{"topic_id":"additive_crosswalk_l_tryptophan","category":"additive-crosswalk","context":"---\ntopic_id: additive_crosswalk_l_tryptophan\ncategory: additive-crosswalk\ntitle: \"L-色氨酸 — additive cross-jurisdiction identity (CN 公告2045 / EU Reg 1831/2003 / AAFCO 2024)\"\nlang: en\nsource: \"CN 农业部公告第2045号 饲料添加剂品种目录 (first-hand); EU Reg (EC) 1831/2003 authorisation acts (first-hand, fetched EUR-Lex); AAFCO Official Publication 2024 Ch.6 (first-hand). Derived crosswalk; each cell traced to the named source entry.\"\nsource_file: pdf-raw/cn-law/cn_feed_additive_dir_ann2045_fujian_compile.normalized.txt ; pdf-raw/eu-2026/additives/eu_l_tryptophan.html ; pdf-parsed/us-2026/aafco_ch6_2024_parsed.json\nsource_type: government_regulation\ndate_parsed: 2026-08-07\ntokens_estimated: 600\nverification: {method: derived_from_dataset, claims: 2, passed: 2, date: 2026-08-07}\ncitation:\n  authority: \"MARA 公告2045 (CN) / European Commission Reg (EC) 1831/2003 (EU) / AAFCO (US)\"\n  title: \"L-色氨酸 — additive cross-jurisdiction identity\"\n  url: \"https://eur-lex.europa.eu/eli/reg/2003/1831\"\n  source: [\"https://www.aafco.org/\", \"http://www.moa.gov.cn/\"]\n  retrieved: \"2026-08-07\"\n  ref: \"Each jurisdiction's name/authorisation is quoted from the first-hand source; the crosswalk verdict is a derived comparison anchored on substance identity, not a claim of regulatory equivalence.\"\n  doc_type: \"derived crosswalk of first-hand regulations (public domain)\"\n  needs_review: false\nauthority_tier: T1\nauthority_tier_basis: \"T1: derived from T1 first-hand government regulations (CN/EU/AAFCO)\"\nauthority_tier_date: 2026-08-07\n---\n\n# L-色氨酸 — additive cross-jurisdiction identity\n\nDerived crosswalk of how one feed additive is named and authorised across three jurisdictions. **No claim of regulatory equivalence is made** — pairings are anchored on the substance identity, and the verdict states where the definitions actually diverge.\n\n- **Substance anchor:** L-色氨酸\n- **Verdict:** `closest_with_differences`\n\n## Per-jurisdiction entry\n\n- **🇨🇳 CN — 公告2045 `L-色氨酸`**: L-色氨酸 is listed in 表一 饲料添加剂品种目录 (category 氨基酸、氨基酸盐及其类似物 for amino acids / 矿物元素及其络（螯）合物 for chelates / 维生素及类维生素 for vitamins), scope 养殖动物 (all livestock and poultry). _(src: CN 公告2045)_\n- **🇪🇺 EU — Reg 1831/2003 `(EU) 2017/873`**: Commission Implementing Regulation (EU) 2017/873 of 22 May 2017 concerning the authorisation of L-tryptophan produced by Escherichia coli as a feed additive for all animal species (Text with EEA relevance _(src: EU (EU) 2017/873)_\n- **🇺🇸 AAFCO (US) — Ch.6**: No stand-alone AAFCO OP 2024 Ch.6 entry for this substance. AAFCO defines amino acids / vitamins only where a corresponding feed ingredient (often a fermentation product) is listed; where absent, the cell is an honest gap, not a claim of non-existence. _(src: AAFCO OP 2024 Ch.6 — gap)_\n\n## Crosswalk verdict\n\nCN 公告2045 and EU 2017/873 both authorise L-tryptophan for all animal species. AAFCO OP 2024 Ch.6 has no stand-alone L-tryptophan entry. Verdict: CN↔EU equivalent; AAFCO gap.\n\n## Sources\n\n- CN: 农业部公告第2045号 《饲料添加剂品种目录》 (first-hand; fujian compile txt, intra-cell line wraps normalised for verbatim quotation)\n- EU: https://eur-lex.europa.eu/eli/reg_impl/2017/873/oj/eng (first-hand EUR-Lex, fetched 2026-08-07)\n- AAFCO: OP 2024 Ch.6 — no matching stand-alone entry (honest gap)\n","sources":["additive-crosswalk — L-色氨酸 — additive cross-jurisdiction identity (retrieved 2026-08-07)"],"source":{"authority":"additive-crosswalk","title":"L-色氨酸 — additive cross-jurisdiction identity","url":"https://www.aafco.org/","retrieved":"2026-08-07","ref":"","doc_type":"official PDF","source_document":"","verification_file":"pdf-raw/cn-law/cn_feed_additive_dir_ann2045_fujian_compile.normalized.txt ; pdf-raw/eu-2026/additives/eu_l_tryptophan.html ; pdf-parsed/us-2026/aafco_ch6_2024_parsed.json"},"source_document":"","source_file":"pdf-raw/cn-law/cn_feed_additive_dir_ann2045_fujian_compile.normalized.txt ; pdf-raw/eu-2026/additives/eu_l_tryptophan.html ; pdf-parsed/us-2026/aafco_ch6_2024_parsed.json","trust":{"authority_tier":"T1","fidelity":"verbatim","license":null,"display_grade":"A"},"tokens_estimated":600,"generated_at":null,"tip":"Use /api/v1/topics to discover more topics. /api/v1/nutrient for precise single-point queries. /api/v1/cross_compare for 2-3 standard comparisons."}