CO00016 Midstream Cassette 140x15mm, blue w/lens

200 µL filtered pipette tips for the Opentrons Flex, provided sterile in racks or blister packs (refills). Tips are clear, non-conducting polypropylene tips, free of human DNA, PCR inhibitors, RNase/DNase, pyrogens, and endotoxins. Opentrons Flex Tips and Racks are autoclavable.

200 µL filtered pipette tips for the Opentrons Flex, provided sterile in racks or blister packs (refills). Tips are clear, non-conducting polypropylene tips, free of human DNA, PCR inhibitors, RNase/DNase, pyrogens, and endotoxins. Opentrons Flex Tips and Racks are autoclavable.

Bis-Sulfone-PEG9-DBCO is a bis-alkylating labeling reagent that is selective for the cysteine sulfur atoms from a native disulfide. These reagents undergo bis-alkylation to conjugate both thiols derived from the two cysteine residues of a reduced native disulfide bond such as the interchain disulfide bonds of an antibody. The reaction results in covalent rebridging of the disulfide bond via a three carbon bridge leaving the protein structurally intact. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.

Bis-Sulfone-PEG9-DBCO is a bis-alkylating labeling reagent that is selective for the cysteine sulfur atoms from a native disulfide. These reagents undergo bis-alkylation to conjugate both thiols derived from the two cysteine residues of a reduced native disulfide bond such as the interchain disulfide bonds of an antibody. The reaction results in covalent rebridging of the disulfide bond via a three carbon bridge leaving the protein structurally intact. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.

K-CellG5-4V

SKU: 700004272

The K-CellG5-2V pack size has been discontinued (read more).

Cellulase Activity Assay Kit.

The CellG5 assay reagent for the measurement of endo-cellulase (endo-1,4-β-glucanase) contains two components; 1) 4,6-O-(3-Ketobutylidene)-4-nitrophenyl-β-D-cellopentaoside (BPNPG5) and 2) thermostable β-glucosidase. The ketone blocking group prevents any hydrolytic action by the β-glucosidase on BPNPG5.  Incubation with an endo-cellulase generates a non-blocked colourimetric oligosaccharide that is rapidly hydrolysed by the ancillary β-glucosidase. The rate of formation of 4-nitrophenol is therefore directly related to the hydrolysis of BPNPG5 by the endo-cellulase. The reaction is terminated and the phenolate colour is developed on addition of Tris buffer solution (pH 9.0).

The CellG5 assay represents a huge step forward in the methodology for the measurement of cellulase that traditionally relied on substrates such as CM-cellulose, Avicel, cellooligosaccharides, filter paper or dyed polysaccharides including CMC Congo red or cellulose azure.

View Cellulase Activity Assay Protocol.

View our complete list of assay kits for enzyme activities.

The CellG5 assay reagent for the measurement of endo-cellulase (endo-1,4-β-glucanase) contains two components; 1) 4,6-O-(3-Ketobutylidene)-4-nitrophenyl-β-D-cellopentaoside (BPNPG5) and 2) thermostable β-glucosidase. The ketone blocking group prevents any hydrolytic action by the β-glucosidase on BPNPG5. Incubation with an endo-cellulase generates a non-blocked colourimetric oligosaccharide that is rapidly hydrolysed by the ancillary β-glucosidase. The rate of formation of 4-nitrophenol is therefore directly related to the hydrolysis of BPNPG5 by the endo-cellulase. The reaction is terminated and the phenolate colour is developed on addition of Tris buffer solution (pH 9.0).