Skip to Content
Merck
All Photos(1)

Documents

60983

Millipore

Kovac′s reagent for indoles

suitable for microbiology

Synonym(s):

4-(Dimethylamino)benzaldehyde solution, Indole reagent according to Kovac

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

About This Item

Empirical Formula (Hill Notation):
C9H11NO
CAS Number:
100-10-7
Molecular Weight:
149.19
Beilstein:
4132845
MDL number:
MFCD00003381
UNSPSC Code:
41171621
PubChem Substance ID:
329759335
NACRES:
NA.85

shelf life

limited shelf life, expiry date on the label

Quality Level

100

composition

n-butanol
4-dimethylaminobenzaldehyde
hydrochloric acid

technique(s)

microbe id | specific enzyme detection: suitable

refractive index

n20/D 1.400-1.420

application(s)

agriculture
clinical testing
environmental
food and beverages
microbiology

storage temp.

2-8°C

suitability

Escherichia coli
coliforms

SMILES string

[H]C(=O)c1ccc(cc1)N(C)C

InChI

1S/C9H11NO/c1-10(2)9-5-3-8(7-11)4-6-9/h3-7H,1-2H3

InChI key

BGNGWHSBYQYVRX-UHFFFAOYSA-N

Looking for similar products? Visit Product Comparison Guide

General description

Kovac′s reagent for indoles is a solution of 4-(dimethylamino)benzaldehyde and hydrochloric acid in n-butanol.

Application

Kovac′s reagent for indoles has been used for enumerating E. coli O157:H7 in ground beef samples in different scenarios of stored, thawed, and as cooked patty samples. It has also been used for E coli enumeration in dewatered blackwater.

Biochem/physiol Actions

Kovac′s reagent detects the indole and aids in identifying the indole-positive and indole-negative microorganisms. E. coli can split tryptophan into indole and α-aminopropionic acid in the presence of the enzyme tryptophanase. p-Aminobenzaldehyde present in the reagent reacts with indole to form a cherry-red complex, that is soluble in alcohol, ether, and chloroform. It is recommended to use glucose free media and peptone with a high tryptophan content for the test.

Signal Word

Danger

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Flam. Liq. 3 - Met. Corr. 1 - Skin Irrit. 2 - STOT SE 3

Target Organs

Central nervous system, Respiratory system

Storage Class Code

3 - Flammable liquids

WGK

WGK 1

Flash Point(F)

96.8 °F

Flash Point(C)

36 °C

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.

EU REACH Annex XVII (Restriction List)

CAS No.

Choose from one of the most recent versions:

Certificates of Analysis (COA)

Lot/Batch Number
BCCL0925
BCCK8015
BCCM2245
BCCJ6939
BCCG3903

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

Ragnhildur Gunnarsdóttir et al.
Environmental science & technology, 46(22), 12408-12416 (2012-11-02)
Wastewater treatment in many Arctic regions is inadequate, even nonexisting. Natural freezing of wastewater in those areas may be beneficial for reduction of microorganisms. The aim of this study was to investigate the effect of long-term freezing, and repeated freezing
Stavros G Manios et al.
Meat science, 101, 25-32 (2014-12-03)
The effect of common handling practices (i.e., freezing, thawing and cooking) of beef patties on the survival of Salmonella spp. and Escherichia coli O157:H7, was evaluated. Inoculated ground beef was stored at -22 °C for 5 and 75 days. After
G L Lombard et al.
Journal of clinical microbiology, 18(3), 609-613 (1983-09-01)
Three reagents for detecting indole, Kovac, Ehrlich, and p-dimethylaminocinnamaldehyde (DMCA), were evaluated with commercial microtest systems for characterizing and identifying anaerobic bacteria. The DMCA reagent, the most sensitive of the three reagents, gave a positive reaction with 445 of 449
Jun-Min Guo et al.
Journal of agricultural and food chemistry, 58(11), 6556-6561 (2010-05-15)
A simple colorimetric method for the differentiation of indoleacetic acid (IAA) and indolebutyric acid (IBA) in plant samples is described. The color change is based upon the reaction between the auxins and p-(dimethylamino)benzaldehyde (PDAB, Ehrlich reagent) following the electrophilic substitution
Spectrophotometric determination of certain cephalosporins through oxidation with cerium(IV) and 1-chlorobenzotriazole.
M M Ayad et al.
Journal of pharmaceutical and biomedical analysis, 20(3), 557-564 (2000-03-04)
View All Related Papers

Articles

Differentiation of Escherichia coli from coliforms

There are many other methods of detection to indicate the presence of E. coli. Review common tests and biochemical reactions for this contaminant.

Identification of Microorganisms Based on Color

For microbiologists the most fundamental stain was developed in 1884 by the Danish bacteriologist Hans Christian Gram.

Detection, Identification and Differentiation of Clostridium perfringens

Clostridium perfringens can cause contamination in undercooked or improperly sterilized canned foods and water. Learn to detect, identify, and differentiate this pathogen.

Pseudomonas Media and Tests

An article concerning the detection, identification, differentiation, and cultivation of Pseudomonas species.

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