羊栖菜多糖对S180荷瘤小鼠红细胞相关生化功能影响的研究

 目的分析羊栖菜多糖对S₁₈₀荷瘤小鼠红细胞相关生化功能影响的研究。方法建立肿瘤动物模型,分高、中、低剂量腹腔给予羊栖菜多糖7 d,采集红细胞,制备红细胞悬液,运用激光共聚焦扫描技术测定荷瘤小鼠红细胞内[Ca²⁺]的变化;运用相关试剂盒测定红细胞膜表面唾液酸含量和Na⁺,K⁺-ATPase及Ca²⁺,Mg²⁺-ATPase活性的变化;用流式细胞仪分析红细胞膜电位水平的变化;采用高效毛细管电泳法测定红细胞电泳合淌度的变化。结果羊栖菜多糖能降低荷瘤小鼠红细胞内[Ca²⁺],升高膜表面唾液酸的含量,增强膜表面Na⁺,K⁺-ATPase及Ca²⁺,Mg²⁺-ATPase的活性,提高红细胞膜电位水平,提高红细胞的电泳合淌度。结论羊栖菜多糖可调节或恢复S₁₈₀荷瘤小鼠红细胞多种生理生化功能。     

褐藻中高相对分子质量褐藻多酚的抗氧化活性研究

目的　评价鼠尾藻和海黍子两种褐藻中高相对分子质量褐藻多酚的抗氧化活性。方法　分别利用 3种体系 ,通过对羟自由基 (· OH)、超氧阴离子 ( O÷2 )和 1,1-二苯基 - 2 -苦味肼基自由基 ( DPPH· )清除效率来评价其抗氧化活性。结果　两种褐藻中高相对分子质量褐藻多酚对· OH、O÷2 和 DPPH·均有很高的清除效率 ,且效果相近。结论　鼠尾藻和海黍子两种褐藻中高相对分子质量褐藻多酚具有较强的抗氧化活性 ,是一类潜在的海洋生物天然抗氧化剂。     

半叶马尾藻多糖对［60Co］γ射线损伤小鼠骨髓细胞的影响

目的:探讨半叶马尾藻多糖(SHP)拮抗辐射损伤小鼠造血系统的机制。方法:流式细胞术检测小鼠骨髓细胞周期和Westernblotting测定细胞周期相关蛋白质CDK4的表达。结果:[60Co]γ射线(5Gy)导致小鼠骨髓细胞G0/G1期阻滞,而S期和G2/M期细胞百分率下降。SHP(10-40mg/kg)可以减轻小鼠骨髓细胞G0/G1期阻滞,增加S期和G2/M期细胞百分率,表现为SHP加照射组小鼠G0/G1期骨髓细胞百分率明显低于单纯照射组,S期和G2/M期骨髓细胞百分率显著高于单纯照射组。小鼠骨髓细胞CDK4蛋白质表达照射组明显低于正常对照组,SHP加照射组小鼠骨髓细胞CDK4蛋白质表达显著高于单纯照射组。结论:SHP拮抗[60Co]γ射线损伤小鼠骨髓细胞的机制与其调节骨髓细胞周期和增加CDK4蛋白质表达密切相关。     

蘡Ao中分离的多酚化合物

目的分离鉴定蘡Ao地上部分的化学成分。方法通过硅胶柱色谱，Sephadex LH-20及制备HPLC方法分离，对其进行理化常数和光谱分析确定结构。结果自蘡Ao地上部分分离得到11个多酚化合物，均属首次分离。结论化合物1为新化合物，经鉴定其结构为3，5-二甲氧基-4-羟基苯丙醇-9-氧-β-D-吡喃葡萄糖苷。     

浙贝母种子两种低温解除休眠过程中酯酶同工酶的电泳分析

为了探讨浙贝母种子低温解除休眠的生理机制,用电泳手段分析了浙贝母种子在8～10℃和3～5℃两种低温下解除休眠过程中酯酶同工酶的电泳图谱。结果表明两种低温条件下酯酶同工酶的变化规律相似。随着低温处理,一些原有谱带的颜色加深,并有新谱带的出现。这些结果说明两种低温下解除休眠的过程可能存在着相似的代谢机制。     

浙贝母低温解除休眠过程中淀粉酶和还原糖的研究

研究了浙贝母低温解除休眠过程中淀粉酶的活性和还原糖的含量变化。结果表明,芽和鳞片的内在代谢均发生了变化,鳞片近轴面表皮的淀粉酶活性和还原糖含量比鳞片的内部贮备组织高,但和芽的该两项指标接近。     

半叶马尾藻化学成分的研究Ⅰ

 目的：对马尾藻科植物半叶马尾藻［Sargassum hemiphyllum(Turn.) Ag.］藻体的甾醇类成分进行研究。方法：利用真空液相层析、Sephadex LH-20层析和反复硅胶柱层析进行分离，根据甾醇的理化性质和光谱数据鉴定其结构。结果：得到5个甾醇类化合物，分别确定为岩藻甾醇(SPⅠ)、24 氢过氧基 24-乙烯基胆固醇(SPⅡ)，(22E，24S)24-甲基-5α胆甾7，22二烯3β，5，6β三醇(SAⅢ)，saringosterol (SPⅣ)和麦角甾醇过氧化物(ergosterol peroxide) (SAⅥ)。结论：SPⅡ，SAⅢ和SAⅥ为首次从褐藻类中发现。     

(+)-cis-ε-Viniferin的结构确证

用光化学沟通方法确证了从葡萄科植物蘡薁Vitis thunbergii(Vitaceae)中分离得到的( )-cis-ε-viniferin的结构；并纠正了文献核磁共振氢谱(^1H-NMR)数据。     

Biosynthesis of Silver Nanoparticles from Marine Seaweed Sargassum cinereum and their Antibacterial Activity

Seaweed extracts of Sargassum cinereum was used as a reducing agent in the eco-friendly extracellular synthesis of silver nanoparticles from an aqueous solution of silver nitrate (AgNO₃). High conversion of silver ions to silver nanoparticles was achieved with a reaction temperature of 100^° and a seaweed extract concentration of 10% with a residential time of 3 h. Formation of silver nanoparticles was characterised by spectrophotometry and the scanning electron microscope. The average particles size was ranging from 45 to 76 nm. Antimicrobial activities indicate the minimum inhibitory concentration of biologically synthesised nanoparticles tested against the pathogen Staphylococcus aureus with 2.5 μl (25 μg/disc). High inhibitions over the growth of Enterobacter aerogenes, Salmonella typhi and Proteus vulgaris were witnessed against the concentrations of 100 μg/disc. Promising potential and the future prospects of S. cinereum nanoparticles in pharmaceutical research are the highlights in this paper.     

Potential of liquid extracts of Sargassum wightii on growth,biochemical and yield parameters of cluster bean plant

ObjectiveTo explore biofertilizing efficiency of seaweed liquid extracts of brown alga Sargassum wightii (S. wightii) on growth, biochemical and yield parameters of Cyamopsis tetragonoloba (C. tetragonoloba).MethodsSeaweeds were made to coarse powder and stock solution was prepared. Different concentrations such as 0.5%, 1.0%, 1.5%, 2.0%, 2.5% and 5.0% were prepared and given as foliar spray.ResultsSeaweed Liquid Extract (SLE) at low concentration (1.5%) exhibited promoting effect on growth and yield parameters. Differential responses in the content of photosynthetic pigments, protein, reducing sugar, ascorbic acid and in the activity of nitrate reductase were also observed in the leaves of SLE treated seedlings when compared to untreated seedlings. Higher concentrations (above 1.5%) of SLE were found to show inhibitory effect.ConclusionThe presence of micro and macro nutrients, vitamins, growth hormones and other constituents in the seaweed extract might be very much useful to the crops but their level should be appropriate to enhance growth and productivity. It may be concluded that liquid seaweed extracts could serve as cost effective eco-friendly product for sustainable agriculture.