Food phosphate · Potassium salt · INS 450(v)
Source food grade TKPP when a formulation needs alkaline pyrophosphate functionality with potassium instead of a sodium pyrophosphate. Compare solution pH, mineral load, protein or cheese performance and destination-market rules before approval.
Include quantity, destination, application and required compliance documents for a useful quotation.
Product overview
Tetrapotassium pyrophosphate (TKPP), also called tetrapotassium diphosphate or potassium pyrophosphate, is the potassium salt of pyrophosphoric acid. Its chemical formula is K4P2O7, its CAS number is 7320-34-5, and its international food additive designation is INS 450(v).
TKPP is hygroscopic and highly soluble in water. Its combination of alkalinity, phosphate functionality and metal-ion binding makes it useful in carefully designed food-processing systems. The appropriate dosage and legal use must be determined for the specific food category and destination market.
Potassium-based phosphate decision
TKPP is not simply a premium substitute for every sodium phosphate. Its value must be tested against the sodium target, potassium contribution, required pyrophosphate function, solution behavior and finished-food performance.
TKPP does not add sodium from the phosphate salt itself, so it may be screened against TSPP in sodium-reduction work. This does not make the finished food “low sodium”; calculate every sodium source and verify the legal claim criteria.
Pure anhydrous K4P2O7 is theoretically about 47.4% potassium by mass. Use the offered grade's certified composition for formulation and nutrition calculations.
JECFA specifies pH 10.0–10.7 for a 1% solution. Excessive or poorly balanced use can change finished pH, flavor, color and protein texture.
Although TKPP is water-soluble, practical dissolution depends on concentration, temperature, water hardness, agitation, salt content and ingredient order. Check clarity and sediment in the actual brine or process water.
Claim boundary: replacing a sodium phosphate with TKPP can reduce sodium contributed by that ingredient, but nutritional claims require a calculation for the complete finished food and the destination market.
Functional roles
JECFA identifies TKPP as an emulsifier and texturizer. In applied systems, its alkaline pyrophosphate ion can also influence mineral–protein interactions; performance must be demonstrated in the complete formula.
Pyrophosphate can interact with polyvalent ions while TKPP raises solution pH. This may change protein hydration or emulsion behavior, but excessive alkalinity can create sensory and texture defects.
In suitable meat or cheese systems, an alkaline phosphate system can support protein hydration and fat–water stabilization. Raw material, salt, shear, temperature and total phosphate determine the result.
Food industry uses
These are qualification pathways rather than universal permissions or dosage recommendations. The strongest technical fit is where potassium-based pyrophosphate functionality is deliberately required.
Compare TKPP within a phosphate system when sodium contribution, protein extraction, water binding or emulsion stability is under review. Record brine clarity, pickup, cook loss, chilled purge, texture and sensory quality.
Screen calcium sequestration, casein hydration and fat–water emulsification. Control natural-cheese composition, calcium, moisture, pH, heating, shear and cooling before judging slice or spread texture.
Where permitted, compare TKPP or a phosphate blend for solution behavior and retained yield. Report pickup after equal drainage, thaw/cook loss, texture and phosphate labeling rather than pickup alone.
Use TKPP as one component only when its alkalinity and pyrophosphate functionality help meet a defined sodium, solubility or performance target. Validate blend compatibility and storage stability.
Technical information
The following values reproduce the supplied Bespring specification sheet for initial procurement review. They are not a batch COA or a statement of conformity to every international compendium. Confirm the current signed specification and test methods before ordering.
| Test item | Unit | Supplied limit | Qualification note |
|---|---|---|---|
| K₄P₂O₇ content | % | ≥ 95.0 | Confirm ignited-basis assay |
| Water-insoluble matter | % | ≤ 0.2 | Matches JECFA maximum |
| Arsenic (As) | mg/kg | ≤ 3 | Matches JECFA; EU limit is lower |
| Heavy metals (as Pb) | mg/kg | ≤ 10 | Not the same test as lead |
| Lead (Pb) | mg/kg | ≤ 2 | Stricter than JECFA 4 mg/kg; EU limit is lower |
| Fluoride (F) | mg/kg | ≤ 30 | Does not match JECFA/EU 10 mg/kg |
| “Loss on ignition at 110°C” | % | ≤ 0.5 | Source label/method is ambiguous; JECFA LOI uses two heating stages |
| Cadmium (Cd) | mg/kg | ≤ 1 | Supplied commercial parameter |
| Mercury (Hg) | mg/kg | ≤ 1 | Supplied commercial parameter |
| Appearance | — | White powder or granules | JECFA: crystals or crystalline/granular powder |
Specification decision: The supplied fluoride limit of 30 mg/kg does not meet the current JECFA or EU 10 mg/kg limit. The arsenic and lead limits also differ from current EU limits. Do not claim JECFA or EU conformity until the exact offered grade and COA meet the selected standard.
JECFA lists INS 450(v), CAS 7320-34-5, formula K4P2O7, molecular weight 330.34, assay ≥95% on the ignited basis and pH 10.0–10.7 for a 1% solution.
Review the JECFA monographEU E450(v) includes P2O5 42.0–43.7% on the anhydrous basis and tighter arsenic and lead limits than the supplied table. Regulatory fit must be checked for the destination.
Review Regulation (EU) No 231/2012Avoid phosphate-name confusion
These materials are not interchangeable by acronym or equal weight. Compare the ion, phosphate chain, alkalinity, solubility, legal identity and validated function.
K4P2O7 · INS 450(v)
Potassium pyrophosphate; consider when potassium-based, alkaline pyrophosphate functionality is required.
Na4P2O7 · INS 450(iii)
Sodium pyrophosphate; compare sodium contribution, practical dissolution and equivalent functional performance.
Review food grade TSPPK5P3O10
Potassium tripolyphosphate has a different phosphate chain and specification. Do not treat the similar abbreviation as the same ingredient.
Review food grade KTPPQualification support
Certificates and management-system documents are time-sensitive. Ask for current, applicable copies and verify the product name, site, scope, issuer and validity dates during supplier qualification.
Current specification, technical data sheet, safety data sheet and a representative or batch-specific certificate of analysis.
Request the HACCP, Kosher and Halal documents applicable to the offered product and production or packing site.
Request the current ISO certificate and scope, together with traceability or quality questionnaires required by your approval process.
Storage & handling
Appearance and handling references
Application approval
A potassium-phosphate substitution should be approved from measured product and process results, not only a nutrition calculation.
Record current phosphate, sodium and potassium sources, water chemistry, formula pH, process loss and target claim.
Add TKPP gradually under agitation and record temperature, concentration, ingredient order, dissolution time, clarity and sediment.
Hold raw material, salt, water, shear, temperature, processing and sampling constant against the approved control.
Assess finished pH, sodium/potassium calculation, yield, purge, emulsion or texture, flavor, storage stability and legal labeling.
Buyer questions
TKPP supplies potassium rather than the sodium supplied by TSPP and is water-soluble. It may fit a potassium-based or sodium-reduction strategy, but the complete sodium and potassium content, pH, functionality, flavor, cost and market rules must be assessed.
Yes. Tetrapotassium pyrophosphate, tetrapotassium diphosphate and potassium pyrophosphate are commonly used names for K₄P₂O₇, CAS 7320-34-5 and INS 450(v).
No. It avoids sodium from this phosphate salt, but sodium may still come from salt, proteins, flavors and other ingredients. Any low- or reduced-sodium claim must be calculated and validated under destination-market rules.
Define water temperature and hardness, target concentration, agitation, salt/mineral content and ingredient order. Record dissolution time, clarity, sediment and solution pH for the offered grade.
Not as currently written: its fluoride limit is 30 mg/kg, while JECFA and the cited EU specification state 10 mg/kg. EU arsenic and lead limits are also tighter. Request a grade and batch COA matched to the required standard before approval.
Provide the application, sodium and potassium targets, current phosphate benchmark, required pH/solubility/particle data, specification or compendium, quantity, packaging, destination, Incoterm and required documents.
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