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9002-18-0

9002-18-0 Structure

9002-18-0 Structure
IdentificationMore
[Name]

Agar
[CAS]

9002-18-0
[Synonyms]

AGAR-EPI
MACCONKEY AGAR
MACCONKEY AGAR CS
MAC CONKEY AGAR NO 1
MACCONKEY AGAR NO 1, VEGITONE
MACCONKEY AGAR WITH MUG
MACCONKEY AGAR WITHOUT CRYSTAL VIOLET
MACCONKEY BROMOCRESOL PURPLE BROTH
MACCONKEY BROTH PURPLE
MAC CONKEY MUG AGAR
VEGITONE MACCONKEY AGAR NO 1
agaragarflake
agar-agargum
agaropectin,mixtwithagarose
agarose,mixtwithagaropectin
bengal
bengalgelatin
bengalisinglass
ceylon
ceylonisinglass
[EINECS(EC#)]

232-658-1
[Molecular Formula]

(C12H18O9)n
[MDL Number]

MFCD00217113
[MOL File]

9002-18-0.mol
[Molecular Weight]

336.335
Chemical PropertiesBack Directory
[Appearance]

white to pale yellow or tan crystalline powder, no odour
[Melting point ]

85-95 °C
[mp ]

85-95 °C
[FEMA ]

2012
[storage temp. ]

BELOW +15°C
[solubility ]

H2O: 1.5% with heat
[form ]

shredded
[color ]

Brownish yellow
[PH Range]

5 - 7
[PH]

6.5-6.8 (1.5% in gel, after autoclaving)
[Odor]

Odorless
[Stability:]

Stable. Incompatible with strong oxidizing agents.
[Water Solubility ]

SOLUBLE IN HOT WATER
[Sensitive ]

Moisture Sensitive & Hygroscopic
[Merck ]

14,184
[Uses]

Agar is a gum obtained from red seaweeds of the genera gelidium, gracilaria, and eucheuma, class rhodophyceae. it is a mixture of the polysaccharides agarose and agaropectin. it is insoluble in cold water, slowly soluble in hot water, and soluble in boiling water, forming a gel upon cooling. the gels are characterized as being tough and brittle, setting at 32–40°c, and melting at 95°c. a rigid, tough gel can be formed at 0.5%. agar mainly functions in gel for- mation because of its range between melting and setting tempera- tures, being used in piping gels, glazes, icings, dental impression material, and microbiological plating. typical use levels are 0.1–2.0%.
[CAS DataBase Reference]

9002-18-0(CAS DataBase Reference)
[EPA Substance Registry System]

9002-18-0(EPA Substance)
Hazard InformationBack Directory
[Chemical Properties]

white to pale yellow or tan crystalline powder, no odour
[Uses]

Substitute for gelatin, isinglass, etc. in making emulsions including photographic, gels in cosmetics, and as thickening agent in foods especially. confectionaries and dairy products; in meat canning; in production of medicinal encapsulations and ointments; as dental impression mold base; as corrosion inhibitor; sizing for silks and paper; in the dyeing and printing of fabrics and textiles; in adhesives. In nutrient media for bacterial cultures.
[General Description]

Tan powder.
[Reactivity Profile]

Flammable and/or toxic gases are generated by the combination of alcohols with alkali metals, nitrides, and strong reducing agents. They react with oxoacids and carboxylic acids to form esters plus water. Oxidizing agents convert them to aldehydes or ketones. They exhibit both weak acid and weak base behavior.
[Air & Water Reactions]

Water insoluble.
[Fire Hazard]

Flash point data for this chemical are not available. AGAR AGAR is probably combustible.
[Occurrence]

Agar is found in several species of red marine algae in oceans around the world.
[Production Methods]

Agar is obtained by freeze-drying a mucilage derived from Gelidium amansii Lamouroux, other species of the same family (Gelidiaceae), or other red algae (Rhodophyta).
[Definition]

agar: An extract of certain species ofred seaweeds that is used as a gellingagent in microbiological culturemedia, foodstuffs, medicines, andcosmetic creams and jellies. Nutrientagar consists of a broth made frombeef extract or blood that is gelledwith agar and used for the cultivationof bacteria, fungi, and somealgae.
[Agricultural Uses]

Also known as agar, the word agar-agar is of Malaysian origin. It refers to the red seaweeds belonging to genus Eucheuma, used widely in Malaysia for making a gelatinous material.
Agar is a mucilage synthesized by red algae and stored along with cellulose in the cell wall. It is a dry, amorphous and gelatine-like extract, devoid of any nonnitrogenous material from Gelidium and other agarophytes. The extract is the sulphuric acid ester of a linear galactan, soluble in hot water but insoluble in cold water. A 1.5% agar solution can form a firm gel at around 35℃ (with a melting point above 85℃), the gel being a mixture of a partially methylated neutral polysaccharide (agarose) and sulphuric acid ester (agaropectin) of a linear galactan. The gel is made under steam pressure or by boiling, and its agar content depends on the algal species, season and extraction method.
Agar is manufactured from various algae or seaweeds called agarophytes, whereas the term agaroidophyte denotes the red seaweeds that yield a substance chemically akin to an agar-like substance, but with different viscosity and gelling properties. The important agarophytes used for extraction of agar are Acanthopeltis japonica, Ahnfeltia plicata and species under the genera Gelidium, Gracilaria and Rerocladia. Other red algae are Comphylaephora, Eucheuma, Hypnea, Gigartina and Furcellaria.
Different countries use different red algae for making agar. For example, Suhria, Gelidium, Pterocladia, and Ahnfeltia are used in South Africa, the US, New Zealand and Russia respectively. Often, the alga carries the name of that country where it is used. For example, Ceylon agar (or Ceylon moss) refers to the dried red seaweed Gracilaria lichenoides found mainly in Sri Lanka, whereas the same alga found along the Indian coast bordering the Indian Ocean is called Bengal isinglass. Gracilaria verrucosa in China is known as Chinese moss, whereas in Japan, agar-agar made from Gelidium sp. is called Kanten, which means cold sky, because it was made in cold winter days or high up in the mountains.
Agar is used for many purposes - as a solidifying agent in the culture medium used for multiplication of beneficial bacteria like Azotobacter and Azospirillum during biofertilizer production, for algal growth, for canning tuna fish (in Japan), in the sizing of fabrics, etc. Various grades of agar are used as coating material for waterproofing paper and cloth, as a glue, as a cleaning medium for liquids, as a lubricant, in hot drawing of tungsten wire for electrical lamps (for which a suspension of powdered graphite in agar gel is used), for making photographic plates and films, for imparting gloss and stiffness to leather, and as an adhesive in the manufacture of plywood. Agar is even used in food products, for thickening soups, sauces, ice creams, malted milks, jellies, candies and pastries. Due to its high temperature tolerance, agar is fovored in food products. It substitutes pectin for making jellies, jams, marmalades, etc. and serves as a clarifying agent in the manufacture of wine, beer and coffee.
[Pharmaceutical Applications]

Agar is widely used in food applications as a stabilizing agent. In pharmaceutical applications, agar is used in a handful of oral tablet and topical formulations. It has also been investigated in a number of experimental pharmaceutical applications including as a sustained-release agent in gels, beads, microspheres, and tablets.It has also been reported to work as a disintegrant in tablets.
Agar has been used in a floating controlled-release tablet; the buoyancy in part being attributed to air entrapped in the agar gel network.It can be used as a viscosity-increasing agent in aqueous systems. Agar can also be used as a base for nonmelting, and nondisintegrating suppositories.Agar has an application as a suspending agent in pharmaceutical suspensions.
[Safety]

Agar is widely used in food applications and has been used in oral and topical pharmaceutical applications. It is generally regarded as relatively nontoxic and nonirritant when used as an excipient.
LD50 (hamster, oral): 6.1 g/kg
LD50 (mouse, oral): 16.0 g/kg
LD50 (rabbit, oral): 5.8 g/kg
LD50 (rat, oral): 11.0 g/kg
[storage]

Agar solutions are most stable at pH 4–10.
Agar should be stored in a cool, dry, place. Containers of this material may be hazardous when empty since they retain product residues (dust, solids).
[Incompatibilities]

Agar is incompatible with strong oxidizing agents. Agar is dehydrated and precipitated from solution by ethanol (95%). Tannic acid causes precipitation; electrolytes cause partial dehydration and decrease in viscosity of sols.
Safety DataBack Directory
[Hazard Codes ]

Xn
[Risk Statements ]

R22:Harmful if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin .
[Safety Statements ]

S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
S24/25:Avoid contact with skin and eyes .
[WGK Germany ]

2
[RTECS ]

AW7950000
[F ]

3
[TSCA ]

Yes
[HS Code ]

13023100
[Safety Profile]

Mildly toxic by ingestion. When heated to decomposition it emits acrid smoke and fumes.
[Hazardous Substances Data]

9002-18-0(Hazardous Substances Data)
[Toxicity]

LD50 orally in Rabbit: 11000 mg/kg
Raw materials And Preparation ProductsBack Directory
【Raw materials】

L-GALACTOSE
【Preparation Products】

L-Alanine-->Calcium gluconate-->Disodium 5'-Inosinate-->Polyinosinic acid-polycytidylic acid-->Inosine-->Dextran-->Abamectin-->POLYOXIN A-->α-Amylase-->POLYOXIN B-->Gongzhulingmeisu-->LACTICACIDBACTERIA-->hericium erinaceus extract-->Streptodornase/streptokinase-->ASPARAGINASE
Material Safety Data Sheet(MSDS)Back Directory
[msds information]

Gelose(9002-18-0).msds
Questions And AnswerBack Directory
[Description]

Agar is a dried, hydrophilic, colloidal polysaccharide complex extracted from the agarocytes of algae of the Rhodophyceae. The structure is believed to be a complex range of polysaccharide chains having alternating a-(1!3) and b-(1!4) linkages. There are three extremes of structure noted: namely neutral agarose; pyruvated agarose having little sulfation; and a sulfated galactan. Agar can be separated into a natural gelling fraction, agarose, and a sulfated nongelling fraction, agaropectin.
Nutrient Agar
Nutrient Agar
[Chemical Properties]

Agar is produced by some red algae species (Rhodophyceae), especially Gelidium and Gracilaria. Agar contains two polysaccharides - agarose (agaran) and agaropectin. Agarose consists mainly of D-galactose and the 3,6-anhydro form of L-galactose, with small amounts of D-xylose. Some of the D-galactose units are methylated at C-6. The polymer contains alternatingsegments of α(1~3) linked D-galactose units and β (1~4) linked 3,6-anhydro-L-galactose. The main chains of agaropectin are similar, but contain D-glucuronic acid and small amounts of other sugars, including sulphate esters. Agar is not attacked by microorganisms and its strong gel-forming properties make it an ideal matrix for microbial cultures.
[Regulatory Status]

CoE: n/a
FDA: 21 CFR 150 et. seq., 184.1115, 582.7115; 27 CFR 24.243
FDA (other): Approved for OTC use (21 CFR 310.545); HOC (1992)
JECFA: ADI: Not limited (1973)
Well-known Reagent Company Product InformationBack Directory
[Alfa Aesar]

Agar, plant cell culture tested(9002-18-0)
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