Protein is the groovy nutrition index that measures surely when appraisal feed quality. The standard method that at present feed mill uses generally still is triumphant family name decides azotic way character actually, but because crude protein determines the process is opposite more complex, business of a lot of feed is detecting actually should appear in the process do not know how to analyse; when the result is unusual some unit process of cargo bandling are not close, bring about detect the result is not accurate, to production the enterprise causes a loss. The author carries out experience according to his, summed up feed crude protein to determine a few item that accuracy should notice.
Triumphant family name decides the fundamental sample of azotic law to be below the existence of activator, boil with vitriolic disappear decompose, the ammonium sulphate of azotic translate into that makes protein etc compound medium, ammonium sulphate is in thick alkaline action transfer to a lower level gives ammonia to enrage, pass distillation, ammoniac gas flows into boric acid solution down condensation canal along with soda water, written guarantee synthesis is ammonium of 4 boric acid to it, with titrate of solution of hydrochloric acid standard, can determine the ammoniac nitrogen amount that emit. According to azotic quantity, multiply with specific coefficient, it is commonly 6.25, can reach content of the crude protein in sample.
The Ying Zaikai when the item that the attention answers in unit process of cargo bandling is digested adds a few glass bead in family name bottle, when be being digested in case vitriolic cruel boil liquid is splashed break, and in upper cover of opening of triumphant family name one small funnel makes vapour condenses circumfluence, such meetings make digest complete.
Begin to digest should use small internal heat, wait for sample cooking, after bubble disappears, progressively and slow strengthen firepower, often turn in digestive process bottle of triumphant family name, will splash bottle of mural black broken bits all immerge inside the vitriolic solution of bottom of flask of triumphant family name, digest in order to avoid not complete. Good temperature should be controlled when digesting, 380 ℃ are better, too small digestive time is long, and not complete; is exorbitant the loss that can cause nitrogen. Because electric stove is bad to control temperature, had better use adjustable the electric stove that electric stove or power are 800w.
Digestive juice is achieved transparent be not show sample has been digested complete, determine to prevent result on the low side, need adds hot complement to digest at least 2 hours further.
After sample stops to heat, cause vitriolic appearance fluid if cooling time is too long easily to condense to dissolve not easily (especially seasonal in the winter) , when refrigeration comes not to warm a hand, reason should add a few distilled water (about 20 milliliter) , jolty bottle of triumphant family name, in transferring capacity bottle, cooling, calm look. But the severe reaction that should notice water and heat are vitriolic, lest burst of bottle of triumphant family name.
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