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Kovac′s reagent for indoles

suitable for microbiology

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Synonym(s):
4-(Dimethylamino)benzaldehyde solution, Indole reagent according to Kovac
Empirical Formula (Hill Notation):
C9H11NO
CAS Number:
Molecular Weight:
149.19
Beilstein:
4132845
MDL number:
PubChem Substance ID:
NACRES:
NA.85

shelf life

limited shelf life, expiry date on the label

Quality Level

composition

n-butanol
4-dimethylaminobenzaldehyde
hydrochloric acid

technique(s)

microbe id | specific enzyme detection: suitable

refractive index

n20/D 1.417

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

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1 of 4

This Item
673091.0929378719
Millipore

Millipore

1.09293

KOVACS′ indole reagent

Millipore

Millipore

78719

Kovac′s Reagent Strips

storage temp.

2-8°C

storage temp.

2-8°C

storage temp.

2-8°C

storage temp.

2-8°C

Quality Level

100

Quality Level

200

Quality Level

200

Quality Level

-

shelf life

limited shelf life, expiry date on the label

shelf life

limited shelf life, expiry date on the label

shelf life

-

shelf life

limited shelf life, expiry date on the label

composition

n-butanol

composition

4-(dimethlyamino)benzaldehyde, 50 g/L , hydrochloric acid, 240 g/L , isoamylic alcohol, 710 g/L

composition

-

composition

-

technique(s)

microbe id | specific enzyme detection: suitable

technique(s)

microbe id | specific enzyme detection: suitable

technique(s)

microbe id | specific enzyme detection: suitable

technique(s)

microbe id | specific enzyme detection: suitable

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

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

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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
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
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
G P Kushto et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 54A(6), 799-819 (1998-07-17)
Results of a normal coordinate analysis based on infrared and Raman spectra of six isotopic forms of 4-(dimethylamino)benzaldehyde are reported (DABA, DABA-CDO, DABA-13CDO, DABA-13CHO, DABA-CHO18O, and DABA-3,5-D). Cs point group symmetry has been applied and all motions except the internal

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