Analysis And Comparison Of Several Mineral Elements In Dried Edible Fungi Pollution And Main Harmful Elements Before Processing And Detection Methods

Edible mushrooms are a kind of large fungi for human consumption,in recent years,has served as a delicacy on the dinner table become food for families than indispensable.China is the earliest country food and artificial cultivation of edible fungi,black fungus,mushroom cultivation,respectively originates from before 1400 and 800 years ago.However,in recent years,edible fungi on heavy metal enrichment problem of pollution is also caused by various factors as an underestimated problem to float on water.Edible mushroom cultivated a wider geographical coverage,contamination levels in different regions and between different varieties of edible fungi nutrient elements distribution and content of polluting elements have different degrees of difference.Current detection of the minerals and metal elements include spectrophotometry,atomic absorption spectrophotometry,atomic fluorescence spectrophotometry,inductively coupled plasma Atomic emission spectrometry and inductively coupled plasma mass spectrometry,with the rapid expansion of food safety risks,seeking more efficient data more accurate detection method for the moment.This article has 18 kinds of edible mushrooms on the market determination of ten kinds of minerals,localities and in different regions were compared between species and data analysis;Five types of pollution elements of edible fungi on 18 separate pretreatment and detection methods are collocation,focus on four groups of data.Mineral elements by wet digestion-inductively coupled plasma-Atomic emission spectrometry method for determination of some elements do the experiment,the results between the 91.6%~111.7%,this method Ca,Mg,Na,Fe,K,Cu,Zn,P,Se,Mn,0.032 mg/kg bw,respectively,and detection limit 0.002 mg/kg bw,0.014 mg/kg bw,0.084 mg/kg,0.025 mg/kg,0.005 mg/kg bw,0.002 mg/kg bw,0.017 mg/kg,0.015 mg/kg bw,and 0.0014 mg/kg,recovery rates between 91.6%~111.7%.Then on 18 pieces samples for has analysis compared,by content compared,K > P > Mg > Ca > Na > Fe(Zn)> Mn > Se > Cu,by geographical points,Heilongjiang,and Gansu area produced mushrooms Ca content high,Fujian produced mushrooms Na,and Fe,and K,and Zn,and P content high,Heilongjiang produced mushrooms Cu content high;by varieties points,hericium erinaceus mushroom Ca,and Mg,and Na,and Zn content slightly low,tea mushroom Cu,and P content high.Has carried on the heavy metal average content comparison to the edible fungus,does the shiitake mushroom is Cd,Cr> As> Pb> Hg,Zhejiang area Cd varying degree exceeding the allowed figure,other have not surpassed the limiting value.Between the different mold mushroom spawn,the Cd content and the Pb content difference is obvious.Used 4 species method(1)wet type digestion-inductance coupled plasma emission method(2)for microwave digestion-Atomic fluorescent spectrum method determination total As,and total Hg,graphite furnace atomic absorption points light photometric method determination Pb,and Cd,and total Cr(3)for wet method-Atomic fluorescent spectrum method determination total As,and total Hg,graphite furnace atomic absorption points light photometric method determination Pb,and Cd,and total Cr II for microwave digestion-inductance coupled plasma emission method on 18 species mushroom for pollution elements(Pb,and Cd,and Cr,and As,and Hg)detection,through data compared have,Microwave digestion digestion and efficiency than traditional wet digestion;when measuring low levels of As,Hg,than by atomic fluorescence spectrophotometry inductively coupled plasma Atomic emission spectrometry,while Pb,Cr,Cd,graphite furnace atomic absorption spectrophotometry inductively coupled plasma Atomic emission spectrometry with precision and limit of detection are better,choice of which may,under laboratory conditions.