CN112586651A - 一种纳豆的保鲜方法 - Google Patents
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Abstract
本发明提供了一种纳豆的保鲜方法,以解决现有技术中成品纳豆在冷藏(‑4~0℃)条件下保存保质期短的技术问题。它包括下述步骤:(1)向成品纳豆喷涂生物复配保鲜剂;(2)向经过步骤(1)处理后的成品纳豆喷涂可食性涂膜复配保鲜剂;(3)将经过步骤(2)处理后的成品纳豆进行气调包装;(4)将步骤(3)包装后的成品纳豆进行低温等离子体杀菌,然后置于‑4~0℃贮藏。本发明的纳豆的保鲜方法,能在保证纳豆原有品质和风味的基础上,能将纳豆冷藏保质期由14天提升至60天。
Description
技术领域
本发明属于食品加工技术领域,具体涉及一种纳豆的保鲜方法。
背景技术
纳豆是黄豆通过纳豆菌(枯草杆菌)发酵而制成风味浓郁、营养丰富的一类豆制品,富含维生素K2、多种生理活性物质,具有溶解体内纤维蛋白及其他调节生理机能的保健作用。
纳豆的贮藏方式以冷冻(-18℃)和冷藏(0~-4℃)为主,其中冷藏具有风味纯正、口感良好、商业化运作耗能低等特点收到市场的青睐。但是,纳豆在低温贮藏和运输的过程中极易被腐败微生物污染,导致蛋白质、碳水化合物、脂肪等营养成分氧化变质。在现有技术条件下,冷藏纳豆保质期仅为14天左右,严重限制了纳豆的产业化提升。
发明内容
本发明的目的在于提供一种纳豆的保鲜方法,以解决现有技术中成品纳豆在冷藏(-4~0℃)条件下保存保质期短的技术问题。本发明提供的诸多技术方案中的优选技术方案所能产生的诸多技术效果详见下文阐述。
为实现上述目的,本发明提供了以下技术方案:
本发明提供的一种纳豆的保鲜方法,包括下述步骤:
(1)向成品纳豆喷涂生物复配保鲜剂;所述生物复配保鲜剂的原料包括乳酸链球菌素和纳他霉素;具体使用时,是将生物复配保鲜剂和水按重量比1:80-100进行混匀,然后喷涂在成品纳豆表面;生物复配保鲜剂的使用量为成品纳豆重量的0.2%-0.4%;
(2)向经过步骤(1)处理后的成品纳豆喷涂可食性涂膜复配保鲜剂;所述可食性涂膜复配保鲜剂的原料包括改性海藻酸钠、羟甲基纤维素钠和明胶;具体使用时,是将可食性涂膜复配保鲜剂和水按重量比1:80-100进行混匀,然后喷涂在经过步骤(1)处理后的成品纳豆表面;可食性涂膜复配保鲜剂的使用量为成品纳豆重量的1%-2%;
(3)将经过步骤(2)处理后的成品纳豆进行气调包装;
(4)将步骤(3)包装后的成品纳豆进行低温等离子体杀菌,然后置于-4~0℃贮藏。
进一步的,所述步骤(1)中,所述生物复配保鲜剂的制备各原料的重量份分别为:乳酸链球菌素2~3份,纳他霉素1~2份。
进一步的,所述生物复配保鲜剂的制备各原料的重量份分别为:乳酸链球菌素2.5份,纳他霉素1.7份。
进一步的,所述步骤(2)中,所述可食性涂膜复配保鲜剂的制备各原料的重量份分别为:改性海藻酸钠4~5份,羟甲基纤维素钠1~3份,明胶2~3份。
进一步的,所述可食性涂膜复配保鲜剂的制备各原料的重量份分别为:改性海藻酸钠4.1份,羟甲基纤维素钠1.4份,明胶2.5份。
进一步的,所述步骤(3)中,气调包装时,所述氮气:氧气:二氧化碳的体积比为70~75:3~5:15~20。
进一步的,所述氮气:氧气:二氧化碳的体积比为72:3.5:17。
进一步的,所述步骤(4)中,所述低温等离子体杀菌采用的是介质阻挡放电DBD等离子体发生装置进行杀菌;电压为50~70kV,处理时间为60~150s。
进一步的,所述电压为55kV,处理时间为85s。
进一步的,所述步骤(1)、(2)、(3)和(4)均在10万级超洁净车间进行。
基于上述技术方案,本发明实施例至少可以产生如下技术效果:
本发明提供的一种纳豆的保鲜方法,本发明中采用的生物复配保鲜剂通过乳酸链球菌素、纳他霉素两种生物抑菌素的复配技术,实现一定程度的抑菌作用;本发明中采用的可食性涂膜复配保鲜剂采用改性海藻酸钠、明胶和羟甲基纤维素钠的亲水胶体复配技术,应用其良好的延展性,通过在纳豆表层形成一层可食性保鲜膜,在一定程度上实现纳豆抗氧化和抑菌的功能;本发明采用氧气、二氧化碳、氮气合适的浓度配比,通过调整腐败微生物的呼吸作用,抑制代谢,从而延长纳豆架期,提升产品价值;本发明通过等离子冷杀菌技术,以O2和N2为工作气体,经高压电场作用后,包装盒内会产生O3、NOx、电子、瞬时自由基等多种活性物质的集合,实现瞬时杀菌活性物质;本发明通过采用生物复配保鲜剂(天然生物抑菌剂技术)、可食性涂膜复配保鲜剂(亲水胶体复配技术)、气调保鲜技术及等离子体冷杀菌四大技术相结合、相互作用,通过阻隔外界污染、调制腐败微生物呼吸、多种活性物质集合杀菌三大原理,在保证纳豆原有品质和风味的基础上,能将冷藏保质期由14天提升至60天。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚,下面将对本发明的技术方案进行详细的描述。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做出创造性劳动的前提下所得到的所有其它实施方式,都属于本发明所保护的范围。
一、实施例
下述实施例1-3和对比例1均在在10万级超洁净车间进行纳豆的保鲜。
实施例1:
一种纳豆的保鲜方法,包括下述步骤:
(1)向成品纳豆喷涂生物复配保鲜剂;将生物复配保鲜剂和水按重量比1:90进行混匀,然后喷涂在成品纳豆表面;生物复配保鲜剂的使用量为成品纳豆重量的0.3%;
所述生物复配保鲜剂的制备包括下述重量份的原料:乳酸链球菌素2份、纳他霉素2份;
(2)向经过步骤(1)处理后的成品纳豆喷涂可食性涂膜复配保鲜剂;将可食性涂膜复配保鲜剂和水按重量比1:90进行混匀,然后喷涂在经过步骤(1)处理后的成品纳豆表面;可食性涂膜复配保鲜剂的使用量为成品纳豆重量的1.5%;
所述可食性涂膜复配保鲜剂的制备包括下述重量份的原料:改性海藻酸钠4份、羧甲基纤维素钠1份、明胶3份;
(3)将经过步骤(2)处理后的成品纳豆进行气调包装;气调包装时,所述氮气:氧气:二氧化碳的体积比为70:3:15;
(4)将步骤(3)包装后的成品纳豆采用介质阻挡放电DBD等离子体发生装置进行低温等离子体杀菌,电压为70kV,处理时间为60s,然后置于-4℃贮藏。
实施例2:
一种纳豆的保鲜方法,包括下述步骤:
(1)向成品纳豆喷涂生物复配保鲜剂;将生物复配保鲜剂和水按重量比1:80进行混匀,然后喷涂在成品纳豆表面;生物复配保鲜剂的使用量为成品纳豆重量的0.4%;
所述生物复配保鲜剂的制备包括下述重量份的原料:乳酸链球菌素2.5份、纳他霉素1.7份;
(2)向经过步骤(1)处理后的成品纳豆喷涂可食性涂膜复配保鲜剂;将可食性涂膜复配保鲜剂和水按重量比1:100进行混匀,然后喷涂在经过步骤(1)处理后的成品纳豆表面;可食性涂膜复配保鲜剂的使用量为成品纳豆重量的1%;
所述可食性涂膜复配保鲜剂的制备包括下述重量份的原料:改性海藻酸钠4.1份、羧甲基纤维素钠1.4份、明胶2.5份;
(3)将经过步骤(2)处理后的成品纳豆进行气调包装;气调包装时,所述氮气:氧气:二氧化碳的体积比为72:3.5:17;
(4)将步骤(3)包装后的成品纳豆采用介质阻挡放电DBD等离子体发生装置进行低温等离子体杀菌,电压为55kV,处理时间为85s,然后置于-4℃贮藏。
实施例3:
一种纳豆的保鲜方法,包括下述步骤:
(1)向成品纳豆喷涂生物复配保鲜剂;将生物复配保鲜剂和水按重量比1:100进行混匀,然后喷涂在成品纳豆表面;生物复配保鲜剂的使用量为成品纳豆重量的0.2%;
所述生物复配保鲜剂的制备包括下述重量份的原料:乳酸链球菌素2.8份、纳他霉素1.2份;
(2)向经过步骤(1)处理后的成品纳豆喷涂可食性涂膜复配保鲜剂;将可食性涂膜复配保鲜剂和水按重量比1:80进行混匀,然后喷涂在经过步骤(1)处理后的成品纳豆表面;可食性涂膜复配保鲜剂的使用量为成品纳豆重量的2%;
所述可食性涂膜复配保鲜剂的制备包括下述重量份的原料:改性海藻酸钠4.7份、羧甲基纤维素钠3份、明胶2.7份;
(3)将经过步骤(2)处理后的成品纳豆进行气调包装;气调包装时,所述氮气:氧气:二氧化碳的体积比为75:5:20;
(4)将步骤(3)包装后的成品纳豆采用介质阻挡放电DBD等离子体发生装置进行低温等离子体杀菌,电压为64kV,处理时间为150s,然后置于-4℃贮藏。
对比例1:
在10万级超洁净车间,将成品纳豆包装后,置于-4℃贮藏。
二、实验结果
1、将实施例1-3和对比例1中保存的纳豆保存60天后进行大肠杆菌菌落数量、金黄色葡萄球菌菌落数量的检测。
①检测大肠杆菌菌落数量:
检测方法和标准按照GB4789.3-2016的标准进行,实施例1、实施例2、实施例3和对比例1均取三个样品进行三次检测;大肠杆菌菌落数量的检测结果如下表1所示:
表1大肠杆菌菌落数量表
②检测金黄色葡萄球菌菌落数量:
检测方法和标准按照GB4789.10-2016的标准进行,实施例1、实施例2、实施例3和对比例1均取三个样品进行三次检测;金黄色葡萄球菌菌落数量如下表2所示:
表2金黄色葡萄球菌菌落数量
结论:根据表1和表2,采用本发明所用方法保鲜后的纳豆中大肠杆菌和金黄色葡萄球菌等对纳豆品质有不良影响的革兰氏阴性菌的含量明显较传统方法较少,说明本发明在保鲜上更有优势。
2、将实施例1-3和对比例1中保存的纳豆保存60天后进行感官评价。
感官评价的标准见表3,检测项目包括色泽、香气、口感、拉丝和粘液;实施例1、实施例2、实施例3和对比例1均取三个样品进行三次评价;感官评价结果如下表4所示;
表3纳豆感官评价标准
表4纳豆感官评价结果
结论:根据表4,采用本发明所用方法保鲜后的纳豆感官评价的分值明显高于传统方法的感官评价的分值,说明本发明的保鲜方法优势明显。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到的变化或替换,都应涵盖在本发明的保护范围之内。
Claims (10)
1.一种纳豆的保鲜方法,其特征在于:包括下述步骤:
(1)向成品纳豆喷涂生物复配保鲜剂;所述生物复配保鲜剂的原料包括乳酸链球菌素和纳他霉素;
(2)向经过步骤(1)处理后的成品纳豆喷涂可食性涂膜复配保鲜剂;所述可食性涂膜复配保鲜剂的原料包括改性海藻酸钠、羟甲基纤维素钠和明胶;
(3)将经过步骤(2)处理后的成品纳豆进行气调包装;
(4)将步骤(3)包装后的成品纳豆进行低温等离子体杀菌,然后置于-4~0℃贮藏。
2.根据权利要求1所述的纳豆的保鲜方法,其特征在于:所述步骤(1)中,所述生物复配保鲜剂的制备各原料的重量份分别为:乳酸链球菌素2~3份,纳他霉素1~2份。
3.根据权利要求2所述的纳豆的保鲜方法,其特征在于:所述生物复配保鲜剂的制备各原料的重量份分别为:乳酸链球菌素2.5份,纳他霉素1.7份。
4.根据权利要求1所述的纳豆的保鲜方法,其特征在于:所述步骤(2)中,所述可食性涂膜复配保鲜剂的制备各原料的重量份分别为:改性海藻酸钠4~5份,羟甲基纤维素钠1~3份,明胶2~3份。
5.根据权利要4所述的纳豆的保鲜方法,其特征在于:所述可食性涂膜复配保鲜剂的制备各原料的重量份分别为:改性海藻酸钠4.1份,羟甲基纤维素钠1.4份,明胶2.5份。
6.根据权利要求1所述的纳豆的保鲜方法,其特征在于:所述步骤(3)中,气调包装时,所述氮气:氧气:二氧化碳的体积比为70~75:3~5:15~20。
7.根据权利要求6所述的纳豆的保鲜方法,其特征在于:所述氮气:氧气:二氧化碳的体积比为72:3.5:17。
8.根据权利要求1所述的纳豆的保鲜方法,其特征在于:所述步骤(4)中,所述低温等离子体杀菌采用的是介质阻挡放电DBD等离子体发生装置进行杀菌;电压为 50~70 kV,处理时间为 60~150s。
9.根据权利要求8所述的纳豆的保鲜方法,其特征在于:所述电压为55 kV,处理时间为85s。
10.根据权利要求1-9中任意一项所述的纳豆的保鲜方法,其特征在于:所述步骤(1)、(2)、(3)和(4)均在10万级超洁净车间进行。
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