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. 2021 Feb 5;26(4):825. doi: 10.3390/molecules26040825

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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¹H-NMR spectra in DMSO-d₆. (A) Plumbagin (see insert) extracted from Nepenthes x ventrata leaves and (B) a plumbagin reference. (C) Details of ¹H NMR spectra of a plumbagin reference and (D) the volatile exudate emitted by N. x ventrata pitcher material. Asterisks (*) indicate the presence of 4-tert-butylcatechol, a polymerization inhibitor probably extracted from the plastic material, and hashes (#) account for an unidentified impurity. The intensity of the aromatic range in (C) was increased as indicated by the factor.

¹H-NMR spectra in DMSO-d₆. (A) Plumbagin (see insert) extracted from Nepenthes x ventrata leaves and (B) a plumbagin reference. (C) Details of ¹H NMR spectra of a plumbagin reference and (D) the volatile exudate emitted by N. x ventrata pitcher material. Asterisks (*) indicate the presence of 4-tert-butylcatechol, a polymerization inhibitor probably extracted from the plastic material, and hashes (#) account for an unidentified impurity. The intensity of the aromatic range in (C) was increased as indicated by the factor.