(相关资料图)
1、清理。去除皮上的残肉、粪便、泥土、脂肪等无用部分。
2、防腐。基本原则是去水、低温和利用防腐剂抑制微生物和酶的作用。干燥法:一般采用自然晾干,把鲜皮肉面向外用数根竹竿撑开,放在通风荫棚下晾晒至含水量15%以下即可,以利防腐。
3、盐腌法:干盐腌法。用牛皮重25%-30%的干盐均匀地撒布在肉面上,使皮内失去水分,达到防腐目的。为了提高保藏效果,可在干盐内加入盐重1%-1.5%的对氯二苯和2%-3%的萘。腌后6-8天牛皮的内外盐浓度达到平衡。盐水淹法。将生皮浸入25%食盐水溶液池内,水温保持15℃。24小时后取出,沥水2小时,再撒入牛皮重25%的干盐。为了防止盐斑,可在盐中加入盐重4%的碳酸钠。盐干法。即先盐腌,再干燥至含水20%,此法的优点是防腐力强,能避免生皮干燥时发生硬化,断裂等缺陷,并使贮藏期延长。
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