Degradable Polyhydroxyalkanoates as Herbicide Carriers

Abstract

The biodegradable polymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) has been used to design experimental sustained-release formulations of the herbicide Zellek Super in the form of films and microgranules. The kinetics of polymer degradation and the dynamics of herbicide release show that the rate and extent of herbicide release from the polymer matrix into the soil depends on the geometry of the carrier and the proportion of the pesticide loaded into it (polymer/pesticide mass ratio). Experiments with the creeping bentgrass (Agrostis stolonifera L.) show that the formulations of the herbicide Zellek Super constructed as microgranules and films can be successfully used to suppress the growth of grasses. This study is the first to demonstrate that biodegradable polyhydroxyalkanoates can be used effectively to construct environmentally friendly sustained-release PHA-herbicide systems that can be placed into the soil together with seeds.

Constructing sustained‐release herbicide formulations based on poly‐3‐hydroxybutyrate and natural materials as a degradable matrix

“…16,32,33 Slow-release formulations of the 'Zellek Super' herbicide loaded into films and microgranules of P(3HB-co-3 HV) were prepared and investigated by a team of researchers, showing effective suppression of model weeds. 34 Other research showed the efficacy of slow-release formulations in wheat plant communities contaminated with weeds. 35 However, because of the relatively high cost of PHAs and the extensive use of pesticides in agriculture, a more effective approach is to blend available natural materials with PHAs rather than to use PHAs alone.…”

“…The use of poly‐3‐hydroxybutyrate (P(3HB)) and 3‐hydroxybutyrate‐co‐3‐hydroxyvalerate copolymers (P(3HB‐co‐3 HV)) (the most common representatives of PHAs) for fabricating microspheres loaded with ametrine and atrazine herbicides was previously reported . Slow‐release formulations of the ‘Zellek Super’ herbicide loaded into films and microgranules of P(3HB‐co‐3 HV) were prepared and investigated by a team of researchers , showing effective suppression of model weeds . Other research showed the efficacy of slow‐release formulations in wheat plant communities contaminated with weeds .…”

Biodegradable poly-3-hydroxybutyrate as a fertiliser carrier

“…Our team has prepared slow‐release pesticide ( α ‐hexachlorocyclohexane and lindane) formulations by embedding the pesticides into degradable poly‐3‐hydroxybutyrate/3‐hydroxyvalerate (P3HB/3HV) matrices and has shown that the pesticides are gradually released into soil, as the polymer is being degraded by soil microflora . Prudnikova et al described slow‐release formulations of the herbicide Zellek Super encapsulated in P3HB/3HV and showed the effectiveness of this formulation against creeping bentgrass ( Agrostis stolonifera L.). Results of the studies of PHA biodegradation behaviour in natural soil ecosystems, which proved that polyhydroxyalkanoates are degraded in the natural media with a slow rate, suggest that these polymers can be used to construct new‐generation slow‐release fertiliser formulations.…”

“…Our team has prepared slow-release pesticide (a) (b) (c) ( -hexachlorocyclohexane and lindane) formulations by embedding the pesticides into degradable poly-3-hydroxybutyrate/3hydroxyvalerate (P3HB/3HV) matrices and has shown that the pesticides are gradually released into soil, as the polymer is being degraded by soil microflora. 15,16 Prudnikova et al 17 described slow-release formulations of the herbicide Zellek Super encapsulated in P3HB/3HV and showed the effectiveness of this formulation against creeping bentgrass (Agrostis stolonifera L.).…”

The Kinetics of Fungicide and Herbicide Release from Slow-Release Formulations Prepared from Degradable Poly-3- Hydroxybutyrate

“…К настоящему времени данные системы получили широкое распространение, что способствовало воз-никновению множества форм различного дизайна, а также использованию большого количества различных материалов (Blagoeva, Nedev, 2006). пестициды выходят в почву длительное вре-мя по мере разрушения носителя (Volova et al, 2008;Volova et al, 2016b;Voinova et al, 2009;Prudnikova et al, 2013).…”