Herbicides based on pelargonic acid: Herbicides of the bioeconomy

Ciriminna, Rosaria; Fidalgo, Alexandra; Ilharco, Laura M.; Pagliaro, Mario

doi:10.1002/bbb.2046

Cited by 42 publications

(48 citation statements)

References 21 publications

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“…The performance of PA herbicides depends on the concentration used and requires maximum coverage of the treated plant organs 17,20 . Climate conditions also interfere substantially their phytotoxic activity 15–17 . Thus, to prcevent external factors from affecting the efficacy of the test preparations, prior trials on climate conditions, weed size and application rate were performed (data not shown).…”

Section: Discussionmentioning

confidence: 99%

“…Currently, some of the most popular products for sustainable weed control are fatty acids (FA) with a carboxylic chain length of between eight and ten carbons, for example pelargonic (nonanoic) acid (PA) or a mixture of caprylic and capric acids 12,15–17 . For many years, the rancid odour of short‐chain FA has restricted its use in gardens, industry or crop production greenhouses, despite its popularity as a natural herbicide 15,18 . Currently, PA is the main proposed alternative for natural weed control in agriculture, being the most studied FA herbicide 15–18 .…”

Section: Introductionmentioning

confidence: 99%

“…For many years, the rancid odour of short‐chain FA has restricted its use in gardens, industry or crop production greenhouses, despite its popularity as a natural herbicide 15,18 . Currently, PA is the main proposed alternative for natural weed control in agriculture, being the most studied FA herbicide 15–18 . Notwithstanding its lack of toxicity, 19 environmental advantages 18 and fast and good efficacy, 20 there are some features limiting the use and combination of FA‐based compounds in agriculture.…”

Section: Introductionmentioning

confidence: 99%

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Capped polyethylene glycol esters of fatty acids as novel active principles for weed control

Campos

Verdeguer

Baur³

2021

Pest Management Science

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BACKGROUND Ever since the beginning of agriculture, yields have been threatened by weeds. Chemical weed control is far more effective and economical than other methods. The frequent use of herbicides has led to environmental and human health concerns, resulting in the banning of several herbicides and challenges for the future of important active compounds such as glyphosate. RESULTS The herbicidal activity of sustainable alternatives based on certain esters of fatty acids (FA), the action of which is unrelated to the free acid, on common weeds is assessed and reported. The 13 derivatives of FA showed better physicochemical properties than pelargonic acid‐based herbicides. All the reported compounds have phytotoxic activity, the highest efficacy being displayed by the methyl end‐capped polyethylene glycol (mPEG) ester of pelargonic acid having 6EO (ethylene oxide). This mPEG ester showed equal or better phytotoxicity than the pelargonic acid benchmark at reduced application rate and spray volume. The active compound is a liquid at ambient temperatures, has no bad smell and is not volatile, in contrast to pelargonic acid. Notably, this active compound can be the final product, can be sprayed without adjuvants and is relatively easy to co‐formulate. CONCLUSION A new lead substance is presented that is a sustainable alternative to current contact herbicides. In particular, it has potential application on railways, in precision agriculture and as a harvest aid. Its good performance and technical properties suggest this mPEG ester group may also overcome the volatility‐related problems of other organic acids such as auxins. © 2021 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Capped polyethylene glycol esters of fatty acids as novel active principles for weed control

Campos

Verdeguer

Baur³

2021

Pest Management Science

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“…Comprehensive reviews are available covering the use of essential oils as herbicidal substances [ 51 ], along with other natural active ingredients [ 60 ]. The results of this study show that the water extract of A. alba needles produced via hydrodynamic cavitation has an inhibitory effect on the germination of most weed species, in comparison to the control.…”

Section: Discussionmentioning

confidence: 99%

Effects of Silver Fir (Abies alba Mill.) Needle Extract Produced via Hydrodynamic Cavitation on Seed Germination

Ugolini

Crisci

Albanese

et al. 2021

Plants

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This paper describes the antigerminant capacity of water extracts of silver fir needles created by means of hydrodynamic cavitation processes. Fir needles (2 kg fresh weight) collected in the winter were blended and crushed in ice, poured in water only (120 L) and processed in a controlled hydrodynamic cavitation device based on a fixed Venturi-shaped reactor. The A. alba water extract (AWE), comprising an oil-in-water emulsion of silver fir needles’ essential oil (100% AWE), was diluted in distilled water to 75% and 50% AWE, and all aqueous solutions were tested as antigerminant against four weeds and four horticultural species and compared to control (distilled water). This study shows the effective inhibitory effect of pure AWE on germination, which mainly contains limonene (15.99 ng/mL) and α-pinene (11.87 ng/mL). Seeds showed delayed germination and inhibition but also a reduction in radicle elongation in AWE treatments as compared to control. This combined effect was particularly evident in three weeds (C. canadensis, C. album and A. retrofllexus) while horticultural species showed mainly effects on the radicle elongation as found in L. sativa, P. crispum and S. lycospermum, which showed on average 58%, 32% and 28%, respectively, shorter radicles than in the control. P. sativum was not affected by AWE, thus raising the hypothesis that seed characteristics and nutrition reserve might play a role in the resistance to terpenes inhibitory effect.

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“…Worthy of note is the fact that the commercial process for the synthesis of AA is accompanied by the formation of pelargonic acid (nonanoic acid, PA), which is characterized by a good antimicrobial activity and is used as sanitizing agent for food and in personal care products, as well as in the production of herbicides. [10] Even more it is employed as a precursor of solvent for varnishes. [11] There are currently two main industrial technologies for the synthesis of these platform molecules:…”

Section: Introductionmentioning

confidence: 99%

The Oxidative Cleavage of 9,10‐Dihydroxystearic Triglyceride with Oxygen and Cu Oxide‐based Heterogeneous Catalysts

et al. 2021

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This paper deals with a new heterogeneous catalyst for the second step in the two-step oxidative cleavage of unsaturated fatty acids triglycerides derived from vegetable oil, a reaction aimed at the synthesis of azelaic and pelargonic acids. The former compound is a bio-monomer for the synthesis of polyesters; the latter, after esterification, is used in cosmetics and agrochemicals. The reaction studied offers an alternative to the currently used ozonization process, which has severe drawbacks in terms of safety and energy consumption. The cleavage was carried out with oxygen, starting from the glycol (dihydroxystearic acid triglyceride), the latter obtained by the dihydroxylation of oleic acid triglyceride. The catalysts used were based on Cu 2 + , in the form of either an alumina-supported oxide or a mixed, spinel-type oxide. The CuO/Al 2 O 3 catalyst could be recovered, regenerated, and recycled, yielding promising results for further industrial exploitation.

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Herbicides based on pelargonic acid: Herbicides of the bioeconomy

Cited by 42 publications

References 21 publications

Capped polyethylene glycol esters of fatty acids as novel active principles for weed control

Capped polyethylene glycol esters of fatty acids as novel active principles for weed control

Effects of Silver Fir (Abies alba Mill.) Needle Extract Produced via Hydrodynamic Cavitation on Seed Germination

The Oxidative Cleavage of 9,10‐Dihydroxystearic Triglyceride with Oxygen and Cu Oxide‐based Heterogeneous Catalysts

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