agar and AGARASE

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Agar and agarases:

Agar and agarases Presented by Dr. Cheba Ben Amar Associate Professor of Biotechnology (MCA) University of Science and Technology Mohamed Boudiaf (USTOMB)Oran, Algeria

الأغاروالأغاراز:

الأغاروالأغاراز مقدمة من قبل د. بن عمر شبة أستاذ محاضر أ –قسم البيوتكنولوجيا - كلية العلوم- جامعة العلوم والتكنولوجيا وهران

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Agar/ Agarases

PowerPoint Presentation:

In Japan, agar has been used as a food since several hundred years. From Japan its use extended to other oriental countries during the seventeenth and eighteenth centuries . Nowadays, agar has a wide variety of uses due to its stabilizing and gelling characteristics . Agar has been mainly used in microbiological media because it is not easy for microorganisms to metabolize as well as forms clear, stable and firm gels

PowerPoint Presentation:

It is a Generally Recognized as Safe (GRAS) food additive, which is used in icings , glazes, processed cheese , jelly sweets , and marshmallows .

AGAR SOURCES:

AGAR SOURCES Agar is a complex polysaccharide derived from the agarophytes of the Rhodophytea such as Gelidium sp, Gracilaria sp and pterocladia sp . the agar gel comprises a matrix of double helical polymer chaines held together by hydrogen bonds.

AGAR STRUCTURE:

AGAR STRUCTURE Agar is consisting of Agarose and agaropection . Agarose is linear polysaccharide composed of alternating residues of 3-0-linked ß-D- galacto pyranose and 4-0-linked 3.6– anhydro –α– l – galactopyranose , while agaropectin is a polysaccharide containing substituent groups such as sulfate, mithoxyl and pyruvate (1)

Structure of agarose.:

Structure of agarose.

Agarases classification :

Agarases classification

Agarases sources:

Agarases sources Enzymes capable of degrading agar have been isolated from molluscs (2) and from bacteria of the genera Alteromonas (3-4) , cytophoga (5, 6) , pseudomonas (7-8) pseudoalteromonas (9) streptomyces (10-11) , vibrio (12-13) and Bacillus (14)

Agar degradation types:

Agar degradation types

Agar degradation types:

Agar degradation types

Agarase activity in agar and agarose respectively:

Agarase activity in agar and agarose respectively

Thank you for your kind interest:

Thank you for your kind interest

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