Improving bioavailability of phosphorous from cattle dung by using phosphatase immobilized on natural clay and nanoclay
Date
2012
Authors
Calabi Floody, M.
Velásquez, G.
Gianfreda, L.
Saggar, S.
Bolan, N.
Rumpel, C.
Mora, M.L.
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Advisors
Journal Title
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Type:
Journal article
Citation
Chemosphere, 2012; 89(6):648-655
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Abstract
The high P retention of acidic Andisols makes necessary to increase our technological approaches in pasture management in the animal system production. Here, we evaluated the clay- or nanoclay-acid phosphatase complexes for improving phosphorus mineralization from degraded cattle dung. We implemented an immobilization mechanism of acid phosphatase (AP) using natural clays (allophanic and montmorillonite) and nanoclays as support materials. Also, we evaluated the mineralization of organic P containing in decomposed cattle dung with clay- and nanoclay-AP complexes by incubation studies. Clays and nanoclays were characterized by microscopy techniques as atomic force and confocal-laser scanning microscopy. We found that these support materials stabilized AP by encapsulation. Our results showed that immobilization on allophanic or montmorillonite materials improved both the specific activity (4–48%) and the Vmax (28–38%) of AP. Moreover, the enzyme had a better performance when immobilized on clay and nanoclay from Andisol than on montmorillonite materials. Phosphorous mineralization of cattle dung was regulated by water-soluble P present in the dung and P re-adsorption on allophanic materials. However, we were able to detect a potential capacity of AP immobilized on allophanic nanoclays as the best alternative for P mineralization. Further research with initially low water-soluble P containing organic materials is required to quantify the P mineralization potential and bioavailability of P from dung.
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Dissertation Note
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Link to a related website: http://repositorio.conicyt.cl/themes/Mirage2/tutorial/guia_busquedas_avanzadas.pdf, Open Access via Unpaywall
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Copyright 2012 Elsevier Ltd