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International Journal of Tryptophan Research is Scopus-indexed (Q1, CiteScore 7.8), WoS ESCI. It is covered by India's One Nation One Subscription scheme for reading access. Published by SAGE Publications Ltd.
Checked against the index lists dated .
ISSN 1178-6469Verify ISSN ↗
Publisher: SAGE Publications Ltd
Cost to publish: About US$4,400 to publish open access (publisher list price, via OpenAlex) — subscription publishing may be free
| Subject area | Rank | Pctile | Q |
|---|---|---|---|
| Biochemistry | 97 / 448 | 78th | Q1 |
| Molecular Biology | 113 / 414 | 72nd | Q2 |
Not listed in: DOAJ, ABDC, ABS / AJG, FT50, UT Dallas, ONOS (APC covered)
Yes — actively indexed in Scopus, coverage 2008–present, best quartile Q1, CiteScore 7.8.
International Journal of Tryptophan Research is Q1 in Biochemistry (rank 97 of 448) and Q2 in Molecular Biology (rank 113 of 414), by CiteScore 2025.
International Journal of Tryptophan Research is indexed in the Emerging Sources Citation Index, so it may have a Journal Impact Factor in Clarivate's Journal Citation Reports. JCR is paid, so check it for the current value. The closest free measure is its Scopus CiteScore 7.8, which places it in quartile Q1 at the 78th percentile of its subject. Its SCImago Journal Rank (SJR, a free Scopus-based metric) is 1.129, quartile Q1, with an H-index of 38.
The publisher lists an article processing charge of about US$4,400 for open access (source: OpenAlex). Many journals also publish by the subscription route at no cost to the author, so confirm on the journal's own website.
International Journal of Tryptophan Research is published by SAGE Publications Ltd. Its ISSN is 1178-6469.
Yes. It is part of the One Nation One Subscription (ONOS) national subscription, so readers at participating Indian institutions get its full text. ONOS does not cover its article processing charge.
Yes — indexed in the Emerging Sources Citation Index.
No — it is not registered as an open-access journal in DOAJ or Scopus.
International Journal of Tryptophan Research has an h-index of 42 and a 2-year mean of 3.35 citations per paper (OpenAlex). Its Scopus CiteScore is 7.8, quartile Q1. On 2-year citations it ranks #168 of 442 Scopus journals in Biochemistry.
International Journal of Tryptophan Research published 7 papers in 2025; its busiest recent year was 2020 with 22. 2026* is the year so far.
h-index, i10-index and 2-year mean citedness are open, licence-clear metrics from OpenAlex — not a proprietary impact factor. The subject rank counts only journals that OpenAlex has a figure for; it is not a Scopus or Clarivate ranking. Updated 2026-10-14.
In its latest 74 research articles (2021–2026), authors are most often from Australia (12.6%), Japan (11.5%) and United States (8.6%).
Countries are counted fractionally, so a paper by authors from two countries counts half to each.
Scopus status: Active. No retracted papers are recorded. The Problematic Paper Screener flags none of its papers. These are indicators to check, not findings against the journal.
Retractions from OpenAlex; flags from the Problematic Paper Screener (Cabanac, Labbé & Magazinov, CC BY), 2026-09-21 export. A flag marks a paper for a closer look; it is not a finding against the journal.
Index data is curated from public sources (Scopus, Web of Science, ABDC, FT50, UT Dallas, DOAJ). CiteScore and quartiles reflect the latest available Scopus release. Always verify a journal's current status on its official source before submitting.
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