红外光谱分析蜂胶乙基纤维素微球中的溶剂残留

采用液中干燥法制备了蜂胶乙基纤维素微球。分析了主要组成原料的红外光谱图。结果证实,微球制备中出现的收率异常现象是因为溶剂液体石蜡残留所致。在选用的实验条件下,微球中不含乙醚、丙酮和Span-80。     

Modulation of antioxidant,chelating and antimicrobial activity of poplar chemo-type propolis by extraction procures

This investigation was aimed to prepare solid propolis extracts by lyophilisation and to evaluate the efficiency of different extraction procedures (maceration/ultrasound extraction) and different types of extraction media used on extraction of phenolic compounds (TP), flavonoids (TF) and phenolic acids (TPA) from the raw poplar type propolis. Obtained lyophilised extracts were evaluated in terms of extraction yield, antioxidant potential and antimicrobial activity against selected bacterial/fungal stains. Those parameters varied significantly as a function of extraction parameters applied. In this regard, 80% ethanol was found to be the preferred extraction medium, allowing efficient extraction of TP and TF with high extraction yields. The resulting extracts were notable radical scavengers showing high antibacterial efficiency against Streptococcus mutans but were less efficient against Pseudomonas aeruginosa. Also, moderate antifungal activity against Candida albicans was observed. On the contrary, extracts prepared by aqueous extraction showed poor antimicrobial activity against tested stains but were active Fe²⁺ chelators. Ultrasound extraction showed comparable efficiency as maceration in extraction of bioactive compounds from the raw propolis, but offered additional advantages by ensuring the efficient extraction of phenolic compounds from propolis at rather low temperature (4 °C vs. 25/50 °C for maceration) in a short time (30 min vs. 24 h for maceration).     

Formation and characterization of melt-spun polypropylene fibers with propolis for medical applications

The search of possibilities to improve the functional properties of textile materials has been continuing for years with the aim to provide higher hygiene characteristics offer advanced therapeutic functionality. One of available approaches to provide new properties for textiles is the inclusion of natural ingredients. Propolis extracts are successfully used in practical therapeutics for accelerated wound healing and cell proliferation processes. In this study, pure multi-filament yarns and yarns saturated with propolis were developed and characterized. The effect of preparation and formulation parameters on the characteristics of yarns was evaluated; the release of propolis extract components from yarns and their possible cytotoxicity on cell formation was also determined.     

蜂胶提取物的抗氧化活性研究

以菜籽油和猪油为实验油,采用schall烘箱法测定蜂胶及其乙醇提取物、超临界CO2提取物和CO2残渣醇提物的抗氧化活性,并与其他通用抗氧化剂比较。结果表明:总黄酮浓度0.01%以上的蜂胶提取物均能显著延长油脂氧化诱导期,是高效的油脂抗氧化剂;黄酮类化合物仍是各蜂胶提取物中主要含量成分和主要抗氧化活性成分之一,且随总黄酮浓度0.005%以上一定范围与其整体抗氧化活性呈现量效关系;在相同添加量0.02%(蜂胶提取物均以总黄酮计)和恒温60℃条件下,各抗氧化剂抗氧化效果按强弱顺序排列为:菜籽油中,TBHQ>蜂胶超临界CO2提取物>蜂胶CO2残渣醇提物≥蜂胶乙醇提取物>VE>甘氨酸>蜂胶>BHT;猪油中,TBHQ>蜂胶CO2残渣醇提物≥蜂胶乙醇提取物≥BHT>甘氨酸>蜂胶>蜂胶超临界CO2提取物>VE。本试验结果可望为各蜂胶提取物将来被用作含油脂食品的天然抗氧化剂提供一定的实验数据。     

蜂胶醇提物的挥发性成分分析

本研究采用顶空-固相微萃取法(HS-SPME)和气相色谱-质谱(GC-MS)比较分析了中国和马来西亚醇提蜂胶(EEP)的挥发性成分。结果显示,中国醇提蜂胶的挥发性成分中检测到60种物质,其中姜黄烯、雪松烯、苯乙醇、乙酸苯乙酯和柏木烯含量较高;马来西亚醇提蜂胶挥发性成分中检测到29种物质,其中苯甲醛、萘、2-戊基呋喃、2-甲基萘和可巴烯含量较高;中国醇提蜂胶的挥发性成分含量较之马来西亚醇提蜂胶高出约10倍;二者挥发性成分之间的共有物质为乙醇、苯乙烯、柏木烯、苯甲醇和4-乙基-2-甲氧基苯酚,但含量明显不同。     

荆条蜂胶化学成分的研究

本文对荆条蜂胶乙醇提取物的化学成分进行了研究,为进一步的活性评价及建立标准化模型提供基础数据。蜂胶原胶经65%乙醇溶液80℃加热得到蜂胶提取物,将提取物采用石油醚、乙酸乙酯、正丁醇进行逐级溶剂分配、硅胶色谱柱层析、重结晶、制备液相等方法进行分离和纯化,从乙酸乙酯部分分离得到31个化合物,通过对化学物理性质分析以及红外、紫外、质谱、核磁共振波谱的测定解析,确定了化合物结构。其中黄酮类化合物14个,肉桂酸衍生物7个,咖啡酸酯类化合物6个,其它类4个。