Isoamylase (Glycogen 6-glucanohydrolase) 

Pure Isoamylase (Glycogen 6-glucanohydrolase) for use in biochemical enzyme assays and in vitro diagnostic analysis. Isoamylase, Fructanase (E-FRMXPD) and Amyloglucosidase (E-AMGDF) are used in the enzyme hydrolysis step of two validated methods for the determination of polydextrose (a low molar mass dietary fiber) in foods: AOAC method 2000.11 and Chinese GB Standard 5009.245-2016.

Please refer to E-ISAMYHP for high purity enzyme suitable for use in starch structural research.

CAZy Family: GH13
CAS: 9067-73-6 

isoamylase; glycogen 6-alpha-D-glucanohydrolase

Highly purified. From Pseudomonas sp. Electrophoretically homogeneous.
In 3.2 M ammonium sulphate.
Supplied at ~ 200 U/mL.

Specific activity: 
~ 180 U/mg (40oC, pH 4.0 on oyster glycogen) (equivalent to 16 MU Sigma Units/mg).

Stability: > 4 years at 4oC.

Product Code
600 Units

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Validation of Methods



AOAC Method 2000.11


Isoamylase (Glycogen 6-glucanohydrolase)

CAZy Family: GH13
CAS: 9067-73-6 

isoamylase; glycogen 6-alpha-D-glucanohydrolase

In 3.2 M ammonium sulphate.

> 4 years at 4oC.

Specific activity:
~ 180 U/mg (40oC, pH 4.0 on oyster glycogen) (equivalent to 16 MU Sigma Units/mg).

Unit definition:
One unit of isoamylase activity is the amount of enzyme required to release one μmole of D-glucose reducing sugar equivalent in the presence of oyster glycogen per min at pH 4.0 and 40oC.

Hydrolysis of (1,6)-α-D-glucosidic branch linkages in glycogen, amylopectin and their β-limit dextrins.

Applications in carbohydrate research and in the food and feeds, and cereals industry.

Deficiency of maize starch-branching enzyme i results in altered starch fine structure, decreased digestibility and reduced coleoptile growth during germination.

Xia, H., Yandeau-Nelson, M., Thompson, D. B. & Guiltinan, M. J. (2011). BMC Plant Biology, 11(1), 95-107.

Effect of a gibberellin-biosynthesis inhibitor treatment on the physicochemical properties of sorghum starch.

Li, E., Hasjim, J., Dhital, S., Godwin, I. D. & Gilbert, R. G. (2011). Journal of Cereal Science, 53(3), 328-334.

Characterization of starch granules in rice culms for application of rice straw as a feedstock for saccharification.

Matsuki, J., Park, J. Y., Shiroma, R., Arai-Sanoh, Y., Ida, M., Kondo, M., Motobayashi, K. & Tokuyasu, K. (2010). Bioscience, Biotechnology, and Biochemistry, 74(8), 1645-1651.

Physico-chemical properties of potato starches.

Alvani, K., Qi, X., Tester, R. F. & Snape, C. E. (2011). Food Chemistry, 125(3), 958-965.

Determination of polydextrose as dietary fiber in foods.

Craig, S. A. S., Holden, J. F. & Khaled, M. Y. (2000). Journal of AOAC International, 83(4), 1006-1012.

Amylolysis of wheat starches. II. Degradation patterns of native starch granules with varying functional properties.

Blazek, J. & Copeland, L. (2010). Journal of Cereal Science, 52(2), 295-302.

Differences in structures of starch hydrolysates using saliva from different individuals.

Nantanga, K. K. M., Chan, E., Suleman, S., Bertoft, E. & Seetharaman, K. (2013). Starch‐Stärke, 65(7‐8), 709-713.

Determination of polydextrose in foods by ion chromatography: collaborative study.

Craig, S. A. S., Holden, J. F. & Khaled, M. Y. (2001). Journal of AOAC International, 84(2), 472-478.

Structure and function of starch and resistant starch from corn with different doses of mutant amylose-extender and floury-1 alleles.

Yao, N., Paez, A. V. & White, P. J. (2009). Journal of Agricultural and Food Chemistry, 57(5), 2040-2048.

Molecular structure and granule morphology of native and heat‐moisture‐treated pinhão starch.

Pinto, V. Z., Moomand, K., Vanier, N. L., Colussi, R., Villanova, F. A., Zavareze, E. R., Lim, L. T. & Dias, A. R. G. (2015). International Journal of Food Science & Technology, 50(2), 282-289.

An exceptionally cold-adapted alpha-amylase from a metagenomic library of a cold and alkaline environment.

Vester, J. K., Glaring, M. A. & Stougaard, P. (2015). Applied Microbiology and Biotechnology, 99(2), 717-727.

Crystallization and chain reorganization of debranched rice starches in relation to resistant starch formation.

Kiatponglarp, W., Tongta, S., Rolland-Sabaté, A. & Buléon, A. (2015). Carbohydrate Polymers, 122, 108-114.

Amylose and amylopectin branch chain reactivity in a model derivatization system.

Hong, J. S. & Huber, K. C. (2015). Carbohydrate Polymers, 122, 437-445.

Preparation of cross-linked maize (Zea mays L.) starch in different reaction media.

Hong, J. S., Gomand, S. V., & Delcour, J. A. (2015). Carbohydrate Polymers, 124, 302-310.

Structural characteristics of slowly digestible starch and resistant starch isolated from heat-moisture treated waxy potato starch.

Lee, C. J. & Moon, T. W. (2015). Carbohydrate Polymers, 125, 200-205.

Synergistic amylomaltase and branching enzyme catalysis to suppress cassava starch digestibility.

Sorndech, W., Meier, S., Jansson, A. M., Sagnelli, D., Hindsgaul, O., Tongta, S. & Blennow, A. (2015). Carbohydrate Polymers, 132, 409-418.

Relationships among genetic, structural, and functional properties of rice starch.

Kong, X., Chen, Y., Zhu, P., Sui, Z., Corke, H. & Bao, J. (2015). Journal of Agricultural and Food Chemistry, 63(27), 6241-6248.

Effect of heat-moisture treatment on the structural, physicochemical, and rheological characteristics of arrowroot starch.

Pepe, L. S., Moraes, J., Albano, K. M., Telis, V. R. & Franco, C. M. (2016). Food Science and Technology International, 22(3), 256-265.

Molecular and thermal characterization of starches isolated from African rice (Oryza glaberrima).

Gayin, J., Bertoft, E., Manful, J., Yada, R. Y. & Abdel‐Aal, E. S. M. (2016). Starch‐Stärke, 68(1-2), 9-19.

Lubrication of starch in ionic liquid-water mixtures: Soluble carbohydrate polymers form a boundary film on hydrophobic surfaces.

Yakubov, G. E., Zhong, L., Li, M., Boehm, M. W., Xie, F., Beattie, D. A., Halley, P. J. & Stokes, J. R. (2015). Carbohydrate Polymers, 133, 507-516.

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