| The Pleurotus cornucopiae is one of the main cultivated edible fungi Shandong Province.Its fruiting bodies delicate texture,nutrient-rich,also has avariety of health care,and play an important role in the transformation of waste materials of agriculture and forestry crops.In recent years,some studies have shown that some mushrooms have a certain enrichment effect on heavy metal elements.The safety and quality affect the industrial development and consumer health.It is necessary to study the effects of heavy metals such as As,Cd,Pb and Hg on the pollution,safety and nutrient quality of Pleurotus cornucopiae fruit body.This study was focused on the absorption and accumulation regulation of heavy metals elements and nutritive values of the Pleurotus cornucopiae,,through the pollution evaluation,absorption and accumulation of heavy metals elements by the Pleurotus cornucopiae,and we assessed the nutrient contents,amino acids score(AAS),chemistry score(CS),amino acid index,biological value and nutrition index of the Pleurotus cornucopiae.Using the addition of different concentrations of heavy metals in the culture material,the mushroom bag plant cultivation the Pleurotus cornucopiae test,combined with test analysis,data retrieval and mathematical statistics.The results showed that:1.The pollution index for sporocarp of the Pleurotus cornucopiae was increased with increasing of addition amounts of four heavy metals including As,Cd,Pb and Hg elements.Among them,with the increase of Pb content,the pollution index was less than 1,and the enrichment degree of Pb was relatively low,and with the increase of Hg,the pollution index doubled and the absorption capacity of Hg.2.The ability of absorption heavy metals by cultivation materials of the Pleurotus cornucopiae was found,while the differences on this absorption ability were presented for the absorption processes of different heavy metals elements(Hg>Cd>As>Pb).The absorption curves of As,Cd,Pb and Hg elements presented significant(P<0.05)or very significant(P<0.01)levels and the correlation coefficients of four elements were 0.8705,0.7557,0.8644 and 0.9739,respectively.3.The yield of the Pleurotus cornucopiae was decreased with the addition amount increasing of As,Cd,Pb and Hg elements,while there had significant differences between four heavy metals elements.The limitation value of As,Cd,Pb and Hg elements in the cultivation materials for the Pleurotus cornucopiae were 2.3mg/kg,0.66mg/kg,33.0mg/kg and-0.05mg/kg(no Hg in cultivation materials),respectively.The measurement values of these elements were no more than the limitation value,and the Pleurotus cornucopiae is regarded as“Quality Safe Production”according to the National Food Safe Standard.4.The nutrient contents and nutritive values for the Pleurotus cornucopiae were significant affects by the heavy metals elements.The As elements addition in the cultivation materials was bad for protein formation in the Pleurotus cornucopiae according to the measurement of nutrient contents.Also the ash content of Pleurotus cornucopiae fruiting bodies was significantly decreased with the increase of As and Pb addition.There had a negative correlation between the addition amount of heavy metals elements in culture medium and the fat content in the sporocarp of the Pleurotus cornucopiae.The total content of amino acid was affected by the As,Cd,Pb and Hg elements addition that decreased the AAS and CS,according to the measurement of AAS,CS and amino acid index.The decreased contents for amino acid were measured with the Pb and Hg elements addition,respectively,down 1.6%,1.5%.The content of essential amino acids was decreased 3.4%,1.2%and 24.6%by the increase of the Cd,Pb and Hg content addition. |
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