Abstract
Lentinus edodes, a functional food, was evaluated as a potential antidote for adsorption/removal of cadmium ion from simulated gastrointestinal fluids. An adsorption/removal capacity of 65.12 mg/g was achieved by L. edodes in solutions with a pH ranging from 2.5 to 6.0, while little if any adsorption was observed in solutions with a pH under 2.5. In solutions with pH 6.0, 84% of the cadmium adsorption by L. edodes occurred in the first minute. Scanning electronic microscopic examination showed that the cell wall polysaccharides of L. edodes provided a rough sponge-like surface for effective cadmium adsorption. FTIR indicated that the carboxyl, hydroxyl and –NH groups of the cell wall polysaccharides and proteins were the primary functional groups that chemically bind with cadmium ions. The energy dispersive spectrometry further revealed that cation exchange might be attributed to cadmium biosorption. These results suggested that L. edodes was effective for cadmium detoxication, especially in low concentration.
Highlights
Cadmium pollution has become a serious issue in recent years [1]
The pH effect was evaluated for cadmium adsorption by
Little if any cadmium adsorptions were observed when the pH was less than 2.5; the cadmium adsorption increased from 0 to 65.12 mg/g when the pH increased from 2.5 to 6.0; while no further increase of adsorption when the pH further increased from 6.0 to 8.0. These results suggested that weak acid conditions favor effective cadmium adsorption by L. edodes
Summary
Cadmium pollution has become a serious issue in recent years [1]. Uptake of this toxic compound can result in multiple human health problems such as lung insufficiency, cardiovascular system disturbances, liver and kidney damage and cancer [2,3,4]. British anti-Lewisite, dimercapto-succinic acid (DMSA), dimercaptopropanesulfonate (DMPS) and ethylenediaminetetraacetic acid (EDTA) are used to treat patients suffering from heavy metal intoxication [5,6,7,8,9]. Upon administration, these chelating complexes bind with heavy metals such as cadmium, that will be removed eventually through the kidney. These chelating complexes bind with heavy metals such as cadmium, that will be removed eventually through the kidney This approach requires multiple administrations which may cause a burden to and damage the renal system during the clearance of metal chelates from the body. It is imperative to develop an effective and safe detoxification agent for the treatment of cadmium intoxication
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