56763
Agar
high purity, low ionic content, low gel strenght, suitable for microbiology
Synonym(s):
Agar-agar, Gum agar, Agar-agar, Gum agar
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About This Item
Linear Formula:
(C12H18O9)n
CAS Number:
UNSPSC Code:
41106212
NACRES:
NA.85
EC Number:
232-658-1
MDL number:
Quality Segment
sterility
non-sterile
form
powder
shelf life
limited shelf life, expiry date on the label
ign. residue
≤4.0%
loss
≤10% loss on drying
turbidity
≤8 NTU (after autoclaving)
mp
85-95 °C
transition temp
gel point 34-36 °C
gel strength
≥800 g/cm2
anion traces
sulfate (SO42-): ≤2.75%
cation traces
Ca: ≤500 mg/kg, Mg: ≤200 mg/kg
application(s)
microbiology
SMILES string
O1[C@@H]([C@@H]([C@@H]([C@H](C1OC2[C@H]3OCC2OC([C@H]3O)C)O)OC)O)CO
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
InChI key
GYYDPBCUIJTIBM-DYOGSRDZSA-N
General description
Agar is of high purity, low ionic content, and low gel strength 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, which facilitates the formation of distinct colonies and selective isolation of specific microorganisms. Agar is also used in the preparation of 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 dishes, where it can cool and solidify, forming the surface for microbial growth.
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, food and beverage samples.
Analysis Note
toxic substances: absence
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Storage Class
11 - Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
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