Anasterocerebroside A, a New Glucosylceramide from the Patagonian Starfish Anasterias minuta

2003 ◽  
Vol 58 (5-6) ◽  
pp. 433-440 ◽  
Author(s):  
Hugo D. Chludil ◽  
Alicia M. Seldes ◽  
Marta S. Maier
Keyword(s):  
Methylene Chloride ◽  
Lipid Fraction ◽  
Water Extract ◽  
Pure Compound ◽  
Chemical Methods ◽  
First Time

Abstract Eight glucosylceramides (1-8) were isolated from the water-insoluble lipid fraction of a methylene chloride/methanol/water extract of the Patagonian starfish Anasterias minuta. One of the constituents was identified as a new glucosylceramide, anasterocerebroside A (1), while the known glucosylceramide 7 was isolated and characterized for the first time as a pure compound. The structures of 1 and 7 were established by spectroscopic and chemical methods.

scholarly journals A study on Antioxidant Properties of Different Extracts from Kitaibelia balansae

Proceedings ◽  
2019 ◽  
Vol 40 (1) ◽  
pp. 23
Author(s):  
Zengin ◽  
Aygun ◽  
Aktumsek
Keyword(s):  
Ethyl Acetate ◽  
Human Body ◽  
Antioxidant Properties ◽  
Water Extract ◽  
Antioxidant Ability ◽  
Chemical Methods ◽  
Potential Source ◽  
First Time ◽  
Antioxidant Effects ◽  
Ethyl Acetate Extracts

Nowadays, knowledge of ancient botanical medicinal practices and application of modern phytochemical techniques have provided the excellent tools for the purification and structural elucidation of various phyto-compounds, which, in turn, has given insights into their mode of action on the human body. This study has been designed to investigate for the first time the antioxidant effects of the ethyl acetate, methanolic, and water extracts of Kitaibelia balansae. Different chemical methods were performed and the observed abilities depend on the solvent used. The best antioxidant ability was noted in water extract, followed by methanol and ethyl acetate extracts. The highest level of phenolic was also detected in water extract. The present findings suggest that K. balansae can be considered as a potential source of bioactive compounds for novel phytopharmaceuticals development

scholarly journals Identification of pigments in artworks by inverse tangent derivative of spectrum and a new filtering method

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
F. Fazlali ◽  
S. Gorji Kandi
Keyword(s):  
Reflectance Spectrum ◽  
Practical Method ◽  
Chemical Methods ◽  
Munk Function ◽  
Absorption Of Light ◽  
Spectrophotometric Data ◽  
First Time ◽  
Non Destructive ◽  
Derivatives Of

Abstract Employing an economical and non-destructive method for identifying pigments utilized in artworks is a significant aspect for preserving their antiquity value. One of the non-destructive methods for this purpose is spectrophotometry, which is based on the selected absorption of light. Mathematical descriptive methods such as derivatives of the reflectance spectrum, the Kubelka–Munk function and logarithm have been employed for the characterization of the peak features corresponding to the spectrophotometric data. In the present study, the mentioned mathematical descriptive methods were investigated with the aim to characterize the constituents of an Iranian artwork but were not efficient for the samples. Therefore, inverse tangent derivative equation was developed on spectral data for the first time, providing considerable details in the profile of reflectance curves. In the next part, to have a simpler and more practical method it was suggested to use filters made up of pure pigments. By using these filters and placing them on the samples, imaging was done. Then, images of samples with and without filter were evaluated and pure pigments were distinguished. The mentioned methods were also used to identify pigments in a modern Iranian painting specimen. The results confirmed these methods with reliable answers indicating that physical methods (alongside chemical methods) can also be effective in determining the types of pigments.

scholarly journals Investigation of the oil and Meal of Japanese Quince (Chaenomeles Japonica) Seeds

2013 ◽  
Vol 67 (4-5) ◽  
pp. 405-410 ◽  
Author(s):  
Inese Mierina ◽  
Rasma Seržaneļ ◽  
Maija Strele ◽  
Jūlija Moskaļuka ◽  
Elga Ivdre ◽  
...  
Keyword(s):  
High Performance ◽  
Seed Oil ◽  
Water Extract ◽  
Syringic Acid ◽  
Barley Grain ◽  
Butylated Hydroxytoluene ◽  
Synthetic Antioxidant ◽  
Japanese Quince ◽  
Comparable Activity ◽  
First Time

Abstract Various extracts of Japanese quince (Chaenomeles japonica) seeds obtained using organic solvents were studied for their polyphenol content and antiradical activity. It was established that petroleum ether, hexane, ethyl acetate, acetone, as well as toluene and chloroform extracts, in comparison to synthetic antioxidant butylated hydroxytoluene (BHT), demonstrate better (or comparable) activity against 2,2-diphenyl-1-picrylhydrazyl (DPPH). Methods for detoxification of seeds, meals and press-cakes are proposed. Phenolic composition of different extracts (80% ethanol, 70% acetone), both acid and alkali hydrolysates of seeds, as well as seed oil methanol/water extract were analysed by means of high performance liquid chromatography (HPLC): chlorogenic acid was found for the first time in seed extract; protocatechuic acid predominated in all extracts. The content of other major phenolic acids was detected; it was found that seed oil contains syringic acid. It was determined that Japanese quince seeds contain almost ten times more α -tocopherol than barley grain. Due to the presence of α -tocopherol and phenolic compounds, seed oil and lipophilic extracts of seeds could serve as antioxidants.

scholarly journals EFFICIENCY OF SOME PLANT EXTRACTS TO CONTROL OF PENICILLIUM ITALICUM WEHMER CAUSING BLUE MOLD ON LEMON FRUITS IN IRAQ

2019 ◽  
Vol 31 (1) ◽  
pp. 01-05
Author(s):  
Ahed A.H. Matloob ◽  
Hamid A A. Khafaji
Keyword(s):  
Plant Extracts ◽  
Water Extract ◽  
Inhibitory Effect ◽  
Penicillium Italicum ◽  
Blue Mold ◽  
Lemon Fruit ◽  
Water Extracts ◽  
Wild Mustard ◽  
First Time ◽  
High Inhibitory Effect

The study aimed to evaluate the efficacy of the water extract of Propolis, Wild mustard and dates vinegar in the inhibition of Penicillium italicum causal agent of Blue mold on a lemon fruits. The results showed that all tested extracts with concentrations 5, 10 and 15% had a high inhibitory effect against P. italicum. Dates vinegar is highly effective and showed 100% inhibition of P. italicum and protected lemon fruit from infection. First time this type of natural inhibitory water extracts are used in Iraq which resulted that the dates vinegar is the best suitable option for the management of lemon blue mold disease in post-harvest.

Small Molecule Constituents of Periplaneta americana and Their IL-6 Inhibitory Activities

2021 ◽  
Vol 16 (9) ◽  
pp. 1934578X2110331
Author(s):  
Hua-Sheng Zhang ◽  
Yong-Ming Yan ◽  
Dai-Wei Wang ◽  
Qing Lv ◽  
Yong-Xian Cheng ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Periplaneta Americana ◽  
Ethanol Extract ◽  
Biological Evaluation ◽  
Dependent Manner ◽  
Chemical Methods ◽  
Concentration Dependent Manner ◽  
Inhibitory Activities ◽  
First Time

Two new glycosides, periplanosides A (1) and B (2), 3 compounds reported from a natural source for the first time (3 − 5), and 6 known compounds 6 − 11 were isolated from the ethanol extract of Periplaneta americana (Linnaeus). Their structures, including absolute configurations, were unambiguously identified by comprehensive spectroscopic and chemical methods. Compound 3 is a racemate whose enantiomers were purified by chiral high-performance liquid chromatography . The biological evaluation results showed that compound 7 (0 − 20 μM) did not affect the viability of RAW264.7 cells and could effectively inhibit the production of interleukin-6 stimulated by lipopolysaccharide in a concentration-dependent manner, indicating the potential to develop novel agents against inflammation-related diseases.

Determination of Vitamins A and E in Infant Formula and Adult/Pediatric Nutritional Formula by HPLC with UV and Fluorescence Detection: First Action 2012.09

2013 ◽  
Vol 96 (6) ◽  
pp. 1407-1413 ◽  
Author(s):  
Linda Butler Thompson ◽  
Karen Schimpf ◽  
Steve Baugh
Keyword(s):  
Vitamin E ◽  
Vitamin A ◽  
Infant Formula ◽  
Methylene Chloride ◽  
Lipid Fraction ◽  
Intermediate Precision ◽  
Silica Column ◽  
Vitamin E Acetate ◽  
Uv And Fluorescence Detection

Abstract The method presented is for quantification of α-tocopherol (vitamin E), vitamin E acetate, vitamin A acetate, and vitamin A palmitate in infant formula and adult/pediatric nutritionals. The entire lipid fraction, including vitamins A and E, is extracted from product with iso-octane after products are mixed with methanol, which precipitates proteins and disrupts micelles freeing lipids for extraction. Vitamin A palmitate, vitamin A acetate, and vitamin E acetate are separated from α-tocopherol on a 3 cm silica column with a 1% methylene chloride, 0.06% isopropanol in iso-octane mobile phase; eluted onto a 20 cm silica column; and, after a column switch, further separated on the 20 cm column before UV detection at 325 nm (vitamin A palmitate and vitamin A acetate) and 285 nm (vitamin E acetate). α-Tocopherol is further separated from other extraneous compounds on the 3 cm silica column and detected by fluorescence at excitation and emission wavelengths of 295 and 330 nm, respectively. Quantification limits in ready-to-feed products were estimated to be 80 IU/L for vitamin A palmitate, 207 International Units (IU)/L for vitamin A acetate, 2.4 mg/L for vitamin E acetate, and <0.15 mg/L for α-tocopherol. Over-spike recoveries and intermediate precision averaged 100.4 and 2.09% RSD for vitamin A palmitate, 100.4 and 1.52% RSD for vitamin E acetate, and 99.6 and 3.02% RSD for α-tocopherol. Vitamin A acetate spike recovery data averaged 96.6%, and the intermediate precision for the only product fortified with vitamin A acetate was 2.75% RSD.

IR Spectroscopic Study of M(Benzoic Acid)2Ni(CN)4·(1,4-Dioxane) Clathrate (M = Ni, Cd and Co)

2005 ◽  
Vol 60 (6) ◽  
pp. 469-472
Author(s):  
Zeki Kartal
Keyword(s):  
Benzoic Acid ◽  
Spectroscopic Study ◽  
Chemical Methods ◽  
33.20 Ea ◽  
Ir Spectroscopic ◽  
First Time

In this study, clathrate of benzoic acid-tetracyanonickel, given by the formula M(benzoic acid)2Ni(CN)4・(1,4-dioxane) (M = Ni, Cd and Co), is obtained for the first time through chemical methods. The similarities of the observed spectra indicate that the obtained clathrate of benzoic acidtetracyanonickel is a new example of Hofmann-type clathrates. - PACS numbers: 33.20.Ea, 33.20.Tp

scholarly journals STUDY ON CHEMICAL CONSTITUENTS AND CYTOTOXICITY OF ASPIDISTRA LETREAE

2020 ◽  
Vol 129 (1B) ◽  
Author(s):  
Duc Viet Ho
Keyword(s):  
Methanol Extract ◽  
Human Cancer ◽  
Chemical Constituents ◽  
Hep G2 ◽  
Pure Compound ◽  
Human Cancer Cell Lines ◽  
Phytochemical Investigation ◽  
Reported Data ◽  
First Time

A phytochemical investigation of whole <em>Aspidistra letreae</em> plants led to the isolation of 2<em>H</em>-chromen-2-one (<strong>1</strong>), <em>α</em>-tocopherol (<strong>2</strong>), (<em>E</em>)-phytol (<strong>3</strong>), asparenydiol (<strong>4</strong>) and (25<em>S</em>)-spirost-1<em>β</em>,3<em>α</em>,5<em>β</em>-triol (<strong>5</strong>). Their structures were determined on the basis of NMR spectral evidences and in comparison with the reported data. Of these, asparenydiol (<strong>4</strong>) was isolated from the genus <em>Aspidistra</em> for the first time. This is also the first report on the separation and structural determination of (25<em>S</em>)-spirost-1<em>β</em>,3<em>α</em>,5<em>β</em>-triol (<strong>5</strong>) as a pure compound. The methanol extract exhibited a moderate cytotoxicity against the LU-1, HeLa, MDA-MB-231, Hep-G2, and MKN-7 human cancer cell lines with <em>IC</em><sub>50</sub> values ranging from 52.58 ± 3.65 to 64.78 ± 4.89 μg/mL.

scholarly journals Darstellung und Eigenschaften von cyclo-Nonaschwefeloxid (S9O) und von cyclo-Dekaschwefeloxid (S10O) [1] / Preparation and Properties of cyclo-Nonasulfuroxide (S9O) and of cyclo-Decasulfuroxide (S10O) [1]

1985 ◽  
Vol 40 (5) ◽  
pp. 594-600 ◽  
Author(s):  
Ralf Steudel ◽  
Torsten Sandow ◽  
Jürgen Steidel
Keyword(s):  
Acetic Acid ◽  
Raman Spectrum ◽  
Oxygen Atom ◽  
Raman Spectra ◽  
Carbon Disulfide ◽  
Methylene Chloride ◽  
Molar Ratio ◽  
Infrared And Raman Spectra ◽  
Cyclic Molecules ◽  
First Time

Abstract The homocyclic oxides S9O (m.p. 33 °C, dec.) and S10O (m.p. 51 °C, dec.) have been prepared by oxidation of the corresponding sulfur rings S9 and S10 , respectively, by trifluoroperoxy acetic acid (molar ratio 1:2-3) in a carbon disulfide/methylene chloride mixture. According to infrared and Raman spectra, both compounds contain an exocyclic oxygen atom. S9O and S10O decompose at 25 °C to give SO2 and a polysulfuroxide SnO with >10 but both can be stored at -78 °C without decomposition. The SS bond distances are discussed on the basis of the Raman spectra. In addition, the Raman spectrum of solid S9 has been recorded for the first time. It shows that S9 crystallizes as two allotropes (α-and β-S9) both consisting of cyclic molecules of either C1 or C2 symmetry with bond distances of between 203 and 209 pm.

SiCN films: preparation, properties and practical application (review)

2020 ◽  
Vol 55 ◽  
pp. 83-108
Author(s):  
A.V. Sukach ◽  
Keyword(s):  
Energy Gap ◽  
Chemical Deposition ◽  
Practical Application ◽  
Electrical Measurements ◽  
Plasma Chemical ◽  
Chemical Methods ◽  
Low Thermal Expansion ◽  
First Time ◽  
Main Influence ◽  
Variable Energy

Si-CN films exhibit high mechanical and optoelectronic properties such as photoconductivity, photoluminescence, variable energy gap in the range of 1.37-5.2 eV, high mechanical and thermal strength, low thermal expansion, which allows them to be used in semiconductor devices. and in microelectronic mechanical systems. They are obtained by chemical deposition methods, and to activate the reaction using thermal heating, plasma or ultraviolet radiation, and by physical methods of deposition at relatively low temperatures by magnetron sputtering. The structure of the films can vary from microcrystalline to amorphous, the main influence being the deposition temperature. Chemical bonding in films is carried out mainly due to the interaction of Si-N, Si-C, C-C, C-N. Despite a significant amount of experimental work to study the properties of Si-C-N films, there are virtually no studies of films deposited by plasma chemical methods using hexamethyldisilazane as the main precursor. The review analyzes the influence of the main parameters of plasma chemical deposition, such as substrate temperature, reagent flow rate, high-frequency discharge power and displacement on the substrate on the physical properties of the films. It is shown that the main mechanism of transport of charge carriers in the investigated films is the space charge limited current. Based on electrical measurements, a number of band parameters as well as parameters of deep traps in a-SiCN films were estimated for the first time.

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