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甘薯淀粉加工工艺
(1) 破碎:将新收获的甘薯用清水洗净,沥干水分,用甘薯淀粉机破碎成直径2厘米的碎块。(2) 过滤:将鲜薯片放入石磨或金钢磨中加水磨成薯浆,然后用60目以上的筛子过筛,过筛时用水或酸浆水洗滤。(3) 混合与撇沫:调整淀粉乳浓度,使pH值为3.6-4.0,加入酸浆,用量约为淀粉乳的2%,使淀粉乳pH值达到5.6,静置20-30分钟,使淀粉沉淀,然后撇去上层泔水。(4) 坐缸与撇沫:撇沫后,底部淀粉加水混合成淀粉乳,使淀粉再次沉淀。沉淀过程中淀粉起酸奶发酵作用,故称坐缸。缸温要求约20℃,时间24小时。发酵过程中适当搅拌,使发酵完成。发酵结束后,撇出上层酸奶用于下次混合,撇沫后的淀粉用120目细筛过滤。(5) 冲洗:将过筛的淀粉用水冲洗约24小时,防止发酵。(6) 粉碎:淀粉沉淀后,撇去上层水浆,用水洗去表面油粉,用铲子取出底部淀粉,去除底部沉积物。(7) 干燥与包装:提取的淀粉在瓢中沥水,沥干后晒干或烘干。干燥后用尼龙/聚丙烯或聚醋酸乙烯/聚乙烯复合膜密封包装。

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