Essential Oils from Piper lhotzkyanum Kunth Leaves from Brazilian Atlantic Forest: Chemical Composition and Stability in Different Storage Conditions
- PMID: 34121027
- DOI: 10.5650/jos.ess20332
Essential Oils from Piper lhotzkyanum Kunth Leaves from Brazilian Atlantic Forest: Chemical Composition and Stability in Different Storage Conditions
Abstract
This work aimed to evaluate the impact of different storage conditions and light and temperature exposures on the visual aspect and chemical composition of the essential oil (EO) of Piper lhotzkyanum Kunth, obtained from leaves by hydrodistillation from a region of high altitude. For this purpose, aliquots of the EO were stored for up to 90 days (a) under a refrigerator condition of 5 ± 3°C, (b) under a long-term (LT) condition of 30 ± 2°C and 75 ± 5% relative humidity (RH) and an accelerated condition (AS) of 40 ± 2°C and 75 ± 5% RH, and (c) in a photostability test achieved in amber and colorless glass vials. The changes were monitored on days 0 (control), 60, and 90 for the refrigerator, LT, and AS conditions. All EO chemical analyses were assessed by GC-FID and GC-MS for quantification and identification, respectively. It is reported, for the first time, that the EO of P. lhotzkyanum is rich in the sesquiterpenes β-elemene and α-zingiberene. No significant changes in the EO was observed, revealing a minimal impact of temperature on the sample at the different storage conditions. However, there was a change in the content of α-zingiberene to bicyclogermacrene after exposure to light. The visual appearance of the samples was altered for all test conditions except the refrigerator condition. These results can potentially contribute to the product development of a bioactive EO from leaves of P. lhotzkyanum, a sesquiterpene rich natural material.
Keywords: Piper; sesquiterpenes; stability; α-zingiberene; β-elemene.
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