{"id":2679,"date":"2026-09-26T04:28:49","date_gmt":"2026-09-26T04:28:49","guid":{"rendered":"https:\/\/nhdbio.com\/afa-aaf-faa-sequence-order-peptide-solubility-data\/"},"modified":"2026-10-01T14:30:53","modified_gmt":"2026-10-01T14:30:53","slug":"%d8%a8%d9%8a%d8%a7%d9%86%d8%a7%d8%aa-%d9%82%d8%a7%d8%a8%d9%84%d9%8a%d8%a9-%d8%b0%d9%88%d8%a8%d8%a7%d9%86-%d8%a7%d9%84%d8%a8%d8%a8%d8%aa%d9%8a%d8%af-%d8%ad%d8%b3%d8%a8-%d8%aa%d8%b3%d9%84%d8%b3%d9%84","status":"publish","type":"post","link":"https:\/\/nhdbio.com\/ar\/afa-aaf-faa-sequence-order-peptide-solubility-data\/","title":{"rendered":"AFA \u0648AAF \u0648FAA: \u0644\u0645\u0627\u0630\u0627 \u064a\u0624\u062b\u0631 \u062a\u0631\u062a\u064a\u0628 \u062a\u0633\u0644\u0633\u0644 \u0627\u0644\u0628\u0628\u062a\u064a\u062f \u0639\u0644\u0649 \u0642\u0627\u0628\u0644\u064a\u0629 \u0627\u0644\u0630\u0648\u0628\u0627\u0646\u061f"},"content":{"rendered":"

Three tripeptides contain the same amino acids, but their measured water solubility was far from interchangeable.<\/p>\n

\u0645\u0627 \u0627\u062e\u062a\u0628\u0631\u062a\u0647 \u0627\u0644\u062f\u0631\u0627\u0633\u0629 \u0641\u0639\u0644\u064a\u064b\u0627<\/h2>\n

The researchers compared Ala-Phe-Ala (AFA), Ala-Ala-Phe (AAF), and Phe-Ala-Ala (FAA). Their tests used pure water near pH 6.8 at room temperature, with solubility measured in three independent experiments. Moving phenylalanine to a different position preserved the molecular composition but altered the solid-state packing and the concentration that could remain in solution.<\/p>\n

\u0623\u0631\u0642\u0627\u0645 \u062a\u0633\u062a\u062d\u0642 \u0627\u0644\u0642\u0631\u0627\u0621\u0629 \u0641\u064a \u0633\u064a\u0627\u0642\u0647\u0627<\/h2>\n\n\n\n\n\n\n\n
\u0645\u0642\u064a\u0627\u0633 \u0627\u0644\u062f\u0631\u0627\u0633\u0629<\/th>\n\u0627\u0644\u0646\u062a\u064a\u062c\u0629 \u0627\u0644\u0645\u0646\u0634\u0648\u0631\u0629<\/th>\n<\/tr>\n<\/thead>\n
AFA<\/td>\n672 mM<\/td>\n<\/tr>\n
AAF<\/td>\n105 mM<\/td>\n<\/tr>\n
\u0625\u062f\u0627\u0631\u0629 \u0627\u0644\u0637\u064a\u0631\u0627\u0646 \u0627\u0644\u0641\u064a\u062f\u0631\u0627\u0644\u064a\u0629 (FAA)<\/td>\n42 mM<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The AFA value is about 6.4 times the AAF value and 16 times the FAA value in this experiment. The comparison warns against predicting a peptide\u2019s usable stock concentration solely from its amino-acid count or an average hydrophobicity score. Position and solid-state behavior mattered for these three molecules. It does not prove that rearranging any other sequence will produce the same direction or size of effect.<\/p>\n

\u0645\u0627 \u064a\u062c\u0628 \u0625\u062f\u0631\u0627\u062c\u0647 \u0641\u064a \u0637\u0644\u0628 \u0627\u0644\u0639\u0631\u0636 \u0623\u0648 \u062e\u0637\u0629 \u0627\u0644\u062a\u062c\u0631\u0628\u0629<\/h2>\n

For a new sequence, specify the exact residue order in the RFQ and describe the intended solvent, pH, and target concentration. Ask whether a solubility observation was actually measured for that sequence and lot, and what method distinguished a clear-looking dispersion from a true solution. If the protocol requires a concentrated stock, set an acceptable concentration and recovery criterion before ordering.<\/p>\n

\u062d\u062f \u0627\u0644\u0623\u062f\u0644\u0629<\/h2>\n

These are published measurements for three small model tripeptides, not NHD batch data or a universal solubility specification. AFA, AAF, and FAA should not be treated as interchangeable products merely because their compositions match.<\/p>\n

\u0627\u0644\u0645\u0635\u0627\u062f\u0631 \u0648\u0627\u0644\u062e\u0637\u0648\u0629 \u0627\u0644\u062a\u0627\u0644\u064a\u0629<\/h2>\n

\u0627\u0644\u0628\u062d\u062b \u0627\u0644\u0623\u0633\u0627\u0633\u064a: \u062a\u062d\u062f\u062f \u0637\u0631\u064a\u0642\u0629 \u0627\u0644\u062a\u0639\u0628\u0626\u0629 \u0641\u064a \u0627\u0644\u062d\u0627\u0644\u0629 \u0627\u0644\u0635\u0644\u0628\u0629 \u0642\u0627\u0628\u0644\u064a\u0629 \u0627\u0644\u0630\u0648\u0628\u0627\u0646 \u063a\u064a\u0631 \u0627\u0644\u0645\u062a\u0648\u0642\u0639\u0629 \u0644\u0644\u0628\u0628\u062a\u064a\u062f\u0627\u062a \u0627\u0644\u0639\u0637\u0631\u064a\u0629<\/a>. \u0647\u0630\u0647 \u0627\u0644\u0623\u0631\u0642\u0627\u0645 \u0627\u0644\u062e\u0627\u0631\u062c\u064a\u0629 \u0644\u064a\u0633\u062a \u0646\u062a\u0627\u0626\u062c \u0627\u062e\u062a\u0628\u0627\u0631 \u0644\u062f\u0641\u0639\u0629 NHD.<\/p>\n

\u062f\u0644\u064a\u0644 NHD \u0630\u0648 \u0627\u0644\u0635\u0644\u0629: \u0627\u0642\u0631\u0623 \u0627\u0644\u0645\u0642\u0627\u0644 \u0630\u0627 \u0627\u0644\u0635\u0644\u0629<\/a>. \u0644\u0633\u0624\u0627\u0644 \u062e\u0627\u0635 \u0628\u0645\u0627\u062f\u0629 \u0645\u0639\u064a\u0646\u0629\u060c \u0627\u0637\u0644\u0628 \u0639\u0631\u0636 \u0633\u0639\u0631 \u0645\u0643\u062a\u0648\u0628<\/a> \u0645\u0639 \u0627\u0644\u062a\u0633\u0644\u0633\u0644 \u0648\u0627\u0644\u0643\u0645\u064a\u0629 \u0648\u0627\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u0645\u0642\u0635\u0648\u062f \u0648\u0627\u0644\u0633\u062c\u0644\u0627\u062a \u0627\u0644\u0645\u0637\u0644\u0648\u0628\u0629.<\/p>","protected":false},"excerpt":{"rendered":"

Three tripeptides contain the same amino acids, but their measured water solubility was far from interchangeable.<\/p>","protected":false},"author":1,"featured_media":3978,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pim_family_ids":"","pim_article_type":"Primary-literature evidence note","pim_evidence_level":"External laboratory or process evidence; not clinical or NHD lot validation","pim_reviewer":"AI-assisted source cross-check (not independent expert peer review)","pim_reviewed_date":"2026-09-28","pim_editorial_note":"These are published measurements for three small model tripeptides, not NHD batch data or a universal solubility specification. AFA, AAF, and FAA should not be treated as interchangeable products merely because their compositions match.","pim_review_status":"reviewed","pim_review_reason":"","pim_creation_method":"AI-assisted writing and source verification. Numerical claims were checked against the linked full-text records, with source inconsistencies identified in the article. This is not independent scientific peer review or verification of a supplied lot.","pim_sources":"[{\"title\":\"Solid-state packing dictates the unexpected solubility of aromatic peptides\",\"url\":\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC8063180\/\",\"note\":\"\"}]","footnotes":""},"categories":[19],"tags":[],"class_list":["post-2679","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-published-study-cases"],"yoast_head":"\nAFA, AAF and FAA: Why Peptide Sequence Order Changes Solubility - NHD<\/title>\n<meta name=\"description\" content=\"Three tripeptides contain the same amino acids, but their measured water solubility was far from interchangeable. 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