Skip to Content
Merck
All Photos(1)

Key Documents

View All Documentation

Safety Information

49940

Millipore

ONPG Disks

suitable for microbiology

Synonym(s):

β-Galactosidase Test Disks, 2-Nitrophenyl-β-D-galactopyranoside Disks

Sign Into View Organizational & Contract Pricing
All Photos(1)

About This Item

UNSPSC Code:
41171621
NACRES:
NA.85

Agency

according to GB 4789.4-2016

product line

BioChemika

shelf life

limited shelf life, expiry date on the label

technique(s)

microbe id | specific enzyme detection: suitable

application(s)

environmental
food and beverages
microbiology

shipped in

wet ice

storage temp.

2-8°C

suitability

Escherichia coli
bacteria

General description

ONPG Disks are used to detect the presence of β-galactosidase, an enzyme found in lactose-fermenting organisms. Lactose utilization depends upon two enzymes: β-galactoside permease, which catalyzes transport of lactose into the cell, and β-galactosidase, which breaks down lactose into galactose and glucose. β-Galactosidase is not lactose specific and can act on simple galactosides including the ONPG (o-nitrophenyl-β-D-galactopyranose) substrate. ONPG hydrolysis results in the release of galactose, and the yellow chromogenic compound, o-nitrophenol. The test substrate, ONPG, does not depend on an induced or constitutive permease enzyme to enter the cell, therefore reactions are rapid and occur within a 24-hour period even for late lactose fermenters.

Packaging

Sterile filter paper discs (50 pcs, diameter 6 mm) impregnated with o-nitrophenyl-β-D-galactopyranose

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

JAN Code

49940-50EA-BULK-F:
49940-50DISCS-F:

Choose from one of the most recent versions:

Certificates of Analysis (COA)

Lot/Batch Number
BCCK3268
BCCJ4470
BCCG9930
BCCF6226
BCCD8154

Don't see the Right Version?

If you require a particular version, you can look up a specific certificate by the Lot or Batch number.

Search for a COA

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Leann Clark et al.
Microbiology (Reading, England), 157(Pt 7), 2072-2083 (2011-04-16)
Most studies on Salmonella enterica serovar Typhimurium infection focus on strains ATCC SL1344 or NTCC 12023 (ATCC 14028). We have compared the abilities of these strains to induce membrane ruffles and invade epithelial cells. S. Typhimurium strain 12023 is less

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service