (RSM). Cultivation was carried out in
250 mL shake flask containing 100 mL of nitrogen limiting medium (with various
combinations of concentration of ammonium tartrate (1-3 g/L) and glucose (30-60
g/L) at 30°C and 250 rpm agitation for 120 h. The concentration of both
compounds significantly affected the biomass, lipid and GLA yield
(p<0.05), with the production of each of them being represented by quadratic
models. Higher concentration of ammonium tartrate and glucose (2.99 and 59.33
g/L, respectively) was required for enhanced biomass production whereas low
nitrogen content with excess glucose was otherwise favoured for lipid and GLA production.
Ammonium tartrate and glucose concentration at 1 and 43 g/L, respectively were
estimated by the model and proven to give the highest lipid production and GLA yield
of 31.06 % (g/g biomass) and 4.15 ×10-2 (g/g
lipid less biomass), respectively.
Keywords: C/N ratio; Cunninghamella sp.; gamma linolenic acid; lipid; Response Surface Methodology (RSM)
ABSTRAK
Kesan kepekatan ammonium
tartarat dan glukosa terhadap penghasilan biojisim, lipid dan GLA oleh Cunninghamella sp. 2A1 dikaji menggunakan Kaedah Gerak balas
Permukaan (RSM). Pengkulturan dilakukan dalam kelalang goncangan 250
mL yang mengandungi 100 mL medium terhad nitrogen (dengan pelbagai kombinasi
kepekatan ammonium tartarat (1-3 g/L) dan glukosa (30-60 g/L) pada 30°C dengan
kadar goncangan 250 rpm selama 120 j. Kepekatan kedua-dua sebatian ini memberi
kesan signifikan terhadap penghasilan biojisim, lipid dan GLA (p<0.05)
yang masing-masing diwakili oleh model kuadratik. Kepekatan ammonium tartarat
dan glukosa yang lebih tinggi iaitu masing-masing pada 2.99 dan 59.33 g/L,
didapati perlu untuk merangsang penghasilan biojisim sedangkan kandungan
ammonium tartarat yang rendah dengan kepekatan glukosa yang tinggi pula
diperlukan untuk membantu meningkatkan penghasilan lipid dan GLA.
Kepekatan ammonium tartarat dan glukosa masing-masing pada 1 dan 43 g/L telah
dianggarkan oleh model tersebut dan terbukti memberikan penghasilan lipid dan GLA tertinggi
iaitu masing-masing sebanyak 31.06 % (g/g biojisim) dan 4.15 × 10-2 (g/g
biojisim tanpa lipid).
Kata kunci: Nisbah
C/N; asid gamma linolenik; Cunninghamella sp.; lipid; Kaedah Gerak Balas Permukaan (RSM)
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*Pengarang
untuk surat-menyurat; email: aidilah@ukm.my
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