Effective Removal of Cadmium Ions from a Simulated Gastrointestinal Fluid by Lentinus edodes

Xin Qiao, Wen Huang and Yinbing Bian
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Xin Qiao: College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
Wen Huang: College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
Yinbing Bian: Institute of Applied Mycology, Huazhong Agricultural University, Wuhan 430070, China

IJERPH, 2014, vol. 11, issue 12, 1-13

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.

Keywords: adsorption; antidote; cadmium; heavy metal; L. edodes; simulated gastrointestinal fluid (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2014
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