Citric acid monohydrate
Citric acid monohydrate Chemical Properties
- Melting point:
- -94 °C(lit.)
- Boiling point:
- 56 °C760 mm Hg(lit.)
- 0.791 g/mL at 25 °C(lit.)
- vapor density
- 2 (vs air)
- vapor pressure
- 184 mm Hg ( 20 °C)
- refractive index
- Flash point:
- 1 °F
- storage temp.
- Store at RT.
- Citric Acid Monohydrate is very soluble in water, freely soluble in ethanol and sparingly soluble in ether.
- 3.138, 4.76, 6.401
- Specific Gravity
- 0.810 (20/4℃)
- 1.85 (50g/l, H2O, 25℃)
- Water Solubility
- 1630 g/L (20 oC) ;H2O: soluble 54% (w/w) at 10°C (Citric acid in water)
- Stable. Incompatible with oxidizing agents, bases, reducing agents, nitrates.
- CAS DataBase Reference
- 5949-29-1(CAS DataBase Reference)
- NIST Chemistry Reference
- Citric acid monohydrate(5949-29-1)
- EPA Substance Registry System
- 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, hydrate (1:1) (5949-29-1)
Citric acid monohydrate Usage And Synthesis
Citric acid monohydrate occurs as colorless or translucent crystals, or as a white crystalline, efflorescent powder. It is odorless and has a strong acidic taste. The crystal structure is orthorhombic. monohydrate crystals lose water of crystallization in dry air or when heated to about 40 to 50 °C. Citric acid monohydrate softens at 75 °C and melts at approximately 100 °C.
Citric acid monohydrate is a natural preservative and is used to add an acidic, or sour, taste to foods and soft drinks.
Citric acid monohydrate acts as a preservative and antioxidant. It is also used as an acidulant, flavoring agent and antistaling agent in fruit drinks, candy, cookies, biscuits, canned fruits, jams, and jellies. It differs from other forms of citric acid by having a moisture percentage ranging from 7.5-9.0.
Citric Acid Monohydrate is used as an Acidulate, Food additive, Pharmaceutical application and as a synergist in antioxidant mixtures.
Citric Acid Monohydrate is a tricarboxylic acid found in citrus fruits. Citric acid is used as an excipient in pharmaceutical preparations due to its antioxidant properties. It maintains stability of active ingredients and is used as a preservative. It is also used as an acidulant to control pH and acts as an anticoagulant by chelating calcium in blood.
Citric acid occurs naturally in a number of plant species and may be extracted from lemon juice, which contains 5–8% citric acid, or pineapple waste. Anhydrous citric acid may also be produced industrially by mycological fermentation of crude sugar solutions such as molasses, using strains of Aspergillus niger . Citric acid is purified by recrystallization; the anhydrous form is obtained from a hot concentrated aqueous solution and the monohydrate from a cold concentrated aqueous solution.
Citric acid (as either the monohydrate or anhydrous material) is
widely used in pharmaceutical formulations and food products,
primarily to adjust the pH of solutions. It has also been used
experimentally to adjust the pH of tablet matrices in enteric-coated
formulations for colon-specific drug delivery. Citric acid monohydrate
is used in the preparation of effervescent granules, while
anhydrous citric acid is widely used in the preparation of
effervescent tablets. Citric acid has also been shown to improve
the stability of spray-dried insulin powder in inhalation formulations.
In food products, citric acid is used as a flavor enhancer for its tart, acidic taste. Citric acid monohydrate is used as a sequestering agent and antioxidant synergist. It is also a component of anticoagulant citrate solutions. Therapeutically, preparations containing citric acid have been used to dissolve renal calculi.
Citric acid monohydrate was used in the preparation of citric acid solution employed in the acetone method of 68Ga pre-purification and radiolabeling technique.
It may be used:
As release-modifying agent to improve the release of diltiazem hydrochloride from melt extruded Eudragit RS PO tablets.
To prepare citrate buffer for use in the preparation of platelets for intravital microscopy.
To prepare Tris-citrate buffer employed for the electrophoresis of bacterial enzymes.
Citric acid is found naturally in the body, mainly in the bones, and is
commonly consumed as part of a normal diet. Orally ingested citric
acid is absorbed and is generally regarded as a nontoxic material
when used as an excipient. However, excessive or frequent
consumption of citric acid has been associated with erosion of the
Citric acid and citrates also enhance intestinal aluminum absorption in renal patients, which may lead to increased, harmful serum aluminum levels. It has therefore been suggested that patients with renal failure taking aluminum compounds to control phosphate absorption should not be prescribed citric acid or citrate-containing products.
Citric acid monohydrate loses water of crystallization in dry air or when heated to about 408℃. It is slightly deliquescent in moist air. Dilute aqueous solutions of citric acid may ferment on standing.
Crystallise it from hot H2O solution (w/w solubility is 54% at 10o, 71% at 50o and 84% at 100o. The monohydrate (softens at ~75o and melts at ~100o) dehydrates in air or when heated gently above 40o . The triethylester ( M 276.3, b 127o/1mm, 294o/atm, d 4 1.137, n D 1.4420.) is a bitter tasting oil. [Beilstein 3 H 556 and 568, 3 IV 1272.]
Citric acid is incompatible with potassium tartrate, alkali and alkaline earth carbonates and bicarbonates, acetates, and sulfides. Incompatibilities also include oxidizing agents, bases, reducing agents, and nitrates. It is potentially explosive in combination with metal nitrates. On storage, sucrose may crystallize from syrups in the presence of citric acid.
GRAS listed. The anhydrous form is accepted for use as a food additive in Europe. Included in the FDA Inactive Ingredients Database (inhalations; IM, IV, and other injections; ophthalmic preparations; oral capsules, solutions, suspensions and tablets; topical and vaginal preparations). Included in nonparenteral and parenteral medicines licensed in Japan and the UK. Included in the Canadian List of Acceptable Non-medicinal Ingredients.
Citric acid monohydrate Preparation Products And Raw materials
- Sodium benzoate
- DODECAHYDRO DISODIUM HPO4 & CITRIC ACID MONOHYDRATE & SAPONIN
- Calcium citrate
- Citric acid
- Folic acid
- Trisodium citrate dihydrate
- 2-DIETHYLAMINOETHYL 2-PHENYLBUTYRATE CITRATE SALT
- DIETHYLCARBAMAZINE CITRATE
- 2'-CALCIUM CITRATE
- PIPERAZINE CITRATE
- TIN CITRATE
- Acetyl tributyl citrate
- ACETYL TRIALLYL CITRATE
- Citric acid monohydrate
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