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Quinic acid was tested in a CO2 Evolution Test according to the OECD Guideline 301 B for 28 days (and 29 days after acidification) to determine whether the test substance is readily biodegradable. The degradation extent of quinic acid reached 89.7% by the end of the test (mean of three replicates). On day 4 the degradation of quinic acid reached already 65.3%. The reference compound sodium benzoate reached the pass levels for ready biodegradability within 4 days. The degradation in the toxicity control after 4 days was 70.0% and thus above the criterion for inhibition effects to the inoculum. Quinic acid had no toxic effect to the inoculum according to the validity criteria of OECD 301 on ready biodegradability. Quinic acid reached the criteria for ready biodegradability (60% ThCO2 and 10-day time window). Therefore, it can be concluded that quinic acid is readily biodegradable.