| At present about nuts Chaohuo food on acid value, peroxide value testing method has many are not unified, and the other containing oil acid value, peroxide value of food detection of oil extraction are based on GB / T5009.56 cakes" method for analysis of hygienic standard of" 4.2.1:" grease containing high sample, such as walnut and other weighing homogeneous sample 50g, on the 250ml Plug Taper bottle, plus 50ml petroleum ether ( boiling range: 30 C 60 C ), placed overnight, with rapid filter, vacuum recovery of solvent oil for determination of acid value, get, peroxide value, with" GB19300" carbonado fry food hygiene standards" and GB16326" Hygienic standard for nut" have their own set of pretreatment of sample, and exactly as described:" take appropriate sample of edible part, after crushing in cork triangle bottle, plus 30 degrees 60 C petroleum ether 100ml, shake 1min after placement by night, filled with anhydrous sodium sulfate funnel filter, the filtrate into 60 DEG C in a water bath, volatile as petroleum ether, in preparation for. Extraction of oil quantity should meet GB / T5009.37 method for the determination of requirements". The essential difference between both is GB / T5009.56 petroleum ether content 50ml and recovering, short process, as long as 2030 minutes, while GB19300 and GB16326 petroleum ether content 100ml, and 60 degrees C water bath and pressure recovery, time is long, sometimes need to 34 hours, or even longer. |
