CN114752640A - 一种羊肚菌硒多糖的制备方法 - Google Patents
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Abstract
本发明涉及一种羊肚菌硒多糖的制备方法,以羊肚菌为菌种进行液体深层发酵,通过生物转化将无机硒转化成有机硒多糖,提高硒源利用率,易于人体吸收,且获得的羊肚菌硒多糖DPPH·清除活性比未富硒的羊肚菌胞内多糖提高43.75%,清除活性大大提升,效果非常明显。
Description
技术领域
本发明属于食用菌培养技术领域,涉及富硒羊肚菌液体深层发酵及硒多糖的提取工艺,具体涉及一种羊肚菌硒多糖的制备方法。
背景技术
羊肚菌(Morchella)隶属真菌中子囊菌亚门、盘菌纲、盘菌目、羊肚菌科、羊肚菌属,是一种野生名贵的药食用真菌,具有降血脂、降血糖,调节免疫功能,抗疲劳、抗辐射、抗肿瘤等作用。由于羊肚菌生长条件苛刻,人工培育的难度增大、成本高,所以并未规模化生产。人工栽培的不可控性、栽培土壤的退化现象,培育过程中的病虫害等问题都是制约其快速发展的不利因素,目前尚未解决。
硒是一种物质稀缺、经济稀缺的资源,在地球表面的分布极不平衡,我国约有72%的地区缺硒,特别是从东北到西南的15个省市自治区的部分地区构成了“贫硒地带”。硒是人体必需微量矿质营养元素之一,是人体红细胞谷胱甘肽过氧化物酶和磷脂过氧化氢谷胱甘肽过氧化物酶的重要组成成分,其主要作用是参与酶的合成,保护细胞膜的结构与功能免遭过度氧化和干扰,对维持人体正常的生命活动具有重要的意义。
《WS/T 578.3~2017中国居民膳食营养素参考摄入量第3部分:微量元素》中推荐成年人硒摄入量为60μg/d。我国总膳食结构调查显示,中国居民日常饮食中硒摄入量平均值为26~32μg/d,需要额外补充。无机硒一般指亚硒酸钠和硒酸钠,可从金属矿藏的副产品中获得,其生产工艺简单,成本低廉,安全性差,毒性较大。现已知的集硒手段有两种:人工合成和生物转化。人工合成的产品有硒化亚油酸,硒化脂多糖,肌醇硒酸脂等,生产工艺复杂,价格昂贵,无法满足市场所需;硒的生物转化主要是通过动物、植物、微生物转化无机硒生产有机硒。微生物因具有生长繁殖快、适应和代谢能力强等优点,成为有硒转化的最适载体。羊肚菌等大型真菌可将无机硒通过富集、代谢、转化等作用,使其与多糖结合,形成安全性高、生物可利用性良好的硒多糖,具有易于人体吸收,稳定性良好,对人体无毒副作用等特点,富硒羊肚菌的研究对保障硒资源的可持续开发和发展、进一步揭示功效成分作用机理及其在人类保健事业上的应用有着十分重要的意义。
发明内容
本发明的目的在于克服现有技术的不足,提出一种羊肚菌硒多糖的制备方法。
本发明解决其技术问题是通过以下技术方案实现的:
一种羊肚菌硒多糖的制备方法,其特征在于:所述方法的步骤为:
1)羊肚菌菌种活化
羊肚菌斜面培养基制备:马铃薯200.0g/L、葡萄糖20.0g/L及琼脂20.0g/L,在温度121℃、压强0.1MPa条件下高压灭菌20min,待温度降至45℃~50℃后,摆放入斜面培养基;
羊肚菌母种的活化:将接种铲、酒精灯、打火机及上述配制好的斜面培养基在超净工作台上进行紫外杀菌30min,然后关闭紫外灯,开启风扇,使超净操作台呈正压状态,将接种人员双手用酒精棉球反复擦拭3次,进行消毒,接种时先将接种铲用酒精灯的火焰反复灼烧,待冷却后用接种铲挖取约0.5cm2的羊肚菌母种,倒置在斜面培养基的表面,将斜面培养基的试管口用火焰进行杀菌,塞入棉塞,25℃恒温培养7天;
2)羊肚菌液体种子的制备
羊肚菌液体种子培养基:蔗糖30~50g/L,酵母膏10~30g/L,磷酸二氢钾0.5~1.5g/L,硫酸镁0.5~1.5g/L,在温度121℃、压强0.1MPa条件下高压灭菌20min;
羊肚菌液体种子的制备:将两块面积大小为0.5cm2的羊肚菌斜面菌种接入装液量分别为200、500mL的种子摇瓶中,在温度22~26℃条件下,以150~170r/min摇床振荡培养4~6天;
3)羊肚菌菌丝体富硒发酵
蔗糖30~50g/L,酵母膏10~30g/L,硫酸镁0.5~1.5g/L,磷酸二氢钾0.5~1.5g/L,亚硒酸钠20mg/L,接种量5.0~10.0%,初始pH为6,培养温度22~26℃,摇床转速130~150r/min振荡培养5~6天;
4)羊肚菌菌丝体硒多糖提取
将羊肚菌液体深层发酵产物置于布氏漏斗进行抽滤,用蒸馏水将羊肚菌表面浮色进行反复清洗,待颜色大致退去且布氏漏斗下方没有液体流出时结束抽滤,将收集得到的菌体,置于60℃烘干至恒重,用微型万能粉碎机打成菌粉备用;
将上述菌粉与蒸馏水以1:30的比例,在50~60℃条件下超声浸提60~120min,将浸提液4000~5000r/min离心10~20min,去除沉淀,取上清液;
上清液在40~60℃条件下真空浓缩,并以1:4的比例加入无水乙醇,4℃醇沉8~12h静置,4000~5000r/min冷冻离心10~20min,弃去上清,取沉淀;
向沉淀中加入蒸馏水复溶,直接加入四分之一体积的Sevage溶剂充分振荡后,置于冷冻离心机中4000~5000r/min离心10~20min,弃去蛋白;重复多次直至没有蛋白析出,此时上层液体为羊肚菌胞内粗多糖溶液;取上层清液重复浓缩、醇沉,收集沉淀物,置于40~60℃真空干燥箱中干燥,得到羊肚菌硒多糖。
本发明的优点和有益效果为:
1、本发明羊肚菌硒多糖的制备方法,采用液体深层发酵的方法培养羊肚菌,具有速度快,周期短,易于回收的特点,可以突破气候、环境等因素的限制,避免不利因素对菌种发酵造成的负面影响。
2、本发明羊肚菌硒多糖的制备方法,亚硒酸钠在适宜的浓度范围对羊肚菌发酵具有促进作用,可提升菌丝体得率及菌体胞内多糖含量。
3、本发明羊肚菌硒多糖的制备方法,羊肚菌通过液体深层发酵将无机硒转化成有机硒,以硒蛋氨酸和硒多糖的形式存在,硒蛋氨酸依循蛋氨酸代谢途径代谢,参与蛋白的合成,容易在组织内储存、吸收;硒多糖作为一种非特异性免疫增强剂,兼有多糖和硒两者活性,它可通过多种途径提高机体免疫功能,对机体没有副作用。
4、本发明羊肚菌硒多糖的制备方法,以亚硒酸钠为硒来源,以羊肚菌为菌种进行液体深层发酵,通过生物转化将无机硒转化成有机硒多糖,其DPPH·清除活性比未富硒的羊肚菌胞内多糖提高43.75%,清除活性大大提升,效果非常明显。
附图说明
图1为本发明的羊肚菌硒多糖与Vc及富硒羊肚菌多糖DPPH·清除活性对比图。
具体实施方式
下面通过具体实施例对本发明作进一步详述,以下实施例只是描述性的,不是限定性的,不能以此限定本发明的保护范围。
一种羊肚菌硒多糖的制备方法,其创新之处在于:所述方法的步骤为:
1、羊肚菌液体种子制备
1.1菌种活化
羊肚菌斜面培养基制备:马铃薯200.0g/L,葡萄糖20.0g/L,琼脂20.0g/L,121℃,0.1MPa,高压灭菌20min。待温度降至45℃~50℃,摆放斜面培养基。
羊肚菌母种的活化:将接种铲、酒精灯、打火机以及配制好的斜面培养基在超净工作台中紫外杀菌30min,关闭紫外灯,开启风扇,使操作台呈正压状态,双手用酒精棉球反复擦拭3次,进行消毒。接种时先将接种铲用酒精灯的火焰反复灼烧,待冷却后用接种铲挖取约0.5cm2的羊肚菌母种,倒置在斜面培养基的表面,将斜面培养基的试管口用火焰进行杀菌,塞入棉塞,25℃恒温培养7天。
1.2羊肚菌液体种子的制备
羊肚菌液体种子培养基:蔗糖30~50g/L,酵母膏10~30g/L,磷酸二氢钾0.5~1.5g/L,硫酸镁0.5~1.5g/L,121℃,0.1MPa,高压灭菌20min。
羊肚菌液体种子的制备:将两块面积大小为0.5cm2的羊肚菌斜面菌种接入装液量为200/500mL的种子摇瓶中,22~26℃,150~170r/min摇床振荡培养4~6天。
2、羊肚菌菌丝体富硒发酵
蔗糖30~50g/L,酵母膏10~30g/L,硫酸镁0.5~1.5g/L,磷酸二氢钾0.5~1.5g/L,亚硒酸钠20mg/L,接种量5.0~10.0%,初始pH6,培养温度22~26℃,摇床转速130~150r/min振荡培养5~6天。
3、羊肚菌菌丝体硒多糖提取
将羊肚菌液体深层发酵产物置于布氏漏斗进行抽滤,用蒸馏水将羊肚菌表面浮色进行反复清洗,待颜色大致退去且布氏漏斗下方没有液体流出时结束抽滤,收集得到的菌体,置于60℃烘干至恒重,用微型万能粉碎机打粉备用。
将菌粉与蒸馏水以1:30的比例,50~60℃超声浸提60~120min。将浸提液4000~5000r/min离心10~20min,去除沉淀,取上清液。上清液40~60℃真空浓缩,以1:4的比例加入无水乙醇,4℃醇沉8~12h静置,4000~5000r/min冷冻离心10~20min,弃去上清,取沉淀。
向沉淀中加入蒸馏水复溶,直接加入四分之一体积的Sevage溶剂(正丁醇:氯仿=1:4),充分振荡后,置于冷冻离心机中4000~5000r/min离心10~20min,弃去蛋白。重复多次直至没有蛋白析出,此时上层液体为羊肚菌胞内粗多糖溶液。取上层清液重复浓缩、醇沉步骤,收集沉淀物,置于40~60℃真空干燥箱中干燥,得到羊肚菌硒多糖。
羊肚菌硒多糖抗氧化性测定
1、DPPH自由基清除率测定方法
吸取不同浓度样品2.0mL,加入0.2mmol/L的DPPH~乙醇溶液2mL,充分混匀后避光保存30min,然后在517nm处测定吸光度值,记为A1。用同样体积的乙醇和蒸馏水分别取代DPPH溶液和样品做调零,以同样体积的无水乙醇代替多糖样品测得吸光度值为A0,以同样体积的无水乙醇代替DPPH~乙醇溶液测得的吸光度值为A2,抗坏血酸做阳性对照,由此可得DPPH自由基清除率的计算公式为:
DPPH自由基清除率(%)=[1~(A1~A2)/A0]*100%
2、DPPH自由基清除能力验证
DPPH是一种比较稳定的氮中心的脂性自由基,其N上有一个游离电子,由于三个苯环的共振稳定作用,使夹在中间的氮原子上不成对的电子不能发挥其应有的电子成对作用。DPPH的乙醇溶液呈紫色,在517处有最大的吸收峰。向其加入自由基清除剂以后,DPPH捕捉一个电子与游离电子配对,紫色褪去,变为无色物质,在517nm处的吸收消失,其褪色程度与其接受的电子数成定量关系。依此原理用分光光度计检测DPPH自由基与试样液反应后吸光值的变化,可检定试样提供氢原子、清除自由基抗氧化的能力。
如图1所示:
Vc对DPPH·的清除率的线性回归方程为:y=74.693x+26.045(R2=0.9984),IC50为0.32mg/mL;
羊肚菌硒多糖的线性回归方程为:y=50.343x+26.07(R2=0.9981),IC50为0.48mg/mL;
未富硒羊肚菌多糖的线性回归方程为:y=39.164x+22.945(R2=0.9975),IC50为0.69mg/mL。
对DPPH·清除作用大小为:Vc>羊肚菌硒多糖>未富硒羊肚菌多糖。羊肚菌硒多糖清除DPPH·能力比未富硒羊肚菌多糖提高43.75%。
尽管为说明目的公开了本发明的实施例和附图,但是本领域的技术人员可以理解:在不脱离本发明及所附权利要求的精神和范围内,各种替换、变化和修改都是可能的,因此,本发明的范围不局限于实施例和附图所公开的内容。
Claims (1)
1.一种羊肚菌硒多糖的制备方法,其特征在于:所述方法的步骤为:
1)羊肚菌菌种活化
羊肚菌斜面培养基制备:马铃薯200.0g/L、葡萄糖20.0g/L及琼脂20.0g/L,在温度121℃、压强0.1MPa条件下高压灭菌20min,待温度降至45℃~50℃后,摆放入斜面培养基;
羊肚菌母种的活化:将接种铲、酒精灯、打火机及上述配制好的斜面培养基在超净工作台上进行紫外杀菌30min,然后关闭紫外灯,开启风扇,使超净操作台呈正压状态,将接种人员双手用酒精棉球反复擦拭3次,进行消毒,接种时先将接种铲用酒精灯的火焰反复灼烧,待冷却后用接种铲挖取约0.5cm2的羊肚菌母种,倒置在斜面培养基的表面,将斜面培养基的试管口用火焰进行杀菌,塞入棉塞,25℃恒温培养7天;
2)羊肚菌液体种子的制备
羊肚菌液体种子培养基:蔗糖30~50g/L,酵母膏10~30g/L,磷酸二氢钾0.5~1.5g/L,硫酸镁0.5~1.5g/L,在温度121℃、压强0.1MPa条件下高压灭菌20min;
羊肚菌液体种子的制备:将两块面积大小为0.5cm2的羊肚菌斜面菌种接入装液量分别为200、500mL的种子摇瓶中,在温度22~26℃条件下,以150~170r/min摇床振荡培养4~6天;
3)羊肚菌菌丝体富硒发酵
蔗糖30~50g/L,酵母膏10~30g/L,硫酸镁0.5~1.5g/L,磷酸二氢钾0.5~1.5g/L,亚硒酸钠20mg/L,接种量5.0~10.0%,初始pH为6,培养温度22~26℃,摇床转速130~150r/min振荡培养5~6天;
4)羊肚菌菌丝体硒多糖提取
将羊肚菌液体深层发酵产物置于布氏漏斗进行抽滤,用蒸馏水将羊肚菌表面浮色进行反复清洗,待颜色大致退去且布氏漏斗下方没有液体流出时结束抽滤,将收集得到的菌体,置于60℃烘干至恒重,用微型万能粉碎机打成菌粉备用;
将上述菌粉与蒸馏水以1:30的比例,在50~60℃条件下超声浸提60~120min,将浸提液4000~5000r/min离心10~20min,去除沉淀,取上清液;
上清液在40~60℃条件下真空浓缩,并以1:4的比例加入无水乙醇,4℃醇沉8~12h静置,4000~5000r/min冷冻离心10~20min,弃去上清,取沉淀;
向沉淀中加入蒸馏水复溶,直接加入四分之一体积的Sevage溶剂充分振荡后,置于冷冻离心机中4000~5000r/min离心10~20min,弃去蛋白;重复多次直至没有蛋白析出,此时上层液体为羊肚菌胞内粗多糖溶液;取上层清液重复浓缩、醇沉,收集沉淀物,置于40~60℃真空干燥箱中干燥,得到羊肚菌硒多糖。
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CN103130909A (zh) * | 2013-03-17 | 2013-06-05 | 吉林大学 | 一种富硒羊肚菌多糖的制备方法 |
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