A New Pseudo Sesquiterpenoid from the Seeds of Koelreuteria paniculata

From the seeds of medicianl plant koelreuteria paniculata,a new pseudo sesquiter-penoid with novel skeleton namely paniculoid 1 was isolated,The structure of 1 was established on the basis of extensive 2D NMR spectroscopy in conjugation with MS and IR spectral analysis.     

四种油料作物中脂肪酸的测定

建立了拟南芥种子中脂肪酸含量的超声萃取-气相色谱检测方法. 研究探讨了超声时间、加热温度、超声功率、静置萃取时间、萃取剂种类等试验条件对拟南芥种子中脂肪酸含量检测的影响,优化了样品前处理条件及气相色谱检测条件. 结果表明,最优的样品处理条件为：甲酯化超声加热温度90 ℃,超声功率400 W,时间30 min,萃取剂为正己烷,加入萃取剂后4 000 r/min离心5 min. 在最优条件下,脂肪酸分离效果和标准曲线线性关系良好,检出限（LOD）为2.9~21.5 mg/kg,定量限（LOQ）为14.5~94.0 mg/kg,精密度为0.5%~7.9%. 方法所需样品量少,操作简单快速,准确性高,对于部分油料作物如油菜籽、花生、大豆中脂肪酸含量的检测同样适用.     

Influence of seeds on the synthesis of TS-1 with inorganic materials

Summary TS-1 with relatively small crystal sizes (0.4-1.5 μm) was synthesized using inorganic sources of Ti and Si. The effects of conditions in the preparation of seeds on the synthesized zeolites were studied.     

Getting rid of NaBH4: Gold seeds reduced by air-stable agents for synthesizing quasi one-dimensional gold nanoparticles

Herein, we have presented a novel and easy to operate seed-mediated system for fabricating gold bipyramids (AuBPs) with 85% yields without any separation/purification processes. The used gold seeds are reduced by tannin and citrate, two kinds of air stable ligands, and conventionally employed unstable NaBH₄ are thoroughly cast off. In addition, the as-proposed gold seeds can also be employed for AuNRs fabrication with rather larger diameters (22.2–60.3 nm), which is difficult to be achieved by conventional seed mediated fabrication system.     

蓖麻油聚氨酯和乙烯类聚合物互穿网络材料的生成特点及其动态力学性能

研究蓖麻油聚氨酯/取代乙烯共聚物的互穿网络物(IPN)的生成特点指出,其中取代乙烯游离基共聚的氧化还原引发剂组份-过氧化苯甲酰或二甲基苯胺都能加速聚氨酯网络(Pu)的生成。反应温度在 30℃以上蓖麻油也能参与游离基共聚。蓖麻油不仅与TDI反应生成Pu网络,而且也有小部分参与取代乙烯共聚物长枝链的形成。Pu网络的形成较长枝链的生成为快。生成Pu网络时所放出的热促进取代乙烯与少量蓖麻油的双键共聚,最后生成的IPN不溶于甲苯。这表明生成的是接技的半IPN,而不是单纯的半IPN。动态力学研究指出,包含聚苯乙烯或聚甲基丙烯酸甲酯的这种IPN呈现二个T_g,而只包含聚丙烯腈的仅一个T_g,说明后一IPN中相容性较好,有较多的分子混合。随着聚氨酯与聚取代乙烯的比例减少,二个T_g间的差距减少,而较高温度的T_g随取代乙烯共聚物中丙烯腈含量增加而变小。     

Low temperature conversion (LTC) of castor seeds—A study of the oil fraction (pyrolysis oil)

The low temperature conversion (LTC) process applied to a castor seed sample at 380 °C produced pyrolysis oil (50%, w/w), pyrolytic char (29%, w/w), water (13%, w/w) and gas (8%, w/w) fractions. The oil fraction was subjected to analysis of by FTIR, ¹H NMR, ¹³C NMR, GCMS and physical–chemical analysis such as sulfur content, distillation, density, flash-point, kinematic viscosity, Ramsbottom carbon residue, ash content, corrosivity to copper, water content and sediment, cold filter plugging point, and gross calorific value.     

Anlage zur drahtlosen Impuls-Übertragung bei Kernstrahlungsmessungen

Die Anwendung von Radioisotopen unter den Bedingungen der Technik erfordert häufig die Übertragung von Meβsignalen zwischen Meβpunkt und Meßeinrichtungen, wobei mitunter einige hundert Meter überbrückt werden müssen. Da direkte Kabelverbindungen meist nicht möglich sind, wurden am Institut für Arbeitsmaschinen an der Technischen Hochschule in Poznań drahtlose Impulsübertragungen der Meβsignale versucht und unter Praxisbedingungen eingesetzt.

Es werden die Konstruktion, die Arbeitsweise und die Anwendungsmöglichkeiten dieser Signalübertragungen dargestellt.     

Enhancement of ultrasound-assisted extraction of sulforaphane from broccoli seeds via the application of microwave pretreatment

In this study, microwave pretreatment and grinding treatment were used to enhance sulforaphane formation, then ultrasonic-assisted extraction (UAE) was applied to extract sulforaphane using simultaneous hydrolysis and extraction method. The effects of various parameters, which were ultrasonic time, ultrasonic power, solid-water ratio and solid-ethyl acetate ratio on the extraction rate of sulforaphane were investigated. The results showed that microwave pretreatment enhanced sulforaphane formation. Excessive size reduction did not increase or even reduced extraction rate of sulforaphane. Simultaneous hydrolysis and extraction significantly increased extraction rate of sulforaphane compared to hydrolysis followed by extraction. UAE accelerated mass transfer and the solubilization of the targeted compounds due to the acoustic cavitation effect, thus enhanced enzymatic hydrolysis of glucoraphanin and the extraction rate of sulforaphane. The extraction rate of sulforaphane using UAE with simultaneous hydrolysis and extraction was 4.07-fold of the conventional extraction method. UAE was an effective method to extract sulforaphane from broccoli seeds since it led to higher yield of sulforaphane in a much shorter extraction time.     

Distribution of Triterpenoids and Steroids in Developing Rugosa Rose (Rosa rugosa Thunb.) Accessory Fruit

Triterpenoids and steroids are considered to be important for the fruit quality and health-promoting properties for the consumers. The aim of the study was the determination of the changes in triterpenoid and steroid biosynthesis and the accumulation in hypanthium and achenes of rugosa rose (Rosa rugosa Thunb.) hip during fruit development and ripening at three different phenological stages (young fruits, fully developed unripe fruits, and matured fruits). Triterpenoids and steroids were also determined in the peel and the pulp of the matured hips. The obtained results indicated that the distribution of the analyzed compounds in different fruit tissues is a selective process. The increased rate of hydroxylation of triterpenoids, the deposition of hydroxylated acids in fruit surface layer, and the continuous biosynthesis of phytosterols in achenes versus its gradual repression in hypanthium accompanied by the accumulation of their biosynthetic intermediates and ketone derivatives seem to be characteristic metabolic features of maturation of rugosa rose accessory fruit. These observations, apart from providing the important data on metabolic modifications occurring in developing fruits, might have a practical application in defining fruit parts, particularly rich in bioactive constituents, to enable the development of novel functional products.