超强防腐剂助食物长久保鲜
<p>美国明尼苏达大学的微生物学家近期发现了一种超强天然防腐剂，能够杀灭各类细菌，使食物在常温下也能保存很久。据悉，这种防腐剂名叫“比辛”，是从一些无害细菌中自然产生的。这种防腐剂能够阻止肉、鱼、蛋和奶制品腐坏，对已开启的红酒和沙拉酱也同样有效。添加了这种天然防腐剂的食品甚至不需要放入冰箱，在常温下就可以保质数年。不过，由于蔬菜和水果的机能不同，该防腐剂不能对其起到保鲜作用。研究人员表示，这种天然防腐剂比之前的任何一种都要好，因为它不会破坏食物的营养成分，也没有任何化学成分被添加到食品当中，它只是一种天然成分。目前，研究人员已经在美国为“比辛”申请了专利。添加了“比辛”的牛奶、香肠及三明治等产品有望在三年内上市。</p><p><span word="Fresh">Fresh</span> <span word="food">food</span> <span word="could">could</span> <span word="be">be</span> <span word="made">made</span> <span word="to">to</span> <span word="last">last</span> <span word="for">for</span> <span word="years">years</span> <span word="after">after</span> <span word="scientists">scientists</span> <span word="discovered">discovered</span> <span word="a">a</span> <span word="natural">natural</span> <span word="preservative">preservative</span> <span word="capable">capable</span> <span word="of">of</span> <span word="destroying">destroying</span> <span word="a">a</span> <span word="whole">whole</span> <span word="class">class</span> <span word="of">of</span> <span word="bacteria">bacteria</span>, <span word="including">including</span> <span word="E">E</span>.<span word="coli">coli</span> <span word="and">and</span> <span word="listeria">listeria</span>.</p><p><span word="There">There</span> <span word="would">would</span> <span word="also">also</span> <span word="be">be</span> <span word="no">no</span> <span word="need">need</span> <span word="to">to</span> <span word="refrigerate">refrigerate</span> <span word="produce">produce</span> <span word="treated">treated</span> <span word="with">with</span> <span word="the">the</span> <span word="preservative">preservative</span>, <span word="called">called</span>, <span word="bisin">bisin</span>, <span word="which">which</span> <span word="is">is</span> <span word="produced">produced</span> <span word="by">by</span> <span word="harmless">harmless</span> <span word="bacteria">bacteria</span>.</p><p><span word="They">They</span> <span word="say">say</span> <span word="that">that</span> <span word="foods">foods</span> <span word="like">like</span> <span word="milk">milk</span>, <span word="sausages">sausages</span> <span word="and">and</span> <span word="sandwiches">sandwiches</span> <span word="containing">containing</span> <span word="the">the</span> <span word="agent">agent</span> <span word="could">could</span> <span word="be">be</span> <span word="on">on</span> <span word="the">the</span> <span word="shelves">shelves</span> <span word="within">within</span> <span word="three">three</span> <span word="years">years</span>.</p><p><span word="Ready">Ready</span> <span word="meals">meals</span>, <span word="opened">opened</span> <span word="wine">wine</span> <span word="and">and</span> <span word="fresh">fresh</span> <span word="salad">salad</span> <span word="dressing">dressing</span> <span word="could">could</span> <span word="also">also</span> <span word="be">be</span> <span word="safely">safely</span> <span word="consumed">consumed</span> <span word="long">long</span> <span word="after">after</span> <span word="they">they</span> <span word="were">were</span> <span word="bought">bought</span>, <span word="say">say</span> <span word="scientists">scientists</span>.</p>
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