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Merck

05039

Agar

suitable for microbiology

Synonym(s):

Agar-agar, Gum agar

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About This Item

Linear Formula:
(C12H18O9)n
CAS Number:
9002-18-0
eCl@ss:
42040102
UNSPSC Code:
41106212
NACRES:
NA.74
EC Number:
232-658-1
MDL number:
MFCD00081288

Key Documents

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Product Name

Agar, suitable for microbiology

InChI key

GYYDPBCUIJTIBM-DYOGSRDZSA-N

InChI

1S/C14H24O9/c1-5-8(16)13-11(7(21-5)4-20-13)23-14-10(18)12(19-2)9(17)6(3-15)22-14/h5-18H,3-4H2,1-2H3/t5?,6-,7?,8-,9+,10-,11?,12+,13+,14?/m1/s1

sterility

non-sterile

form

powder

shelf life

limited shelf life, expiry date on the label

packaging

pkg of 50 g
pkg of 500 g

storage condition

(Tightly closed)

ign. residue

≤5%

loss

≤12% loss on drying

pH

6-7.5 (1.5%after autoclaving)

mp

85-95 °C

transition temp

gel point 33-37 °C (1.5% solution, after autoclaving)

gel strength

>800 g/cm2 (1.5% gel, Nikkan, after autoclaving)

solubility

H2O: 1.5% at 70 °C, clear to very faintly turbid, almost colorless

application(s)

agriculture
microbiology

Quality Level

100

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Application

Agar is commonly used as a solidifying agent in many microbial culture media for the growth and identification of bacteria, yeasts, and molds from various pharmaceutical, environmental, and food and beverage samples.

General description

Agar is widely used in microbiology as a solidifying agent in microbial culture media. It is a polysaccharide derived from seaweed and is primarily composed of agarose. Agar is a mostly inert substance, which makes it an ideal material for microbial culture media because it doesn’t interfere with the growth of microorganisms. Agar can solidify media, allowing microorganisms to grow in a solid environment, facilitating the formation of distinct colonies and selective isolation of specific microorganism. Agar is also used to prepare selective and differential media, which can provide additional nutrients or other chemical substances to promote or inhibit the growth of specific microorganisms selectively. Agar is sterilized by autoclaving and then poured into Petri dishesto cool and solidify, forming the surface for microbial growth.

Storage Class

11 - Combustible Solids

wgk

WGK 1

ppe

Eyeshields, Gloves, type N95 (US)

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.

05039-50G: + 05039-100G: + 05039-6X500G: + 05039-VAR: + 05039-5KG: + 05039-500G: + 05039-BULK:

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Certificates of Analysis (COA)

Lot/Batch Number
BCCN9720
BCCN3768
BCCM4620
BCCL4011
BCCK2664

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Developmentally and stress-induced small heat shock proteins in cork oak somatic embryos.
Puigderrajols P1, Jofre A, Mir G, Pla M, Verdaguer D, Huguet G, Molinas M
Journal of Experimental Botany, 53 (373), 1445-1452 (2002)
AGAR SUSPENSION CULTURE FOR THE SELECTIVE ASSAY OF CELLS TRANSFORMED BY POLYOMA VIRUS.
MACPHERSON I, MONTAGNIER L
Virology, 291-294 (1964)
Hijacking membrane transporters for arsenic phytoextraction.
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Journal of Biotechnology, 163 (1), 1-9 (2013)
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Articles

Base Ingredients of Microbiology Media

Culture media provides a habitat with suitable nutrients, energy sources, and certain environmental conditions for the growth of microorganisms. The components of the culture media range from simple sugars to peptones, salts, antibiotics, and complex indicators.

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