主講教師：孫敏e7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF5424729F73D702B10A37F6752540CD24382CCB0C600C251FB3595317AE385665507460FCA30D310773D37E387F1670650046EA40803BC1047A9F7黑木耳的摻偽檢驗(yàn)主講教師：孫敏e7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF54247A2055AECC4CE6D58CD94F8E4FC62C4D4F76B6FB9024C5B91C3BA3CB21B14791C30FBC5210D3C52083BD1D75B2FBD63FF163BE518A3C134F4案例分析增重黑木耳??！目錄黑木耳的摻偽類(lèi)型黑木耳的摻偽檢驗(yàn)e7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF54247A2055AECC4CE6D58CD94F8E4FC62C4D4F76B6FB9024C5B91C3BA3CB21B14791C30FBC5210D3C52083BD1D75B2FBD63FF163BE518A3C134F4黑木耳的摻偽類(lèi)型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黑木耳中常見(jiàn)的摻偽類(lèi)型：摻入面粉摻入白糖摻入淀粉摻入硫酸鎂摻入沙子摻入色素等。黑木耳的摻偽類(lèi)型黑木耳的摻偽檢驗(yàn)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黑木耳的摻偽檢驗(yàn)（1）色澤耳面烏黑有光澤，耳背灰白的為佳品。耳面萎黑無(wú)光澤為次品。耳面灰黑呈褐色的為劣品。如耳內(nèi)外面均發(fā)黑或?yàn)樽睾稚嬗邪姿蚍蹱钗锏臑閾教腔驌搅蛩徭V的假貨。（2）朵形朵大整齊舒展、體輕、水發(fā)脹性好的為優(yōu)質(zhì)品。朵小、耳卷、體重的為次品。朵碎不重、體重、質(zhì)硬的為摻假品。（3）組織質(zhì)脆易折斷、松散、個(gè)體分散好、組織紋理清晰的為優(yōu)質(zhì)品。手感韌硬，表面有粉末，分散性差，有黏結(jié)現(xiàn)象的為摻假品。（4）味道真品無(wú)澀、無(wú)味，氣味微香。摻糖的有甜味;摻食鹽的有咸味;摻硫酸鎂的有苦味;摻礬硝溶液的有澀感感官鑒別e7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF54247A2055AECC4CE6D58CD94F8E4FC62C4D4F76B6FB9024C5B91C3BA3CB21B14791C30FBC5210D3C52083BD1D75B2FBD63FF163BE518A3C134F4黑木耳的摻偽檢驗(yàn)吸水量試驗(yàn)正常木耳：吸水量≥10ml/g具體操作：取檢樣5g，加入200mL50℃水，攪拌后于室溫下放置30min，將浸泡液倒入量筒中，計(jì)算吸水的體積。

V＝（V1-V2）/me7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF54247A2055AECC4CE6D58CD94F8E4FC62C4D4F76B6FB9024C5B91C3BA3CB21B14791C30FBC5210D3C52083BD1D75B2FBD63FF163BE518A3C134F4黑木耳的摻偽檢驗(yàn)化學(xué)試驗(yàn)檢驗(yàn)的對(duì)象：鐵粉、淀粉、糖、食鹽、鹽鹵（硫酸鎂）、明礬、碳酸鹽、含氮化肥的檢驗(yàn)。e7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF54247A2055AECC4CE6D58CD94F8E4FC62C4D4F76B6FB9024C5B91C3BA3CB21B14791C30FBC5210D3C52083BD1D75B2FBD63FF163BE518A3C134F4黑木耳的摻偽檢驗(yàn)鐵粉檢驗(yàn)取濾紙上的殘?jiān)僭S于試管中，加稀鹽酸，微沸，加水和硫氰酸胺晶粒，搖勻，如顯紅色，表示有鐵存在。e7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF54247A2055AECC4CE6D58CD94F8E4FC62C4D4F76B6FB9024C5B91C3BA3CB21B14791C30FBC5210D3C52083BD1D75B2FBD63FF163BE518A3C134F4黑木耳的摻偽檢驗(yàn)摻淀粉檢驗(yàn)淀粉遇碘變藍(lán)色，如變藍(lán)色，則可認(rèn)為摻假木耳中有淀粉存在。e7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF54247A2055AECC4CE6D58CD94F8E4FC62C4D4F76B6FB9024C5B91C3BA3CB21B14791C30FBC5210D3C52083BD1D75B2FBD63FF163BE518A3C134F4黑木耳的摻偽檢驗(yàn)摻糖檢驗(yàn)1.a-萘酚反應(yīng)：正常為草綠色環(huán)，摻糖為紫紅色化合物。2.蒽酮反應(yīng)：正常的黑木耳為淺綠色，摻糖的為藍(lán)綠色化合物。3.快速定量檢驗(yàn)：通過(guò)不同濃度的含糖溶液具有不同的折射率進(jìn)行測(cè)定。e7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF54247A2055AECC4CE6D58CD94F8E4FC62C4D4F76B6FB9024C5B91C3BA3CB21B14791C30FBC5210D3C52083BD1D75B2FBD63FF163BE518A3C134F4黑木耳的摻偽檢驗(yàn)摻食鹽檢驗(yàn)氯離子與銀離子反應(yīng)生成白色氯化銀沉淀，此沉淀不溶于任何酸而溶于氨水。e7d195523061f1c0c2b73831c94a3edc981f60e396d3e182073EE1468018468A7F192AE5E5CD515B6C3125F8AF6E4EE646174E8CF0B46FD19828DCE8CDA3B3A044A74F0E769C5FA8CB87AB6FC303C8BA3785FAC64AF54247A2055AECC4CE6D58CD94F8E4FC62C4D4F76B6FB9024C5B91C3BA3CB21B14791C30FBC5210D3C52083BD1D75B2FBD63FF163BE518A3C134F4黑木耳的摻偽檢驗(yàn)摻鹽鹵檢驗(yàn)鹽鹵的化學(xué)組成為硫酸鎂、氯化鎂等，摻鹽鹵的黑木耳口嘗苦咸，質(zhì)地堅(jiān)硬?？蓹z驗(yàn)鎂離子和硫酸根離子、氯離子。如果3種離子都檢出為陽(yáng)性，則說(shuō)明黑木耳中摻有鹵水。主講教師：孫敏e7d195523061f1c0c2b73831c94a3