CN105670047B - 一种改善肠道微生物的金针菇多糖可食用膜 - Google Patents
一种改善肠道微生物的金针菇多糖可食用膜 Download PDFInfo
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Abstract
本发明涉及一种改善肠道微生物的金针菇多糖可食用膜,属于食品包装技术领域。本发明中利用单一的金针菇多糖制备可食用薄膜,其制备原料均提取于金针菇,主要采取溶解、调节pH、均质、真空脱气、干燥成膜、揭膜等工艺,制备过程中不添加其它成膜助剂。本发明的金针菇多糖可食用膜具有良好的机械性能与阻隔性能,透明度高,金针菇多糖在发挥成膜大分子作用的同时,还使产品具有一定辅助改善肠道菌群微生态的功能,可用于糖果包装、农副产品保鲜等领域。
Description
一、技术领域
本发明涉及一种改善肠道微生物的金针菇多糖可食用膜,本发明属于食品包装技术领域,涉及农产品及食品的保鲜与贮藏过程。
二、背景技术
目前,食品包装主要采用塑料包装、纸质包装、胶囊包装等多种包装形式,这些包装不仅容易给食品带来诸多安全隐患,也易造成环境污染。因此,开发一些绿色、安全、可降解的可食用膜成为食品包装领域研究的热点。目前存在的可食用膜主要有蛋白质类可食用膜、多糖类可食用膜、脂质类可食用膜、复合型可食用膜等。这些可食用膜均具有绿色、安全、易于消化吸收等特性,但单一成分制备的可食用薄膜存在机械性能不足、阻隔性能差、无特殊的生理功能等问题,从而会借助在成膜液中添加增塑剂、交联剂、耐水剂、防腐剂、抗菌剂等成膜助剂来改善膜的性能,以达到理想效果。但随着成膜助剂的选用及添加,必然会引入降低薄膜可食性的因素并带来一定程度上的食品安全隐患。
近年来,寻求具有优良成膜性能的天然生物大分子提取物,使得在降低甚至不添加成膜助剂的基础上,通过独立成膜或复配成膜技术即可得到机械性能与阻隔性能优良的可食用薄膜的技术,成为研究热点之一。多糖类可食用薄膜是由高分子多糖聚合物在一定溶剂中通过分子内和分子间的氢键等作用形成的一层具有阻隔作用的网状结构薄膜,其多以淀粉、植物多糖、微生物多糖、食用胶及纤维衍生物等主要原料制成。金针菇(Flammulinavelutipes)属真菌门,担子菌亚门,层菌纲,伞菌目,口磨科,金钱菌属,金针菇多糖含量丰富、来源稳定、绿色安全、且具有免疫调节、抗肿瘤、调节肠道微生物等多种生理活性,是极具开发潜力的生物大分子活性物质。金针菇多糖在溶剂蒸发过程中,分子间相互作用能形成紧密的空间网状结构,特殊的成膜性质可使得无需添加增塑剂、交联剂、耐水剂、防腐剂、抗菌剂等成膜助剂,即可得到成膜性和气体阻隔性好,机械性能强的可食用膜,而且还有调节肠道菌群,促进有益菌生长繁殖的作用。因此,开发金针菇多糖可食用膜无论从加工工艺简单、食品安全性、还是营养功能特性方面都具有重要的意义。
三、发明内容
技术问题
现有的可食用膜普遍存在以下问题:原材料单一;为实现优良的机械性能、阻隔性能以及显著的抑菌效果,需额外添加增塑剂、交联剂、耐水剂、防腐剂、抗菌剂等成膜助剂,用料复杂且安全性难以保障。本发明提供了一种工序合理、工艺简单、可操作性强的金针菇多糖可食用膜的制备方法。由于金针菇多糖自身的分子结构特点使其具有良好的成膜性能,本发明在不添加任何成膜助剂的条件下,利用单一的金针菇多糖成分在一定pH环境形成致密的三维网状结构,经过均质、脱气、一定温湿度条件下干燥成膜,制备的可食用薄膜具备良好的机械性能与气体阻隔性能,同时具有辅助改善肠道菌群微生态,促进益生菌生长的效用,可用于糖果包装、农副产品保鲜等领域。
技术解决方案
本发明解决其技术问题所采用的技术方案步骤为:
(1)金针菇粉在80~90℃热水、固液比1∶40~50条件下浸提4h,提取液用Sevag试剂去除蛋白,再加入3.5~4倍体积无水乙醇沉淀多糖,多糖沉淀用3500Da孔径透析袋透析、冻干得到金针菇多糖粉。
(2)按固液比1∶100~300向金针菇多糖粉中加入去离子水,调节pH在3.5~4.0之间;
(3)将金针菇多糖粉与去离子水混合后,使用均质机均质6~18h,直至形成均一成膜溶液;
(4)将金针菇多糖溶液置于真空装置中抽真空脱气1~4h;
(5)将10~20mL成膜液均匀涂布于直径为8~12cm的成膜容器中,置于恒温恒湿箱中,参数设定为温度30℃~65℃,相对湿度40%~70%,干燥时间为6~18h;
(6)揭膜,所制得的金针菇多糖可食用膜厚度为0.15~0.35mm。
有益效果
与一般可食用薄膜相比,本发明的成膜液原料均提取于新鲜金针菇,依靠金针菇多糖自身生物大分子所具有的优良戍膜特性,在特定成膜条件下形成致密的三维网状结构薄膜,在无需添加其他的成膜助剂的状态下,得到机械强度高,气体阻隔性良好的可食用性薄膜,使可食用膜的成膜工艺变得简单,排除了添加成膜助剂带来的安全隐患,可应用于糖果、糕点、调料粉包等商品的包装。
另一方面,金针菇多糖赋予了可食用膜改善人体肠道微生态的性能,食用后,对肠道中乳酸菌等放线菌门类有益菌有明显的增殖作用,从而对于机体肠道菌群紊乱的微生态情形,能够辅助肠道菌群平衡状态的重新建立,对人体健康有益。
四、附图说明
附图1是金针菇多糖可食用膜样品图;
附图2是菌群结构分析柱状图;
附图3不同固液比成膜液制成的金针菇多糖可食用膜的机械性能图;
附图4不同固液比成膜液制成的金针菇多糖可食用膜的水分透过率(WVP)图。
五、发明的具体实施方式
结合以下具体实例对本发明的原理和特征进行描述,所举实例只用于解释本发明,并非用于限定本发明的范围。
实施例1
按固液比1∶100向金针菇多糖粉中加入去离子水,将成膜粉与去离子水混合后,调节pH为3.8,使用均质机均质10h,直至形成均一成膜溶液。成膜溶液置于真空装置中脱气2h后,将15mL成膜液均匀涂布于直径为12cm的成膜容器中,置于恒温恒湿箱,参数设定为温度52℃,相对湿度60%,干燥12h后取出揭膜。
实施例2
本实施例制备金针菇多糖可食用膜方法与实施例1中的步骤相同,区别在于按固液比1∶150向成膜粉中加入去离子水。
实施例3
本实施例制备金针菇多糖可食用膜方法与实施例1中的步骤相同,区别在于按固液比1∶200向成膜粉中加入去离子水。
实施例4
本实施例制备金针菇多糖可食用膜方法与实施例1中的步骤相同,区别在于按固液比1∶250向成膜粉中加入去离子水。
实施例5
本实施例制备金针菇多糖可食用膜方法与实施例1中的步骤相同,区别在于按固液比1∶300向成膜粉中加入去离子水。
实施例6机械性能测定
将实施例1~5中由不同固液比制成的金针菇多糖可食用膜剪裁成长10cm宽2cm的样品,使用质构仪测定样品的拉伸强度(TS)和断裂延伸率(EAB),结果见附图2。由图可以看出,固液比为1∶150所制得的金针菇多糖可食用膜具有最强的拉仲强度和最低的断裂延伸率,说明该固液比下所成膜的机械性能为五种梯度中最优的,且优于常见可食用膜的机械性能数据,说明本发明的金针菇多糖可食用膜具有良好的机械性能。
实施例7水分透过性测定
将干燥剂(无水CaCl2)放入广口瓶直至距离瓶口1cm处,使用实施例1~5中不同固液比所制得的金针菇多糖可食用膜密封瓶口,然后将广口瓶放在相对湿度为50%,温度为25℃的恒温恒湿箱中,每2h检测一次瓶的增重量,共测定8次。经相应计算公式可得金针菇多糖可食用膜的水分透过率(WVP),结果见附图3。由图可看出固液比为1∶150的金针菇多糖可食用膜水分透过率最低,且低于普遍可食用薄膜的水分透过率,说明本发明的金针菇多糖可食用膜具有良好的水分阻隔性。
实施例8改善肠道微生物试验
按厌氧培养液配方配置肠道菌群厌氧培养液(不含氮源),加入金针菇多糖(每30ml培养液添加0.24g)替代氮源,设置阳性对照,分别加入牛肉膏和鱼粉(每30ml培养液添加0.12g牛肉膏、鱼粉)作为氮源。称取一定量人体粪便样品制成粪便悬液,在厌氧培养箱中接种粪便悬液,在37℃下进行液体厌氧培养(每8h混匀一次),即通过对肠道菌群的培养,分析金针菇多糖对肠道微生物的影响。培养48h后取出,提取培养基中的DNA,进行DNA测序后可进行菌群结构统计和菌群组成数据,见附图3。本试验说明金针菇多糖所培养出的肠道菌群长势良好,且相对阳性对照的培养结果,对肠道微生物的生长有一定的改善作用。其中,金针菇多糖能促进乳杆菌、双歧杆菌等放线菌门微生物生长,抑制大部分变形菌的增殖,变形菌能引起尿道感染,它们也是继发性感染菌,能引起机体其他部位的腐败性损伤,说明金针菇多糖具有一定的抗炎症及抗感染的效果。
Claims (1)
1.一种改善肠道微生物的金针菇多糖可食用膜,其特征在于:包括以下步骤:金针菇干粉在80~90℃热水、固液比1∶40~50条件下浸提4h,提取液用Sevag试剂去除蛋白后,加入3.5~4倍体积无水乙醇沉淀多糖,多糖沉淀用3500Da孔径透析袋透析、冻干得到金针菇多糖粉,即为成膜粉待用;
按固液比1∶100~300向成膜粉中加入去离子水,调节pH至3.5~4.0,将成膜粉与去离子水混合后,使用均质机均质6~18h,直至形成均一多糖溶液,将多糖溶液置于真空装置中脱气1~4h,将10~20mL多糖溶液均匀涂布于直径为8~12cm的平整成膜容器中,置于恒温恒湿箱,参数设定为温度30℃~65℃,相对湿度40%~70%,成膜时间为6~18h,所制得的金针菇多糖可食用膜厚度为0.15~0.35mm。
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