CN117801975A - 具有γ-氨基丁酸和胞外多糖合成能力的嗜热链球菌及其应用 - Google Patents
具有γ-氨基丁酸和胞外多糖合成能力的嗜热链球菌及其应用 Download PDFInfo
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- CN117801975A CN117801975A CN202211206788.2A CN202211206788A CN117801975A CN 117801975 A CN117801975 A CN 117801975A CN 202211206788 A CN202211206788 A CN 202211206788A CN 117801975 A CN117801975 A CN 117801975A
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Abstract
本发明公开了一株具有γ‑氨基丁酸和胞外多糖合成能力的嗜热链球菌及其应用,该嗜热链球菌能够产GABA和/或EPS,其中EPS中含有HA。本发明菌株筛选于藏灵菇中,其发酵液对DPPH和·OH均表现出较强的清除效率,具备很强的抗氧化性,弥补了市场上嗜热链球菌产品的不足,在食品、药品、化妆品领域有潜在的价值和广阔的应用前景。
Description
技术领域
本发明涉及一种嗜热链球菌,具体涉及一种来自藏灵菇的、具有同时合成γ-氨基丁酸和胞外多糖能力的嗜热链球菌及其应用,属于微生物技术领域。
背景技术
嗜热链球菌(Streptococcus thermophilus)是一种重要的乳酸菌,主要从奶制品中分离得到,嗜热链球菌细胞呈球形或卵圆形,成对或链状排列。嗜热链球菌具有兼性厌氧、低GC含量、不产芽孢和过氧化氢酶阴性等特征,因其在牛奶、奶酪等发酵食品中长期安全运用,被美国食品和药品管理局普遍认为是食品安全级(Generally Regarded As Safe,GRAS)微生物。
γ-氨基丁酸(GABA)是一种广泛分布于自然界的非蛋白质氨基酸,由前体物质谷氨酸(L-Glu)或谷氨酸钠(L-MSG)经谷氨酸脱羧酶(GAD)催化产生,是动物神经中枢系统的主要抑制性递质,具有舒缓压力、改善睡眠以及提高人体记忆力等生理功能,是一种兼具药理作用和保健功能的新型功能因子,2009年被国家卫生部配准为新资源食品,具有良好的应用前景。目前,GABA的制备方法主要包括植物富集法、化学合成法及微生物合成法三类,相比较而言,植物富集法产量低、成本高且难度大,化学合成法反应复杂且安全性差,而微生物发酵合成法成本低、安全性较好且条件温和,适用于大规模生产制备,是较为理想的合成方法。乳酸菌胞外多糖(Exopolysaccharide,EPS)是乳酸菌在生长代谢过程中产生并分泌到胞外的次级代谢物的总称,一般为黏液或荚膜多糖等水溶性多糖,是一种天然高分子聚合物。EPS具有多种对人体健康有益的功能,如作为益生元调节肠道菌群、抗氧化、降低胆固醇等。透明质酸(hyaluronic acid,HA)是一种在人体内广泛存在的酸性多糖,具有优秀的保湿性、润滑性、粘弹性及生物相容性,目前已被应用于医药、整形美容、化妆品、日化用品等多个领域。
目前,市场上的益生菌产品主要存在以下不足:
1. 专利菌株主要集中在乳杆菌,目前可应用食品的乳杆菌有14种,而可应用于保健食品的仅有4种,如专利申请CN103937716A、CN111849836A和CN 113493753等。而嗜热链球菌的报道较少,与乳杆菌相比,嗜热链球菌具有更强的安全性,可用于食品和保健品中,有较大的应用前景。
2. 一些抗氧化益生菌产品为多种益生菌的组合,如专利申请CN105853303A和CN103582486A等,虽然多种菌株协同可产生较好的益生作用,但很难就某种有效成分进行专一优化,无法将其优势最大化。
3. 益生菌株主要应用于食品、医药领域,化妆品领域较少。
目前,关于γ-氨基丁酸、乳酸菌胞外多糖、透明质酸这三者都是采用不同的菌种发酵制备,至今未见能够同时发酵制备这三者的相关菌种和方法。如果研究得到一种安全性高的、能够同时生产γ-氨基丁酸、乳酸菌胞外多糖、透明质酸的嗜热链球菌,将可弥补市场上益生菌产品的不足,所得的发酵产品在食品、保健品、医药产品、化妆品等领域也会有较大的应用前景。
发明内容
本发明旨在提供一株来自藏灵菇的嗜热链球菌,该嗜热链球菌与现有其他嗜热链球菌相比能够产γ-氨基丁酸(GABA)和/或乳酸菌胞外多糖(EPS),且乳酸菌胞外多糖中含有较高含量的透明质酸(HA),其发酵产品营养丰富,含有GABA、EPS和HA,具有较强的舒缓神经、抗氧化等功能,可以应用于食品、医药产品、化妆品等多个领域,丰富了抗氧化菌种资源库。
为实现上述发明目的,本发明提供以下技术方案:
一种嗜热链球菌( Streptococcus thermophilus),命名为嗜热链球菌NX1,该嗜热链球菌NX1来源于宁夏藏灵菇。目前,该菌株已于2022年5月19日在中国微生物菌种保藏管理委员会普通微生物中心(简称CGMCC)进行保藏,地址:北京市朝阳区北辰路1号院3号中国科学院微生物研究所,保藏编号为CGMCC NO.24922。
经实验发现,嗜热链球菌NX1发酵所得的发酵液对DPPH和·OH均表现出较强的清除效率,具有强的抗氧化活性。
经实验发现,本发明嗜热链球菌NX1中具有HA代谢途径基因,嗜热链球菌NX1发酵液的EPS中含有透明质酸(HA),且透明质酸在乳酸菌胞外多糖中的含量大于等于12wt%,优选的,大于等于24wt%。基于透明质酸的自身性质,嗜热链球菌NX1发酵液具有优良的保湿性能。
基于本发明嗜热链球菌NX1所表现出的优异性能,本发明还提供了上述嗜热链球菌( Streptococcus thermophilus)NX1在制备发酵产品中的应用。所述发酵产品指的是将嗜热链球菌NX1进行发酵所得的产品。所述发酵产品中含有γ-氨基丁酸和乳酸菌胞外多糖中的一种或两种。
优选的,所述乳酸菌胞外多糖中含有透明质酸。
优选的,发酵产品中同时含有γ-氨基丁酸和乳酸菌胞外多糖,所述乳酸菌胞外多糖中含有透明质酸。
进一步的,所述发酵产品为嗜热链球菌NX1发酵得到的发酵液或者由嗜热链球菌NX1发酵得到的发酵液制备而成。
进一步的,本发明还提供了一种发酵产品,该发酵产品中包含嗜热链球菌(Streptococcus thermophilus)NX1。
进一步的,所述发酵产品中含有γ-氨基丁酸和乳酸菌胞外多糖中的一种或两种,优选的,所述乳酸菌胞外多糖中含有透明质酸。
进一步优选的,发酵产品中同时含有γ-氨基丁酸和乳酸菌胞外多糖,所述乳酸菌胞外多糖中含有透明质酸。
优选的,透明质酸在乳酸菌胞外多糖中的含量大于等于12wt%,更优选的,大于等于24wt%。
进一步的,所述发酵产品为嗜热链球菌NX1发酵得到的发酵液或者由嗜热链球菌NX1发酵得到的发酵液制备而成,即该发酵产品直接为嗜热链球菌发酵得到的发酵液,或者是以嗜热链球菌发酵得到的发酵液为原料,将发酵液进行进一步的处理得到发酵产品。对发酵液进行处理的方式包括但不限于纯化、浓缩、过滤、醇沉、稀释、干燥等步骤。
进一步的,所述发酵产品为液态或固态。
进一步的,本发明中,对嗜热链球菌NX1进行发酵得到发酵液的方式可以参照现有技术中的技术,例如将嗜热链球菌NX1进行种子培养得到足够的种子液,然后将种子液接种到发酵培养基中进行培养。种子培养所用的培养基主要目的是为了菌种的快速生长,可以采用LM17培养基,也可以采用其他的含有碳源、氮源、无机盐等成分、适合于嗜热链球菌NX1生长的培养基,例如由胰蛋白胨、酵母粉、葡萄糖组成的培养基。对于发酵培养基,因为要满足同时合成GABA和EPS的要求,因此发酵培养基中需要添加谷氨酸钠和糖源成分,例如可以选择由乳清粉、氯化镁、磷酸氢二钾、谷氨酸钠、葡萄糖组成的培养基。
进一步的,在本发明某一具体实施方式中,提供了对嗜热链球菌NX1进行发酵得到发酵液的方法,在得到的最终发酵液中,γ-氨基丁酸的产量大于1.5 g/L,乳酸菌胞外多糖的产量大于0.6 g/L,透明质酸的含量大于145 mg/L,透明质酸在乳酸菌胞外多糖的占比为1/4。该发酵液因同时含有γ-氨基丁酸、乳酸菌胞外多糖和透明质酸,具有较好的舒缓神经、保湿性能,同时经验证还具有较强的抗氧化活性,对DPPH和·OH均表现出较强的清除效率。
进一步的,本发明还提供了上述嗜热链球菌NX1发酵产品作为抗氧化成分的应用。
进一步的,本发明上述嗜热链球菌NX1发酵产品在食品、药品、化妆品领域有潜在的价值和广阔的应用前景,因此本发明还提供了该嗜热链球菌NX1发酵产品在制备食品、药品、化妆品中的应用。
本发明还提供了一种具有抗氧化作用的产品,该产品中包括上述嗜热链球菌NX1发酵产品。
进一步的,本发明具有抗氧化作用的产品可以为食品、药品或化妆品。
本发明从藏灵菇中自行筛选得到了一株嗜热链球菌NX1,该菌株能够产GABA和/或EPS,其中EPS中含有HA,HA在EPS中的含量占比大于等于12%。本发明嗜热链球菌NX1发酵得到的发酵产物中含有GABA、EPS和HA,对DPPH和·OH均表现出较强的清除效率,具备很强的抗氧化性,具有很好的保湿、舒缓神经、抗氧化活性,弥补了市场上嗜热链球菌产品的不足,在食品、药品、化妆品领域有潜在的价值和广阔的应用前景。
保藏信息
本发明所述嗜热链球菌( Streptococcus thermophilus)NX1保藏于中国微生物菌种保藏管理委员会普通微生物中心(简称CGMCC),保藏编号为CGMCC NO.24922,保藏日期为2022年5月19日,保藏地址为:北京市朝阳区北辰路1号院3号中国科学院微生物研究所。
附图说明
图1为 葡萄糖标准曲线图。
图2为GABA标准品液相色谱图。
图3为嗜热链球菌NX1发酵液的液相色谱图。
图4为HA标准曲线图。
图5为同浓度的VC、VE、BHT和发酵液对DPPH的清除能力测定结果。
图6 为同浓度的VC、VE、BHT和发酵液对·OH的清除能力测定结果。
图7为嗜热链球菌NX1发酵液、EPS、GABA及EPS+GABA混合液对DPPH清除能力的测定结果。
图8为嗜热链球菌NX1发酵液、EPS、GABA及EPS+GABA混合液对·OH清除能力的测定结果。
具体实施方式
下面结合实施例对本发明做进一步说明,但本发明不受下述实施例的限制,实施例仅起到示例作用。
下述实施例中,如无特别说明,所述浓度均为质量百分浓度。
实施例1嗜热链球菌菌株的筛选
1.1嗜热链球菌菌株的筛选
在超净台将宁夏来源的藏灵菇加入LM17培养基中置于42℃静置培养12h后,得到藏灵菇发酵液。用无菌枪头吸取藏灵菇发酵液至无菌EP管,10倍梯度稀释至105,将101-105涂布LM17平板,42℃倒置培养24h,挑取白色圆形且过氧化氢酶阴性的菌落,镜检为球菌,反复划线确定纯菌落,接种到LM17培养基,取过夜培养的菌液1 mL,10000 rpm离心1 min,弃上清,收集菌体。加入80 μL溶菌酶(20 mg/mL),重悬菌体,37℃水浴20 min。按照TIANGEN细菌基因组提取试剂盒步骤进行基因组提取。测序其16Sr DNA(青岛睿博兴科生物技术有限公司),与NCBI上的序列进行BLAST比对,最终筛选得到10株嗜热链球菌,将菌株分别命名为嗜热链球菌NX1-NX10,目前NX1保藏于中国微生物菌种保藏管理委员会普通微生物中心,编号CGMCC No. 24922。
上述LM17培养基配方为:蛋白胨5 g/L,酵母粉5 g/L,牛肉膏5 g/L,聚蛋白胨5 g/L,抗坏血酸0.5 g/L,β-甘油磷酸二钠19 g/L,七水合硫酸镁0.25 g/L,乳糖10 g/L。如需配置平板,加入2%的琼脂。
已报道嗜热链球菌HA代谢途径基因进行比对
在KEGG Pathway(KEGG PATHWAY Database (genome.jp)查找已报道的嗜热链球菌HA代谢途径,得知嗜热链球菌具备完整的HA代谢通路的关键酶为hasB/Ugd:UDP-葡萄糖脱氢酶;hasC/galU:葡萄糖-1-磷酸尿苷转移酶;hasD/glmU:N-乙酰葡糖胺-1-磷酸尿苷转移酶。通过比对可知,筛选得到的大部分嗜热链球菌缺乏Ugd基因,因此可根据其保守序列设计引物探针ugdF/ugdR,扩增10株嗜热链球菌的基因组,PCR扩增反应体系:0.5 μL的ugdF、0.5 μL的ugdR,0.5 μL 的基因组DNA,12.5 μL Meibo 2×M5 Hiper plus Taq HiFiPCR mix DNA聚合酶,11.2 μL ddH2O。反应程序:95℃ 3min,95℃ 25s,55℃ 25s,72℃15s,32个循环;72℃ 5min;4℃保温。将PCR产物进行琼脂糖凝胶电泳,其中,只有嗜热链球菌NX1和NX2具备Ugd基因,鉴于HA具有优秀的保湿性、润滑性、粘弹性及生物相容性,我们选择具有完整HA代谢通路的嗜热链球菌NX1和NX2进行接下来的发酵和抗氧化性测定。
Ugd酶的氨基酸序列如SEQ ID NO:1所示。
Ugd酶的DNA序列如SEQ ID NO:2所示。
Ugd酶的DNA引物序列如下:
ugdF:tgttgcggataagattatgga
ugdR:actcacgatgtatttgtgagagatt
实施例2嗜热链球菌NX1和 NX2的发酵
将嗜热链球菌NX1和 NX2在LM17平板划线,挑取单菌落至LM17培养基中,37℃静置过夜培养后,以2%接种量分别转接至200 mL种子培养基中,培养至OD=0.2左右(约3.5-4h),将种子培养基全部接种至发酵培养基中,在200 rpm、40℃条件下培养48h,得到嗜热链球菌NX1和 嗜热链球菌NX2的发酵液。整个发酵培养过程中用40%氢氧化钠溶液控制pH为7,发酵过程中不通气。
上述种子培养基配方为:胰蛋白胨(OXOID)10 g/L,酵母粉(OXOID)2.5 g/L,葡萄糖(国药)3 g/L。
上述发酵培养基配方为:乳清粉(WANBANG)15 g/L, 氯化镁(国药)3 g/L,磷酸氢二钾(国药)4 g/L,谷氨酸钠(浙江一诺)20 g/L,葡萄糖(恒德宝)150 g/L。其中,葡萄糖单独灭菌后一次性加入发酵培养基中,整个发酵过程无需补糖。
实施例3嗜热链球菌NX1和NX2发酵液成分的检测
3.1采用苯酚-硫酸法检测发酵液中EPS,具体方法为:
3.1.1绘制葡萄糖标准曲线:
1)、配置葡萄糖标准溶液:精确称取干燥至恒重的葡萄糖100 mg至容量瓶中,加水精确定容至100 mL,摇匀后精确吸取10 mL该溶液,加水定容至100 mL。
2)、配置80%苯酚溶液:准确移取重蒸酚80 mL,蒸馏水定容至100 mL,既得80%苯酚溶液。
3)、配置6%苯酚溶液:将80%苯酚溶液加水稀释至6%,现用现配。
4)、葡萄糖标准曲线制作:分别吸取葡萄糖标准液0.0mL,0.4mL,0.8mL,1.2mL,1.6mL,2 mL于具塞试管中,各补水至2 mL,分别加入6%苯酚溶液1mL,混合均匀后快速悬空加入浓硫酸5 mL,即刻摇匀,室温反应20 min后于490nm测吸光度,以不加葡萄糖的试管做空白对照,结果如图1所示,以纵坐标为吸光度,横坐标为葡萄糖浓度,绘制葡萄糖标准曲线,根据标准曲线得到葡萄糖标准方程,y=0.008x+0.0095。
3.1.2检测发酵液中EPS:
用移液枪准确吸取5 mL实施例2的发酵液,加入15 mL无水乙醇醇沉,13000 rpm离心5 min,倒掉上清,加入10 mL纯化水,26℃、200 rpm溶解,得2×稀释液,将上述2×稀释液用纯化水稀释5倍,得10×稀释液,吸取2 mL10×稀释液,加入6%的苯酚溶液1 mL,混匀后快速加入浓硫酸5 mL(悬空加入),即刻摇匀,室温反应20 min后于490 nm测吸光度,以纯化水作为对照,纵坐标代入葡萄糖标准曲线y=0.008x+0.0095,计算嗜热链球菌NX1和 NX2发酵液中胞外多糖EPS含量。
经检测,嗜热链球菌NX1中EPS含量为0.61 g/L,嗜热链球菌NX2中EPS含量为0.14g/L。
3.2采用衍生法检测发酵液中GABA,具体方法为:
1)、制备衍生缓冲液(0.05 mol/L NaHCO3溶液):称取4.2g NaHCO3,用纯化水定容至100 mL;
2)、制备衍生试剂(1% 2,4-二硝基氟苯—乙腈溶液):吸取1 mL 2,4-二硝基氟苯,用乙腈定容至100 mL;
3)、衍生操作:向50 mL容量瓶中依次加入5 mL衍生缓冲液、5 mL实施例2的发酵液和2.5 mL衍生试剂,将容量瓶放于恒温水浴锅中,60℃ 水浴1h。水浴完成后,用纯水溶液定容至50 mL,即为待检样品溶液。
4)、液相检测
液相条件:A相:4.1g乙酸钠+60 μL冰乙酸,定容至1L;B相:乙腈。
色谱柱:C18 plus。
进样量:10 μL。
柱温:35℃。
流速:0.8 mL/min。
检测波长:360 nm。
时间:30min。
方式:梯度洗脱,梯度洗脱方式见下表1。
将GABA标准品配成浓度0.25 g/L的标准品溶液,将标准品溶液按照上述色谱条件进行检测,得到色谱图,如图2所示,GABA标准品的出峰时间为13.27s。将待测样品溶液按照上述色谱条件进行检测,所得色谱图如图3所示,经计算,嗜热链球菌NX1中GABA的含量为1.6 g/L,嗜热链球菌NX2中GABA的含量为0.77g/L。
发酵液中HA含量的测定
3.3.1采用酶解法检测发酵液中HA,具体方法为:
HA标准曲线制作:精确称取0.2 g HA干粉,精确吸取10 mL纯化水,26℃,200 rpm溶解。摇匀后精确吸取10 mL该HA溶液,加水定容至100 mL。分别吸取HA溶液0.0mL,0.4mL,0.8mL,1.2mL,1.6mL,2 mL于试管中,各补水至2 mL,加入8 mL 5mM的PBS缓冲液,分别取3mL HA溶液和100 uL HA酶,混合均匀;42℃处理1h;酶解完成后煮沸2 min,在232 nm处检测吸光度,如图4所示,以纵坐标为吸光度,横坐标为HA含量,绘制HA标准曲线。
3.3.2发酵液中HA含量的检测,具体方法为:
用移液枪准确吸取5 mL实施例2的发酵液,加入15 mL无水乙醇醇沉,13000 rpm离心5 min,倒掉上清,加入10 mL纯化水,26℃,200 rpm溶解,得2×稀释液,再用移液枪取2mL2×稀释液,加入8mL 5mM的PBS缓冲液,得10×稀释液。
实验组:取3 mL HA10×稀释液和100 uL HA酶,混合均匀;42℃处理1h;酶解完成后煮沸2 min。共设两组平行。
对照组:取3 mL HA10×稀释液100 uL 纯化水,混合均匀;42℃处理1h;酶解完成后煮沸2 min。
吸光度测定:在232 nm处检测,所得吸光度带入标准曲线,计算发酵液中HA含量。代入标准曲线公式y=11.502x-0.0192,经计算,嗜热链球菌NX1 中HA含量平均为147 mg/L,而嗜热链球菌NX2中未检出HA,推测是由于HA产量太低,无法检测到,或者是合成途径中相关基因不表达导致的。
实施例4嗜热链球菌NX1和NX2发酵液抗氧化性能测试
4.1嗜热链球菌NX1和NX2发酵液与常见抗氧化剂抗氧化能力的测定
样品:①以EPS含量为标准,将发酵液稀释至10-200 μg/mL。
②同浓度的抗氧化剂VC、VE和BHT(二丁基羟基甲苯)的水溶液。
DPPH的清除能力的测定:分别以10 µg/mL、20 µg/mL、40 µg/mL、100 µg/mL、200 µg/mLEPS浓度的嗜热链球菌发酵液和相同浓度的VC、VE和BHT比较抗氧化能力,取50 µL各样品溶液与250 µL浓度为25 µM的DPPH-乙醇溶液充分混匀,在室温下避光反应30 min,在517nm下测反应液的吸光度。根据吸光度计算清除率,清除率计算公式如下:
清除率(%)=[1-(A-A1)/A0]×100
A:样品组吸光度值;A1试剂空白吸光度值,即以等体积的无水乙醇代替DPPH溶液。A0:样品空白吸光度值,即以等体积蒸馏水代替样品溶液。
·OH的清除能力的测定:样品及浓度同上。取150 µL各样品溶液与150 µL 9 mM的FeSO4.7H2O溶液、150 µL 9 mM的乙醇-水杨酸溶液充分混匀,再加入150 µL 8.8 mM的H2O2溶液,于37℃反应30 min,在510 nm下测反应液的吸光度。根据吸光度计算清除率,清除率计算公式如下:
清除率(%)=[1-(A-A1)/A0]×100
A:样品组吸光度值;A1:试剂空白吸光度值,即以等体积的蒸馏水代替FeSO4.7H2O溶液;A0:样品空白吸光度值,即以等体积蒸馏水代替样品溶液。
抗氧化能力实验结果
采用上述方式对不同浓度的VC、VE、BHT和发酵液的DPPH和·OH清除能力进行测定,结果如图5和图6所示。从图中可以看出,嗜热链球菌NX1发酵液、嗜热链球菌NX2发酵液、VE、VC和BHT对DPPH和·OH的清除率均显示出剂量依赖性,随着浓度的增加清除能力增加。从DPPH和·OH的清除能力看,嗜热链球菌NX1发酵液对DPPH和·OH的清除能力稍优于VC,嗜热链球菌NX2发酵液对DPPH和·OH的清除能力不如VC,嗜热链球菌NX1发酵液对DPPH和·OH的清除能力明显优于嗜热链球菌NX2发酵液。仅以EPS为定量标准,当嗜热链球菌NX1发酵液稀释到EPS浓度为200 µg/mL时,对DPPH具有80%以上的清除率,对·OH仍具有70%以上的清除率。由此可见,嗜热链球菌NX1发酵液具备较强的抗氧化能力,效果优于嗜热链球菌NX2发酵液,且与常见的强抗氧化剂可媲美。
实施例5嗜热链球菌NX1和NX2发酵液与纯品EPS和GABA抗氧化能力比较
5.1制备EPS粗品:用移液枪准确吸取上述5 mL实施例2的发酵液,沸水浴对发酵液灭活,冷却至室温,13000 rpm离心5 min,去除菌体,上清液加入80%(w/v)三氯乙酸溶液至终浓度为4%(w/v),充分搅拌,在40℃静置24h,,13000 rpm离心30min,去除残留的变性蛋白;向上清液中加入15 mL无水乙醇静置24h醇沉,13000 rpm离心30 min,去除沉淀并用适当的去离子水复溶,在8000-14000 Da的透析袋中透析48h,每6h换一次水,将透析液真空冷冻干燥后得EPS粗品。
5.2配制样品溶液:
①稀释的嗜热链球菌NX1发酵液:将实施例2中的嗜热链球菌NX1发酵液稀释6100倍,得到稀释的嗜热链球菌NX1发酵液,其中EPS含量为 100 ug/mL,GABA 含量为262ug/mL。
②EPS溶液:将醇沉得到的EPS粗品用蒸馏水配制得到浓度为362ug/mL的水溶液。
③GABA溶液:将GABA纯品用蒸馏水配制得到浓度为362 ug/mL的水溶液。
④EPS+GABA混合液:将醇沉所得的EPS粗品和GABA纯品混合,用蒸馏水配制得到EPS终浓度为100 ug/mL、GABA终浓度为262 ug/mL的水溶液。
5.3 DPPH的清除能力的测定:取50 µL各样品溶液,与250 µL浓度为25 µM的DPPH-乙醇溶液充分混匀,在室温下避光反应30 min,在517 nm下测反应液的吸光度。根据吸光度计算清除率,清除率计算公式如下:
清除率(%)=[1-(A-A1)/A0]×100
A:样品组吸光度值;A1试剂空白吸光度值,即以等体积的无水乙醇代替DPPH溶液。A0:样品空白吸光度值,即以等体积蒸馏水代替样品溶液。
5.4 ·OH的清除能力的测定:取150 µL各样品溶液,与150 µL 9 mM的FeSO4.7H2O溶液、150 µL 9 mM的乙醇-水杨酸溶液充分混匀,再加入150 µL 8.8 mM的H2O2溶液,于37℃反应30 min,在510 nm下测反应液的吸光度。根据吸光度计算清除率,清除率计算公式如下:
清除率(%)=[1-(A-A1)/A0]×100
A:样品组吸光度值;A1:试剂空白吸光度值,即以等体积的蒸馏水代替FeSO4.7H2O溶液;A0:样品空白吸光度值,即以等体积蒸馏水代替样品溶液。
5.5实验结果
采用上述方式对各样品的DPPH和·OH清除能力进行测定,结果如图7和图8所示。从图中可以看出,EPS溶液与EPS+GABA混合液相比抗氧化能力相似,这说明EPS和GABA在抗氧化能力方面无明显增效作用。而从本发明稀释的嗜热链球菌NX1发酵液的抗氧化效果看,发酵液的抗氧化效果明显优于EPS溶液、GABA溶液和EPS+GABA混合溶液,在抗氧化能力方面有了极大的提升,表现出了明显的增效作用。
Claims (10)
1.一种嗜热链球菌(Streptococcus thermophilus)NX1,其特征是:其保藏编号为CGMCC No. 24922。
2.权利要求 1所述的嗜热链球菌(Streptococcus thermophilus)NX1在制备发酵产品中的应用。
3.根据权利要求2所述的应用,其特征是:所述发酵产品中含有γ-氨基丁酸和乳酸菌胞外多糖中的一种或两种,优选的,所述乳酸菌胞外多糖中含有透明质酸;进一步优选的,发酵产品中同时含有γ-氨基丁酸和乳酸菌胞外多糖,所述乳酸菌胞外多糖中含有透明质酸。
4.根据权利要求3所述的应用,其特征是:所述发酵产品为嗜热链球菌NX1发酵得到的发酵液或者由嗜热链球菌NX1发酵得到的发酵液制备而成。
5.一种发酵产品,其包含权利要求1所述的嗜热链球菌(Streptococcusthermophilus)NX1。
6.根据权利要求5所述的发酵产品,其特征是:所述发酵产品中含有γ-氨基丁酸和乳酸菌胞外多糖中的一种或两种,优选的,所述乳酸菌胞外多糖中含有透明质酸;进一步优选的,发酵产品中同时含有γ-氨基丁酸和乳酸菌胞外多糖,所述乳酸菌胞外多糖中含有透明质酸。
7.根据权利要求5或6所述的发酵产品,其特征是:其为嗜热链球菌NX1发酵得到的发酵液或由嗜热链球菌NX1发酵得到的发酵液为原料制成;优选的,所述发酵产品为液态或固态。
8.权利要求5-7中任一项所述的发酵产品作为抗氧化成分的应用。
9.权利要求5-7中任一项所述的发酵产品在制备食品、药品、化妆品中的应用。
10.一种具有抗氧化作用的产品,其特征是:包括权利要求5-7中任一项所述的发酵产品;优选的,所述具有抗氧化作用的产品为食品、药品或化妆品。
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