Indian stillingia oil and tallow

The stillingia oil and tallow from the seeds ofSapium sebiferum Roxb., have been studied for their component fatty acids and component glycerides. The fatty acids composition was determined by Twitchell's lead-salt-alcohol method followed by systematic fractionation of the methyl esters under high vacuum. The glyceridic composition of the stillingia oil has been examined by permanganate-oxidation and bromination methods whereas the composition of the glycerides of the stillingia tallow was arrived at by using the low-temperature crystallization technique. The component fatty acids of the stillingia oil have been found to consist of caprylic (1.5%), capric (1.0%), myristic (0.97%), palmitic (2.8%), stearic (1.0%), oleic (9.4%), linoleic (53.4%), and linolenic (30.0%); the latter two are the major constituents. The glycerides of the oil were found to consist of disaturated-mono-linolein (7.9%), mono-saturated-dilinolein (7.9%), mono-oleo-di-linolein (6.1%), monolinoleno-di-linolein (45.7%), mono-linoleo-di-linolenin (10.7%), mono-oleo-di-linolenin (3.3%), and oleo-linoleo-linolenin (18.4%). The fatty acids composition of the stillingia tallow was found to be lauric (0.3%), myristic (4.2%), palmitic (62.3%), stearic (5.9%), and oleic (27.4%). The component glycerides were found to be trisaturated (31.2%), disaturated monounsaturated (64.0%) and monsaturated, diunsaturated (4.8%).Peer reviewed: YesNRC publication: N

Terpenoids-XXV: structure of saussurea lactone

Saussurea lactone is identical with the product of pyrolysis of dihydrocostunolide. On cyclisation in the presence of p-nitrobenzoic acid followed by hydrogenation it gives santanolide C. Hence structure (V) is assigned to saussurea lactone

Structure-function mimicry of oxidized purple acid phosphatase-PAP_ox – A new functional model

1023-1029Electronic structure and spectroscopic properties of the novel diiron active site of oxidized mammalian purple acid phosphatase analogues, Fe-6: [Fe2 ( -O) ( -OAc) (4HNSQox)∸(ONSQox)2∸(H2O)4] and Fe-7: [Fe2 ( -O) ( -OAc)(ONSQox)2∸(OAc) (H2O)4] are described. Magnetic susceptibility SQUID data of Fe-6 are best fitted to Heisenberg’s isotropic spin pair (S = 5/2, 3/2) model using magnetic parameters g = 2 and J = – 36.8 cm-1 with R factor = 6.4 × 10-4. The antiferromagnetic exchange establishes Fe(III)-O-Fe(III) dimeric core with Fe(III) site having two radical ligations in the naphthosemiquinone oxime form of lawsone oxime. In the model compound Fe-7 of oxidized purple acid phosphatase, bridged and terminal acetate functions are identified according to their different energies of activations, i.e, ~34 and 58 kJ mol-1 respectively. Also, the reduced naphthoquinone oxime form of ligand is characterized by its energy of activation (~15 kJ mol-1) from pyrolytic reaction. Mössbauer parameters, = 0.4 mm s-1 and DEQ = 0.8 mm s-1, are characteristics of oxidized Fe(III) in high spin octahedral site. Only Fe-6 shows analogous physiological DNA cleavage activity on pUC19 plasmid and acts as a good model of oxidized purple acid phosphatase enzyme

Synthesis of low coercive BaFe₁₂O₁₉ hexaferrite for microwave applications in low-temperature cofired ceramic

Polycrystalline M-type barium hexaferrite (BaFe₁₂O₁₉) samples have been synthesized by solution combustion route at different pH and calcination conditions in order to reduce the coercivity for microwave applications in low-temperature cofired ceramic (LTCC) substrates. Structural, morphological, and magnetic properties of BaFe₁₂O₁₉ were studied by x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Raman spectroscopy, vibrating sample magnetometry (VSM), and Mössbauer spectroscopy. The formation of a single-phase hexagonal structure was confirmed by XRD. The Raman spectra reveal all characteristic peaks of BaFe₁₂O₁₉, illustrating the phase purity and crystal lattice symmetry of the synthesized material. Mössbauer spectra illustrate the existence of Fe³⁺ cations at all five crystallographic lattice sites. The microstructural features observed by FESEM disclose the growth of nanoregime particles into hexagonal platelet particles after calcination at temperatures from 800°C to 1200°C. The VSM results show a lower coercivity (1350 Oe to 3500 Oe) together with reasonably high saturation magnetization (55 emu/g to 60 emu/g) and a high bulk resistivity (>10⁹ Ω-cm) at room temperature. The dependence of magnetic and electrical properties on the preparation and processing conditions is also discussed