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常温条件下薰衣草精气成分研究
薰衣草 精气 化学成分
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2012/8/6
研究常温条件下薰衣草精气的化学成分及含量。用抽滤瓶和大气采样器采集薰衣草精气,通过气相色谱-质谱(GC-MS)对其进行分析鉴定,峰面积归一法测定各成分GC含量。常温条件下共鉴定出13种化合物,其主要成分为对异丙基甲苯(23.17%)、柠檬烯(20.76%)和1-甲基-4-(1-甲基乙烯基)苯(17.58%)。与前人所鉴定出的薰衣草精油成分比较表明,薰衣草精气和精油的化学组成是不同的。
大豆分离蛋白热塑材料的制备及其表征
大豆分离蛋白 热塑性 接枝共聚
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2012/8/4
以大豆分离蛋白(SPI)为原料,过硫酸铵为引发剂,亚硫酸钠为变性剂,在尿素溶液中用接枝共聚的方法,与丙烯酸甲酯(MA)和甲基丙烯酸甲酯(MMA)混合单体反应,合成了热塑性SPI材料(T-SPI)。研究了不同反应条件对接枝反应的影响,在250mL水中,16g SPI与单体接枝的最佳反应条件为:尿素浓度2mol/L,引发剂用量35mmol/L,单体浓度1.23mol/L,反应温度70℃,反应时间4h。...
采用气相色谱质谱分析、氨基酸分析、电感耦合等离子体质谱分析方法,研究了云南野生食用黑虎掌菌独特的风味成分。研究结果首次发现,室温下黑虎掌菌中含挥发性芳香物质42种,主要为脂肪烃醇类、烯烃类和芳香性杂环类,非挥发性的滋味活性物质氨基酸17种,矿物质微量元素10种以及稀土元素9种。表明了黑虎掌菌具有较高的营养价值和药用价值。
松香基功能高分子金属离子配合物固定化淀粉酶
松香基功能高分子 固定化酶 淀粉酶 活性
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2012/8/5
分别以聚马来松香己二醇酯、马来松香乙二醇丙烯酯聚合物和马来松香乙二醇丙烯酯-丙烯酸共聚物为载体,金属离子为桥键配位离子固定化淀粉酶。测定了固定化淀粉酶的性能,探讨了固定化酶反应机理。结果表明金属离子作为桥键配离子的固定化淀粉酶中,PMGAECa(Ⅱ)En和poly(MGAE-AA)Ca(Ⅱ)En效果较好,重复使用5次后,每5min的活性分别为11.33、9.44mg/g,相对保留活性为32.78%...
开发了一种新的生物质热解油精制方法。通过将生物质热解油加水预分离,得到水溶性组分和非水溶性组分分别加以利用。水溶性组分通过反应精馏的方法得到混合酯类化合物,收率21%(以生物原油计算)。非水溶性组分可以有两种方式进行加工利用:1)替代苯酚合成热塑性酚醛树脂,通过DSC性能分析,所合成的树脂满足常规树脂的应用要求;2)通过相转移催化法合成高品位液体燃料油,通过GC-MS分析,非水溶性组分中的羧基和酚...
以95%(体积分数,下同)的乙醇为溶剂,利用均匀设计法优化了超声波辅助提取白桦树皮中桦木醇的工艺,考察了各因素对桦木醇提取率的影响,并以高效液相色谱法测定了萃取物中桦木醇的含量。结果表明,在超声波功率400W、提取时间70min、提取温度70℃、液固比40:1(mL:g)的条件下,超声波辅助提取桦木醇提取率可达到83.43%±1.89%,纯度71.20%±0.74%。与传统回流提取法相比,超声波辅...
烤烟烟叶与造纸法再造烟叶热裂解产物的对比分析
热裂解 烤烟烟叶 造纸法再造烟叶 气相色谱-质谱
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2012/8/6
为了更好的评价天然烤烟烟叶与造纸法再造烟叶在卷烟中的作用,对比研究了烤烟烟叶和造纸法再造烟叶的化学组成以及它们在不同温度下的热裂解产物。利用改进后的热裂解装置模拟了卷烟的燃烧行为,研究了烤烟烟叶和造纸法再造烟叶在大气环境中于300、600和 900℃ 下的热裂解行为,并采用气相色谱-质谱联用仪对热裂解产物进行分析。结果表明,烤烟烟叶和造纸法再造烟叶的热裂解产物种类随着热裂解温度的增加而增多;在相同...
杨树芽提取物体外抗肿瘤活性的研究
杨树芽提取物 四甲基偶氮唑盐比色法 抗肿瘤活性
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2012/8/6
采用四甲基偶氮唑盐比色(MTT)法观察杨树芽提取物对MCF-7、SMMC-7721和A5493种肿瘤细胞的体外生长抑制作用,并与市售蜂胶和杨树胶的抗肿瘤活性进行对比。结果表明:杨树芽提取物对3种肿瘤细胞作用 48 h 的抑制率分别为 97.1%、88.7% 和 60.5%,半数抑制质量浓度(IC50)分别为58.4、83.9和 196.3 mg/L,均高于蜂胶和杨树胶。杨树芽提取物对体外培养的肿瘤...
Bibliography of articles, rewievs, technical information and reports published in the “Drvna Industrija” journal in volume 59 (2008), UDC and ODC
articles rewievs technical information reports published Drvna Industrija
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2009/7/21
Bibliography of articles, rewievs, technical information and reports published in the “Drvna Industrija” journal in volume 59 (2008), UDC and ODC.
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Correction factor for real-time determination of wood dust mass concentration by photometric method
photometry gravimetric method exposure to wood dust inhalable particles
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2009/7/21
Samples of wood dust were collected in the working environment of wood machining processes for the purpose of determining correction factors for measuring mass concentration of wood dust by photomet...
Finite volume method for analysis of stress and strain in wood
finite volume method chair wood drying steaming
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2009/7/21
This paper presents a numerical method (the finite volume method) for analysing stress and strain in wood as a solid body. The method is very simple and easy to use. It starts from an integral form ...
Dimensional stability of wood modified by citric acid using different catalysts
dimensional stability of wood beech wood fir wood chemical modification citric acid NaH2PO2 NaH2PO4
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2009/7/21
Small wooden samples of fir (Abies alba Mill.) and beech (Fagus sylvatica L.) were chemically modified by citric acid (CA) as non-formaldehyde cross-linking system reagent and cured by convection he...
Antropotechnical aspects of furniture design
furniture dimensions ergonomy anthropometry mechanical properties
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2009/7/21
A person having direct contact with a piece of furniture becomes part of an arrangement known as anthropotechnical system made up of an animate part (human body) and an inanimate part (technical fac...
Determination of relationships between density, amount of glue and mechanical properties of OSB
oriented strand board (OSB) density bending strength modulus of elasticity tensile strength perpendicular to the board surface amount of glue PMDI glues
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2009/7/21
This paper deals with problems of the effect of changes in density and amount of glue on mechanical properties of OSB (oriented strand boards). Tests of mechanical properties were carried out on OSB...