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Legras-Lecarpentier, D; Stadler, K; Weiss, R; Guebitz, GM; Nyanhongo, GS.
(2019): Enzymatic Synthesis of 100% Lignin Biobased Granules as Fertilizer Storage and Controlled Slow Release Systems
ACS SUSTAIN CHEM ENG. 2019; 7(14): 12621-12628. FullText FullText_BOKU

In an attempt to reduce the loss of fertilizer due to leaching, this study investigates for the first time the possibility of synthesizing lignosulfonate-based fertilizer slow release granules by using laccases as green catalysts. Trametes hirsuta laccases (THL) extensively oxidized and polymerized lignosulfonates resulting in 62 and 54% decrease in phenolic groups from 52 g in samples incubated at pH 6 and 7, respectively, and as evidenced by the formation insoluble polymers at pH 6 and 7 in less than 2 h. Preliminary attempts to synthesize 100% lignosulfonate granules resulted in highly brittle randomly breaking particles with most particles <0.5 mm in diameter when dried. In order to produce bigger and regular sized lignosulfonate granules, 1% w/w alginate was incorporated into the polymerized lignosulfonates resulting in perfectly stable granules. Release studies showed that 100% lignosulfonate-based granules released all of the potassium nitrate and potassium phosphate in <5 days. However, in addition to helping make perfect granules, the incorporation of 1% alginate allowed the prolonged release of fertilizer over 25 days. This study therefore shows for the first time the possibility of synthesizing 100% biodegradable fertilizer delivery systems using 100% green technology "enzymes".
Authors BOKU Wien:
Gübitz Georg
Nyanhongo Gibson Stephen
Stadler Karina Anna
Weiß Renate
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Find related publications in this database (Keywords)
Fertilizer controlled release
Lignin granules

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