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Product code: I-AZPUL

3 g

Prices exclude VAT

This product has been discontinued

Content: 3 g
Shipping Temperature: Ambient
Storage Temperature: Ambient
Physical Form: Powder
Stability: > 10 years under recommended storage conditions
Substrate For (Enzyme): Isoamylase, Isopullulanase, Neopullulanase, Pullulanase/Limit-Dextrinase
Assay Format: Spectrophotometer (Semi-quantitative), Petri-dish (Qualitative)
Detection Method: Absorbance
Wavelength (nm): 590

This product has been discontinued (read more).

High purity dyed and crosslinked insoluble AZCL-Pullulan for identification of enzyme activities in research, microbiological enzyme assays and in vitro diagnostic analysis.

Substrate for the assay of limit-dextrinase (pullulanase).

Browse our full range of insoluble chromogenic substrate products.

Certificate of Analysis
Safety Data Sheet
Application Note Assay Protocol
Megazyme publication
Measurement of the content of limit-dextrinase in cereal flours.

McCleary, B. V. (1992). Carbohydrate Research, 227, 257-268.

Procedures for the quantitative extraction, activation, and assay of limit-dextrinase in cereal flours have been developed. Extraction and activation require incubation in buffer containing 20mm cysteine for at least 16 h or with 25mM dithiothreitol for 5 h. Activity is assayed with a soluble, dyed substrate (Red-Pullulan) or an insoluble, dyed, and cross-linked substrate (Azurine-CL-Pullulan) which is dispensed in tablet form (Limit-DextriZyme tablets).

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Biochemical and synergistic properties of a novel alpha‐amylase from Chinese nong‐flavor Daqu.

Chen, L., Yi, Z., Fang, Y., Jin, Y., He, K., Xiao, Y., Zhao, D., Luo, H., He, H., Sun, Q. & Zhao, H. (2021). Microbial Cell Factories, 20(1), 1-15.

Background: Daqu is the most important fermentation starter for Chinese liquor, with large number of microbes and enzymes being openly enriched in the Daqu system over thousands of years. However, only a few enzymes have been analyzed with crude protein for total liquefying power and saccharifying power of Daqu. Therefore, the complex enzymatic system present in Daqu has not been completely characterized. Moreover, their pivotal and complicated functions in Daqu are completely unknown. Results: In this study, a novel α-amylase NFAmy13B, from GH13_5 subfamily (according to the Carbohydrate-Active enZYmes Database, CAZy) was successfully heterologous expressed by Escherichia coli from Chinese Nong-flavor (NF) Daqu. It exhibited high stability ranging from pH 5.5 to 12.5, and higher specific activity, compared to other GH13_5 fungal α-amylases. Moreover, NFAmy13B did not show activity loss and retained 96% residual activity after pre-incubation at pH 11 for 21 h and pH 12 for 10 h, respectively. Additionally, 1.25 mM Ca2+ significantly improved its thermostability. NFAmy13B showed a synergistic effect on degrading wheat starch with NFAmy13A (GH13_1), another α-amylase from Daqu. Both enzymes could cleave maltotetraose and maltopentaose in same degradation pattern, and only NFAmy13A could efficiently degrade maltotriose. Moreover, NFAmy13B showed higher catalytic efficiency on long-chain starch, while NFAmy13A had higher catalytic efficiency on short-chain maltooligosaccharides. Their different catalytic efficiencies on starch and maltooligosaccharides may be caused by their discrepant substrate-binding region. Conclusions: This study mined a novel GH13_5 fungal α-amylase (NFAmy13B) with outstanding alkali resistance from Nong-flavor (NF) Daqu. Furthermore, its synergistic effect with NFAmy13A (GH13_1) on hydrolyzing wheat starch was confirmed, and their possible contribution in NF Daqu was also speculated. Thus, we not only provide a candidate α-amylase for industry, but also a useful strategy for further studying the interactions in the complex enzyme system of Daqu.

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Metatranscriptomics Reveals the Functions and Enzyme Profiles of the Microbial Community in Chinese Nong-Flavor Liquor Starter.

Huang, Y., Yi, Z., Jin, Y., Huang, M., He, K., Liu, D., Luo, H., Zhao, D., He, H., Fang, Y. & Zhao, H. (2017). Frontiers in Microbiology, 8, 1747.

Chinese liquor is one of the world's best-known distilled spirits and is the largest spirit category by sales. The unique and traditional solid-state fermentation technology used to produce Chinese liquor has been in continuous use for several thousand years. The diverse and dynamic microbial community in a liquor starter is the main contributor to liquor brewing. However, little is known about the ecological distribution and functional importance of these community members. In this study, metatranscriptomics was used to comprehensively explore the active microbial community members and key transcripts with significant functions in the liquor starter production process. Fungi were found to be the most abundant and active community members. A total of 932 carbohydrate-active enzymes, including highly expressed auxiliary activity family 9 and 10 proteins, were identified at 62°C under aerobic conditions. Some potential thermostable enzymes were identified at 50, 62, and 25°C (mature stage). Increased content and overexpressed key enzymes involved in glycolysis and starch, pyruvate and ethanol metabolism were detected at 50 and 62°C. The key enzymes of the citrate cycle were up-regulated at 62°C, and their abundant derivatives are crucial for flavor generation. Here, the metabolism and functional enzymes of the active microbial communities in NF liquor starter were studied, which could pave the way to initiate improvements in liquor quality and to discover microbes that produce novel enzymes or high-value added products.

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Analysis and characterization of cultivable extremophilic hydrolytic bacterial community in heavy‐metal‐contaminated soils from the Atacama Desert and their biotechnological potentials.

Moreno, M. L., Piubeli, F., Bonfa, M. R. L., García, M. T., Durrant, L. R. & Mellado, E. (2012). Journal of Applied Microbiology, 113(3), 550-559.

Aims: To isolate and characterize the cultivable community of hydrolase producers (amylase, protease, lipase, DNase, xylanase and pullulanase) inhabiting heavy-metal-contaminated soils in extreme conditions from the Atacama Desert. Methods and Results: A total of 25 bacterial strains showing hydrolytic activities have been selected including halotolerants, extremely halotolerants and moderate halophiles. Most hydrolase producers were assigned to the family Bacillaceae, belonging to the genera Bacillus (nine strains), Halobacillus (seven strains) and Thalassobacillus (five strains) and four isolates were related to members of the families Pseudomonadaceae, Halomonadaceae and Staphylococcaceae. The selected strains were then characterized for their tolerance pattern to six heavy metals, measured as minimal inhibitory concentrations (MICs). Conclusions: The diversity found in the cultivable bacterial community analysed is more limited than that detected in other ecological studies owing to the restrictive conditions used in the screening. The dominant bacteria were Firmicutes and particularly, species related to the genus Bacillus. Significance and Impact of the Study: This study is focused on the characterization of extremophilic hydrolytic bacteria, providing candidates as a source of novel enzymes with biotechnological applications.

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Mining Dictyoglomus turgidum for enzymatically active carbohydrases.

Brumm, P., Hermanson, S., Hochstein, B., Boyum, J., Hermersmann, N., Gowda, K. & Mead, D. (2011). Applied Biochemistry and Biotechnology, 163(2), 205-214.

The genome of Dictyoglomus turgidum was sequenced and analyzed for carbohydrases. The broad range of carbohydrate substrate utilization is reflected in the high number of glycosyl hydrolases, 54, and the high percentage of CAZymes present in the genome, 3.09% of its total genes. Screening a random clone library generated from D. turgidum resulted in the discovery of five novel biomass-degrading enzymes with low homology to known molecules. Whole genome sequencing of the organism followed by bioinformatics-directed amplification of selected genes resulted in the recovery of seven additional novel enzyme molecules. Based on the analysis of the genome, D. turgidum does not appear to degrade cellulose using either conventional soluble enzymes or a cellulosomal degradation system. The types and quantities of glycosyl hydrolases and carbohydrate-binding modules present in the genome suggest that D. turgidum degrades cellulose via a mechanism similar to that used by Cytophaga hutchinsonii and Fibrobacter succinogenes.

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Pseudoalteromonas arctica sp. nov., an aerobic, psychrotolerant, marine bacterium isolated from Spitzbergen.

Al Khudary, R., Stößer, N. I., Qoura, F. & Antranikian, G. (2008). International Journal of Systematic and Evolutionary Microbiology, 58(9), 2018-2024.

A novel aerobic, psychrotolerant marine bacterium was isolated at 4°C from seawater samples collected from Spitzbergen in the Arctic. The strain was a polar-flagellated, Gram-negative bacterium that grew optimally at 10–15°C and pH 7–8 in media containing 2–3 % NaCl (w/v), using various carbohydrates and organic acids as substrates. The main fatty acid components included 16 : 0 (12.7 % of total fatty acids), straight-chain saturated fatty acid methyl ester (FAME) and 16 : 1ω7c (40.2 %) monounsaturated FAME. Phylogenetic analysis revealed a close relationship (99 % 16S rRNA gene sequence similarity) between the novel isolate and Pseudoalteromonas elyakovii KMM 162T and some other species of the genus Pseudoalteromonas. The DNA G+C content of the novel strain was 39 mol%. DNA–DNA hybridization showed only 47.6 % DNA–DNA relatedness with P. elyakovii KMM 162T, 44.2 % with Pseudoalteromonas distincta KMM 638T and 22.6 % with Pseudoalteromonas nigrifaciens NCIMB 8614T Based on phylogenetic and phenotypic characteristics, this isolate represents a novel species of the genus Pseudoalteromonas for which the name Pseudoalteromonas arctica is proposed; the type strain is A 37-1-2T (=LMG 23753T=DSM 18437T).

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Bacillus plakortidis sp. nov. and Bacillus murimartini sp. nov., novel alkalitolerant members of rRNA group 6.

Borchert, M. S., Nielsen, P., Graeber, I., Kaesler, I., Szewzyk, U., Pape, T., Antranikian, G. & Schäfer, T. (2007). International Journal of Systematic and Evolutionary Microbiology, 57(12), 2888-2893.

The Gram-positive, alkali- and salt-tolerant marine bacterium strain P203T is described together with its closest phylogenetic neighbour, terrestrial isolate LMG 21005T. Strain P203T was isolated from material from the sponge Plakortis simplex that was obtained from the Sula-Ridge, Norwegian Sea. Strain LMG 21005T was an undescribed strain that was isolated from a church wall mural in Germany. Strains P203T and LMG 21005T were identified as novel alkalitolerant members of the Bacillus rRNA group 6 with a 16S rRNA gene sequence similarity of 99.5 %. The closest described neighbour, Bacillus gibsonii DSM 8722T, showed 99.0 % gene sequence similarity with P203T and 98.8 % similarity with strain LMG 21005T. Despite the high 16S rRNA gene sequence similarity, DNA–DNA cross-hybridization revealed only 25.8–34.1 % similarity amongst the three strains. The DNA G+C contents were 41.1 mol% for strain P203T and 39.6 mol% for strain LMG 21005T. Both strains grew well between pH 7 and pH 11. Strain P203T showed growth at moderate temperatures (from 4 to 30°C) and in the presence of up to 12 % (w/v) NaCl at pH 9.7, whereas strain LMG 21005T was not salt tolerant (up to 4 % NaCl) and no growth was observed at 4°C. The major fatty acids of strains P203T, LMG 21005T and the type strain of B. gibsonii were the saturated terminally methyl-branched compounds iso-C15 : 0 (19.8, 15.6 and 28.0 %, respectively) and anteiso-C15 : 0 (57.1, 48.6 and 45.2 %, respectively). Physiological and biochemical tests allowed genotypic and phenotypic differentiation of strains P203T and LMG 21005T from the six related Bacillus species with validly published names and supported the proposal of two novel species, Bacillus plakortidis [type strain P203T (=DSM 19153T=NCIMB 14288T)] and Bacillus murimartini [type strain LMG 21005T (=NCIMB 14102T)].

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Cloning, sequencing, and characterization of a heat-and alkali-stable type I pullulanase from Anaerobranca gottschalkii.

Bertoldo, C., Armbrecht, M., Becker, F., Schäfer, T., Antranikian, G. & Liebl, W. (2004). Applied and Environmental Microbiology, 70(6), 3407-3416.

The gene encoding a type I pullulanase was identified from the genome sequence of the anaerobic thermoalkaliphilic bacterium Anaerobranca gottschalkii. In addition, the homologous gene was isolated from a gene library of Anaerobranca horikoshii and sequenced. The proteins encoded by these two genes showed 39% amino acid sequence identity to the pullulanases from the thermophilic anaerobic bacteria Fervidobacterium pennivorans and Thermotoga maritima. The pullulanase gene from A. gottschalkii (encoding 865 amino acids with a predicted molecular mass of 98 kDa) was cloned and expressed in Escherichia coli strain BL21(DE3) so that the protein did not have the signal peptide. Accordingly, the molecular mass of the purified recombinant pullulanase (rPulAg) was 96 kDa. Pullulan hydrolysis activity was optimal at pH 8.0 and 70°C, and under these physicochemical conditions the half-life of rPulAg was 22 h. By using an alternative expression strategy in E. coli Tuner(DE3)(pLysS), the pullulanase gene from A. gottschalkii, including its signal peptide-encoding sequence, was cloned. In this case, the purified recombinant enzyme was a truncated 70-kDa form (rPulAg′). The N-terminal sequence of purified rPulAg′ was found 252 amino acids downstream from the start site, presumably indicating that there was alternative translation initiation or N-terminal protease cleavage by E. coli. Interestingly, most of the physicochemical properties of rPulAg′ were identical to those of rPulAg. Both enzymes degraded pullulan via an endo-type mechanism, yielding maltotriose as the final product, and hydrolytic activity was also detected with amylopectin, starch, β-limited dextrins, and glycogen but not with amylose. This substrate specificity is typical of type I pullulanases. rPulAg was inhibited by cyclodextrins, whereas addition of mono- or bivalent cations did not have a stimulating effect. In addition, rPulAg′ was stable in the presence of 0.5% sodium dodecyl sulfate, 20% Tween, and 50% Triton X-100. The pullulanase from A. gottschalkii is the first thermoalkalistable type I pullulanase that has been described.

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Diversity and cold-active hydrolytic enzymes of culturable bacteria associated with Arctic sea ice, Spitzbergen.

Groudieva, T., Kambourova, M., Yusef, H., Royter, M., Grote, R., Trinks, H. & Antranikian, G. (2004). Extremophiles, 8(6), 475-488.

The diversity of culturable bacteria associated with sea ice from four permanently cold fjords of Spitzbergen, Arctic Ocean, was investigated. A total of 116 psychrophilic and psychrotolerant strains were isolated under aerobic conditions at 4°C. The isolates were grouped using amplified rDNA restriction analysis fingerprinting and identified by partial sequencing of 16S rRNA gene. The bacterial isolates fell in five phylogenetic groups: subclasses α and γof Proteobacteria, the Bacillus–Clostridium group, the order Actinomycetales, and the Cytophaga–Flexibacter–Bacteroides (CFB) phylum. Over 70% of the isolates were affiliated with the Proteobacteria γ subclass. Based on phylogenetic analysis (<98% sequence similarity), over 40% of Arctic isolates represent potentially novel species or genera. Most of the isolates were psychrotolerant and grew optimally between 20 and 25°C. Only a few strains were psychrophilic, with an optimal growth at 10–15°C. The majority of the bacterial strains were able to secrete a broad range of cold-active hydrolytic enzymes into the medium at a cultivation temperature of 4°C. The isolates that are able to degrade proteins (skim milk, casein), lipids (olive oil), and polysaccharides (starch, pectin) account for, respectively, 56, 31, and 21% of sea-ice and seawater strains. The temperature dependences for enzyme production during growth and enzymatic activity were determined for two selected enzymes, α-amylase and β-galactosidase. Interestingly, high levels of enzyme productions were measured at growth temperatures between 4 and 10°C, and almost no production was detected at higher temperatures (20–30°C). Catalytic activity was detected even below the freezing point of water (at −5°C), demonstrating the unique properties of these enzymes.

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Tenacibaculum skagerrakense sp. nov., a marine bacterium isolated from the pelagic zone in Skagerrak, Denmark.

Frette, L., Jørgensen, N. O. G., Irming, H. & Kroer, N. (2004). International Journal of Systematic and Evolutionary Microbiology, 54(2), 519-524.

A number of bacteria were isolated from sea water in Skagerrak, Denmark, at 30 m depth. Two of the isolates, strains D28 and D30T, belonged to the Flavobacteriaceae within the CytophagaFlavobacteriumBacteroides group. Sequencing of 16S rRNA genes of the two strains indicated strongly that they belonged to the genus Tenacibaculum and that they showed greatest similarity to the species Tenacibaculum amylolyticum and Tenacibaculum mesophilum. DNA–DNA hybridization values, DNA base composition and phenotypic characteristics separated the Skagerrak strains from the other species within Tenacibaculum. Thus, it is concluded that the strains belong to a novel species within the genus Tenacibaculum, for which the name Tenacibaculum skagerrakense sp. nov. is proposed, with strain D30T (=ATCC BAA-458T=DSM 14836T) as the type strain.

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