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Title: 迷迭香来源的鼠尾草酸的研究进展与应用前景

迷迭香鼠尾草酸的提取纯化与分析方法

迷迭香鼠尾草酸的提取技术优化与绿色提取方法

迷迭香鼠尾草酸主要从迷迭香(Rosmarinus officinalis)的地上部分分离提取[1]。在提取技术优化方面,多种方法被应用于提升鼠尾草酸的提取效率,其中超声辅助提取(UAE)表现出显著优势,其优势源于对细胞壁的机械作用——通过空化泡破裂改善传质效率、增强溶剂与植物基质的接触,从而缩短提取时间并减少溶剂用量[2]。离子液体超声辅助提取(ILUAE)作为绿色提取方法,效率显著优于传统技术;超临界流体萃取(SFE)通过夹带剂选择、压力温度调控及分步/序贯工艺优化,可实现鼠尾草酸的富集与选择性提取;加压液体萃取(PLE)也具备高效提取能力;微波辅助提取(MWE)因易导致鼠尾草酸降解,效率较低;基于深共熔溶剂(DES)的绿色提取方法及迷迭香水蒸气蒸馏剩余材料的利用也被开发。各提取方法的效率及关键参数如下:

迷迭香鼠尾草酸提取方法的效率及关键参数对比

提取方法 关键条件 鼠尾草酸提取效率/浓度 文献
超声辅助提取(UAE) 单独使用 62.19 mg/g提取物 [3]
超临界流体萃取(SFE) 单独使用 16.33 mg/g提取物 [3]
UAE-SFE联合处理 —— 10.5 mg/g提取物 [3]
超声辅助提取(UAE) —— 33 mg/g [4]
索氏提取(SE) —— 5.7 mg/g [4]
微波提取(MWE) —— 6.8 mg/g [4]
离子液体超声辅助提取(ILUAE) 使用1.0 M [C8mim]Br离子液体 66.23%±3.85% [2]
纯水提取 —— 0% [2]
1.0 M氯化钠溶液提取 —— 0% [2]
超临界流体萃取(SFE) 5%乙醇为夹带剂、15 MPa、313 K、180 min 富含鼠尾草酸的提取物 [5]
超临界流体萃取(SFE) 300 bar、50℃ 含量从3.3 g/100 g提升至33.0 g/100 g提取物 [6]
分步SFE策略(第二步) 添加3% EtOH:Water(50/50 v/v)改性剂、25℃、10 MPa 提取量占比49%(高于纯CO₂步骤的33%) [7]
两步序贯SFE工艺 第二步用含7%乙醇的CO₂、150 bar、40℃、120 min 回收率403.04 mg/g [8]
SFE-分馏工艺 100 bar、50%(v/v)水进料、0.025 PLE提取物/SC-CO₂质量流量比 鼠尾草酸+鼠尾草酚富集率47.81%(wt.) [9]
加压液体萃取(PLE) 200℃、乙醇溶剂、20 min 52.87 mg/g [8]
加压液体萃取(PLE) —— 提取率39.86%(w/w干重),浓度109.0 mg/g [9]
深共熔溶剂(DES)提取 N3333Cl为HBA、1,2-丙二醇为HBD的DES水溶液、84℃、液固比21:1、129 min 14.80 mg/g干重 [10]

在鼠尾草酸的分析方法方面,高效液相色谱(HPLC)是主要定量手段,不同系统通过固定相、流动相及检测波长的组合实现定量分析[5][11][12][13][14];其中一套HPLC方法的标准曲线线性范围为0.1–20.0 mg/mL,相关系数R²达0.999,检出限(LOD)和定量限(LOQ)分别为6.23 μg/mL和22.65 μg/mL[2]。超高效液相色谱-质谱联用(UPLC-MS-DAD)进一步提高了分析的灵敏度和准确性[3];超高效液相色谱-串联质谱(UPLC-MS/MS)则可用于复杂样品检测,通过电喷雾负电离多反应监测(MRM)模式实现精确定量[5]

在鼠尾草酸的纯化方面,制备型液相色谱(LC)可从迷迭香提取物中分离高纯度鼠尾草酸,正己烷预处理可提高纯化效率[15];超临界流体色谱(SFC)使用Viridis SFC 2-乙基吡啶柱时,鼠尾草酸纯度可达92%以上,回收率超过97%[11];离心分配色谱(CPC)选择正己烷/乙酸乙酯/甲醇/水(3:2:3:2,v/v/v)溶剂系统,采用洗脱-挤压模式可在4小时内分离鼠尾草酸和鼠尾草酚,纯度达96.1%±1.0%,回收率为94.3%±4.4%[16];此外,通过5% NaHCO₃溶液处理、H₃PO₄沉淀、真空液相色谱(VLC)和反相HPLC纯化,可获得鼠尾草酸纯品[17]

迷迭香鼠尾草酸的分析方法开发与验证

迷迭香来源鼠尾草酸的分析方法开发与验证涉及高效液相色谱(HPLC)、超高效液相色谱-质谱联用(UPLC-MS、UHPLC-ESI-QTOF-MS)、气相色谱-质谱联用(GC-MS)及电化学方法等技术手段。标准品可通过商业采购(如成都Must Bio-technology co.、Sigma Aldrich,纯度95%或98%)、从迷迭香中分离纯化,或参考Okamura方法制备,其结构需经质谱(MS)或HPLC确证[18][3][19][20][13][21][14]

鼠尾草酸定量分析技术参数汇总

分析技术 核心参数 内标/定量方法 引用
UPLC-MS、UHPLC-ESI-QTOF-MS 定量跃迁m/z 331.2→287.2,定性跃迁m/z 244.1;精确质荷比[M−H]⁻ m/z 331.19 对羟基苯甲酸丁酯(I.S.,跃迁m/z 193.0→92.0)、标准曲线法 [18][22]
UPLC-MS-DAD C18色谱柱(XBridge™ BEH,2.5 µm 2.1×50 mm);含0.1%甲酸的水-乙腈梯度洗脱;230 nm检测;校准曲线1~400.0 μg/mL - [3]
HPLC-DAD(Chromolith柱) Chromolith Performance RP-18e柱;水-甲酸(99.5:0.5)-乙腈流动相;280 nm检测 外标法 [19]
HPLC-PDA(Kinetex柱) Kinetex C18柱(100 mm×4.6 mm×2.6 μm);含0.1%乙酸的水-乙腈梯度洗脱;柱温55℃,流速2.5 mL/min;284 nm检测;样品稀释至5000 ppm,0.45 μm过滤,10 μL进样 外标法(Sigma标准品) [12][13]
HPLC-PDA(LiChrosorb柱) LiChrosorb RP-select B柱(7 μm);含0.5%H₃PO₄和1 mM EDTA的乙腈-水(60:40)流动相;流速2 mL/min;230 nm检测 - [23]
HPLC-PDA(LiChrospher柱) LiChrospher 250-4 RP-18柱(5 μm);含0.1%磷酸的乙腈-水(65:35)流动相;流速1.0 mL/min;230 nm检测 - [14]
HPLC-PDA/ESI-MS Luna C18柱;含2.5%甲酸的水-乙腈梯度流动相;PDA 280 nm定量,ESI-MS定性 - [24]
GC-MS 鼠尾草酸需衍生化为硅烷化产物;HP-5MS毛细管柱;SIM模式监测m/z 335、431、548 - [25]
电化学方法(HMDE-SWV) pH 7.0 BR缓冲溶液;两个还原峰(约52 mV和−17 mV);线性范围10~30 μM(R²=0.999)、40~90 μM(R²=0.9997)、2~9 μM(R²=0.996);检测限1.5 μM - [26]

需注意的是,GC-MS分析中鼠尾草酸可能因热转化生成鼠尾草酚衍生物,需结合HPLC确认真实含量[27]。方法验证方面,部分方法已通过线性、选择性、灵敏度等指标验证,线性范围可达0.100~2.00 μg/g,检测限和定量限基于色谱基线噪声(3倍、10倍空白标准偏差)计算,中间精密度通过改变分析日期、标准溶液和样品批次评估,迁移时间重现性RSD为0.48%,峰面积重现性RSD为4.2%[21][28]。这些方法已成功应用于药代动力学研究(如迷迭香灌胃后血药浓度测定)及实际样品分析,包括迷迭香叶片、愈伤组织提取物[29],不同工艺制备的提取物(油溶性、水分散性、超临界CO₂提取物)[13][14],以及不同提取方法(索氏提取、超声提取)的样品[22]。电化学方法因无需复杂前处理,可直接测定迷迭香提取物中的鼠尾草酸,展现出良好的准确性和精密度[26]

迷迭香鼠尾草酸的含量影响因素与组织分布

迷迭香鼠尾草酸的分析方法以高效液相色谱(HPLC)技术为主,包括反向高效液相色谱(RP-HPLC)和HPLC-DAD(二极管阵列检测器)法,定量方式可通过外标法实现(如以迷迭香酸为外标相对定量,或直接用鼠尾草酸标准品校准[30][15])。不同地区的研究采用了适配的HPLC衍生方法:

不同地区迷迭香鼠尾草酸的HPLC分析方法参数对比

地区 分析方法 关键参数或条件 文献
突尼斯 RP-HPLC 校准曲线:y = 84051x + 240721(R² = 0.9994);LOD = 0.0150 mg·g⁻¹干重;LOQ = 0.0455 mg·g⁻¹干重 [31]
阿尔及利亚 HPLC-DAD 流动相:水/甲酸(99.5/0.5)+ 乙腈(梯度洗脱);检测波长:280 nm [19]

提取方法和溶剂选择显著影响鼠尾草酸的提取效率:超声提取(UE)的鼠尾草酸浓度约为索氏提取(SE)和微波提取(MWE)的6倍(因SE和MWE的高温易导致热敏性鼠尾草酸降解[4]);乙醇提取物中鼠尾草酸含量较高(194.01 mg/g提取物),甲醇提取物较低(91.05 mg/g提取物[29]);浸渍法提取量约为加压液相萃取(PLE)法的三倍[29];正己烷会导致其几乎完全损失,活性炭脱色影响较小[32]

鼠尾草酸的含量受基因型、环境、植物生理状态及栽培条件等多因素调控:基因型上,迷迭香CYP76A基因家族(如CYP76AK6、CYP76AK7、CYP76AK8)的扩张可能影响合成能力[33],不同品种或地区含量差异显著(阿尔及利亚0.01%至1.77%[19],突尼斯部分品种达28.4 mg·g⁻¹干重[31]);环境因素中,季节和温度的影响存在地区差异——突尼斯6月含量最高(平均15.1 mg·g⁻¹干重)、2月最低(8.3 mg·g⁻¹干重),与温度呈正相关(r = 0.30,p < 0.05[31]),西班牙10月至次年2月较高、5-8月较低(范围2.8-4.8 mg·g⁻¹干重[34]),夏季高温可使其下降约50%[35];此外,含量与海拔正相关(r = 0.33,p < 0.05)、与降水量负相关[31],叶片相对含水量(RWC)与含量正相关,太阳辐射和温度则呈负线性关系[34];植物生理上,开花期(春季温和气候)利于积累[36],叶片衰老时含量可增加18%[37];栽培条件中,100 μM茉莉酸甲酯(MeJA)处理悬浮细胞48 h或生物反应器中处理144 h,均能提高鼠尾草酸含量(后者细胞生物量减少[38]);水杨酸(SA)和海藻提取物(SWE)处理24-48 h会抑制合成并促进其氧化为鼠尾草酚,但收获时含量无显著差异[39]

鼠尾草酸在迷迭香中的组织分布具有特异性:叶片含量最高,其次为萼片(约为叶片的70%)、花瓣(约31%),茎中较低,根中未检测到[40];亚细胞层面仅定位于叶绿体[40];愈伤组织中含量极低(0.017-0.156 mg/g),暗培养的非绿色未分化愈伤组织(含2,4-D)中未检测到[29][41]

迷迭香鼠尾草酸的生物活性及应用相关研究

迷迭香来源的鼠尾草酸(CA)是一种具有邻二酚结构的松香烷型二萜类化合物,其抗氧化活性归因于C11和C12位的两个邻位酚羟基,作用机制与α-生育酚相似[3][42]。CA在迷迭香中的含量及提取效率受提取方法、工艺参数、溶剂类型等因素显著影响,不同技术的提取效果差异明显。

不同提取方法及工艺参数对鼠尾草酸(CA)提取效果的影响

提取方法/工艺 关键参数 CA含量/回收率 引用
超声辅助提取(UAE) - 62.19 mg/g提取物(含量最高) [3]
超临界流体萃取(SFE) 无预处理 16.33 mg/g提取物 [3]
超声预处理+SFE - 显著提高CA提取效率 [3]
索氏提取(T7) 甲醇为溶剂 2915.40 ± 33.23 μg/g(显著高于水提和发酵法) [22]
超声甲醇提取(T9) - 有效富集CA [22]
水提法 - 提取量较少(因CA水溶性低) [22]
优化SFE 15 MPa、313 K、5%乙醇共溶剂 256 mg/g提取物 [5]
96%乙醇室温搅拌提取 刀磨机粉碎(0.5-1.4 mm)、液固比未提及、提取2 h 3.3 g/100 g粗提物(占总峰面积14%) [6]
SCCO₂萃取-分级工艺 50℃、300 bar 33.0 g/100 g提取物(较粗提物富集约10倍) [6]
中心复合设计(CCD)优化乙醇-水提取 70%乙醇、5 mL/g液固比、55 min 9.34% w/w(提取物中浓度) [43]
PLE结合SC-CO₂分级工艺 100 bar、50%水进料、0.025 PLE提取物/SC-CO₂质量流量比 CA+鼠尾草酚(CS)质量分数47.81%、回收率78.5% [9]
低共熔溶剂(DESs)提取 N3333Cl为HBA、1,2-丙二醇为HBD、30 wt%水、35℃、液固比20:1、提取120 min 抗氧化活性79.25 ± 0.91 mg TE/g dw(经三元混合物设计优化后) [10]
微波辅助水浸提(MHG) 400 W、250 mL加湿水、20 min 回收80%总酚(含CA),效率为传统2小时水浸提法的6倍 [44]
两步序贯SFE工艺 第一步300 bar、40℃、60 min(去干扰);第二步150 bar、40℃、7%乙醇、120 min CA回收率403.04 mg/g,鼠尾草酚44.56 mg/g(总时间180 min vs 单步300 min) [8]
加压液体萃取(PLE) 200℃、乙醇为溶剂、20 min 52.87 mg/g [8]
超声辅助提取(UAE) 正己烷为溶剂 13%(提取物干重) [8]
二氯甲烷(DCM)提取 50 g粉末+250 mL DCM均质1 h(重复两次) 14.7%(DCME中浓度) [45]

新型绿色溶剂在CA提取中展现出应用潜力。COSMO-RS溶解度预测表明,CA(log Kow为5.13)略比鼠尾草酚(log Kow为4.58)极性低,其溶解度主要受氢键受体(HBA)选择影响:含氯化铵或溴化铵的DESs可降低无限稀释活度系数(ln γ∞),添加十二醇或环己醇等疏水氢键供体(HBD)能进一步降低ln γ∞,而水的加入影响不显著[10]

CA的分析方法包括超高效液相色谱-质谱-二极管阵列检测(UPLC-MS-DAD)、超高效液相色谱-电喷雾电离-四极杆飞行时间质谱(UHPLC-ESI-QTOF-MS)、高效液相色谱(HPLC)、ATR-FTIR光谱及气相色谱-质谱(GC-MS)等。其中:UPLC-MS-DAD采用C18柱、含0.1%甲酸的水-乙腈梯度洗脱、230 nm检测,CA校准曲线浓度范围1~400.0 μg/mL且线性良好[3];UHPLC-ESI-QTOF-MS通过负电离模式检测,CA准分子离子峰为[M−H]− m/z 331.19[22];ATR-FTIR特征峰包括亚甲基C-H伸缩振动(2925、2854 cm−1)、羧基C=O伸缩振动(1719、1687 cm−1)、芳香环骨架振动(1605、1508 cm−1)等[42];HPLC可采用含0.1%磷酸的乙腈-水梯度洗脱(230 nm检测)[11]或65:35乙腈-0.1%磷酸水溶液(230 nm检测)[14];GC-MS需先将CA衍生化为三甲基硅烷衍生物,通过HP-5MS柱及SIM模式检测特征离子[25];紫外分光光度法可通过284 nm吸光度校准曲线(0.5-15 mg/mL)定量CA[6][30]

CA具有多种生物活性,是迷迭香提取物抗氧化能力的主要贡献者,与鼠尾草酚共同占抗氧化活性的90%以上[42][32]。密度泛函理论(DFT)研究显示,CA和鼠尾草酚的抗氧化能力优于迷迭香酸,归因于邻苯二酚基团与邻近氧原子形成的短氢键[8]。在细胞实验中,高含量CA的提取物可发挥抗氧化应激保护作用,效果与没食子酸(GA)和N-乙酰半胱氨酸(NAC)相似[3]。食品应用中,CA添加到菜籽油可显著延长诱导时间[6],添加到熟肉制品60天后保留率达99%[25],在水牛和鸡肉 patties中可显著抑制脂质氧化[14]。抗肿瘤活性方面,CA可剂量依赖性抑制胶质母细胞瘤(GBM)细胞生长[46],富集提取物对HT-29结肠癌细胞及前列腺癌细胞异种移植瘤有显著抑制作用[9][8]。抗菌活性上,CA对多种细菌的MIC值为15-70 μg/mL,优于百里酚[47],对革兰氏阳性菌和阴性菌均有抑制作用[8][48]。抗炎活性方面,CA可抑制巨噬细胞炎症因子表达[8],并作为mPGES-1和5-脂氧合酶的双重抑制剂发挥作用[8]。酶调节上,富含CA的二氯甲烷提取物可显著诱导大鼠肝脏II相酶活性[45]。安全性研究显示,CA口服摄入安全性良好,亚慢性毒性实验中高剂量仅引起可逆的轻微肝脏变化[8]

迷迭香鼠尾草酸的生物合成途径与关键基因

迷迭香鼠尾草酸的生物合成以香叶基香叶基二磷酸为起始底物,经多步酶促反应完成。首先,柯巴基二磷酸合酶RoCPS1与贝壳杉烯合酶类似蛋白RoKSL2(氨基酸序列与SfKSL相似性达85%,登录号KF805859)协同催化生成米拉德二烯[49][50];米拉德二烯可自发芳构化为松香三烯[51],随后由CYP71家族CYP76亚族的铁杉酚合酶RoFS1、RoFS2催化生成铁杉酚[49][52]。RoFS1和RoFS2的功能已通过酵母异源表达及本氏烟草瞬时表达验证,且迷迭香幼叶毛状体中铁杉酚积累模式与RoFS基因表达水平一致[49]。后续氧化步骤涉及多个细胞色素P450酶:CYP76AH24(原称铁杉酚合酶,后因催化松香三烯C-12和C-11位连续氧化生成11-羟基铁杉酚更名)、CYP76AK6、CYP76AK8及CYP76AK7共同参与,其中CYP76AK6和CYP76AK8负责松香烷骨架C-20位连续氧化,CYP76AK7催化米拉德二烯C-20位氧化[52][33]

迷迭香鼠尾草酸相关的含量、提取纯化及分析方法汇总

类别 具体内容 参考文献
含量特征 幼叶鼠尾草酸含量达10.5 mg/g鲜重;幼叶毛状体积累量高于叶片其他组织 [53]
提取纯化 乙酸乙酯室温提取地上部分→Sephadex LH-20真空柱层析→硅胶重力柱层析→正相HPLC(环己烷-丙酮流动相)分离鼠尾草酸及其衍生物 [51]
分析方法 LC-MS检测叶片及毛状体中鼠尾草酸含量;GC-MS鉴定酶促反应产物(铁杉酚、米拉德二烯等) [49][53]

基因表达与鼠尾草酸积累存在紧密关联:RoCPS1、RoKSL2及RoFS基因在幼叶中的表达量显著高于老叶,且受机械损伤抑制[49];茉莉酸甲酯(MeJA)处理可调控相关基因表达,100 μM MeJA处理迷迭香悬浮细胞48 h后,鼠尾草酸含量显著高于对照组[38];此外,转录因子SmERF6异源过表达可显著提高鼠尾草酸积累量,稳定转基因株系含量较野生型提高3倍[54]

鼠尾草酸的抗氧化与抗菌活性及作用机制

迷迭香鼠尾草酸的提取分离与含量影响因素

鼠尾草酸是迷迭香中含量最丰富的酚类二萜之一,属于松香烷型二萜[42][55],其抗氧化活性极强,与迷迭香酚共同贡献了迷迭香提取物超90%的抗氧化活性[42][56]。其抗氧化机制与邻二酚结构相关:该结构使其易氧化为邻醌,且氧化产物(如迷迭香酚、迷迭香二醇、异迷迭香酚等)仍具有抗氧化活性,形成级联抗氧化作用[42][55][57]。具体而言,鼠尾草酸在光照、高温及有氧条件下不稳定,可降解为迷迭香酚、迷迭香二醇、表迷迭香二醇、表异迷迭香二醇、迷迭香二醛、鼠尾草酸甲酯等衍生物[58][59][57],其中带有C11和C12位邻位二羟基的化合物均具有抗氧化活性[55]。此外,其抗氧化活性依赖于游离羧基和酚羟基的共同存在,甲基化修饰会降低效果[60];且抗氧化活性与含量显著相关,含量越高,提取物DPPH自由基清除能力越强(R²=0.988)[11]

在抗菌活性方面,鼠尾草酸是迷迭香提取物抗菌活性的主要贡献成分之一,与迷迭香酸协同抑制细菌生长[61][55]。迷迭香提取物对革兰氏阳性菌(如蜡样芽孢杆菌、甲氧西林敏感/耐甲氧西林金黄色葡萄球菌、粪肠球菌)的抑制效果强于革兰氏阴性菌(如肠炎沙门氏菌、鼠伤寒沙门氏菌、大肠杆菌)[62],且鼠尾草酸含量与抗菌活性正相关[63]

鼠尾草酸的提取分离方法多样,常用HPLC进行定量(C18色谱柱,乙腈-0.1%磷酸水溶液梯度洗脱,检测波长230、280或350 nm[11][14])。其含量受基因型、季节、生物气候条件、提取参数等多种因素影响,例如夏季含量较高[61][57],野生迷迭香新鲜提取物中含量高于灌溉栽培的[20],主要分布于地上部分(叶片含量最高,达10-15mg/g鲜重[56])等。

鼠尾草酸抗氧化活性的影响因素及相关结果

影响因素 具体条件/现象 结果 参考文献
结构特征 邻二酚结构、游离羧基+酚羟基共同存在 邻二酚易氧化为邻醌,氧化产物仍具活性;甲基化修饰降低活性 [42][60][55][57]
降解条件 光照、温度升高、氧气存在 降解为迷迭香酚、迷迭香二醇等衍生物,含C11/C12邻二羟基的衍生物具抗氧化活性 [58][55][59][57]
基质与氧化条件 60℃环境 保护脂质氧化效果优于α-生育酚,氧化产物是高温下活性增强的关键 [56]
乳液体系 油包水乳液、水包油乳液 油包水乳液中活性强于鼠尾草酸和α-生育酚;水包油乳液中弱于Trolox [56]
含量相关性 提取物中鼠尾草酸含量升高 DPPH自由基清除能力增强(R²=0.988) [11]

鼠尾草酸抗菌活性的相关结果

作用对象/条件 具体结果 参考文献
细菌类型选择性 对革兰氏阳性菌抑制效果强于革兰氏阴性菌 [62]
含量相关性 提取物中鼠尾草酸含量越高,抑菌作用越强 [63]
抗李斯特菌活性 20%/40%含量提取物均有活性,40%含量提取物MIC更低;30℃处理24小时效果显著 [56]
低pH和高NaCl条件 抗菌活性增强 [56]
与抗菌药物协同作用 增强四环素、红霉素等活性,对金葡菌增强8倍,对粪肠球菌/屎肠球菌增强16倍 [56]
分离组分对比 含鼠尾草酸的Fr.3组分抗菌活性最高,MIC低于迷迭香酚、优于百里酚 [47]
对特定细菌的浓度依赖性 对Roseomonas gilardii和Xanthomonas campestris,50mg/L即有活性,400mg/L最强 [48]

鼠尾草酸的提取分离方法及效果

提取/分离方法 具体条件 效果 参考文献
乙醇浸渍 70%乙醇浸渍迷迭香叶片10天 得到含鼠尾草酸的提取物 [62]
超临界CO₂萃取(含共溶剂) 添加乙醇为共溶剂,延长萃取时间 鼠尾草酸含量最高达32.60% [11]
两步序贯超临界CO₂萃取 第一步300bar/40℃纯CO₂去干扰;第二步150bar/40℃含7%乙醇的CO₂萃取 回收率达403.04mg/g [8]
加压液体萃取(PLE) 200℃,乙醇为溶剂 提取量52.87mg/g [8]
超声辅助萃取(UAE) 正己烷为溶剂 含量达提取物的13% [8]
氯仿提取+纯化 氯仿提取结合真空液相色谱(VLC)和Sephadex LH-20纯化 分离得到鼠尾草酸 [64]

鼠尾草酸含量的影响因素

影响因素 具体条件/现象 结果 参考文献
季节与生物气候 夏季含量较高;盛花期(春季温和条件)含量较高,果实成熟期(夏季高温)降低;夏季干旱水分胁迫促进氧化降解 季节性变化显著,夏季含量高但干旱易降解,盛花期含量高 [61][57][36]
栽培条件 野生vs灌溉栽培;盐胁迫(高Na⁺);K⁺和Ca²⁺添加 野生新鲜提取物含量高于灌溉栽培的;高Na⁺减少含量,K⁺/Ca²⁺促进积累 [20][56]
发育阶段 3月龄植株叶片15天内含量增加3倍,随后下降至初始水平并稳定 含量随发育阶段波动 [56]
植物体内分布 地上部分(叶片>萼片>花瓣);叶绿体(含量为叶片整体6倍);叶毛状体 叶片含量最高(10-15mg/g鲜重),叶绿体和叶毛状体中积累更多 [56]
收获时间 盛花期(12月中旬) 含量最高达17.74mg/g,提取物抗氧化和抗菌活性最强 [65]

鼠尾草酸的抗氧化活性及作用机制

迷迭香来源的鼠尾草酸(Carnosic Acid, CA)是其提取物中主要的抗氧化活性成分之一,近90%的抗氧化活性可归因于CA和鼠尾草酚[66]。作为迷迭香中含量最丰富的酚类二萜(属于松香烷型二萜)[58][42],CA的抗氧化活性与其结构密切相关:C11和C12位的邻二酚结构易氧化,可作为氢原子供体清除活性氧[67][68];游离羧基和酚羟基是维持活性的必需基团,羧基甲基化或酚羟基乙酰化会显著降低其效果[60];其抗氧化机制还涉及级联效应——自身氧化生成的鼠尾草酚、迷迭香酚等邻二酚衍生物仍具有活性,进一步增强保护[58][55][59][57]。此外,CA可通过抑制Erk/AP-1通路减少ROS生成,发挥紫外线防护作用[66];或激活Nrf2转录因子通路,上调HMOX1等基因表达以抵抗氧化应激[69]

CA的抗氧化活性受多因素调控:其含量与迷迭香提取物的抗氧化潜力显著正相关,且与鼠尾草酚1:1(w/w)混合时效果最佳[70][71];提取方法会影响其含量及活性,超临界CO₂萃取等特定工艺可提升CA得率[8];花期中期(盛花期)CA含量最高(17.74 mg/g),对应提取物抗氧化活性最强[65];但CA稳定性较差,温度、光照和氧气会促进其氧化降解[58][42][59][57],需通过纳米脂质体等包封技术保护[72]。在实际应用中,富含CA的迷迭香提取物表现出优异效果,如抑制肉类脂质氧化、稳定肉品红色度[70][14],且部分配方的自由基清除能力优于合成抗氧化剂BHT[23]

鼠尾草酸(CA)抗氧化相关实验数据及特征总结

类别 具体内容 参考文献
结构与活性关系 邻二酚结构(C11、C12位羟基)为氢原子供体;游离羧基和酚羟基是必需基团 [67][68][60]
级联抗氧化机制 氧化后生成鼠尾草酚、迷迭香酚等仍具抗氧化活性的衍生物 [58][55][59][57]
细胞保护作用 抑制Erk/AP-1通路减少ROS生成,保护人皮肤成纤维细胞和角质形成细胞免受紫外线损伤 [66]
脂质过氧化抑制 抑制人红细胞膜脂质过氧化的IC₅₀值为2.4 μg/mL [60]
光合膜系统保护 维持叶绿体34%初始放氧能力,抑制α-生育酚氧化,减少MDA积累(效果优于抗坏血酸) [73]
成分比例影响 与鼠尾草酚1:1(w/w)混合时抗氧化效果最佳 [70][71]
含量与提取物活性关系 提取物抗氧化活性与CA及鼠尾草酚含量显著正相关 [32]
稳定性特征 温度、光照、氧气促进氧化降解为鼠尾草酚、迷迭香酚等衍生物 [58][42][59][57]
肉类抗氧化应用 含10% CA的提取物使生肉TBARS值降低66%,稳定红色度(a*值) [70][14]
提取物CA含量范围 迷迭香提取物中CA含量为13.4%至70.0% [23]
结构与活性理论依据 抗氧化活性与松香烷型二萜结构中的芳香环C相关 [74]
抗氧化机制假说 可能通过醌甲基化物发挥作用 [75]
DFT计算结果 CA自由基通过邻位氧短氢键提升稳定性,与强抗氧化能力一致 [8]
提取方法优化 超临界CO₂萃取(7%乙醇改性剂)得CA 403.04 mg/g;PLE(乙醇溶剂)、UAE(正己烷)提升提取效率 [8]
花期含量变化 盛花期CA含量最高(17.74 mg/g),对应提取物抗氧化活性最强 [65]
合成抗氧化剂对比 部分富含CA的提取物自由基清除效果强于BHT [23]
油脂应用热稳定性 含CA提取物的油脂blend(SOB6)TPC含量低于TBHQ组,丢弃时间15.9 h、诱导期2.69 h [76]

鼠尾草酸的抗菌活性及协同作用

鼠尾草酸(CA)作为迷迭香中的主要二萜酸成分,具有广谱抗菌活性,作用对象涵盖多种革兰氏阳性菌、真菌及特定病毒,且常通过协同作用增强抗菌效果,其机制与结构特征及对细菌信号通路的干扰密切相关。

CA对不同微生物的抑制活性及关键参数

作用对象 抑制效果及关键参数 参考文献
金黄色葡萄球菌(S. aureus) 抑制AIP诱导的RNAIII和psmα毒力基因表达,最低有效浓度10 μM;对NorA外排泵有抑制作用 [77][78]
痤疮丙酸杆菌(P. acnes) 最低抑菌浓度(MIC)19.5 μg/mL [79]
李斯特菌 含40% CA的提取物MIC为含20% CA提取物的一半;在迷迭香8种主要酚类中活性最强 [56]
芽孢杆菌、肠球菌、链球菌等革兰氏阳性菌 具有抑制作用 [56]
大肠杆菌、沙门氏菌、弯曲杆菌等革兰氏阴性菌 具有抑制作用 [56]
Roseomonas gilardii 50 mg/L即可产生高抑制率 [48]
Xanthomonas campestris 400 mg/L时抑制作用最强 [48]
白色念珠菌(C. albicans) 50 μg/mL显著降低指数生长期细胞活力;抑制生物膜形成及代谢活性 [80][81]
新型隐球菌(C. neoformans) 杀菌效果与白色念珠菌相似;抑制生物膜形成及代谢活性 [80]
呼吸道合胞病毒(hRSV)A/B型 抑制病毒RNA合成及子代病毒产量,对甲型流感病毒无活性 [82]

CA的抗菌活性可通过与其他成分联用显著增强。在细菌抑制中,CA与鼠尾草酚、红霉素联用时,对携带四环素外排泵的金黄色葡萄球菌菌株XU212表现出协同效应[83];10 μg/mL CA可使四环素对XU212的活性增强2倍,使红霉素对携带MsrA的大环内酯耐药菌株活性增强8倍[64]。针对多重耐药(MDR)金黄色葡萄球菌,CA与红霉素联用可使各自MIC分别降低16倍和32倍[78];CA还可增强四环素、红霉素或溴化乙锭对金黄色葡萄球菌的抗菌作用达8倍,对粪肠球菌和屎肠球菌的增强作用达16倍[56]。在真菌抑制中,CA与PP(天然提取物)以1:4比例组合时,对白色念珠菌和新型隐球菌的杀菌效果最强,经等辐射图和部分抑菌浓度指数(FICI)验证为协同作用[84][80][81]

CA的抗菌机制与其结构特征及分子靶点相关:结构上,鼠尾草酚因内酯桥对某些菌株活性更强[83],而CA的羧酸基团是抗hRSV活性的关键[82];分子层面,CA通过抑制NF-κB上游信号通路(Syk、Src、PI3K等磷酸化)减少炎症因子释放[79],干扰细菌群体感应系统抑制毒力基因表达[77],并靶向外排泵增强抗生素敏感性——如对金黄色葡萄球菌SA-1199B的EtBr外排抑制IC50为50 μM(16.6 μg/ml)[64]。这些机制共同赋予CA广谱高效的抗菌活性及协同潜力。

鼠尾草酸的抗炎与细胞保护活性

鼠尾草酸(CA)是迷迭香中的主要酚类二萜成分,其生物活性广泛,涵盖抗氧化、抗菌、抗炎及细胞保护等多个方面。

鼠尾草酸(CA)的抗氧化及细胞保护活性关键数据

活性类型 具体表现 相关机制或结构要求 参考文献
抗氧化活性基础 迷迭香叶提取物近90%的抗氧化活性归因于CA和鼠尾草酸 - [66]
抗氧化活性基础 - 邻二酚结构易氧化,需游离羧基和酚羟基共同维持活性 [68][60]
抑制脂质过氧化 抑制人红细胞膜脂质过氧化的IC₅₀值为2.4 μg/mL - [60]
降低ROS生成 浓度依赖性降低H₂O₂刺激的ROS生成,效果优于N-乙酰半胱氨酸(NAC) - [85]
紫外线保护 对人皮肤成纤维细胞和角质形成细胞发挥紫外线保护作用 减轻Erk/AP-1通路激活和ROS生成 [66]
保护线粒体功能 缓解H₂O₂诱导的线粒体膜电位(MMP)下降 - [85]
增强细胞抗氧化能力 上调谷胱甘肽(GSH)水平 - [60]
细胞保护(神经元等) 提高原代神经元、UN-SH-SY5Y及RA-SH-SY5Y细胞活力,减少LDH释放 - [85]
细胞保护(神经母细胞瘤) 减轻H₂O₂诱导的人神经母细胞瘤IMR-32细胞线粒体功能障碍 - [86]
细胞保护(肝细胞) 改善LPS诱导的肉鸡肝细胞坏死、炎性细胞浸润 - [87]
细胞保护(NaT损伤) 6、12 μM CA对钠taurocholate(NaT)诱导的细胞损伤的保护作用与硫糖铝相当或更强 - [60]
增强抗氧化防御 上调HMOX1、GCLM等抗氧化基因表达 激活Nrf2通路 [69]

抗菌活性方面,CA作为迷迭香的极性成分之一,对金黄色葡萄球菌(S. aureus)和大肠杆菌(E. coli)的抗菌活性强于其他化合物[66];对痤疮丙酸杆菌(P. acnes)的最低抑菌浓度(MIC)为19.5 μg/mL,还可抑制铜绿假单胞菌、白色念珠菌等多种微生物生长[79]

抗炎活性及机制上,CA可有效抑制炎症反应:在脂多糖(LPS)诱导的肉鸡炎症模型中,CA能下调IL-6、TNF-α、IL-1β等促炎细胞因子水平,降低炎症相关因子iNOS的表达[87];对皮肤炎症模型,CA可抑制角质形成细胞和巨噬细胞分泌IL-6、IL-8、MCP-1、TNF-α及PGE₂[79]。其抗炎机制主要涉及信号通路调控:一方面靶向NF-κB激活通路,通过抑制Src、Syk、PI3K、PDK1、Akt、IKK及IκBα的磷酸化减少NF-κB核转位[79];另一方面在LPS诱导的氧化应激模型中降低HSP70、P38 MAPK及ERK的水平[87];同时还可作为mPGES-1和5-脂氧合酶(5-LO)的双重抑制剂,抑制前列腺素E₂(PGE₂)和白三烯的合成[8]

鼠尾草酸的稳定性与代谢产物特征

鼠尾草酸是迷迭香中含量最丰富的酚类二萜化合物,具有较强的抗氧化活性[58][42][55],其抗氧化作用与分子结构中的邻二酚羟基(C11和C12位的两个羟基)密切相关[42][55]。在抗氧化过程中,鼠尾草酸可通过直接清除活性氧(ROS)发挥作用:高效淬灭单线态氧(¹O₂)和羟基自由基,且淬灭单线态氧的效率高于生育酚[88];同时可与生育酚、类胡萝卜素协同保护光合膜免受氧化损伤[55][73],例如高光胁迫下添加鼠尾草酸的叶绿体可维持约34%初始放氧能力,完全抑制α-生育酚氧化为α-生育醌,并减少丙二醛(MDA)积累[73]。值得注意的是,其抗氧化机制具有“级联”特性——氧化降解产物(如鼠尾草酚、迷迭香酚、异迷迭香酚等)因保留邻二酚羟基结构仍具抗氧化活性,形成持续保护[55][57]

鼠尾草酸具有显著抗菌活性[89],但稳定性较差,易受温度、光照和氧气影响降解[58][59]。不同胁迫条件下,其氧化代谢产物及转化特征存在差异,具体如下:

鼠尾草酸在不同胁迫条件下的氧化代谢产物及转化特征

胁迫条件 主要氧化代谢产物 关键转化特征 参考文献
氧气存在下(酶促脱氢/自由基攻击) 鼠尾草酚、迷迭香酚、表迷迭香酚、表异迷迭香酚、迷迭香二醛、甲基鼠尾草酸酯 - [58][42][55][59][57]
强光+极端昼夜温差(1200 μmol photons m⁻² s⁻¹、35°C/5°C) 鼠尾草酚 鼠尾草酸含量显著降低,鼠尾草酚含量约增加3倍 [88]
夏季干旱(水分胁迫) 迷迭香二醛、鼠尾草酚、甲基鼠尾草酸酯 - [57]
O-甲基化反应 12-O-甲基鼠尾草酸 酚羟基被修饰,丧失自由基清除活性但脂溶性增强 [55]

这些代谢产物的抗氧化活性存在差异:鼠尾草酚、迷迭香酚及其异构体仍具较强抗氧化活性,而甲基化产物(如12-O-甲基鼠尾草酸)的抗氧化活性则显著减弱[55][57]

鼠尾草酸的体内外安全性与毒理学特征

鼠尾草酸及其相关迷迭香提取物的体内外安全性与毒理学特征研究显示其具有较低的毒性风险,具体实验数据如下:

鼠尾草酸及迷迭香提取物的毒理学实验结果

实验类型 实验对象 处理条件 主要结果 参考文献
体外细胞实验 细胞 50 μM 鼠尾草酸单独作用 未影响细胞内活性氧水平 [85]
体外抗hRSV实验 细胞 60 μM 或 150 μM 鼠尾草酸处理 未观察到显著细胞死亡 [82]
体内急性毒性实验 大鼠(口服) 鼠尾草酸急性给药 半数致死剂量(LD50)范围为7100 mg/kg体重 [90]
体内长期毒性实验 大鼠 鼠尾草酸长期高剂量给药 体重增长轻微降低;心脏、肝脏和肾脏仅出现微弱病理变化 [90]
体内亚慢性毒性实验 大鼠 迷迭香提取物(含鼠尾草酸与鼠尾草酚组合剂量59-66 mg/kg体重/天)给药 肝脏重量相对增加及中央小叶肝细胞肥大,停药后可完全逆转 [91][8]
体内短期喂养实验 大鼠 迷迭香提取物短期(28天)喂养 未引起临床症状、行为改变或血液及组织学参数异常 [8]
人群暴露安全性评估 人群 天然饮食摄入鼠尾草酸与鼠尾草酚(最大量约1.66 mg/kg体重/天) 儿童安全边际(MOS)为100-2000,成人MOS为200-3000,口服摄入安全性较高 [92]

综合来看,鼠尾草酸无论是体外细胞实验还是体内动物实验均未表现出显著毒性,相关迷迭香提取物的亚慢性及短期实验也仅观察到可逆的轻微肝脏变化。结合人群暴露的安全边际数据,进一步证实了鼠尾草酸口服摄入的安全性。

鼠尾草酸的抗肿瘤与代谢调节作用

鼠尾草酸的抗肿瘤作用及分子机制

鼠尾草酸对多种肿瘤细胞具有显著的增殖抑制作用,效果呈浓度和时间依赖性,且对不同肿瘤细胞的敏感性存在差异;同时可通过诱导细胞凋亡、调控细胞周期、干预信号通路及抑制肿瘤转移/血管生成等多途径发挥抗肿瘤效应。

鼠尾草酸对不同肿瘤细胞的增殖抑制效果(IC₅₀值及相关特征)

肿瘤类型 细胞系 处理时间 IC₅₀值 其他特征 参考文献
胃癌 AGS 24、48、72 h 19.90、18.93、16.57 μg/mL - [93]
胃癌 MKN-45 24、48、72 h 23.96、20.39、17.76 μg/mL - [93]
肺癌 H1299 24、48 h 47.3 μM、27.1 μM - [94]
肺癌 H460 24、48 h 89.6 μM、67 μM - [94]
肺癌 A-549 - - 增殖能力呈剂量依赖性降低 [95]
前列腺癌 PC-3 - 64 μM - [96]
前列腺癌 LNCaP - 21 μM - [96]
前列腺正常上皮 PNT1A - 139.4 μM 显示鼠尾草酸对肿瘤细胞的选择性 [96]
黑色素瘤 B16F10 - 7.08 μM(MTT法)、8.64 μM(BrdU法) - [97]
结直肠癌 Caco-2 24 h 92.1±6.4 μM - [98]
结直肠癌 HT29 24 h 48.5±8.2 μM - [98]
结直肠癌 LoVo 24 h 26.4±2.7 μM - [98]
白血病 HL-60 - 5.7±0.7 μM - [99]
乳腺癌 MDA-MB-231/LNCaP - - MDA-MB-231敏感性高于MCF-7 [100]

诱导细胞凋亡是鼠尾草酸的核心抗肿瘤机制之一,其作用涉及caspase家族激活、线粒体通路调控及凋亡相关蛋白表达失衡。例如,胃癌AGS和MKN-45细胞经处理后Annexin V阳性率升高、caspase-3/-8/-9活性增强[93];肺癌H1299细胞中cleaved caspase-7/PARP上调、BAX/Bcl-2比值改变[94];肝癌Bel7402/MHCC97-H细胞通过NF-κB、TLR4等通路凋亡[101]。此外,鼠尾草酸可增强TRAIL的凋亡诱导作用(如肾癌细胞Caki中通过激活caspase、下调c-FLIP/Bcl-2等[102]),并诱导结直肠癌Caco-2、白血病HL60等细胞出现典型凋亡特征[98][99]

细胞周期调控也是鼠尾草酸的重要作用环节:胃癌AGS细胞G1和G2-M期比例降低[93];黑色素瘤B16F10细胞G0/G1期阻滞并上调p21[97];结直肠癌SW480细胞经衍生物处理后G0/G1期阻滞、CDK4/6下调[103];胶质瘤细胞与替莫唑胺联用可增强G0/G1期积累[104]

信号通路方面,PI3K/AKT/mTOR是关键靶点(如胃癌AGS细胞中mTOR/AKT磷酸化降低[93]、肺癌A-549细胞中该通路剂量依赖性抑制[95]),AMPK通路(H1299、PC-3细胞磷酸化升高[94][96])、自噬(H1299细胞LC3-II积累[94])及ERBB2、STAT3等通路也参与其中[105][90]。衍生物(+)-grandione则通过BiP-ATF4-CHOP轴诱导结直肠癌HCT-116细胞凋亡[106]

此外,鼠尾草酸可抑制肿瘤转移与血管生成:黑色素瘤B16F10细胞迁移/黏附能力降低、上皮间质转化相关蛋白表达改变[107];结直肠癌Caco-2细胞uPA、MMP活性下降[98];同时可抑制HUVEC管形成及鸡胚绒毛尿囊膜血管生成[108][99]

鼠尾草酸的代谢调节效应及相关通路

鼠尾草酸(CA)是从迷迭香等植物中分离的酚类二萜,在代谢调节方面展现出多维度的效应[109],其作用覆盖葡萄糖代谢、脂质代谢等关键环节,并涉及多条信号通路的调控,同时存在一定的安全性考量。

CA在葡萄糖代谢与脂质代谢中的调节效应及机制

代谢类型 模型/细胞系 CA浓度/处理方式 主要效应及机制 参考文献
葡萄糖代谢 棕榈酸处理的肌细胞、3T3-L1脂肪细胞 2 μM 恢复胰岛素刺激的葡萄糖摄取;单独处理提升基础及胰岛素刺激下的葡萄糖摄取水平 [110]
葡萄糖代谢 STZ处理的INS-1细胞 2.5或5 μM 逆转STZ诱导的葡萄糖摄取降低;改善GSIS及胰岛素含量;恢复前胰岛素表达 [111]
脂质代谢 NAFLD模型 - 下调肝脏脂肪生成相关基因(L-FABP、SCD1、FAS、SREBP-1c);上调脂肪分解/氧化相关基因(CPT1、CPT1a) [109][112]
脂质代谢 HFD诱导的大鼠NAFLD模型 剂量依赖性 降低血清ALT、AST、TG、TC、LDL-C水平;提升HDL-C水平;减少肝脏脂质积累 [113]
脂质代谢 OVX合并HFD的小鼠模型 - 抑制体重增加及脂肪组织重量;降低胰岛素、瘦素、TG、FFA水平;减小脂肪细胞大小 [114]

CA的代谢调节效应涉及多条关键信号通路:在胰岛素信号通路中,其可逆转棕榈酸或STZ诱导的IRS-1丝氨酸(Ser307、Ser636/639)磷酸化升高,恢复AKT磷酸化水平以改善胰岛素抵抗[110][111];在能量代谢通路中,CA能激活AMPK及其下游靶点ACC的磷酸化(肌细胞、脂肪细胞、肝脏细胞均存在该效应),且AMPK抑制剂Compound C可部分阻断其对脂肪生成基因的抑制及对PGC-1α、CPT1a的上调[110][112][114];此外,CA可通过调节miR-34a/SIRT1/p66shc通路改善NAFLD,具体表现为逆转HFD诱导的miR-34a高表达与SIRT1低表达,并通过miR-34a依赖方式上调SIRT1以抑制肝细胞凋亡[113]。在脂肪细胞分化调控中,CA可阻断3T3-L1前脂肪细胞的MCE使其停滞于G0/G1期,通过增加C/EBPβ的LIP/LAP比值、改变C/EBPβ亚核定位抑制PPARγ、FABP4等成脂标志物表达[115];在人源hMADS脂肪细胞中,CA还可作为PPARγ拮抗剂,降低UCP1、CPT1M等产热标志物的表达[116]

值得注意的是,CA具有剂量依赖性的肝毒性,使用前需充分评估安全性[109]。尽管如此,其对HFD诱导的NAFLD的改善作用,仍为代谢综合征的防治提供了新的研究方向[109]

鼠尾草酸的提取工艺与制剂优化

鼠尾草酸(CA)是迷迭香中主要的酚类二萜化合物,具有广谱抗肿瘤活性。其抗肿瘤机制涉及细胞周期阻滞与凋亡诱导,例如CA-BSA-NPs处理可使Caco-2和MCF-7细胞的G2/M期阻滞比例显著升高,并诱导细胞凋亡;分子层面则可下调BCL-2和COX-2表达,上调GCLC基因表达[117]。为推动CA的应用,研究围绕其提取工艺优化、纳米制剂开发展开,以解决稳定性与生物利用度问题。

鼠尾草酸对不同肿瘤细胞的抑制活性

细胞株 处理方式 抑制活性指标 文献来源
Caco-2 游离CA IC₅₀ = 8.29 μg/mL [117]
MCF-7 游离CA IC₅₀ = 27.43 mg/mL [117]
22Rv1、LNCaP 含40% CA的迷迭香提取物 抑制细胞活力、降低雄激素受体表达 [8]
MDA-MB-231 游离CA 抑制作用为MCF-7的2倍 [100]
K-562 游离CA(19 μM) 细胞存活率19% [100]
Caco-2 CA-BSA-NPs IC₅₀ = 2.60 μg/mL [117]
MCF-7 CA-BSA-NPs IC₅₀ = 6.02 μg/mL [117]

鼠尾草酸提取工艺参数与效果

提取方法 工艺参数 提取物指标 文献来源
两步序贯超临界CO₂萃取(SFE) 第一步:纯CO₂、300 bar、40 °C、60 min;第二步:7%乙醇改性CO₂、150 bar、40 °C、120 min CA含量 = 403.04 mg/g [8]
超临界CO₂萃取(SFE) 6.6%乙醇改性剂、150 bar、40 °C 有效分离CA等活性成分 [118]
加压液体萃取(PLE) 水+乙醇溶剂、200 °C、20 min 得率≈40%,CA含量=52.87 mg/g [8]
PLE结合SC-CO₂分馏 100 bar、进料水含量50%(v/v)、PLE提取物/SC-CO₂质量流量比0.025 CA+鼠尾草酚富集率47.81%、回收率78.5% [9]
超声辅助萃取(UAE) 正己烷为溶剂 CA含量达干提取物的13% [8]
索氏提取法 甲醇萃取 获得含CA的提取物 [100]

鼠尾草酸纳米制剂的制备与性能

纳米制剂类型 制备方法 包封率 载药量 释药特性(各pH下释放量) 文献来源
CA-BSA-NPs 100 mg BSA+10 mg CA溶于10 mL水,加40 mL乙醇沉淀,16 mM 8%戊二醛交联,12000 rpm离心20 min 40.80% 8.02% pH 1.5≈39%、pH 7.2≈75%、pH 7.9≈80%(释放量最大) [117]
CA-CH-NPs 100 mg壳聚糖溶于20 mL 2%乙酸+10 mg CA,与TPP混合,10000 rpm离心15 min后冻干 42.43% 8.34% 各pH下释放量最低,pH 1.5仅10.3%-11.5% [117]
CA-CL-NPs 8 mg CA丙酮溶液加入40 mg纤维素水悬浮液,搅拌过夜后10000 rpm离心10 min冻干 22.40% 4.16% - [117]

纳米制剂可显著增强CA的抗肿瘤活性,例如CA-BSA-NPs能将Caco-2和MCF-7细胞的IC₅₀值分别降至2.60 μg/mL和6.02 μg/mL[117],远低于游离CA的对应值。

鼠尾草酸的联合用药及协同效应

迷迭香来源的鼠尾草酸(CA)具有显著的抗肿瘤活性,可通过多种机制抑制肿瘤细胞增殖、诱导凋亡及分化,并与多种药物或天然化合物产生协同效应,有望成为肿瘤治疗中联合用药的潜在候选物。其抗肿瘤作用及协同效应的具体表现与分子机制因作用细胞类型及联合对象的不同而存在差异,具体数据如下:

鼠尾草酸(CA)的抗肿瘤作用及协同效应机制

作用类型 细胞/联合对象 具体效应 分子机制 参考文献
单独抑制活性 B16F10黑色素瘤细胞 诱导G0/G1期细胞周期阻滞,抑制细胞生长 上调p21表达、下调p27表达 [97]
协同促进分化 AML细胞(联合1,25D3) 促进CD14和CD11b表达,增强细胞分化 激活AP-1增强VDR和RXRα的表达及转录活性 [119]
诱导凋亡 Bel7402和MHCC97-H肝癌细胞 诱导细胞凋亡 抑制NF-κB、caspase-3等通路 [101]
协同抑制增殖 HL-60白血病细胞(联合三氧化二砷) 协同抑制细胞增殖 调控PTEN/Akt信号通路 [90]
协同增强毒性 U251和LN229胶质瘤细胞(联合TMZ) 增强TMZ的细胞毒性,促进凋亡、诱导周期阻滞、激活自噬 上调cleaved PARP和cleaved Caspase-3,诱导G0/G1期阻滞,增加LC3-II积累、降低p62表达;抑制PI3K/AKT通路增强自噬 [104]
协同增强毒性 B16F10黑色素瘤细胞(联合BCNU/CCNU) 增强BCNU和CCNU的细胞毒性 协同诱导G2/M期阻滞 [97]
协同促进凋亡 AML细胞(联合AraC+1,25D3) 增加细胞凋亡和总细胞死亡 增强DNA损伤及DNA损伤反应(DDR);上调Bim表达 [120]
协同抑制活性 HLF和RLF肺成纤维细胞(联合RA) 抑制细胞活性 激活p38 MAPK和Akt通路、下调p21表达 [121]
逆转耐药性 Tz耐药SKBR-3细胞(联合Tz) 恢复Tz敏感性,协同诱导周期阻滞 诱导G0/G1期阻滞,抑制ERBB2信号通路 [105]
增强药物摄取 耐药细胞(联合阿霉素) 增加阿霉素的细胞内浓度,增强毒性 抑制P-糖蛋白(P-gp)表达 [122][90]

CA的抗肿瘤作用机制具有多靶点、多通路的特点,无论是单独作用还是联合用药,均能通过调控细胞周期、凋亡、分化相关通路或逆转耐药性发挥效应。上述研究表明,CA通过精准作用于不同肿瘤细胞的关键信号通路,实现了对肿瘤生长的有效抑制及与多种药物的协同增效,为其临床应用提供了实验依据。

鼠尾草酸的体内外药效学特征

鼠尾草酸在抗肿瘤领域展现出广谱的体外药效学活性,其对多种肿瘤细胞的增殖抑制呈浓度和时间依赖性,并具有一定的肿瘤细胞选择性。此外,其在代谢调节方面可改善胰岛素抵抗、调节脂肪细胞功能及脂质代谢,还能通过抑制血管生成发挥抗肿瘤作用。

鼠尾草酸对不同细胞的增殖抑制活性及相关效应

细胞类型 细胞系 关键效应指标 参考文献
胃癌细胞 AGS 24、48、72 h IC₅₀值分别为19.90、18.93、16.57 μg/mL [93]
胃癌细胞 MKN-45 24、48、72 h IC₅₀值分别为23.96、20.39、17.76 μg/mL [93]
非小细胞肺癌 H1299 24、48 h IC₅₀值分别为47.3 μM和27.1 μM [94]
非小细胞肺癌 H460 24、48 h IC₅₀值分别为89.6 μM和67 μM [94]
前列腺癌 PC-3 IC₅₀值为64 μM [96]
前列腺癌 LNCaP IC₅₀值为21 μM [96]
正常前列腺上皮 PNT1A IC₅₀高达139.4 μM(显示肿瘤细胞选择性) [96]
肝癌 Bel7402、MHCC97-H 鼠尾草酸纳米粒可诱导细胞凋亡 [101]
结直肠癌 HCT116(衍生物化合物14) IC₅₀低至9.8 μM,对p53突变CRC细胞更敏感 [103]
胶质瘤 U251、LN229 10 μM可增强替莫唑胺(TMZ)抗肿瘤效果 [104]
黑色素瘤 B16F10 MTT和BrdU实验IC₅₀分别为(7.08 ± 0.14)μM和(8.64 ± 1.02)μM;抑制克隆形成与划痕愈合 [97]
乳腺癌 SKBR-3(ERBB2+) IC₅₀为27.5 μM [105]
乳腺癌 BT474(ERBB2+) IC₅₀为37.5 μM [105]
肝星状细胞 HLF 20 μM抑制细胞活力并诱导凋亡 [121]
肾癌细胞 Caki 单独处理无凋亡诱导作用,但增强TRAIL介导的凋亡 [102]
急性髓系白血病 AML细胞 10 μM增强AraC的细胞毒性 [120]
神经母细胞瘤 IMR-32 IC₅₀为30 μM [123]
结肠癌细胞 Caco-2 IC₅₀为92.1±6.4 μM [98]
结肠癌细胞 HT29 IC₅₀为48.5±8.2 μM [98]
结肠癌细胞 LoVo IC₅₀为26.4±2.7 μM [98]
前列腺癌 DU-145 6.25 μg/ml浓度显著降低细胞活力 [100]
肝癌 Hep-3B 6.25 μg/ml浓度显著降低细胞活力 [100]
白血病 K-562 6.25 μg/ml浓度显著降低细胞活力 [100]
乳腺癌 MCF-7 6.25 μg/ml浓度显著降低细胞活力 [100]
乳腺癌 MDA-MB-231 6.25 μg/ml浓度显著降低细胞活力 [100]
乳腺癌 184-B5/HER 抑制非锚定依赖(AI)克隆形成,IC₅₀浓度下效力仅次于鼠尾草酚(CSOL) [124]
肝癌 HepG2 对细胞活力的抑制作用较迷迭香提取物和鼠尾草酚更显著,呈浓度和时间依赖性 [125]
脐静脉内皮细胞 HUVEC 10–100 μM浓度下增殖抑制与对照组差异显著(p < 0.01) [108]
牛主动脉内皮细胞 BAEC 增殖抑制IC₅₀为36.3 ± 2.5 μM [99]
脐静脉内皮细胞 HUVEC 增殖抑制IC₅₀为36.0 ± 1.1 μM [99]
白血病 HL60 增殖抑制IC₅₀为5.7 ± 0.7 μM(肿瘤细胞抑制活性更强) [99]
纤维肉瘤 HT1080 增殖抑制IC₅₀为9.0 ± 4.8 μM(肿瘤细胞抑制活性更强) [99]

抗肿瘤机制

鼠尾草酸的抗肿瘤机制主要涉及细胞凋亡诱导、细胞周期阻滞及信号通路调控,且常与化疗/放疗联用发挥协同或增敏作用:

  • 胃癌AGS和MKN-45细胞中,20、25 μg/mL处理24 h可提高Annexin V阳性率,激活caspase 3、8、9并诱导PARP cleavage,增加sub-G1期细胞比例[93]
  • 非小细胞肺癌H1299细胞中,50 μM处理12、24 h上调cleaved caspase-7和cleaved PARP水平[94]
  • 前列腺癌PC-3细胞中,抑制Akt Ser473、mTOR及p70 S6K的磷酸化[96]
  • 结直肠癌SW480细胞中,衍生物化合物14将细胞周期阻滞于G0/G1期,下调CDK4、CDK6表达[103]
  • 胶质瘤细胞中,与TMZ联用增强G0/G1期阻滞,促进cleaved PARP和caspase-3表达,诱导自噬(LC3-II积累、p62减少)[104]
  • 黑色素瘤B16F10细胞中,抑制增殖和黏附,下调迁移相关标志物及Akt、FAK、Sr磷酸化[126];与放疗联用降低细胞存活率并增加凋亡[127];诱导G0/G1期阻滞,上调p21、下调p27表达[97];增强BCNU和CCNU细胞毒性[97]
  • 乳腺癌细胞中,与曲妥珠单抗(Tz)联用诱导G0/G1期阻滞,上调CDKN1B/p27KIP1,抑制ERBB2通路,恢复Tz耐药SKBR-3细胞敏感性[105]
  • 肝星状HLF细胞中,20 μM诱导G0/G1期阻滞,与迷迭香酸联用激活p38 MAPK和Akt通路[121]
  • 肾癌Caki细胞中,通过下调c-FLIP和Bcl-2(泛素-蛋白酶体途径)、上调DR5、Bim和PUMA(CHOP依赖转录激活)增强TRAIL敏感性[102]
  • AML细胞中,与D2联用增强AraC诱导的DNA损伤和凋亡[120]
  • 结肠癌细胞Caco-2中,诱导凋亡,抑制黏附、迁移及uPA、MMP-2/9活性,下调COX-2表达[98]
  • 神经母细胞瘤IMR-32细胞中,通过ROS介导p38激活诱导凋亡[123]
  • HL-60白血病细胞中,低浓度(<7.5 μM)诱导G0/G1阻滞并上调p21WAF1和p27Kip1,高浓度(10-20 μM)通过PTEN/Akt调节诱导凋亡[123]
  • 肝癌HepG2细胞中,剂量依赖性上调caspase-3水平,50 μM和100 μM时cleaved caspase-3表达显著增加(P< 0.05和P< 0.01)[125]
  • BAEC、HUVEC、HL60和HT1080细胞中,10 μM以上诱导染色质浓缩、DNA片段化及sub-G1期细胞增加,激活HL60细胞caspase-3/7[99]

此外,鼠尾草酸通过抑制血管生成发挥抗肿瘤作用:50 μM显著抑制HUVEC管形成(p < 0.001),100 μM完全抑制[108];10 μM以上抑制VEGF刺激的HUVEC迁移(p < 0.05)[108];下调内皮细胞MMP-2活性[99];鸡胚绒毛尿囊膜(CAM)实验中,5 nmol/CAM剂量完全抑制血管生成且不影响VEGFR2激酶活性[99]

代谢调节作用

鼠尾草酸可改善胰岛素抵抗、调节脂肪细胞功能及脂质代谢:

  • 棕榈酸处理的肌肉细胞和3T3-L1脂肪细胞中,2 μM恢复胰岛素刺激的葡萄糖摄取、GLUT4转位及Akt磷酸化,抑制IRS-1丝氨酸磷酸化、JNK及mTOR/p70S6K通路,激活AMPK/ACC通路[110]
  • STZ处理的INS-1胰岛细胞中,2.5、5 μM减轻细胞毒性,恢复葡萄糖刺激的胰岛素分泌(GSIS)及Pro/Insulin表达,降低ROS和MDA水平,激活PI3K/AKT/PDX-1通路[111]
  • 人源hMADS脂肪细胞中,10 μM抑制产热标志物UCP1、CPT1M及脂肪生成标志物FABP4表达,对PPARγ的拮抗作用强于PPARα且效应可逆[116]
  • 卵巢切除(OVX)小鼠中,0.02%饮食抑制体重及脂肪组织重量增加,降低胰岛素、瘦素、甘油三酯(TG)和游离脂肪酸(FFA)水平[114];激活AMPK/ACC通路,下调SREBP1c和FAS,上调PPARα和CPT-1,下调PPARγ、aP2和LPL[114]
  • 高脂饮食(HFD)诱导的NAFLD大鼠中,30、60 mg/kg/day降低血清ALT、AST、TG、TC、LDL-C水平,升高HDL-C[113];下调miR-34a并激活SIRT1/p66shc通路[113]
  • Le大鼠中,富含鼠尾草酸的迷迭香提取物饮食增加脂联素水平(RELe/RCTLe = 1.47,p = 0.045),降低IL-1β(RELe/CTLe = 0.48;p = 0.032)和TNF-α水平[128];调节脂质代谢相关基因(上调线粒体脂肪酸代谢基因、PPARGC1A、LPIN2及ABC转运蛋白)[128]
  • 肝癌HepG2细胞中,上调Nrf2、Sestrin2和MRP2的蛋白和mRNA水平,可能参与化学预防[216,22]。

鼠尾草酸的神经保护与其他生理活性

鼠尾草酸(CA)作为迷迭香中的关键酚类二萜成分,具有多维度的神经保护活性,其作用机制涉及抗氧化、抗炎、调控细胞信号通路及抗凋亡等方向,并在帕金森病(PD)、阿尔茨海默病(AD)等神经退行性疾病模型中展现出明确的保护作用,同时具备良好的安全性与临床转化潜力。

一、CA的核心神经保护机制及基础活性

CA的神经保护作用以抗氧化与Nrf2通路调控为核心:一方面通过直接S-烷基化Kelch样ECH相关蛋白1(Keap1)的半胱氨酸151位点保护脑细胞免受氰化物损伤[129];另一方面选择性诱导PC12h细胞表达II相抗氧化酶(HO-1、NQO1、γ-GCL),调节细胞内氧化还原状态以抵御ROS介导的损伤[129]。在H₂O₂诱导的细胞损伤模型中,CA(0.5–10 μM)可浓度依赖性提高原代神经元及SH-SY5Y细胞存活率(最高达NAC抗氧化效率的128.27%)、清除细胞内ROS(效果优于1 mM NAC),并缓解线粒体膜电位(MMP)下降[85]。此外,CA作为前亲电药物(PED),在氧化应激条件下可转化为醌类活性形式,靶向触发KEAP1/NRF2/ARE转录活性,产生内源性抗氧化酶并减少副作用[130];其抗记忆丧失特性主要归因于对记忆损伤因素的抑制作用,且与迷迭香中黄酮类、三萜类等成分的协同抗氧化活性相关[131]

二、神经退行性疾病模型中的靶向作用

  • PD模型:在6-OHDA诱导的SH-SY5Y细胞模型中,CA可提高细胞活力、增加谷胱甘肽(GSH)水平、激活Nrf2通路及ARE-荧光素酶报告基因活性,同时降低活化的caspase-3、PARP激活水平、ROS含量及核损伤,并增强JNK磷酸化和p38激活[132][133];在6-OHDA诱导的PD大鼠模型中,CA通过诱导抗氧化酶表达、抑制细胞凋亡改善行为学表现[134][135],还可通过上调parkin表达增强泛素-蛋白酶体系统功能,减轻细胞死亡[90]
  • AD模型:在Aβ寡聚体诱导的原代神经元及体内模型中,经鼻给予CA(10 mg/kg体重)可增加突触和树突标志物表达,减少海马区Aβ斑块、星形胶质细胞增生及磷酸化tau蛋白染色[134];行为学实验显示,CA可改善Aβ处理小鼠的被动回避学习和空间Y迷宫交替得分,减少海马CA1区退行性神经元数量[136]。此外,CA对乙酰胆碱酯酶(AChE)和丁酰胆碱酯酶(BChE)的抑制率分别为37%和29.3%[132],与Rivastigmine存在4个共同药效团位点(2个氢键受体、1个芳香环、1个疏水位点)[137];在SH-SY5Y细胞中,CA可通过激活α-分泌酶TACE减少Aβ分泌,并抑制Aβ诱导的凋亡[90]

三、抗凋亡调控及其他生理活性

CA可通过调控凋亡相关通路发挥保护作用:在丙烯酰胺(ACR)诱导的神经毒性模型中,CA(20、40 mg/kg)可改善小鼠运动障碍,降低脑组织丙二醛(MDA)水平、增加GSH含量,并下调Bax/Bcl2比值及活化的caspase-3表达[138];在5K诱导的小脑颗粒神经元(CGNs)凋亡模型中,通过激活PI3K通路(非下游Akt或MEK/ERK信号)发挥保护作用[139];在缺氧PC12细胞中,通过激活PI3K/Akt/NF-κB轴、减少MAPK磷酸化抑制凋亡,并下调COX-2等炎症标志物表达[135]

除神经保护外,CA相关提取物还具有其他生理活性:含40% CA的迷迭香提取物(RE)可改善DSS诱导的结肠炎小鼠疾病活动指数(DAI)及肠道屏障完整性[140];迷迭香萜类成分(以CA为代表)通过nAChR介导机制控制慢性疼痛进展[141];含CA的迷迭香提取物可改善AD模型大鼠的空间记忆及焦虑样行为[142],且CA与迷迭香酸联用可协同增强抗氧化效果[129]

四、安全性与临床转化潜力

CA已被美国FDA列入“一般认为安全”(GRAS)清单[134],口服生物利用度良好且可分布至大鼠脑内[90];其急性口服LD50约为7100 mg/kg,长期高剂量仅引起轻微体重增长减缓及弱病理改变[90]。此外,CA还具有抗病毒活性(抑制人呼吸道合胞病毒复制及基因表达[90]),并可在IL-27刺激的TR146细胞中剂量依赖性降低CXCL9、CXCL10、CXCL11生成,抑制STAT1、STAT3、Akt磷酸化[143]

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