Calcium Citrate Tetrahydrate Identity and Sourcing (CAS 5785-44-4)
Calcium Citrate Tetrahydrate (CAS 5785-44-4), also called tricalcium dicitrate tetrahydrate, is a hydrated calcium salt of citric acid. PubChem records the formula C12H18Ca3O18 and molecular weight 570.5 g/mol. Buyers should state the CAS record, tetrahydrate form, assay basis, intended application and destination-market standard before comparing specifications or quotations.
Calcium Citrate Tetrahydrate identity at a glance
| Primary name | Calcium Citrate Tetrahydrate |
|---|---|
| Other name | Tricalcium dicitrate tetrahydrate; calcium citrate tribasic tetrahydrate |
| CAS Registry Number | 5785-44-4 |
| EC number | 629-915-9 |
| Formula | C12H18Ca3O18, also expressed as Ca3(C6H5O7)2·4H2O |
| Molekulargewicht | 570.5 g/mol (PubChem; regulatory specifications commonly show 570.51) |
| InChIKey | LNIZKKFWMDARJV-UHFFFAOYSA-H |
| Machine-readable structure | C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])O.C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])O.O.O.O.O.[Ca+2].[Ca+2].[Ca+2] |
Identity references: PubChem CID 5282392 und ECHA substance information.
What is the formula of CAS 5785-44-4?
The tetrahydrate formula is C12H18Ca3O18. It represents three calcium ions, two citrate units and four waters of hydration. The water is part of the stated formula; omitting it changes the molecular weight and the interpretation of assay, loss-on-drying and elemental-calcium calculations.
The formula-derived theoretical calcium fraction is approximately 21.1%: three calcium atoms contribute about 120.234 g per 570.5 g formula unit. This is a stoichiometric calculation, not a current Longchang specification, guaranteed assay or lot result.
CAS 5785-44-4 versus CAS 813-94-5
PubChem records CAS 5785-44-4 as Calcium Citrate Tetrahydrate with molecular weight 570.5 g/mol. Its CAS 813-94-5 record is a separate tricalcium dicitrate identity with formula C12H10Ca3O14 and molecular weight 498.4 g/mol. These records should not be substituted in a purchase order without confirming the requested identity, hydration state, formula basis and analytical specification.
| Identity question | CAS 5785-44-4 record | CAS 813-94-5 record | Buyer action |
|---|---|---|---|
| Name | Calcium Citrate Tetrahydrate | Calcium Citrate / tricalcium dicitrate | State the controlled name and CAS on the RFQ |
| Formula / molecular weight | C12H18Ca3O18 / 570.5 | C12H10Ca3O14 / 498.4 | Match calculations to the required form |
| Water context | Four waters stated in the identity | Hydration must be defined by the applicable specification | Request the method, conditions and reporting basis |
| Regulatory context | CAS identity alone does not prove a grade | EU/JECFA/U.S. food records commonly cite 813-94-5 while describing tetrahydrate | Name the exact jurisdiction and monograph |
E333 and food-regulatory boundary
The EU E333 family includes mono-, di- and tricalcium citrate. E333(iii) is tricalcium citrate, and the EU specification describes the tetrahydrated salt with molecular weight 570.51. JECFA identifies Calcium Citrate as INS 333 and lists acidity-regulator, firming-agent and sequestrant functions. U.S. 21 CFR 184.1195 also describes calcium citrate with four moles of water.
Those sources do not prove that an unspecified CAS 5785-44-4 lot complies with E333, JECFA, Food Chemicals Codex, a buyer standard or a destination-market rule. The regulatory records commonly cite CAS 813-94-5 while describing the tetrahydrate. Qualification must therefore match the exact identity, current specification, methods, impurity limits, intended technical function, food category and market.
Regulatory references: EU Regulation 231/2012, JECFA Calcium Citrate, FAO specification und 21 CFR 184.1195.
Reference properties are not a supplier specification
The FAO specification describes Calcium Citrate as an odorless fine white powder that is very slightly soluble in water and insoluble in ethanol. These reference descriptions help identify a material, but they do not replace an approved supplier specification or demonstrate the performance of a current lot in a buyer’s formulation.
Every comparison should use the same identity, hydration state and calculation basis. A percentage without a method or basis cannot establish whether two offers are equivalent.
Legacy source-record fields requiring confirmation
The historical Longchang product record displayed the fields below without a visible current specification number, complete method set, lot identity, effective date or approval status. They are retained only as RFQ questions—not as current limits, lot results, grade claims, packaging commitments or regulatory evidence.
| Historical field | Old page value | Required current confirmation |
|---|---|---|
| Erscheinungsbild | Weißes Pulver | Controlled description, identity tests and acceptance criteria |
| Assay | 97.5–100.5% | Method, hydration/drying basis, current range and applicable lot result |
| Verlust beim Trocknen | 10.0–13.3% | Method, temperature/time, basis and current limit |
| Arsenic / lead / fluoride / heavy metals | Old individual limits | Current methods, units, jurisdiction/buyer limits and lot results |
| Acid-insoluble matter | ≤0.20% | Current method, units, limit and applicable lot result |
| Mikrobiologie | Old TPC, yeast/mold and named-organism fields | Current applicability, methods, sampling plan, limits and lot results |
| Verpackung | 25 kg/Trommel | Current pack size, construction, lining, closure, pallet and destination requirements |
Calcium Citrate Tetrahydrate sourcing checklist
- Confirm Calcium Citrate Tetrahydrate, CAS 5785-44-4, formula and requested basis.
- Define the intended technical function, process and destination market.
- Provide the buyer specification or list required tests, methods, units and limits.
- Request the current supplier specification, applicable lot COA and current SDS.
- State any E333, JECFA, compendial, customer or market-specific document requirement.
- State sample need, quantity, packaging constraints, destination and requested delivery window.
- Qualify the sample in the buyer’s process and quality system before scale-up.
Request current CAS 5785-44-4 information
Open the Calcium Citrate Tetrahydrate CAS 5785-44-4 sourcing page to request current specification, analytical methods, lot COA, SDS, sample and commercial information.
E-Mail info@longchangchemical.com with the form, application, destination market, target tests/limits, quantity, packaging and document requirements.
Frequently asked questions
What is the formula of Calcium Citrate Tetrahydrate?
The formula is C12H18Ca3O18, commonly written Ca3(C6H5O7)2·4H2O.
What is the molecular weight of CAS 5785-44-4?
PubChem reports 570.5 g/mol. Food-additive specifications commonly display 570.51 g/mol for the tetrahydrate formula.
How much theoretical calcium is in the tetrahydrate formula?
The formula-derived mass fraction is approximately 21.1% calcium. A current product assay still requires an approved method, basis and lot result.
Does CAS 5785-44-4 prove E333 or food-grade compliance?
No. CAS identifies a substance record. Regulatory and grade suitability require the exact applicable standard, current controlled documents, manufacturing evidence and buyer approval.
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