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the claim
Amino acids have their lowest solubility at their isoelectric point
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

Proteins and amino acids have their minimum solubility at their isoelectric point due to having a net zero charge, which minimizes electrostatic repulsion and promotes aggregation.

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The analysis

The claim that amino acids and proteins have their lowest solubility at their isoelectric point is a fundamental biochemical principle taught as common knowledge, supported by basic physical chemistry and corroborated by studies describing protein precipitation at the isoelectric point.

Everything we examined (12)
We also searched for evidence AGAINST this claim, not only for it.
  1. Physicochemical and structural properties of proteins extracted from dehulled industrial hempseeds: Role of defatting process and precipitation pHpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. Accurate estimation of isoelectric point of protein and peptide based on amino acid sequencespeer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Oxidative stability of isoelectric solubilization/precipitation-isolated PSE-like chicken protein.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Isoelectric point-amyloid formation of α-synuclein extends the generality of the solubility and supersaturation-limited mechanismpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  5. Impact of pH on the Physicochemical, Structural, and Techno‐Functional Properties of Sesame Protein Isolatepeer-reviewedsupportsnot shown: read and graded, but this claim needs no citation to stand
  6. Preparation and characterization of protein isolate from Yellowfin tuna Thunnus albacares roe by isoelectric solubilization/precipitation processpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Electrophoretic characterization, amino acid composition and solubility properties of Macauba (Acrocomia aculeata L.) kernel globulinspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. Integrating biophysical modeling, quantum computing, and AI to discover plastic-binding peptides that combat microplastic pollution.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Predicting the Solubility of Amino Acids and Peptides with the SAFT-γ Mie Approach: Neutral and Charged Models.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. COMPARISON OF FUNCTIONAL AND TECHNOLOGICAL PROPERTIES AND AMINO ACID COMPOSITION OF PROTEIN ISOLATES OF PLANT ORIGINpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Recovery of North Pacific krill Euphausia pacifica proteins via isoelectric solubilization/precipitation using food additivespeer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. A Novel Dual-Payload ADC Platform Integrating Exatecan and Triptolide to Enhance Antitumor Efficacy and Overcome Resistance.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked06 Aug 2026
judged → COMMON KNOWLEDGE · 006 Aug 2026
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