梗叶配比对加热卷烟专用稠浆法再造烟叶品质的影响

[目的]研究不同梗叶配比对加热卷烟专用稠浆法再造烟叶品质的影响,为稠浆法再造烟叶的开发提供支撑.[方法]分别制备了全叶及梗叶配比为1:9、2:8、3:7、4:6、5:5的稠浆法再造烟叶,测定并对比分析了抗张强度、定量、松厚度、热失重及感官质量.[结果](1)随着烟梗添加比例的增加,稠浆法再造烟叶的定量、抗张强度降低,但...     

Improvement of Luminescence Properties of Blue‐to‐Red Emitting NaCaBO3: Ce3+, Mn2+ Phosphor Prepared by Sol–Gel Method

Color‐tunable phosphors NaCaBO₃: Ce³⁺, Mn²⁺ were synthesized by sol–gel (SG) and solid state (SS) method. SEM observation indicated that the microstructure of phosphor (SG) consisted of regular fine grains with an average size of about 5 μm. NaCaBO₃: Ce³⁺, Mn²⁺ showed two emission bands: one at 425 nm for Ce³⁺ and another at 610 nm for Mn²⁺. NaCaBO₃: Ce³⁺, Mn²⁺ (SG) exhibit higher energy‐transfer efficiency (90%) and higher Mn²⁺ quantum efficiency (80%) than SS samples, due to smooth surface, narrow size distribution, and improved homogeneity of sensitizer/activator ions. NaCaBO₃: Ce³⁺, Mn²⁺ exhibits blue‐to‐red tunable color by changing Ce³⁺/Mn²⁺ ratio.     

Study on the performance of NaBH4 using Ru-Co/CNTs catalyst to catalyze alcoholysis to produce hydrogen

Abstract

Ru-Co/CNTs catalysts are prepared by microwave-assisted heating electroless plating using Carbon nanotubes as Carrier. The structure of the catalyst was analyzed by TEM, XRD, EDS and TGA, and the performance of the catalytic alcoholysis of sodium borohydride was tested. At 25 oC, the carbon nanotube diameter is 10-20?nm, the catalyst dosage is 20?mg, the sodium borohydride concentration is 5?wt.%, and the sodium hydroxide concentration is 7?wt.%, the maximum rate of catalytic hydrogen production reaches the maximum value. At the same time, the activation energy is calculated to be 34.35?kJ · mol-1, which is much lower than the activation energy of spontaneous alcoholysis of sodium borohydride (63.0?kJ/mol).     

Chemical constituents and antioxidant activity of the Musa basjoo flower

In this study, it was found that the ethyl acetate soluble fraction of Musa basjoo flowers was a rich source of antioxidant, due to its high total phenolic contents and significant antioxidant activity. Ten phenolic compounds were isolated from this plant. They are gallic acid (1), caffeic acid methyl ester (2), guaiacylglycerol (3), 3-(3,4-dihydroxyphenyl)-acrylic acid 1-(3,4-dihydroxyphenyl)-2-methoxy carbonyl ethyl ester (4), thero-guaiacylglycerol 8-O-β-d-glycopyranoside (5), quercitrin (6), buein (7), (2R, 3S)-5,7,3′,4′,5′-pentahydroxyflavanonol (8), isoquercitrin (9) and 1,7-bis(3,4-dihydroxyphenyl)-hepta-4E, 6E-dien-3-one (10). In addition, compounds 1, 2, 4, 6, 7, 8, 9 and 10 possessed potent strong free radical scavenging activity. Compounds 1 and 10 with powerful activity showed the higher content, implying important roles of 1 and 10 for the antioxidant activity of Musa basjoo flower. The study suggested that components of Musa basjoo flower possessed good antioxidant capacities and the species could be used in the prevention of diseases related to oxidant by-products of human metabolism.     

Biophenolic profile in olives by nuclear magnetic resonance

The molecular composition of biophenols in olive fruit was investigated in order to experiment with novel procedures for the determination of these microcomponents in fresh and processed table olives. The presence of biophenols in table olives, with recognized antioxidant activity, can be strictly linked to the texture and the organoleptic characteristics of the food product, giving a functional value to this Mediterranean food. Olives from Spain (“Hojiblanca” cv.), Portugal (“Douro” cv.), Greece (“Conservolia” and “Thasos”cv.) and Italy (“Taggiasca” and “Cassanese” cv.) were examined, because the experimental data, checked by high-performance liquid chromatography (HPLC), show molecular composition differences in the tested samples related to the geographic area of analyzed olive fruit cultivars [Bianco, A., & Uccella, N. (2000). Biophenolic components of olives. Food Research International, 33, 475–485]. Three different protocols were utilized: the first one allows the determination of the biophenolic content present as free and esterified compounds; the second affords the total biophenolic content; the third indicates the biophenols present as glycosides. The biophenolic content, which was previously determined by classic HPLC methods (Bianco & Uccella, 2000), was checked by a simple ¹H-NMR experiment. The comparison between the data obtained from ¹H-NMR with those measured by HPLC, indicates a good agreement and suggests the possibility of employing ¹H-NMR for the rapid determination of biophenolic content in olives and also in other foods.     

Synthesis and photoluminescence properties of Sr3(PO4)2:Re3+, Li+ (Re = Eu,Sm) red phosphors for white light-emitting diodes

Sr₃(PO₄)₂:Re³⁺, Li⁺ (Re = Eu, Sm) red phosphors were prepared via a high temperature solid state reaction, and their structure and luminescence properties were investigated. X-ray diffraction patterns indicate that the phase of as-prepared samples is in good agreement with standard Sr₃(PO₄)₂ structure. Under 395 nm excitation, the emission of Sr₃(PO₄)₂:Eu³⁺ consists of a strong peak centered at 622 nm and two weak peaks centered at 598 nm and 660 nm, which correspond to ⁵D₀→⁷F₂, ⁵D₀→⁷F₁ and ⁵D₀→⁷F₃ transitions, respectively. Also, the emission spectrum of Sr₃(PO₄)₂:Sm³⁺ shows three main peaks at 568 nm, 603 nm and 651 nm, which are attributed to ⁴G_5/2→⁶H_I/2 (I = 5, 7, 9) transitions of Sm³⁺. Furthermore, luminescence properties of Sr₃(PO₄)₂:Re³⁺, Li⁺ (Re = Eu, Sm) samples are enhanced significantly by Li⁺ ions doping as charge compensator. Results indicate that as-prepared Sr₃(PO₄)₂:Re³⁺, Li⁺ (Re = Eu, Sm) could be the potential red phosphors used in white light-emitting diodes.     

基于自组织建模方法的卷烟购买因素分析

为研究不同卷烟规格消费人群的购买动机,针对2015年在销的3个价档、4个卷烟规格的品牌形象、价值（价格）、社交应酬、健康、新品、产品和渠道/宣传促销七大类因素进行问卷调研,并采用自组织GMDH算法进行购买因素分析,结果表明:不同卷烟规格最重要的购买因素主要分布在品牌形象和价值（价格）两个大类中,其中3个价档卷烟的购买因素侧重点分别体现在产品价值、品牌知名度和身份地位的象征性上,而4个产品的购买因素侧重点分别体现在产品价值、品牌历史形象、社交应酬优势和产品性价比上。该结果可为工业企业新产品市场投放和老产品提质维护方面提供参考。      

薄荷油微胶囊的制备及其性能研究

目的研究薄荷油微胶囊的制备方法,并研究包合物的制备及其结构表征,开发新型微胶囊载香技术。方法通过紫外分光光度法对短葡聚糖链(octenyl succinic anhydride short chain dextran chain, OSA-SGC)包埋薄荷油的包埋率进行测定,通过扫描电子显微镜(scanning electron microscope,SEM),热重分析(thermogravimetric analysis,TGA),红外光谱分析(infrared spectroscopy,IR)及X射线衍射(X-ray diffraction,XRD)对OSA-SGC及其包合物进行表征。结果由酶解蜡质玉米淀粉制备的OSA-SGC聚合物的包埋率为35.7%。结论酶解蜡质玉米淀粉制备的OSA-SGC聚合物能够有效包埋薄荷油,为新型微胶囊载香技术的开发与应用找到新出路。     

Studies on the lipid and protein composition of guava seeds (Psidium guajava)

Chloroform-methanol extracted lipids of guava seeds amounted to 9·1% on a dry weight basis. Physical and chemical properties of the extracted oil are presented. Gas-liquid chromatographic analysis of the methyl esters of the fatty acids of the oil revealed the presence of twelve fatty acids. The fatty acid pattern obtained was generally similar to that of cottonseed oil. The unsaponifiable matter was also analysed by GLC which showed the presence of eight fractions.The protein content of guava seeds was 9·73% on a dry weight basis. Qualitative and quantitative analyses revealed the presence of fifteen amino acids.     

灰毛莸挥发油化学成分的研究

采用GC/MS联用法研究了通过同时蒸馏萃取法(SDE)提取灰毛莸挥发油的化学成分,同时结合WILEY、NIST谱图库检索出其主要化学成分。结果表明,在所给的分析条件下,共分离并鉴定出70个化学成分。主要成分为:反-(-)-2(10)-蒎烯-3-醇乙酸酯、(+)-柠檬烯、L-香芹醇、异香芹醇、左旋-β-蒎烯、β-蒎烯、桃金娘烯醇、L-香芹酮等,占挥发油总质量的80.88%,其结果为该植物挥发油的生理活性研究和产品的开发应用提供了重要的理论依据。