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Food Sci Nutr. 2016 May 31;5(2):215-222. doi: 10.1002/fsn3.384. eCollection 2017 Mar.

Removal of cadmium from contaminated Lentinula edodes by optimized complexation and coagulation.

Author information

1
Hubei Academy of Agricultural Sciences Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research Wuhan 430064 China.
2
Institute of Applied Mycology Huazhong Agricultural University Wuhan 430070 China.

Abstract

Heavy metal pollution is a serious problem for Lentinula edodes; however, the treatment of contaminated L. edodes has seldom been studied. This study investigated the removal of cadmium (Cd) from contaminated L. edodes and its lentinan by complexation and coagulation. Some influencing factors, such as pH, medical dosage, and preoxidation were examined. Cd complexation from contaminated Ledodes was shown to be more efficient under acidic conditions (pH 5.0), with a clearance rate of 80.47% in 25 mmol/L EDTA and 78.45% in 25 mmol/L sodium citrate. The Cd content in the lentinan of the contaminated L. edodes was markedly lower than that in the powdered mushroom (2.77 mg/kg vs. 19.49 mg/kg) and was easier to remove. The maximum Cd clearance rate (96.3%) for lentinan was obtained using an optimized process that involved preoxidation with 0.5 mg/L KMnO4, complexing with 25 mmol/L EDTA and 25 mmol/L sodium citrate, and coagulation with 50 mg/L activated carbon (AC) at pH 10.0.

KEYWORDS:

Cadmium; Lentinula edodes; heavy metal pollution; lentinan

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