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. 2026 Aug 13;13:1927483. doi: 10.3389/fnut.2026.1927483

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Copyright © 2026 Huang, Wu, Qu, Liu, Feng, Ren, Yang, Xu and Fan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Four line graphs display corrected detection rate versus log concentration (micrograms per liter) for linalool, geraniol, d-limonene, and alpha-terpineol. Each chart shows empirical data points with blue dots and a red fitted curve. Detection thresholds and correlation coefficients are labeled: linalool, 24.27; geraniol, 72.44; d-limonene, 247.17; alpha-terpineol, 1780.27 micrograms per liter, with R values above 0.97. Each graph includes a dashed line indicating the threshold detection point. — Sigmoidal olfactory threshold curves for four major terpenoid derivatives.