Abstract
A novel herbicidal controlled release formulation composed of
(2,4-dichlorophenoxy) acetic acid (2,4-D) chemically bonded to
biodegradable (R,S)-3-hydroxybutyric acid oligomers was investigated. The
synthesis of (R,S)-3-hydroxy butyric acid oligomers was carried out via
the ring opening polymerization of β-butyrolactone initiated by
2,4-dichlorophenoxy acetic potassium salt in the presence of complexing
agents. The formed oligomers were characterized by size exclusion
chromatography, proton magnetic resonance and electrospray mass
spectrometry in order to fi nd out their molar mass distribution and
molecular structures. An assessment of biological effectiveness of the
obtained herbicidal formulation was carried out in the greenhouse vs.
Sinapis alba var. Nakielska. A promotion of the controlled release
formulation with decreased water solubility and with low vapor pressure of
the active ingredient, instead of traditional formulations of
2,4-dichlorophenoxy acetic acid may help to ensure a greater safety for
workers and reduce the risk of dissemination of the active ingredient in
the soil profi le.
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