68-04-2 Usage
Description
Sodium citrate, also known as citrate of soda, is a white crystalline powder or granular substance obtained by neutralizing citric acid with sodium carbonate. It is soluble in water but less soluble in alcohol. Sodium citrate may refer to any of the sodium salts of citric acid, with the most common being trisodium citrate (Na3C6H5O7), which has a saline, mildly tart flavor. As a food additive, the three forms of the salt are collectively known by the E number E331.
Uses
Used in Pharmaceutical Industry:
Sodium citrate is used as an alkalizer (systemic) for medical purposes.
Used in Cosmetic Industry:
Sodium citrate is used as an alkalizer and to bind trace metals in cosmetic formulations by means of a chelating action.
Used in Food Industry:
Sodium citrate is used as a buffer in carbonated beverages and to control pH in preserves. It improves the whipping properties in cream, prevents feathering of cream and nondairy coffee whiteners, provides emulsification, and solubilizes protein in processed cheese. It also prevents precipitation of solids during storage in evaporated milk, improves rehydration in dry soups, and functions as a sequestrant in puddings. Additionally, it acts as a complexing agent for iron, calcium, magnesium, and aluminum, with typical usage levels ranging from 0.10 to 0.25%.
Used in Paper Industry:
Sodium citrate was used as a preservative in albumen papers.
Preparation
Produced by the neutralization of citric acid with sodium hydroxide or sodium carbonate. May be prepared in an anhydrous state or may contain 2 mole of water per mole of sodium citrate.
Biochem/physiol Actions
Citrate Concentrated Solution or sodium citrate is an anticoagulant used for collecting blood samples. It is useful in coagulation testing and for the erythrocyte sedimentation rate. Sodium citrate eliminates calcium, which is known to mediate coagulation.
Food additive
Sodium citrate is some times used as an acidity regulator in drinks, and also as an emulsifier for oils when making cheese. It allows the cheeses to melt with out becoming greasy. Consider the following quote from Modernist Cuisine: Our modernist version of mac and cheese owes its chemistry to James L. Kraft, who in 1916 patented the first American cheese slice. He showed that sodium phosphate keeps the water and fat droplets mixed when the cheese is melted. We use sodium citrate, which has the same effect and is easier to find. The resulting texture is as smooth as melted American cheese, but as complex and intense in flavor as any of your favorite cheeses.
Purification Methods
Crystallise the salt from warm water by cooling to 0o. [Beilstein 3 III 1100, 3 IV 1274.]
Check Digit Verification of cas no
The CAS Registry Mumber 68-04-2 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 6 and 8 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 68-04:
(4*6)+(3*8)+(2*0)+(1*4)=52
52 % 10 = 2
So 68-04-2 is a valid CAS Registry Number.
InChI:InChI=1/C6H8O7.3Na/c7-3(8)1-6(13,5(11)12)2-4(9)10;;;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);;;/q;3*+1/p-3
68-04-2Relevant articles and documents
Richards, T. W.,Mair, B. J.
, p. 740 - 748 (1929)
CO-PRECIPITATED SALTS OF FATTY ACIDS
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, (2011/10/12)
A co-salt of a polyunsaturated fatty acid and a non-fatty acid is formed as a precipitate. The co-salt formed is free flowing and does not tend to agglomerate (cake) in storage. The resultant co-salt product will be easy to blend with other products to produce dietary supplements. These novel co-salt products may also tablet very well and may be added to current dietary supplement tablets.
DIALYSIS SOLUTIONS CONTAINING PYROPHOSPHATES
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, (2009/04/24)
Dialysis solutions comprising pyrophosphates and methods of making and using the dialysis solutions are provided. In an embodiment, the present disclosure provides a dialysis solution comprising a stable and therapeutically effective amount of pyrophosphate. The dialysis solution can be sterilized, for example, using a technique such as autoclave, steam, high pressure, ultra-violet, filtration or combination thereof. The dialysis solution can be in the form of a concentrate.
