56763

Agar

high purity, low ionic content, low gel strenght, suitable for microbiology

• Synonym(s): Agar-agar, Gum agar, Agar-agar, Gum agar
• Linear Formula: (C₁₂H₁₈O₉)_n
• CAS Number: 9002-18-0
• EC Number: 232-658-1
• MDL number: MFCD00081288
• UNSPSC Code: 41106212
• NACRES: NA.85

Properties

• Quality Level: 200
• 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 (SO₄^2-): ≤2.75%
• cation traces: Ca: ≤500 mg/kg; Mg: ≤200 mg/kg
• application(s): microbiology
• 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

Description

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

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable