Clausenolide-1-methyl ether from Clausena heptaphylla W&A [Clausenolido-1-metil éter de Clausena heptaphylla W & A]

El limonoíde clausenolido-1-metil eter (1) fue aislado de corteza de Clausena heptaphylla. La estructura del compuesto fue determinada por metodos espectroscópicos, incluyendo 2D RMN, espectrometría de masas (EM) y comparación de los datos espectroscópicos y constantes físicas con los publicados en la literatura. Este es el primer informe del aislamiento de clausenolido-1-metil eter (1) de Clausena heptaphylla.Abstract From the stem bark of Clausena heptaphylla, the limonoid  clausenolide-1-methyl ether (1) was isolated. The structure of the compound was elucidated by extensive spectroscopic studies, including 2D NMR and MS measurements and by comparison with spectroscopic and physical data from the literature. This is the first report of occurrence of clausenolide-1-methyl ether (1) in Clausena heptaphyll

Adapting the principle of neutral sulphite cooking for modification of textile quality of jute fibre

298-302A study is reported on the modification of textile properties of jute fibre by treatment with neutral sodium sulphite liquor at varying temperature under pressure. The lignin of the fibre undergoes a sulphonation reaction and is partially dissolved out from the fibre along with some hemicelluloses depending on the degree of sulphonation. The residual lignin sulphonates probably form insoluble condensation products in the fibre. The treatment brings some changes in the physicochemical properties of the fibre. The modified jute fibre may be utilized in fine yarn spinning for diversified textile uses

Activated carbon from krishnachura fruit (<i>Delonix regia</i>) and castor seed (<i>Ricinus communis L.</i>)

146-151Activated carbons were prepared from the husk of krishnachura (Delonix regia) fruit and the hull of castor (Ricinus communis L. ) seed using zinc chloride and steam-N2 as activating agent. The activating agent steam-N2 was used only for krishnachura whi le ZnCl2 was used both for activating krishnachura and castor samples. It was found that the adsorptive capacity of carbons produced by using ZnCl2 and steam-N2 as activating agent is comparable with that of commercially available samples. The adsorptive capacity was measured by permanganate method and the carbons produced were employed for the decolorization of molasses solution.</span

Effect of Reinforcement of Hydrophobic Grade Banana ( Musa ornata

This research studied the physicomechanical as well as morphological properties of alkali treated (NaOH and KMnO4) and untreated banana bark fiber (BBF) reinforced polypropylene composites. A detailed structural and morphological characterization was performed using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and mechanical properties testing (tensile strength, flexural strength, and microhardness). Chemical treatments improved the hydrophobic property of the fiber and it is found to be better for KMnO4 treatment. Composites with 0, 5, 10, and 15 wt.% loadings were then compared for water uptake studies and revealed that KMnO4 treated fiber composites absorb less water compared to others. KMnO4 treatment with 15% fiber loading improved the tensile strength, flexural strength, and microhardness of the composites compared to raw and NaOH treated fiber loadings. TGA analysis also shows onset temperature at 400~500°C that is associated with the decomposition of the banana fibers constituents including lignin, cellulose, and hemicelluloses which suggests better thermomechanical stability. All of the values suggest that 15% KMnO4 treated banana bark fiber (BBF)/PP composites were found to be better than those of the raw and NaOH treated ones

A new 7-oxygenated coumarin from Clausena suffruticosa

A new coumarin, 7-[(2′E,6′E)-7′-carboxy-5′(ζ)- hydroxy-3′-methylocta-2′,6′-dienyloxy]-coumarin, was isolated from the leaf of Clausena suffruticosa. Its structure was established by means of spectroscopic data analyses, including mass spectrometry and both 1D and 2D NMR spectroscopy

Study of Naturally Woven Coconut Leaf Sheath-Reinforced Polypropylene Matrix Based Composites

Renewable materials have gained significant attraction as reinforcement in polymer matrix composites. Naturally woven coconut leaf sheath (CLS) fiber-reinforced polypropylene (PP) composites were prepared by compression molding. Different composites were fabricated varying the weight percentage of CLS fiber (5, 10, 15, 20 and 25 wt%) . Hydrophilic nature of the CLS fiber was evaluated using water uptake test. Structural feature of the composites was confirmed by infrared spectroscopy. Mechanical performance was investigated using tensile and bending tests. Fiber reinforcement significantly increased the mechanical properties of the composites. Moreover, thermal properties and degradation nature of the composites were investigated

Physical and Thermal Characterization of Alkali Treated Rice Husk Reinforced Polypropylene Composites

Rice husk (RH) reinforced polypropylene- (PP-) based composites were prepared by compression molding. The RH was treated with sodium hydroxide solution (1 wt%); then composites were prepared using varying percentages of RH (5 to 20 wt%). The thermomechanical, spectroscopic, and morphological properties of the prepared composites (RH-PP) were investigated. The scanning electron microscopic (SEM) analysis showed better interfacial adhesion between alkali treated RH and the matrix PP. The Fourier Transform Infrared (FTIR) spectra confirmed the chemical bonding.The results revealed that physical properties as well as thermal stability of the composites improved significantly with the addition of alkali treated RH in PP matrix

Physico-mechanical properties of fabrics prepared from blends of sulphonated jute fibre with natural and synthetic fibres

414-417<span style="font-size: 14.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">The plain woven fabrics have been prepared from the blends of sulphonated jute fibre with natural and synthetic fibres, and their geometrical, physico-mechanical and drapping properties studied. It is observed that the blended fibre fabrics show improved textile properties, almost similar to those of the cotton fabrics. </span