Polyphenolic components of knotwood extracts from Populus tremula (quaking aspen)

Russian Chemical Bulletin - An extract from the knotwood of Populus tremula (quaking aspen) was studied by HPLC, NMR spectroscopy, and mass spectrometry in order to identify new sources of natural...     

Cytotoxic terpenes from Abies sibirica

One new and 16 known compounds were isolated from Abies sibirica.Their structures were assigned mainly on the basis of NMR and MS spectroscopic data.In bioassay for anti-proliferative activity against four human tumor cells,compound 7 exhibited selective anti-proliferative activity against COLO-205 tumor cell with an IC₅₀ value of 0.9μg/mL.     

Triterpenoids from Abies sp. IX. Triterpene lactones from Abies sibirica bark

Four lanostane lactones have been isolated from an ethereal extract of Siberian fir bark — abieslactone and its hydroxy and keto analogs, and also (25R)-24,25-dihydroabieslactone, the structure of which was established on the basis of a chemical and spectral correlation with known compounds.Novosibirsk Institute of Organic Chemistry, Siberian Branch, USSR Academy of Sciences. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 220–225, March–April, 1989.     

Triterpenoids from Abies species. IV. New triterpene acids from the needles of Abies sibirica

Four new triterpene acids of the mariesiic acid series have been isolated from an extract of the needles of the Siberian fir in the form of their methyl esters, and their structures have been established on the basis of chemical transformations, spectral characteristics, and x-ray structural analysis.Novosibirsk Institute of Organic Chemistry, Siberian Branch, USSR Academy of Sciences. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 824–831, November–December, 1987.     

Triterpenoids from Abies species. IV. New triterpene acids from the needles of Abies sibirica

Four new triterpene acids of the mariesiic acid series have been isolated from an extract of the needles of the Siberian fir in the form of their methyl esters, and their structures have been established on the basis of chemical transformations, spectral characteristics, and x-ray structural analysis.     

Polyphenolicic compounds in the extracts of the birch Betula pendula knotwood

Four polyphenolic compounds were isolated from the extracts of the birch Betula pendula knotwood, purified by HPLC and identified by NMR spectroscopy and mass spectrometry. Three compounds were found to be arylheptanoids, two of them being related to the known carpinontriol and casuarinondiol and one being earlier unknown.

     

罗汉果提取物中有效成分的结构分析

罗汉果是广西特产罗汉果属植物[Siraitia grosvenorii（Swingle）]的果实。本文对已分离纯化的罗汉果有效成分，采用UV、FTIR和ESI-MS-MS对其进行结构分析。确定组分A1是罗汉果醇-3-o-[β-D-葡萄吡喃糖基（1-6）-β-D-葡萄吡喃糖苷]-24-o-[β-D-葡萄吡喃糖基（1-2）-β-D-葡萄吡喃糖苷]，组分A2是罗汉果醇-3-o-[β-D-葡萄吡喃糖基（1-6）-β-D-葡萄吡喃糖苷]-24-o-{[β-D-葡萄吡喃糖基（1—2）]-[β-D-葡萄吡喃糖基（1—6）]-β-D-葡萄吡喃糖苷}，组分A3是罗汉果醇-3-o-[β-D-葡萄吡喃糖基（1—6）-β-D-葡萄吡喃糖基（1—2）-β-D-葡萄吡喃糖苷]-24-o-{[β-E-葡萄吡喃糖基（1—2）]-β-D-葡萄吡喃糖基（1—6）]-β-D-葡萄吡喃糖苷}。     

Volatile components of the oleoresin of Abies alba

The composition of the volatile compoents of the oleoresin ofAbies alba Mill, has been studied. In this oleoresin 19 monoterpene compounds have been identified, the main ones of which are - and -pinenes and limonene. Among the 24 sesquitepene compounds identified in the oleoresin, 4 new terpenoids have been found: 10S,11S-himachala-2,3-diene, 10S,11S-himachala-3(12),4-diene, humula-4,9-dien-8-ol, and 4S,5S,10S-selin-6-en-4-ol. For the first time, , , and -himachalenes, 9-epicaryophyllene, intermedeol, and longiborneol have been found in the oleoresins of conifers of the genus Albies. A distinguishing feature of firs of the Albae series is the low content of oxygen-containing monoterpenoids and of sesquiterpenoids of the bisabolane series.Novosibirsk Institute of Organic Chemistry, Siberian Branch, USSR Academy of Sciences. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 193–197, March–April, 1988.     

A novel antioxidant phenyl disaccharide from Populus tremula knotwood

The complete characterization of two compounds obtained from the acetone extract of Populus tremula knotwood has been was achieved using LC-DAD-MS, MS/MS, IR and NMR. The new compounds were unequivocally identified as a mixture of the ester isomers of the (E) and (Z) p-coumarate of 1-O-rutinose. The isomers showed the capacity to inhibit lipid peroxidation induced by tert-butylhydroperoxide and to trap peroxyl radicals, as determined by a chemiluminescence method. These new phenyl disaccharides also showed a significant ORAC (oxygen radical absorbance capacity) value, i.e. 11.7 microM TE (Trolox Equivalents).     

Chemical constituents of the extracts of the knotwood of Pinus roxburghii Sarg. and their antioxidant activity

Russian Chemical Bulletin - Chemical composition of the extract from the Pinus roxburghii Sarg. knotwood was studied for the first time. The extracts were obtained by ultrasound assisted sequential...     

Biological activity and LC-MS profiling of ethyl acetate extracts from Nitraria sibirica (Pall.) fruits

Nitraria sibirica is a traditional Uighur medicine. This study was undertaken to investigate the bioactivity of N. sibirica fruit extract and to evaluate their chemical compositions. The ethyl acetate extract from N. sibirica fruits exhibited the potential antioxidant activity (SC₅₀ = 30.17 ± 0.06 μg/mL) and protein tyrosine phosphatase 1B inhibitory activity (IC₅₀ = 7.15 ± 0.03 μg/mL) in vitro. In order to investigate the active constituents in this extract, a LC-QTOF-MS/MS method was developed and established. A total of 28 compounds including seven cinnamic acids, nine benzoic acids and 12 flavonoids were identified or partially characterised according to the accurate mass and the characteristic fragment ions at low and high collision energy. Most of them were reported for the first time in this plant. Phytochemical profiles of the active extract will help the development and utilisation of N. sibirica in food and medicine.     

Development of a method for determining bornyl acetate in the products of the processing of Abies sibirica

Summary The conditions for the reaction of esters—bornyl acetate—with an alkaline solution of hydroxylamine have been studied by the method of steepest ascent. A method has been developed for determining esters in a CO₂ extract ofAbies sibirica.Krasnodar Scientific-Research Institute of the Food Industry. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 303–306, May–June, 1976.