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黑加仑提取物的抗氧化活性与应用及其对胃癌细胞增殖的抑制作用
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摘要
目前,人工合成抗氧化剂被广泛应用于食品中抑制脂肪氧化,并取得了很好的效果,但是,出于对食品安全性的考虑,其应用已受到限制,因此,研究开发植物来源的天然抗氧化剂以取代合成抗氧化剂具有十分重要的意义。黑加仑富含多种生物活性成分,如维生素、多酚、酚酸等,是天然抗氧化剂的良好来源,不仅能够做为抗氧化剂应用在食品中,还具有有益人体健康的潜在功效,如抗癌、清除体内自由基等。本课题以黑加仑冻果为原料,制备了具有强抗氧化活性和高花色苷含量的黑加仑提取物,研究了提取物的抗氧化活性和稳定性,以及在肉糜和色拉酱中的抗氧化效果,同时,还研究了黑加仑提取物诱导肿瘤细胞凋亡,以及对人胚肺成纤维细胞免于受到H202损伤的保护作用。研究内容和研究结果如下:
     1、通过单因素试验确定黑加仑提取物的最佳制备条件。选择乙醇溶液为提取溶剂,最终确定乙醇体积分数为40%,提取时间2h,该条件下所得的提取物具有最佳的花色苷含量和抗氧化能力。将提取物于40℃旋转蒸发,所得浓缩液中多酚含量为12.2mg/mL,花色苷含量为4.1mg/mL,该浓缩液用于后续试验。
     2、对黑加仑提取物的抗氧化活性进行评价,将25mg/mL提取物与0.01%BHA和0.01%抗坏血酸的抗氧化能力分别进行对比,黑加仑提取物的还原能力、2,2-二苯基-1-间三硝基苯基联肼(DPPH)自由基、2,2’-氨基-二(3-乙基-苯并噻唑啉磺酸-6)铵盐(ABTS)自由基和超氧自由基清除率均显著高于抗坏血酸和BHA(P<0.05),但是,提取物的羟基自由基清除率显著低于抗坏血酸和BHA(P<0.05)。
     2、应用液相色谱-质谱联用仪分析黑加仑提物中的多酚成分。提取物中主要有6种花色苷,分别为矢车菊素-3-O-芸香糖苷、飞燕草素-3-O-芸香糖苷、矢菊素-3-O-葡萄糖苷、飞燕草素-3-O-葡萄糖苷、芍药花青素-3-O-芸香糖苷、天竺葵色素-3-O-芸香糖苷,占总峰面积的52.1%,其中前四种花色苷占总花色苷的88.8%;其他多酚物质分别为杨梅酮芸香糖苷、杨梅酮葡萄糖苷、槲皮素-3-O-芸香糖苷、槲皮素葡萄糖营、山奈黄素芸香糖苷、异鼠李素芸香糖苷和三柰酚葡萄糖苷,占总峰面积的47.9%。
     3、对黑加仑提取物的抗氧化稳定性以及提取物中花色苷的稳定性进行研究:
     (1)将花色苷含量为100mg/mL的黑加仑提取物在60℃、80℃和100℃加热1~5h,测定提取物的花色苷含量和抗氧化活性,结果表明,加热导致提取物中的花色苷含量降低,其降解符合一级动力学反应,随着温度的增加,反应速率常数k增加,半衰期t1/2降低,反应活化能为71.97KJ/mol。随着加热温度的升高和加热时间的延长,花色苷的DPPH自由基、ABTS自由基、超氧自由基和羟基自由基清除率以及还原能力均有不同程度的下降,温度越高、加热时间越长,降低的越多。
     (2)将花色苷含量为100mg/mL的黑加仑提取物在室外自然光、室内自然光和避光条件下放置至25d,测定提取物中的花色苷含量和抗氧化活性,结果表明,光照导致提取物中的花色苷含量逐渐降低,降低顺序为:室外自然光>室内自然光>避光。花色苷的降解符合一级动力学反应,室外自然光放置时,一级反应速率常数k最高,半衰期t1/2最短,室内自然光放置和避光放置的反应速率常数均较自然光放置的低,半衰期也增加。光照方式对提取物清除DPPH自由基、ABTS自由基、超氧自由基、羟基自由基的能力和还原能力的降低顺序为:室外自然光>室内自然光>避光,且放置时间越长,抗氧化能力降低的越多。
     (3)将pH3-7的黑加仑提取物于室内自然光条件下放置至15d,测定花色苷含量、DPPH自由基、ABTS自由基清除率和还原能力。结果表明,不同pH提取物呈现不同的颜色,pH增大,最大吸收波长发生红移,pH低时,抗氧化能力比较稳定,在放置过程中降低的幅度较小,pH高时,抗氧化能力降低的较快。
     4、将添加量为5g/kg、10g/kg和20g/kg的黑加仑提取物添加到肉糜中,4℃冷藏9d,测定肉糜的TBARS值、羰基含量、巯基含量和色差值。结果表明,黑加仑提取物能够降低肉糜的TBARS值,抑制脂肪氧化,且添加量越大,抑制效果越强;提取物能够降低羰基的含量和减少巯基的损失,抑制了蛋白的氧化,但抑制效果不如抑制脂肪氧化的效果明显;此外,黑加仑提取物能增加肉糜的红度值,保持肉糜鲜红的色泽。
     5、将添加量为2.5、5和10g/kg的黑加仑提取物添加到色拉酱中,25℃贮藏6周,测定色拉酱的POV值、TBARS值、粘度和红度值。结果表明,黑加仑提取物能降低色拉酱的POV值和TBARS值,抑制脂肪氧化,同时,也能降低色拉酱的粘度,’提高红度值。对多酚和花色苷在液相中分布的测定结果表明,大部分多酚和花色营分布在液相中,在液相发挥其抗氧化作用。
     6、将2.5、5、10、15和20mg/mL的黑加仑提取物作用于胃癌SGC-7901细胞12、24和48h,提取物能够以剂量依赖和时间依赖的方式抑制细胞增殖,12、24和48h时的IC50分别为12.7,10.2和9.0mg/mL;通过倒置显微镜和荧光显微镜观察到,经黑加仑提取物作用以后,细胞出现典型的凋亡特征,细胞收缩,胞质浓缩,形成胞浆丝,细胞核固缩浓染,荧光强度增加,部分细胞颜色发白,呈碎块状致密浓染;流式细胞检测结果进一步说明了黑加仑提取物能够诱导SGC-7901细胞发生凋亡。7、黑加仑提取物对人胚肺成纤维细胞MRC-5具有保护作用,使其较少受到H2O2的损伤作用。黑加仑提取物能够提高细胞的存活率,荧光显微镜观察和流式细胞检测结果说明发生凋亡的细胞数量减少,并且,提取物可提高细胞内SOD,CAT和GSH-Px三种酶的活力,对细胞内的MDA有清除作用。
Synthetic antioxidants are commonly applied in foods to inhibit lipid oxidation, being consumed in appreciable quantities by humans. However, the use of such synthetic antioxidants has been associated with potential health risks resulting in their strict regulations in food applications. Consequently, there is a practical need for the development of natural antioxidants from plant as effective alternatives in the prevention of food deterioration. Black currant is rich in variety of bioactive components, such as vitamins, phenolics and phenolic acid; it is a good source of natural antioxidants, in addition, it possesses the potential health benefit, such as anticancer and scavenging radicals in vivo. The objectives of this research were to prepare black currant extract with high anthocyanins content and antioxidant activity, and evaluate its antioxidant activity and stability. The antioxidant effects of black currant in pork patties and salad dressing were evaluated. In addition, its antiproliferative ability on gastric cancer SGC-7901cells and the protective effect on human embryonic lung fibroblast cells MRC-5damage by H2O2were also investigated.
     1. The optimal extract condition for preparing black currant extract was determined by single factor experiment. The black currant extract with high anthocyanins and antioxidant activity was extracted with40%ethanol for2h which was then concentrated by rotary vacuum evaporator at40℃. The total anthocyanins content and phenolic content of the concentrated black currant extract were4.1mg/mL and12.2mg/mL, respectively.
     2. Compared with0.01%BHA and0.01%ascorbic acid,25mg/mL black currant extract exhibited higher reducing power,1,1-diphenyl-2-picrylhydrazyl (DPPH),2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) and superoxide radicals scavenging activity, but lower hydroxyl radical scavenging activity (P<0.05).
     3. The stabilities of anthocyanins in black currant extract and the antioxidant activity of black currant extract were investigated.
     (1) The black currant extract containing100mg/mL anthocyanins was heated at60℃,80℃and100℃for1-5h and the anthocyanins content and antioxidant activity were evaluated.A reduction of anthocyanins content was observed during heating which followed first-order reaction kinetics. The reaction rate constant increased and the half-time decreased with the increasing heating temperature. The activation energy of the thermal degradation of anthocyanins was71.97KJ/mol. The DPPH, ABTS, superoxide and hydroxyl radicals scavenging activity and reducing power were also decreased with increasing heating temperature and time.
     (2) The black currant extract containing100mg/mL anthocyanins'was placed in outdoor natural light, in indoor natural light and in dark for25d and the anthocyanins content and antioxidant activity were evaluated. The anthocyanins content decreased during storage as:outdoor light> indoor light> dark. The degradation of anthocyanins followed first-order reaction kinetics. The highest reaction rate constant and the lowest half-time were observed when the black currant extract was exposed to outdoor natural light, which were higher and lower than that of the black currant extract stored in indoor natural light and in dark, respectively. The DPPH, ABTS, superoxide and hydroxyl radicals scavenging activity and reducing power were also decreased (outdoor light> indoor light> dark).
     (3) The black currant extract at pH3-7was stored for15days in indoor natural light. The black currant extract exhibited different color at various pH and the maximum absorption wavelength shift to red at high pH. The black currant extract showed the stable antioxidant activity at low pH which decreased a lot at high pH during storage.
     4. The pork patties added with5,10and20g/kg black currant extract were stored at4℃for9days and the TBARS value, carbonyl content, sulfydryl content and color were determined. The black currant extract treatments significantly decreased the TBARS value and carbonyls conformation, reduced the sulfhydryl loss of pork patties in a dose-dependent manner, which showed the black currant extract had a significant inhibition to lipid and protein oxidation. The black currant extract treated patties showed significant higher redness (P<0.05) than control.
     5. The salad dressing added with2.5g/kg,5g/kg and10g/kg black currant extract were stored at25℃for6weeks and the POV value, TBARS value, viscosity and red color were determined. The black currant extract treatments significantly decreased the POV value and TBARS value to inhibited lipid oxidation. The salad dressing added with black currant extract showed lower viscosity and higher red color than control. Most of the anthocyanins and phenolics in black currant extract were present in the aqueous phase to inhibit lipid oxidation in salad dressing.
     6. The black currant extract inhibited the proliferation of SGC-7901cells in a dose-and time-dependent manner, and the IC5o were12.7,10.2and9.0mg/mL for12,24and48h, respectively. Morphologic observations with inverted and fluorescence microscopes yielded vivid evidence of cell shrinkage, formation of cytoplasmic filaments, condensation of nuclear chromatin, and cell apoptosis in the presence of black currant extract. Flow cytometric analysis also showed that black currant extract treatment resulted in marked reductions of viable cells.
     7. The black currant extract could protect the human embryonic lung fibroblast cells MRC-5from H2O2induced cytotoxicity. The black currant extract treated cells showed higher cell viability; and the morphologic observations and flow cytometric analysis confirmed the reduction of apoptosis cells. The cytoprotective effect of black currant extract was associated with the decreases in the MDA level and increases in the GSH, SOD and CAT activity in treated MRC-5cells.
引文
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