CN113604378A - 一种制备罗汉果甜苷代谢产物的复合菌剂及其应用 - Google Patents
一种制备罗汉果甜苷代谢产物的复合菌剂及其应用 Download PDFInfo
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Abstract
本发明公开了一种制备罗汉果甜苷代谢产物的复合菌剂及其应用,所述复合菌剂包含:普雷沃菌、纺锤链杆、巨单胞菌、拟杆菌、大肠埃氏菌‑志贺氏菌、长栖粪杆菌、林斯氏菌、布劳特氏菌、巨球型菌、考拉杆菌、阿利斯佩斯菌、双歧杆菌、狄氏副拟杆菌、粪厌氧棒杆菌、粪球菌、链球菌、颤螺旋菌、瘤胃球菌、多尔氏菌、丁蓖麻球菌、梭状芽胞杆菌XlVa。所述复合菌剂可以高效制备罗汉果甜苷代谢产物,将罗汉果甜苷完全转化,并且复合菌剂来源于健康人群肠道,安全高效,而且来源广泛且成本低廉。并且与罗汉果甜苷相比,罗汉果甜苷代谢产物具有更强的抗氧化活性,具有一定的药用价值。
Description
技术领域
本发明属于食品微生物组学技术领域,具体涉及一种制备罗汉果甜苷代谢产物的复合菌剂及其应用。
背景技术
罗汉果甜苷即罗汉果苷V,是一种提取自罗汉果干燥果实的葫芦烷型三萜苷类物质,因其具有甜度高、热量低、生理特性安全良好、稳定性高等优点被作为一种天然的甜味剂和食品添加剂广泛使用。最近的研究表明,罗汉果甜苷在降血糖血脂、清除自由基、抗肿瘤等方面具有潜在的应用价值,因而作为一种健康的功能性食品受到了广泛的关注。
罗汉果甜苷主要是通过其苷元罗汉果醇以β型糖苷键与吡喃葡萄糖苷相连构成,多糖苷的结构在一定程度上限制了其在体内的生物利用度与生物学活性,由于人体缺乏β型糖苷酶,而在肠道微生物中β型糖苷酶具有广泛的分布,因此罗汉果甜苷在进入人体后能够保持其结构的稳定性,直至被肠道微生物进行代谢和消化。目前,经微生物代谢的三萜类化合物被认为具有更强的生物学活性与生物利用度,而次级罗汉果苷及罗汉果醇的获得主要是通过对植物原料中特定成分的提取、富集、分离来进行的。但次级罗汉果苷及罗汉果醇在罗汉果中含量较低,且传统的制备方法分离难度大,成本较高。由人肠道来源的微生物群代谢对高抗氧化活性的罗汉果甜苷代谢产物进行富集具有操作简单,高效等优势。
目前公开的两种罗汉果甜苷衍生物(次级罗汉果苷及罗汉果醇)的制备方法,CN111217880A采用化学法对罗汉果粉碎物进行水提取,通过树脂吸附及乙醇洗脱后浓缩干燥获得罗汉果糖苷复合物,但未对复合物的具体成分进行阐述;CN111187328B主要通过化学法对罗汉果提取物进行高温高压酸水解后进行柱层析及精制后获得罗汉果醇及11-O-罗汉果醇,两种方法均存在成本较高,且原液成分复杂增加分离纯化难度。
发明内容
本发明的目的在于提供一种可以高效制备罗汉果甜苷代谢产物的复合菌剂及其应用。
本发明所采取的技术方案是:
本发明的第一方面,提供一种微生物混合物,包含:普雷沃菌(Prevotella)、纺锤链杆(Fusicatenibacter)、巨单胞菌(Megamonas)、拟杆菌(Bacteroides)、大肠埃氏菌-志贺氏菌(Escherichia/Shigella)、长栖粪杆菌(Faecalibacterium)、林斯氏菌(Collinsella)、布劳特氏菌(Blautia)、巨球型菌(Megasphaera)、考拉杆菌(Phascolarctobacterium)、阿利斯佩斯菌(Alistipes)、双歧杆菌(Bifidobacterium)、狄氏副拟杆菌(Parabacteroides)、粪厌氧棒杆菌(Anaerostipes)、粪球菌(Coprococcus)、链球菌(Streptococcus)、颤螺旋菌(Oscillibacter)、瘤胃球菌(Ruminococcus)、多尔氏菌(Dorea)、丁蓖麻球菌(Butyricicoccus)、梭状芽胞杆菌XlVa(Clostridium_XlVa)。
在本发明的一些实施方式中,所述普雷沃菌、纺锤链杆、巨单胞菌、拟杆菌、大肠埃氏菌-志贺氏菌、长栖粪杆菌、林斯氏菌、布劳特氏菌、巨球型菌、考拉杆菌、阿利斯佩斯菌、双歧杆菌、狄氏副拟杆菌、粪厌氧棒杆菌、粪球菌、链球菌、颤螺旋菌、瘤胃球菌、多尔氏、丁蓖麻球菌属、梭状芽胞杆菌XlVa的配比为:(95~100):(40~45):(20~24):(15~18):(12~14):(12~14):(10~13):(5~9):(5~9):(5~9):(3~5):(3~5):(3~5):(2~4):(1~3):(1~3):(1~3):(1~3):(1~2):(1~2):1。
在本发明的一些实施方式中,所述普雷沃菌、纺锤链杆、巨单胞菌、拟杆菌、大肠埃氏菌-志贺氏菌、长栖粪杆菌、林斯氏菌、布劳特氏菌、巨球型菌、考拉杆菌、阿利斯佩斯菌、双歧杆菌、狄氏副拟杆菌、粪厌氧棒杆菌、粪球菌、链球菌、颤螺旋菌、瘤胃球菌、多尔氏菌、丁蓖麻球菌、梭状芽胞杆菌XlVa的配比为99.11:42.11:21.57:16.17:12.63:12.83:11.49:6.91:6.09:6.14:3.97:3.66:3.8:2.51:1.94:1.69:1.80:1.54:1.03:1.06:1。
本发明的第二方面,提供本发明第一方面所述复合菌剂在制备罗汉果甜苷代谢产物中的应用。
在本发明的一些实施方式中,所述罗汉果甜苷代谢产物为罗汉果苷III、罗汉果苷II、罗汉果苷I、罗汉果醇中的至少一种。
在本发明的一些实施方式中,所述罗汉果甜苷代谢产物包含:0.2%~1%罗汉果苷III、1%~3%罗汉果苷II、5%~10%罗汉果苷I、80%~90%罗汉果醇。在本发明的一些更优选实施方式中,所述罗汉果甜苷代谢产物为罗汉果醇。
本发明的第三方面,提供一种制备罗汉果甜苷代谢产物的方法,使用本发明第一方面所述复合菌剂进行厌氧发酵。
在本发明的一些实施方式中,所述厌氧发酵的条件为:150~250rpm、35~39℃下反应20~28h。
在本发明的一些实施方式中,所述厌氧发酵的条件为:200rpm、37℃下反应24h。
在本发明的一些实施方式中,所述厌氧发酵为N2环境,气体配比:100%N2。
在本发明的一些实施方式中,厌氧发酵的培养基的配方为:2.0g/L酵母提取物,2.0g/L蛋白胨,0.1g/L氯化钠,0.04g/L磷酸二氢钾,0.04g/L磷酸氢二钾,0.01g/L七水合硫酸镁,0.01g/L氯化钙,2.0g/L碳酸氢钠,0.02g/L氯化血红素,0.5g/L盐酸半胱氨酸,0.5g/L胆盐,2.0mL/L吐温80,1.0mL/L 1%刃天青,10μL/L维生素K1。
在本发明的一些实施方式中,所述罗汉果甜苷的纯度为≥90%,浓度为5~15mg/mL。
在本发明的一些优选实施方式中,所述罗汉果甜苷的浓度为10mg/mL。
在本发明的一些实施方式中,所述厌氧发酵后通过离心-洗涤-醇溶-浓缩分离出罗汉果代谢产物。
本发明的第四方面,提供一种罗汉果甜苷代谢产物,由本发明第三方面所述方法制备而成。
在本发明的一些实施方式中,所述罗汉果甜苷代谢产物包含罗汉果苷III、罗汉果苷II、罗汉果苷I、罗汉果醇中的至少一种。
在本发明的一些实施方式中,所述代谢产物包含:0.2%~1%罗汉果苷III、1%~3%罗汉果苷II、5%~10%罗汉果苷I、80%~90%罗汉果醇。
在本发明的一些优选实施方式中,所述罗汉果甜苷代谢产物为罗汉果醇。
本发明的第五方面,提供本发明第四方面所述罗汉果甜苷代谢产物在制备抗氧化产品中的应用。
发明人研究了罗汉果甜苷代谢产物的抗氧化活性各项指标均有显著提高,能够更好的用于制备抗氧化产品。
本发明的有益效果是:
本发明提供一种复合菌剂,包含普雷沃菌、纺锤链杆、巨单胞菌、拟杆菌、大肠埃氏菌-志贺氏菌、长栖粪杆菌、林斯氏菌、布劳特氏菌、巨球型菌、考拉杆菌、阿利斯佩斯菌、双歧杆菌、狄氏副拟杆菌、粪厌氧棒杆菌、粪球菌、链球菌、颤螺旋菌、瘤胃球菌、多尔氏菌属、丁蓖麻球菌、梭状芽胞杆菌XlVa。复合菌剂可以高效制备罗汉果甜苷代谢产物,将罗汉果甜苷完全转化,并且复合菌剂来源于健康人群肠道,安全高效,而且来源广泛且成本低廉。
与其他化学法制备高抗氧化活性的罗汉果糖苷及罗汉果醇等代谢产物的方法相比,本发明采用微生物组发酵法以罗汉果甜苷为底物,利用人源的肠道菌剂发酵获得次级罗汉果甜苷代谢产物,更加安全高效,而且与其它罗汉果甜苷代谢产物制备方法相比次级罗汉果苷水溶性低,能够自动从发酵液体系中析出,从而分离反应液体系与产物,进一步缩短工艺流程,降低分离成本。经鉴定产物中成分组成相对简单易于分离,且与罗汉果甜苷相比具有更强的抗氧化活性,抗氧化活性各项指标均有显著提高,DPPH、ABTS、超氧自由基、羟自由基清除率分别提高约130%、35%、150%、210%;亚铁离子螯合率提高约60%,还原力提高约140%。具有一定的药用价值。
附图说明
图1为不同发酵时间点罗汉果甜苷消耗情况液相色谱图。
图2为罗汉果甜苷(MV)与其代谢产物(MVM)的抗氧化活性比较。A图为DPPH自由基的清除活性测定;B图为ABTS自由基清除活性的测定;C图为超氧阴离子自由基清除活性的测定;D图为羟自由基清除能力;E图为Fe2+螯合能力的测定;F图为样品还原力的测定。
图3为筛选菌株在七叶苷平板上酶活表征情况。
图4为8株高β葡萄糖苷酶活菌株单菌发酵罗汉果苷V 48h上清液相图谱。
具体实施方式
以下将结合实施例对本发明的构思及产生的技术效果进行清楚、完整地描述,以充分地理解本发明的目的、特征和效果。显然,所描述的实施例只是本发明的一部分实施例,而不是全部实施例,基于本发明的实施例,本领域的技术人员在不付出创造性劳动的前提下所获得的其他实施例,均属于本发明保护的范围。
厌氧发酵培养基:2.0g/L酵母提取物,2.0g/L蛋白胨,0.1g/L氯化钠,0.04g/L磷酸二氢钾,0.04g/L磷酸氢二钾,0.01g/L七水合硫酸镁,0.01g/L氯化钙,2.0g/L碳酸氢钠,0.02g/L氯化血红素,0.5g/L盐酸半胱氨酸,0.5g/L胆盐,2.0mL/L吐温80,1.0mL/L 1%刃天青,10μL/L维生素K1。
富集培养基(basal nutrient growth medium supplemented with momordicagrosvenori,BNMM):液体培养基成分(100mL):0.2g酵母提取物,0.2g蛋白胨,0.01g NaCl,0.004g KH2PO4,0.004g K2HPO4,0.001g MgSO4·7H2O,0.001g CaCl2,0.2g NaHCO3,0.002g氯化血红素,0.05g半胱氨酸-盐酸,0.05g胆盐,0.2mL吐温80,5μL 1%刃天青溶液和1μL维生素K1,添加1.0g的罗汉果提取物干粉(终浓度为10.0mg/mL)作为主要碳源。
筛选培养基:CMC固体培养基:K2HPO4·3H2O 1.96g/L,KH2PO4 0.75g/L,MgCl2·6H2O 0.4g/L,NH4Cl 0.9g/L,NaCl 0.9g/L,FeSO4·7H2O 5.5mg/L(1%FeSO4 0.3mL),羧甲基纤维素钠(简称CMC-Na,是β-葡萄糖苷酶的底物)1%,用盐酸调节pH值为6.0,1.6%琼脂,高压灭菌(115℃,20min),倒平板备用。
CMC培养基的配制方法:将CMC-Na和琼脂先分装到锥形瓶,再将已调好pH的其他物质溶解液分装,高压灭菌时CMC-Na和琼脂会直接溶解。灭菌后的培养基在60℃的温度下倒平板,以确保表面光滑。涂布之前,将平板在37℃的厌氧室中放置过夜,以干燥培养基表面。
七叶苷固体培养基:蛋白胨10g/L,酵母粉3g/L,NaCl 5g/L,七叶苷1g/L,柠檬酸铁铵0.5g/L,琼脂粉15g/L,高压灭菌(115℃,20min),倒平板备用。
实施例1人源肠道菌微生物组菌液的制备
本研究中用于发酵的肠道菌群由4名供体(2男2女)提供,由当地伦理委员会批准同意了这项过程。这些志愿者在实验前三个月内都没有服用抗生素,无任何肠胃疾病;微生物组样品采集后按20%的比例(w/v)用灭菌的厌氧培养基进行重悬预孵育,获得含有稳定肠道微生物的菌群悬浊液作为罗汉果甜苷体外孵育的菌液。
实施例2肠道菌群组成的鉴定
菌液以最高转速离心1min后收集沉淀,采用PowerSoil DNA提取试剂盒(MoBio,Carlsbad,USA)对总DNA进行提取,分别用正向引物(5'-CCTACGGGNGGCWGCAC-3'SEQ IDNO.1)和反向引物(5'-GACTACHVGGGTATCTAATCC-3'SEQ ID NO.2)扩增16S rRNA基因的V3-V4高变区进行文库构建及高通量测序,测序结果与RDP数据库进行比对,代表序列按照97%相似度进行聚类,实验用肠道菌群组分主要见表1。
表1肠道菌群组分分析
实施例3肠道菌群对罗汉果甜苷的体外转化
肠道菌群孵育培养基采用厌氧培养基,向厌氧培养基中分别添加罗汉果甜苷干粉,添加量为10mg/mL。随后,1mL过滤后的菌群悬浊液被接种到含有罗汉果甜苷的25mL厌氧培养基中进行发酵,在N2环境,200rpm转速下进行37℃下厌氧孵育反应24h。
高效液相色谱结果见图1,表明发酵上清液中罗汉果甜苷在经过肠道菌群24h代谢后被完全转化。
实施例4质谱检测
1)浓缩、重悬
取24h罗汉果甜苷肠菌发酵液进行12000rpm离心5min分离沉淀与上清液,弃去上清,沉淀用无菌水重复洗涤3次后,用等体积甲醇溶解沉淀,涡旋混匀,12000rpm离心2min分离沉淀与上清,再次用等体积甲醇溶解沉淀并离心分离,直至离心后沉淀含量不变,合并多次甲醇提取液进行进一步浓缩。
取罗汉果苷复合物的甲醇溶液于新的15mL离心管(离心管预先称重),采用氮吹仪对溶液进行浓缩干燥,吹干后称量离心管质量,减去空管质量得罗汉果苷复合物质量,按照10mg/mL浓度加入适量甲醇进行复溶,溶液经过0.22μm滤膜过滤后用于抗氧化活性检测与质谱检测。
2)高分辨质谱鉴定罗汉果苷复合物组成
对获得的罗汉果苷复合物进行质谱分析采用高分辨液质联用仪(UHPLC-MS)进行组分鉴定。液相分离采用Hypersil GOLD C18柱(100mm×2.1mm.,1.9μm;Thermo FisherScientific),流动相甲酸(0.1%,v/v,A相)与甲醇(B相)梯度洗脱比例为:0~1min,2%B相维持1min;1~9min B相比例从2%升至98%;9~12min,B相维持3分钟。
进样量为5μL,流速为0.35mL/min,柱箱保持35℃。离子源参数为,喷淋电压:3kV;毛细管温度:320℃;保护气流量:40L/h;辅助气流量:10L/h;扫描范围:m/z 133.4~2000;负离子模式下进行。分子量结果与已报道罗汉果苷数据集进行比对。结果见表2。
表2罗汉果甜苷孵育前后成分质谱响应值鉴定结果
结果表明,罗汉果甜苷经过肠道微生物代谢后转化为难溶于水的代谢产物从发酵液中析出,经过高分辨质谱鉴定,罗汉果甜苷代谢产物中罗汉果醇为主要代谢产物及代谢终产物。
实施例5罗汉果苷复合物抗氧化活性评价
1对DPPH自由基的清除活性测定
反应在96孔微孔板上进行,每孔加入100μL样品溶液、25μL无水乙醇溶解的DPPH溶液(0.4mM)并混匀。在30℃黑暗中反应30min,用酶标仪在515nm处测定吸光值。
其中Abs0是对照(甲醇)的吸光值,Abs1是样品的吸光值,Abs2是样品在与Abs1相同条件下用无水乙醇代替DPPH溶液的吸光值。结果见图2中A图。
2ABTS自由基清除活性的测定
将ABTS原液(7.0mM)用等体积过硫酸钾(K2S2O8,4.95mM)室温黑暗过夜氧化,生成ABTS自由基溶液。ABTS自由基溶液用PBS(0.2M,pH7.4)稀释,使其在734nm波长处的吸光值为0.70±0.02,得到ABTS+反应液。将20μL样品和200μL反应液混合在96孔板中,室温下反应6min,在734nm波长处测定吸光值。计算公式参照DPPH自由基清除率计算。
其中Abs0是对照的吸光值,Abs1是样品的吸光值,Abs2是样品在与Abs1相同条件下用PBS代替ABTS反应液的吸光值。结果见图2中B图。
3超氧阴离子自由基清除活性的测定
NADH、NBT和PMS用PBS(0.1M,pH7.4)溶液溶解。将50μL的样品、50μL的NADH(468μM)、50μL的NBT(156μM)和50μL的PMS(60μM)混合在96孔板中,25℃孵育5min,560nm处测定吸光值。计算公式参照DPPH自由基清除率计算。
其中Abs0是对照的吸光值,Abs1是样品的吸光值,Abs2是样品在与Abs1相同条件下用0.1M PBS代替NBT溶液的吸光值。结果见图2中C图。
4羟自由基清除活性的测定
将50μL样品、50μL FeSO4·7H2O(6.0mM)和50μL H2O2(2.4mM)混合,室温反应10min,加入50μL水杨酸(6.0mM),30℃下孵育30min,测量510nm的吸光值。计算公式参照DPPH自由基清除率计算。
其中Abs0是对照的吸光值,Abs1是样品的吸光值,Abs2是样品在与Abs1相同条件下用无菌水代替H2O2的吸光值。结果见图2中D图。
5Fe2+金属螯合能力测定
将50μL的样品、2.5μL的FeCl2(3.0mM)、10μL的Ferrozine(5.0mM,菲洛嗪)溶液和137μL的无菌水混合,在25℃下孵育10min,然后在562nm处测定吸光值。计算公式参照DPPH自由基清除率计算。
其中Abs0是对照的吸光值,Abs1是样品的吸光值,Abs2是样品在与Abs1相同条件下用无菌水代替FeCl2溶液的吸光值。结果见图2中E图。
6样品还原力的测定
样品的还原反应在96孔微孔板上进行,每孔含有50μL样品溶液、50μL PBS缓冲液(0.2M,pH6.6)和50μL K3Fe(CN)6溶液(铁氰化钾,1%,w/v)的混合物,在50℃孵育20min。加入50μL三氯乙酸(10%,w/v,终止反应)和30μL FeCl3(0.1%,w/v)后,在700nm处测定吸光值。
还原力=Abs1-Abs2。
其中Abs1是样品的吸光值,Abs2是样品在与Abs1相同条件下用无菌水代替FeCl3溶液的吸光值。结果见图2中F图。
结果表明罗汉果甜苷复合物抗氧化活性各项指标均有显著提高,DPPH、ABTS、超氧自由基、羟自由基清除率分别提高约130%、35%、150%、210%;亚铁离子螯合率提高约60%,还原力提高约140%。
对比例1糖苷水解酶活性菌株筛选及单菌发酵
1)将实施例3中获得的菌群发酵液采用0.02M PBS(pH=7.2)缓冲液梯度稀释至10-8,吸取10-1~10-8稀释液各200μL分别涂布于以CMC为唯一碳源的固体平板初筛培养基上,37℃下厌氧培养3d,待能利用CMC的菌落长出后,在菌落密度合适且分离良好的稀释度平板上挑取形态大小不一的单菌落划线分离。将划线纯化3次后得到的单菌落接种于10mLGAM液体培养基中,37℃厌氧培养48h后,将菌液保存在15%甘油中,置于-80℃保存,作为供试菌种进行后续实验。同时,将划线纯化后的单菌落点到七叶苷固体培养基平板上,37℃下培养48h,定性检测纯化菌株是否产β-葡萄糖苷酶,图3为筛选菌株在七叶苷平板上酶活表征情况。
2)单菌发酵罗汉果甜苷(MV)
根据酶活大小的定性表征(黑色圈大小)将筛选出的1、3、4、5、8、9、10、12号产β葡萄糖苷酶能力的保种菌株在GAM平板上划线活化,将活化长出的单菌落接种于10mL GAM培养基中,厌氧培养24h后作为种子液。同时,将活化长出的单菌落分别点板于在好氧和厌氧条件下培养的七叶苷平板,观察对比菌株在好氧和厌氧条件下的产酶能力,综合不同条件平板上产生黑色圈的结果,挑选产酶变色圈更早出现且颜色较深的菌株进行罗汉果甜苷(MV)的发酵培养,种子液分别调节OD值为1.0接种于10mL液体发酵培养基中,每株菌作3个平行样,并以不接菌的发酵培养基作对照,在37℃、200r/min的好氧条件下发酵培养。48h发酵液取上清待用于高效液相测定,探究单一菌株是否发酵降解了罗汉果甜苷(MV),结果见图4。
可以看出,发酵48h后,发酵液上清中罗汉果甜苷(MV)峰面积几乎没有下降,表明以上单一菌株无法代谢罗汉果甜苷(MV),肠道菌群对罗汉果甜苷(MV)的代谢可能存在不同菌株之间潜在的协同作用。
上述具体实施方式对本发明作了详细说明,但是本发明不限于上述实施例,在所属技术领域普通技术人员所具备的知识范围内,还可以在不脱离本发明宗旨的前提下作出各种变化。此外,在不冲突的情况下,本发明的实施例及实施例中的特征可以相互组合。
SEQUENCE LISTING
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<120> 一种制备罗汉果甜苷代谢产物的复合菌剂及其应用
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Claims (10)
1.一种复合菌剂,包含:普雷沃菌、纺锤链杆、巨单胞菌、拟杆菌、大肠埃氏菌-志贺氏菌、长栖粪杆菌、林斯氏菌、布劳特氏菌、巨球型菌、考拉杆菌、阿利斯佩斯菌、双歧杆菌、狄氏副拟杆菌、粪厌氧棒杆菌、粪球菌、链球菌、颤螺旋菌、瘤胃球菌、多尔氏菌、丁蓖麻球菌、梭状芽胞杆菌XlVa。
2.根据权利要求1所述的复合菌剂,其特征在于,所述普雷沃菌、纺锤链杆、巨单胞菌、拟杆菌、大肠埃氏菌-志贺氏菌、长栖粪杆菌、林斯氏菌、布劳特氏菌、巨球型菌、考拉杆菌、阿利斯佩斯菌、双歧杆菌、狄氏副拟杆菌、粪厌氧棒杆菌、粪球菌、链球菌、颤螺旋菌、瘤胃球菌、多尔氏、丁蓖麻球菌属、梭状芽胞杆菌XlVa的配比为:(95~100):(40~45):(20~24):(15~18):(12~14):(12~14):(10~13):(5~9):(5~9):(5~9):(3~5):(3~5):(3~5):(2~4):(1~3):(1~3):(1~3):(1~3):(1~2):(1~2):1。
3.权利要求1~2任一项所述复合菌剂在制备罗汉果甜苷代谢产物中的应用。
4.根据权利要求3所述的应用,其特征在于,所述罗汉果甜苷代谢产物为罗汉果苷III、罗汉果苷II、罗汉果苷I、罗汉果醇中的至少一种,优选为罗汉果醇。
5.一种制备罗汉果甜苷代谢产物的方法,具体为:以罗汉果甜苷为底物,使用权利要求1~2任一项所述复合菌剂进行厌氧发酵。
6.根据权利5所述的方法,其特征在于,所述厌氧发酵的条件为:150~250rpm、35~39℃下反应20~28h。
7.一种罗汉果甜苷代谢产物,由权利要求5或6所述的方法制备而成。
8.一种罗汉果甜苷代谢产物,包含罗汉果苷III、罗汉果苷II、罗汉果苷I、罗汉果醇中的至少一种,优选为罗汉果醇。
9.根据权利要求8所述的罗汉果甜苷代谢产物,其特征在于,所述代谢产物包含:0.2%~1%罗汉果苷III、1%~3%罗汉果苷II、5%~10%罗汉果苷I、80%~90%罗汉果醇。
10.权利要求8或9所述的罗汉果甜苷代谢产物制备抗氧化产品中的应用。
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