The effects of the composition of growth medium and fermentation conditions on the production of lipase by R. delemar

Ünsal AÇIKEL; Mehtap ERŞAN; Yeşim SAĞ AÇIKEL

Makale detayları

The effects of the composition of growth medium and fermentation conditions on the production of lipase by R. delemar

Yazarlar:

Ünsal AÇIKEL | Mehtap ERŞAN | Yeşim SAĞ AÇIKEL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Biology 2011 Vol.35 Issue 1, pp.35-44

Belge Tipi:

Makale

Yayın Tarihi:

12/2010

Belge Dili:

Türkçe

Document ID (Org No.):

2000812953

Sıklık:

İki Aylık

eISSN:

1303-6092

pISSN:

1300-0152

Anahtar kelimeler:

Özet:

 

Lipases (triacylglycerol hydrolases) are hydrolytic enzymes that can catalyze the hydrolysis of the ester bond of long-chain acylglycerols at the oil-water interface. The present study investigated the effects of inducers, surface-active materials, activators, and inhibitors in the fermentation medium on lipase activity in Rhizopus delemar. In the presence of certain commercial oils and tributyrin as an inducer, lipase activity decreased in the order of sunflower oil > soybean oil > hazelnut oil > corn oil > tributyrin > olive oil. In addition, the effects of the stirring and aeration rates on lipase activity were investigated. To investigate the effect of surface-active materials on lipase activity 2 different surface-active materials, Tween-80 and rhamnolipid (biosurfactant), were used as comparatives with tributyrin. Maximum lipase activity was observed in the fermentation medium containing Tween-80 as both an inducer and surface-active material. The combined effects of molasses and sucrose on lipase production by R. delemar were also investigated. Lipase activity in the presence of activators decreased in the order of NaCl > KCl > CaCl2 > MgCl2 > gum arabic > EDTA, and maximum lipase activity of 964.55 U/L was obtained. The presence of heavy metal ions in the fermentation media severely inhibited lipase activity. Lipase activity in the presence of heavy metal ions decreased in the order of Fe2+ > Mn2+> Co2+> Ni2+.

 

Lipases (triacylglycerol hydrolases) are hydrolytic enzymes that can catalyze the hydrolysis of the ester bond of long-chain acylglycerols at the oil-water interface. The present study investigated the effects of inducers, surface-active materials, activators, and inhibitors in the fermentation medium on lipase activity in Rhizopus delemar. In the presence of certain commercial oils and tributyrin as an inducer, lipase activity decreased in the order of sunflower oil > soybean oil > hazelnut oil > corn oil > tributyrin > olive oil. In addition, the effects of the stirring and aeration rates on lipase activity were investigated. To investigate the effect of surface-active materials on lipase activity 2 different surface-active materials, Tween-80 and rhamnolipid (biosurfactant), were used as comparatives with tributyrin. Maximum lipase activity was observed in the fermentation medium containing Tween-80 as both an inducer and surface-active material. The combined effects of molasses and sucrose on lipase production by R. delemar were also investigated. Lipase activity in the presence of activators decreased in the order of NaCl > KCl > CaCl2 > MgCl2 > gum arabic > EDTA, and maximum lipase activity of 964.55 U/L was obtained. The presence of heavy metal ions in the fermentation media severely inhibited lipase activity. Lipase activity in the presence of heavy metal ions decreased in the order of Fe2+ > Mn2+> Co2+> Ni2+.

Makale detayları

The effects of the composition of growth medium and fermentation conditions on the production of lipase by R. delemar

Yazarlar:

Ünsal AÇIKEL | Mehtap ERŞAN | Yeşim SAĞ AÇIKEL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Biology 2011 Vol.35 Issue 1, pp.35-44

Belge Tipi:

Makale

Yayın Tarihi:

12/2010

Belge Dili:

Türkçe

Document ID (Org No.):

2000812953

Sıklık:

İki Aylık

eISSN:

1303-6092

pISSN:

1300-0152

Key words: Lipase production

R. delemar

fermentation

batch stirred reactor

Sayı

Makale detayları

The effects of the composition of growth medium and fermentation conditions on the production of lipase by R. delemar

Yazarlar: Ünsal AÇIKEL | Mehtap ERŞAN | Yeşim SAĞ AÇIKEL

Yayıncı: TUBITAK

Dergi: Turkish Journal of Biology 2011 Vol.35 Issue 1, pp.35-44

Belge Tipi: Makale

Yayın Tarihi: 12/2010

Belge Dili: Türkçe

Document ID (Org No.): 2000812953

Sıklık: İki Aylık

eISSN: 1303-6092

pISSN: 1300-0152

Key words: Lipase production

R. delemar

fermentation

batch stirred reactor

Sayı

Yazarlar:

Ünsal AÇIKEL | Mehtap ERŞAN | Yeşim SAĞ AÇIKEL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Biology 2011 Vol.35 Issue 1, pp.35-44

Belge Tipi:

Makale

Yayın Tarihi:

12/2010

Belge Dili:

Türkçe

Document ID (Org No.):

2000812953

Sıklık:

İki Aylık

eISSN:

1303-6092

pISSN:

1300-0152