CN108576552A - 一种利用聚能光电脉冲进行食品杀菌消毒的方法 - Google Patents
一种利用聚能光电脉冲进行食品杀菌消毒的方法 Download PDFInfo
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Abstract
本发明公开了一种利用聚能光电脉冲进行食品杀菌消毒的方法,采用了物理冷杀菌的方法,在强电场杀菌与聚能脉冲电场杀菌原理的基础上,辅以光触媒杀菌与强光脉冲杀菌原理,不但使能量的利用效果最大化,还在高效灭菌的同时极好的保持了食物原本的性质。
Description
技术领域
本发明涉及食品杀菌消毒技术领域,具体涉及一种利用聚能光电脉冲进行食品杀菌消毒的方法。
背景技术
现今,有效的食品杀菌保鲜是保证食品安全和延长存储时间的的重要手段。由于食品加工过程中卫生条件的不配套,同时缺乏必要保鲜手段,使得食品保鲜中产生了巨大的变质损失(据有关部门调查统计显示,我国粮食因保鲜杀菌措施不当而产生的的损失达8%~10%,水果损失25%~30%,蔬菜损失30%~40%。仅水果蔬菜的年损失价值就达750亿元),变质的食品更严重影响到消费者的身体健康。现有的传统杀菌保鲜方法存在很多不足之处:
1.限制性、局限性大。传统的杀菌消毒方法往往在沿用开始就已经决定了杀菌对象的性质,如巴氏消毒法只能用于液态食品(果汁、牛乳)、酸性食品和果酱罐头等,低温杀菌法主要适用于pH值4.5以下的酸性食品及采用较强加热处理会明显导致品质降低的食品,往往不能做到一种杀菌方法在多种性质的杀菌对象间通用。
2.时间长。传统杀菌消毒方法所用时间长短通常是以“分钟”乃至“小时”为时间单位进行计算,在流水线处理中成为影响加工效率的一大问题。
3、造成食品理化性质破坏大。如对果汁等营养价值高的食品进行传统的热杀菌处理,会剧烈加速果汁的氧化过程。同时会使维生素、氨基酸等营养物质的含量大幅降低(通常达到百分之二十以上),还会使食品中的某些物质发生反应(当牛乳加热到75℃以上时,含硫氨基酸释放出巯基,形成挥发性硫化物,从而形成“蒸煮味”),导致破坏风味,甚至影响食品安全。
4、能量利用率低,浪费能源。传统热杀菌处理的能量利用率很低,往往在热传递的过程中就已经在介质中损失了大部分能量,作用在食品上的能量占输出能量的比重往往很低,容易造成杀菌的成本增高,更会导致能源的浪费。
5、不当的杀菌方法会造成食品安全隐患。如防腐剂,在我国,食品生产中使用的防腐剂绝大多数都是人工合成的,使用不当会有一定的副作用;有些防腐剂甚至含有微量毒素,长期过量摄入会对人体健康造成一定的损害。
发明内容
本发明的目的在于克服现有技术中存在的上述问题,提供一种利用聚能光电脉冲进行食品杀菌消毒的方法,该方法可将聚能脉冲电场杀菌、聚能脉冲强光杀菌和光触媒杀菌相结合,工作效率高,杀菌效果更佳,且能将细菌或真菌释放出的毒素分解及无害化处理。
为实现上述技术目的,达到上述技术效果,本发明是通过以下技术方案实现的:
一种利用聚能光电脉冲进行食品杀菌消毒的方法,包括以下步骤:
(1)设置两面竖直且互相平行的金属极板,将金属极板连接到聚能脉冲电源上;
(2)在金属极板表面涂覆光触媒材料,在两面金属极板的正上方设置氙灯光源,将氙灯光源连接到聚能脉冲电源上;
(3)在氙灯光源上方设置聚光灯罩,聚光灯罩为弧形绝缘材料,左右两侧分别连接金属极板,聚光灯罩与两个金属极板构成一个倒U形拱桥结构,食物从倒U形拱桥结构中穿过,进行杀菌消毒。
进一步地,所述聚能脉冲电源由电源、聚能脉冲发生器和脉冲变压器组成,所述电源通过脉冲变压器,再经过聚能脉冲发生器处理后,再接入金属极板和氙灯光源。
光触媒材料是一种以纳米级二氧化钛为代表的,具有光催化功能的光半导体材料的总称,这些光触媒在紫外光线的作用下,能够产生强烈的催化降解功能,能有效地降解空气中有毒有害气体,能有效杀灭多种细菌,并能将细菌或真菌释放出的毒素分解及无害化处理。
在最初的光触媒运用中,人们对比了许多光源,最后发现,纯二氧化钛光触媒只能吸收波段为400nm以下的紫外光,这便导致了纯二氧化钛光触媒使用条件复杂,不利于利用,而现在的光触媒材料经过技术处理已经可以吸收大部分波段的光了,使得光触媒材料对日光这种全波段的自然光吸收效率最大,但由于日光的不稳定性(随时间、空间、天气等因素不停变化),故本发明采用了与日光最为接近的光谱氙灯光源,作为本发明的光源。
本发明的有益效果为:本发明采用了物理冷杀菌的方法,在强电场杀菌与聚能脉冲电场杀菌原理的基础上,辅以光触媒杀菌与强光脉冲杀菌原理,不但使能量的利用效果最大化,还在高效灭菌的同时极好的保持了食物原本的性质。
附图说明
为了更清楚地说明本发明实施例的技术方案,下面将对实施例描述所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为聚能脉冲电源的原理示意图。
图2为落射荧光显微镜下观察的大肠杆菌。
具体实施方式
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。
本发明为一种利用聚能光电脉冲进行食品杀菌消毒的方法,包括以下步骤:
(1)设置两面竖直且互相平行的金属极板,将金属极板连接到聚能脉冲电源上;
(2)在金属极板表面涂覆光触媒材料,在两面金属极板的正上方设置氙灯光源,将氙灯光源连接到聚能脉冲电源上;
(3)在氙灯光源上方设置聚光灯罩,聚光灯罩为弧形绝缘材料,左右两侧分别连接金属极板,聚光灯罩与两个金属极板构成一个倒U形拱桥结构,食物从倒U形拱桥结构中穿过,进行杀菌消毒。
进一步地,所述聚能脉冲电源由电源、聚能脉冲发生器和脉冲变压器组成,所述电源通过脉冲变压器,再经过聚能脉冲发生器处理后,再接入金属极板和氙灯光源。
实验:
实验一:检测聚能光电脉冲法杀菌的杀菌作用
样品制备:取500ml培养瓶内装LB培养基200ml,及相应抗生素。加入1%浓度大肠杆菌接种菌液,37度摇床培养100-200r/min至OD值0.6-0.8。
样品处理:用无菌接种环取少许样本,制片,用落射荧光显微镜观察细菌活性;再将涂片置于场强为30kV/cm,频率为50Hz的聚能光电脉冲杀菌装置中进行处理;最后将涂片再次置入落射荧光显微镜中,观察活性;
结果与分析:大肠杆菌经场强为30kV/cm,频率为50Hz的聚能光电脉冲法杀菌装置的30个脉冲处理后,细菌活性较处理前降低了60%以上,再次处理后,99%以上致死。可知,光电脉冲法能够高效使大肠杆菌灭活。
实验二:探究光电脉冲法杀菌对不同种类食品的保鲜效果差异
样品制备:准备四种不同种类的食品(面包、米粉、猪肉、肉汤),并各取等量分为20组,编号;并将为同种食材的四组样品置入电场强度30kV/cm,频率为50Hz的聚能光电脉冲杀菌装置中进行杀菌处理,处理时间分别为不处理、5s、 10s、15s、20s;
样品处理:20组样品处理完毕后置入细菌培养箱中以28℃,80%的湿度培养,并同步观察,记录样品变质发霉所需的时间。
实验现象:
表-不同种类食品处理时间与食物变质时间的关系
结果与分析:对于不同种类的食物,聚能光电脉冲杀菌均有良好的杀菌保鲜效果,且随着处理时间延长,均能有效的使食品保鲜时间延长。可知,无论在哪一种的食品杀菌保鲜中,聚能光电脉冲杀菌均有极高的利用价值,可代替现存的食品杀菌方法。
实验三:聚能光电脉冲法杀菌在不同食品杀菌中的应用研究
(1)聚能光电脉冲法杀菌对脱脂乳杀菌的研究
将未经处理的脱脂乳、热杀菌处理后的脱脂乳与聚能光电脉冲法杀菌处理后的脱脂乳进行对比:
①感官评定没有任何区别
②pH值、维生素A质量分数、乳糖质量分数、蛋白质质量分数均无明显差距
③仅有维生素C含量减少12%
(2)聚能光电脉冲法杀菌对苹果汁杀菌的研究
将未经处理的苹果汁、热杀菌处理后的苹果汁与聚能光电脉冲法杀菌处理后的脱脂乳进行对比:
①脉冲电场对新鲜苹果汁的理化指标影响不大,基本保持了原有的色泽和风味,维生素C的损失不到8%
②轻微加速了苹果汁氧化过程,但远小于热杀菌处理
(3)聚能光电脉冲法杀菌对绿茶杀菌的研究
将未经处理的绿茶、热杀菌处理后的绿茶与聚能光电脉冲法杀菌处理后的绿茶进行对比:
经聚能光电脉冲法杀菌处理后,绿茶的茶多酚、氨基酸含量和色泽等相对于之前没有发生明显变化,综合杀菌效果说明聚能光电脉冲法杀菌不仅能够使绿茶饮料达到检测无菌的水平,还可以保持其原有品质。
(4)聚能光电脉冲法杀菌对干、湿米粉的研究
将未经处理的干、湿米粉,热杀菌处理的干、湿米粉与聚能光电脉冲法杀菌处理的干、湿米粉进行对比:
①聚能光电脉冲法杀菌处理后的干、湿米粉相对于热杀菌处理的干、湿米粉来说保留了良好的口感与色泽、风味
②聚能光电脉冲法杀菌处理后的干、湿米粉中,对湿米粉的杀菌效果要大于对干米粉的杀菌效果
由以上应用的探究可知,聚能光电脉冲法杀菌在各种类型的食品杀菌中,均起到了优良的效果。不同于传统的常规杀菌,聚能光电脉冲法杀菌不但使能耗降低到传统杀菌的千分之一,耗时减少到传统杀菌的万分之一,更使食品的风味、营养价值等得到完好的保存,这对于未来的食品保鲜杀菌有着极大的应用价值。
聚能光电脉冲法杀菌是一种全新的物理冷杀菌方法,这种方法大程度上解决了过去技术的不足及局限性。由于其杀菌机理是以强电场杀菌、聚能脉冲电场杀菌原理为基础,辅以光触媒杀菌与强光脉冲杀菌原理,所以这种杀菌方法全程具有温度低(最高温度低于50℃)、能耗低、杀菌时间短等优点,可以使食物的新鲜度及营养价值等得到很好的保存。在食品安全问题愈发严重的今天,这样一种具有极大优势的杀菌方法必有极大的利用价值和广阔的应用前景。相信无论是在冰箱保鲜、超市酒店、食品仓储还是食品运输乃至军事方面,这种高效节能的杀菌保鲜方法都能给人们的生活带来极大的便利。
以上公开的本发明优选实施例只是用于帮助阐述本发明。优选实施例并没有详尽叙述所有的细节,也不限制该发明仅为所述的具体实施方式。显然,根据本说明书的内容,可作很多的修改和变化。本说明书选取并具体描述这些实施例,是为了更好地解释本发明的原理和实际应用,从而使所属技术领域技术人员能很好地理解和利用本发明。本发明仅受权利要求书及其全部范围和等效物的限制。
Claims (2)
1.一种利用聚能光电脉冲进行食品杀菌消毒的方法,其特征在于,该方法包括以下步骤:
(1)设置两面竖直且互相平行的金属极板,将金属极板连接到聚能脉冲电源上;
(2)在金属极板表面涂覆光触媒材料,在两面金属极板的正上方设置氙灯光源,将氙灯光源连接到聚能脉冲电源上;
(3)在氙灯光源上方设置聚光灯罩,聚光灯罩为弧形绝缘材料,左右两侧分别连接金属极板,聚光灯罩与两个金属极板构成一个倒U形拱桥结构,食物从倒U形拱桥结构中穿过,进行杀菌消毒。
2.根据权利要求1所述的一种利用聚能光电脉冲进行食品杀菌消毒的方法,其特征在于:所述聚能脉冲电源由电源、聚能脉冲发生器和脉冲变压器组成,所述电源通过脉冲变压器,再经过聚能脉冲发生器处理后,再接入金属极板和氙灯光源。
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