dipotassium malate

Dipotassium stoichiometry

Record evidence for the nominal two-potassium-to-one-malate composition and any excess acid or alkali.

1. What measurements identify malate and establish the potassium-to-malate molar ratio? measurement
2. Could the sample instead be potassium hydrogen malate or a mixture of malic acid and potassium salts? boundary

Stereochemical specificity

Keep unspecified, racemic and stereochemically characterized materials distinguishable without creating additional registry entries.

1. Is the malate L, D, racemic or unspecified, and what evidence supports that designation? provenance
2. Do the cited CAS, PubChem and supplier identifiers describe that same stereochemical and hydration scope? boundary

Hydration basis

Distinguish measured total water from an established crystalline hydrate and from solution solvent.

1. Is water present as solvent, adsorbed moisture or an identified hydrate? definition
2. Which water-content and phase measurements support the assigned form? measurement

Salt equivalent accounting

Express assay and solution strength on explicit bases before calculating salt or potassium quantities.

1. Is the reported assay expressed as supplied, on a dry basis or as anhydrous dipotassium malate? measurement
2. What verified concentration, water content and density, if needed, support conversion from supplied quantity to salt equivalents? action

Conditioned solution properties

Keep measured solution properties separate from nominal salt stoichiometry and from assumptions about malate protonation in solution.

1. What solubility and pH are measured at the stated temperature, concentration and solvent composition? measurement
2. Does observed pH require investigation of residual malic acid, excess alkali or other formulation components? action

Form-dependent stability

Require evidence before assigning thermal constants or interpreting moisture uptake, precipitation or discoloration.

1. Does an observed thermal event represent dehydration, melting or decomposition, and for which characterized form? measurement
2. Which documented storage limits and observed changes require re-assay or quarantine? action

Residuals and contaminants

Select impurity measurements using the claimed grade and production evidence rather than assuming a universal impurity profile.

1. What limits and results cover residual malic acid, excess alkali, other cations and relevant trace contaminants? measurement
2. Which production or supplier records justify the selected impurity panel? provenance

Representative batch evidence

Track batch identity, sampling and methods so a certificate cannot silently substitute for evidence about a different lot or physical form.

1. Which batch, sampling date and analytical methods support the certificate of analysis? provenance
2. Can the methods distinguish dipotassium malate from related malates and quantify the specified impurities at their limits? measurement

E351 scope

EFSA identifies E351 potassium malate as dipotassium DL-malate; apply that correspondence only with the relevant stereochemical and specification evidence. [EFSA](https://www.efsa.europa.eu/en/call/call-data-re-evaluation-malic-acid-and-malates-e-296-e-350-352-food-additives)

1. Does this batch match the chemical identity, stereochemical scope and purity requirements of the applicable additive specification? boundary
2. Which current jurisdiction-specific provisions cover the proposed food category and use level? action

Presentation-specific safety

Record a current safety data sheet and its classification basis for the actual solid or solution rather than inferring safety from the substance name.

1. What classification and handling instructions does the current safety data sheet give for this composition and jurisdiction? provenance
2. What controls are required for the actual operation, including dust generation, solution splashes or heating? action

Check these first

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these check these first hold for the sense of dipotassium malate this model covers, and on what evidence? provenance

Kinds and varieties

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these kinds and varieties hold for the sense of dipotassium malate this model covers, and on what evidence? provenance

Identifiers and schemes

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these identifiers and schemes hold for the sense of dipotassium malate this model covers, and on what evidence? provenance

Real-world use

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these real-world use hold for the sense of dipotassium malate this model covers, and on what evidence? provenance

Typical measurements

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these typical measurements hold for the sense of dipotassium malate this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of dipotassium malate this model covers, and on what evidence? provenance