CN107821571A - 一种对虾的低温等离子体活化冰保藏方法 - Google Patents
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Abstract
本发明公开了一种对虾的低温等离子体活化冰保藏方法,先制备低温等离子体活化水,将活化水置于‑20℃冰箱中制成活化冰,然后用低温等离子体活化冰代替普通冰,并采用层冰层虾的贮藏方式保鲜对虾。本发明的保鲜方法具有显著的杀菌和抑菌作用,大大降低了菌落总数,并降低了挥发性盐基氮的产生,可有效延长对虾的保鲜期。
Description
技术领域
本发明属于水产保鲜技术领域,具体涉及一种对虾的低温等离子体活化冰保藏方法。
背景技术
对虾营养成分丰富,水分含量高,在加工、贮藏、运输、销售过程中容易受微生物的污染而导致其腐败变质。因此,人们通常利用冰将其温度维持在0℃左右的低温环境中,冰鲜可以抑制微生物生长和生化反应速率,同时能最大限度地保持食品原有的风味和营养。但由于冰鲜技术对水产品保鲜期的限制,因此近年来常出现不合理使用化学防腐剂对水产品的品质保鲜的食品安全事件。化学防腐剂的不合理使用,使得水产安全卫生问题成了人们关注的焦点,因此,开发一种新型环保安全的水产品保鲜技术具有十分重要的现实意义。
发明内容
本发明提供一种对虾的低温等离子体活化冰保藏方法,具有显著的杀菌和抑菌作用,大大降低了菌落总数,并降低了挥发性盐基氮的产生,可有效延长对虾的保鲜期。
一种对虾的低温等离子体活化冰保藏方法,包括如下步骤:
制备低温等离子体活化水,将低温等离子体活化水置于-20℃冰箱中制成活化冰然后用低温等离子体活化冰保险对虾。
本发明先制备低温等离子体活化水,将活化水置于-20℃冰箱中制成活化冰,然后用低温等离子体活化冰代替普通冰,并采用层冰层虾的贮藏方式保鲜对虾。
优选地,所述低温等离子体活化水的理化参数为:pH为2.95~3.0,电导率为420~430us/cm,氧化还原电位为315~320mv,过氧化氢含量为39~40uM。
由低温等离子体装置制备,制备条件为:处理频率为10~12kHz,处理气隙间距为5~6mm,处理功率为28~32W,处理时间为10~12min,处理温度为室温。
进一步优选地,所述低温等离子体活化水的理化参数为:pH为2.98,电导率为427us/cm,氧化还原电位为319mv,过氧化氢含量为39.4uM。
制备条件为:处理频率为10kHz,处理气隙间距为5mm,处理功率为30W,处理时间为10min,处理温度为25℃。
低温等离子体装置(南京苏曼等离子体科技有限公司)对水进行处理制备低温等离子体活化水,具体步骤:将水装入石英培养皿中,将培养皿放于两电极之间,对水进行低温等离子体处理,处理频率为10kHz,处理气隙间距为5mm,处理功率为30W,处理时间为10min,处理温度为室温25℃,以空气为放电气体,得到低温等离子体活化水。
优选地,保险对虾采用层鱼层冰的方式置于泡沫箱中。
进一步优选地,将所述泡沫箱置于18~22℃环境条件下贮存并每隔10~12h更换一次冰。
更进一步优选地,将所述泡沫箱置于20℃环境条件下贮存并每隔12h更换一次冰。
在低温等离子体活化冰保鲜对虾后,还包括以下步骤:检测经过低温等离子体活化冰贮藏后的对虾的菌落总数和挥发性盐基氮值。菌落总数的测定采用平板计数法,根据半微量凯氏定氮原理测量挥发性盐基氮值。
本发明的实验证明,本发明开发了一种对虾的低温等离子体活化冰保藏方法。本发明先利用低温等离子体装置制备出低温等离子体活化水,将活化水置于-20℃冰箱中制成活化冰,然后用低温等离子体活化冰代替普通冰保鲜对虾。
本发明的方法具有显著的杀菌和抑菌作用,大大降低了菌落总数,并降低了挥发性盐基氮的产生,可有效延长对虾的保鲜期。经过低温等离子体活化冰贮藏的对虾在5天后菌落总数为5.59±0.34logCFU/g,而经过普通冰贮藏的对虾在5天后菌落总数达到7.52±0.86logCFU/g;经过低温等离子体活化冰贮藏的对虾在5天后挥发性盐基氮的含量为24.05±1.2mg/kg,而经过普通冰贮藏的对虾在5天后菌落总数达到62.0±3.7mg/kg。由此可见,本发明的方法能够具有显著的杀菌和抑菌作用,并大大降低了挥发性盐基氮的产生,可有效延长对虾的保鲜期。
附图说明
图1是不同冰处理后对虾菌落总数随时间的变化情况。
图2是不同冰处理后对虾挥发性盐基氮含量随时间的变化情况。
具体实施方式
下面结合实施例对本发明作进一步详细的描述,但本发明的实施方式不限于此。
实施例1
一、低温等离子体活化水的制备
用低温等离子体发生装置(南京苏曼等离子体科技有限公司)对普通水溶液进行处理,具体步骤:将水装入石英培养皿中,将培养皿放于两电极之间,对其进行低温等离子体处理,处理频率为10kHz,处理气隙间距为5mm,处理功率为30W,处理时间为10min,处理温度为室温25℃,以空气为放电气体,得到低温等离子体活化水。
二、低温等离子体活化冰和普通冰的制备
将低温等离子体活化水立即密封置于-20℃冰箱中冻结成冰,得到低温等离子体活化冰。普通水采用上述相同条件制备成普通冰。
三、贮藏
实验组采用等离子体活化冰层冰层虾的贮藏方式保鲜对虾,对照组采用普通冰层冰层虾的贮藏方式保鲜对虾,样品处理好后于20℃环境条件下贮存并每隔12h换一次冰,实验每隔两天测定对虾的菌落总数和挥发性盐基氮值。
四、检测
(1)可培养菌数测定方法
采用平板计数法:具体步骤:参照GB 4789.2-2010方法,将虾肉研磨并用0.85%无菌生理盐水进行梯度稀释,取稀释样1mL于灭菌平皿中,倒入约20mL PCA培养基摇匀,待培养基凝固后倒置于37℃培养箱中培养24h,然后记录菌落数。
(2)挥发性盐基氮测定方法
采用半微量凯氏定氮法,具体步骤:参照GB 5009.228-2016方法,①将试样除去脂肪、壳后绞碎拌匀,称取10g于锥形瓶加水100ml,不时振摇,30min后过滤留滤液置冰箱备用;②将盛有10ml吸收液及5-6滴指示液的锥形瓶置于冷凝管下方,并使下端插入液面以下,准确称取5ml滤液于蒸馏反应室,加5ml氧化镁悬浮液,迅速盖塞,并加水放漏气,通入蒸汽蒸馏5min,用盐酸滴定液滴定至终点成紫色。
结果如图1,2所示:经过低温等离子体活化冰贮藏的对虾在5天后菌落总数为5.59±0.34logCFU/g,而经过普通冰贮藏的对虾在5天后菌落总数达到7.52±0.86logCFU/g;经过低温等离子体活化冰贮藏的对虾在5天后挥发性盐基氮的含量为24.05±1.2mg/kg,而经过普通冰贮藏的对虾在5天后菌落总数达到62.0±3.7mg/kg。由此可见,本发明的方法能够具有显著的杀菌和抑菌作用,并大大降低了挥发性盐基氮的产生,可有效延长对虾的保鲜期。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (9)
1.一种对虾的低温等离子体活化冰保藏方法,其特征在于,包括如下步骤:
制备低温等离子体活化水,将低温等离子体活化水制成低温等离子体活化冰,然后用低温等离子体活化冰保险对虾。
2.根据权利要求1所述低温等离子体活化冰保藏方法,其特征在于,将低温等离子体活化水置于-20℃冰箱中制成低温等离子体活化冰。
3.根据权利要求1所述低温等离子体活化冰保藏方法,其特征在于,所述低温等离子体活化水的理化参数为:pH为2.95~3.0,电导率为420~430us/cm,氧化还原电位为315~320mv,过氧化氢含量为39~40uM。
4.根据权利要求3所述低温等离子体活化冰保藏方法,其特征在于,所述低温等离子体活化水的理化参数为:pH为2.98,电导率为427us/cm,氧化还原电位为319mv,过氧化氢含量为39.4uM。
5.根据权利要求1所述低温等离子体活化冰保藏方法,其特征在于,所述低温等离子体活化水由低温等离子体装置制备,制备条件为:处理频率为10~12kHz,处理气隙间距为5~6mm,处理功率为28~32W,处理时间为10~12min,处理温度为室温。
6.根据权利要求5所述低温等离子体活化冰保藏方法,其特征在于,所述低温等离子体活化水由低温等离子体装置制备,制备条件为:处理频率为10kHz,处理气隙间距为5mm,处理功率为30W,处理时间为10min,处理温度为25℃。
7.根据权利要求1所述低温等离子体活化冰保藏方法,其特征在于,保险对虾采用层鱼层冰的方式置于泡沫箱中。
8.根据权利要求7所述低温等离子体活化冰保藏方法,其特征在于,将所述泡沫箱置于18~22℃环境条件下贮存并每隔10~12h更换一次冰。
9.根据权利要求8所述低温等离子体活化冰保藏方法,其特征在于,将所述泡沫箱置于20℃环境条件下贮存并每隔12h更换一次冰。
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Cited By (4)
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