International Journal of Environmental Protection          
An Open Access Journal
ISSN: 2226-6437(Print)      ISSN: 2224-7777(Online)
Frequency: Annually
Editorial-in-Chief: Prof. Kevin Mickus,
Missouri University of Science & Technology, USA.
Using Extracellular Enzyme Activity as a Pollutant Indicator: a Field Study in Chinchiná River, Caldas – Colombia
Full Paper(PDF, 1040KB)
Abstract:
The present study investigated the existence of a relationship between Extracellular Enzyme Activity (EEA) of glucosidase and alkaline phosphatase and pollution by carbon and phosphorous at five stations on the Chinchiná River in the water main and the biofilm (epilithon/episammon) during three seasons (rainy, dry and transition). Specific substrates were used as sources: 4-Nitrophenyl-β-D-Glucopyranose as a carbon source and 4-Nitrophenylphosphate as a phosphorus source. The product of catalysis (4-nitrophenol) was detected spectrophotometrically at an emission of 405nm. The ratio of EEA to temperature and pH was also determined. All sampling stations displayed EEA; however, reported results were higher for phosphatase, specifically in the biofilm, in all seasons; this indicates that certain associated microorganisms in this matrix can act as a multi-enzyme system which allows for easy disposal of substrate and the presence of catalysis. A relationship could not be established to describe EEA in dissolved organic carbon (DOC), because EEA was not detected in water samples from all stations during the three sampling seasons (E1, E2 and E4), because the bioavailability of nutrients attributed to the discharge of domestic wastewater from the municipalities of Manizales and Villamaría. Additionally, the complexity of the links between the monosaccharides which comprise polymers affects the degradation rate of the material, since the enzymes produced by microorganisms in the water prefer to hydrolyze specific regions (regiospecific) of the molecule. Enzyme activity can be affected by the structure of the polysaccharide being degraded. Therefore, some trends, such as those which occur at lower DOC concentrations, exhibit greater EEA. During the dry season, a correlation was found between phosphatase and glucosidase EEA in samples of water related to the concentration of orthophosphates and filtered COD, respectively. This indicates that higher concentrations of orthophosphates result in higher EEA of the phosphatase, and that higher concentrations of CODs result in higher EEA of the glucosidase.
Keywords:Alkaline Phosphatase; Extracellular Enzyme Activity; Epilithon; Glucosidase; Nitrophenol; Chinchiná River
Author: Marco Tulio Jaramillo Salazar1, Néstor Jaime Aguirre Ramírez2, Jhon Henry Galvis García1
1.Faculty of Natural Sciences, University of Caldas, GEAAS Group, Manizales, The Republic of Colombia
2.Faculty of Engineering, University of Antioquia, GEOLIMNA Group, Medellín, The Republic of Colombia
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