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Biodegradable amidequats, derivatives of caprylic and pelargonic acids as cationic surfactants for agricultural applications


[ 1 ] Instytut Technologii i Inżynierii Chemicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ P ] employee | [ S ] student

Scientific discipline (Law 2.0)

[7.6] Chemical sciences

Year of publication


Published in

Journal of Molecular Liquids

Journal year: 2023 | Journal volume: vol. 391, part A

Article type

scientific article

Publication language


  • Amidequats
  • Biodegradation
  • Foaming properties
  • Herbicidal ionic liquids
  • Phytotoxicity

EN In this study, we proposed to incorporate natural herbicides i.e. caprylic and pelargonic acids into an amide functional group of a cationic surfactant, thus obtaining amidequats. All the obtained amidequats can be classified as ionic liquids since their melting point values were below 100 °C. Moreover, all compounds were stable up to 166 °C. The obtained ionic liquids exhibited high surface activity, as confirmed by their low CMC values (ranging from 0.02 to 4.32 mmol·L−1) as well as their ability to efficiently lower the surface tension (to 23.8–30.2 mN·m−1). The amidequats, derivatives of caprylic and pelargonic acid exhibited different foam formation ability and its stability depending on their structure. Subsequent tests indicated that amidequats comprising the decyl and dodecyl substituents were readily biodegradable (mineralization at 63–78 % within 10 days). They did not significantly affect the germination of the model monocotyledon plant (sorghum) up to 500 mg·L−1, however, they showed phytotoxicity in relation to the model dicotyledon weed (common sunflower) and displayed low or moderate toxicity towards model microorganisms commonly found in soil, which confirms their low environmental impact.

Date of online publication


Pages (from - to)

123221-1 - 123221-11





Article number: 123221

License type

CC BY (attribution alone)

Open Access Mode

czasopismo hybrydowe

Open Access Text Version

final published version

Release date


Date of Open Access to the publication

at the time of publication

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Ministry points / journal


Impact Factor

6 [List 2022]

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