Triterpenic structures and polyphenols analysis in birch tree foliar buds

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
C Peev ◽  
S Cântă Pânzaru ◽  
L Vlase ◽  
C Dehelean
Keyword(s):  
Birch Tree

Complexation with Hydroxypropyl-gama-Cyclodextrin of Birch Tree Extract Physico-chemical Characterisation of their Binary Products

2008 ◽  
Vol 59 (6) ◽  
Author(s):  
Codruta Soica ◽  
Cristina A. Dehelean ◽  
Valentin Ordodi ◽  
Diana Antal ◽  
Vicentiu Vlaia
Keyword(s):  
Inclusion Complexes ◽  
Water Solubility ◽  
In Vitro Dissolution ◽  
Molar Ratio ◽  
Bark Extract ◽  
Birch Bark ◽  
Preparation Methods ◽  
Birch Tree ◽  
Physico Chemical

Birch bark contains important pentacyclic triterpens that determine an anticancer, anti-inflammatory and antiviral activity. The compounds can be extracted by simple procedures with organic solvents. The major problem of this type of triterpens is their low water solubility which can be increased by physical procedures like cyclodextrin complexation. The aim of present study was to analyse the products between birch bark extract and hydroxypropyl-g -cyclodextrin. Hydroxypropyl-g -cyclodextrin (HPGCD) was used as a host to improve its solubility in water, via inclusion complex formation. In order to obtain the inclusion complexes, 1:2 molar ratio and two preparation methods (physical mixing, kneading) were used. The inclusion complexes were analyzed by in vitro dissolution tests, thermal analysis and X-ray diffraction.

scholarly journals Interrelations of Wood Physical and Mechanical Properties and Patterns of Their Change within the Birch Stem

2021 ◽  
pp. 150-159
Author(s):  
Vladimir I. Fedyukov ◽  
◽  
Vasilii Yu. Chernov ◽  
Maria S. Chernova ◽  
Olga V. Tsoy
Keyword(s):  
Mechanical Properties ◽  
Sound Propagation ◽  
Physical And Mechanical Properties ◽  
Tree Height ◽  
Productive Capacity ◽  
State University ◽  
Wood Fibers ◽  
Middle Volga Region ◽  
Birch Tree ◽  
Birch Trees

The physical and mechanical properties of standing wood are not constant along the tree height and diameter. They also differ depending on the tree species and conditions of its growth. So, the research purpose is to identify patterns of change and interrelations between the parameters of density, compressive strength and sound propagation velocity along the wood fibers inside the stem of a birch tree growing in the forests of the Middle Volga region of Russia, where such research had never been conducted before. The work was carried out on two sampling areas laid out by standard methods in birch forests of natural origin with average productive capacity on the territory of the Scientific-Experimental Forest District of the Volga State University of Technology in the Mari El Republic. The average age of the birch trees is about 70 yrs, breast height diameter is 30 cm, and height is 28.5 m; 14 sample trees were studied; 0.5 m long chucks were cut out from their stems at a height of 1.3 m from the butt end and at relative heights of 0.25H, 0.5H, and 0.75H. Experimental work was carried out in a laboratory environment with modern technical facilities using standard procedures. Mathematical models describing the changes in the parameters stated above and the interrelations between them with regard to the stem diameter at relative heights were obtained. The research results generally confirmed the findings of other researchers on densitograms and other physical and mechanical properties of wood within the tree stem. However, the features listed above were revealed for birch trees growing under such conditions; in particular, it concerns the ratio of strength and density, as well as the wood strength and the velocity of sound propagation through the fibers. The results obtained have both scientific and practical value as a basis for the development of a non-destructive method for predicting technical properties of standing wood as well as timber for producing assortments for special purposes. For citation: Fedyukov V.I., Chernov V.Yu., Chernova M.S., Tsoy O.V. Interrelations of Wood Physical and Mechanical Properties and Patterns of Their Change within the Birch Stem. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 6, pp. 150–159. DOI: 10.37482/0536-1036-2021-6-150-159

The Study of the Kinetics of Obtaining Betulin and Extractive Substances from the Birch Tree Bark

2017 ◽  
Vol 29 ◽  
pp. 42-47
Author(s):  
Sergei I. Tretiakov ◽  
Elena N. Koptelova ◽  
Natalia A. Kutakova ◽  
Nina V. Bagretsova ◽  
Nadezhda L. Voropaeva
Keyword(s):  
Tree Bark ◽  
Birch Bark ◽  
Hydrodynamic Conditions ◽  
Food Industries ◽  
Plywood Industry ◽  
Birch Tree ◽  
Extractive Substances ◽  
Bioactive Agents ◽  
The Given ◽  
Kinetics Of

Birch bark attracts attention of researchers as a source of betulin and other extractive substances (ES) useful for chemical, pharmaceutical and food industries. A challenge is to develop an efficient way of obtaining these bioactive agents. This paper presents a microwave-assisted technique of extracting these substances from the waste birch bark of the plywood industry. The kinetics of the extraction was investigated. With the process going on in the pore-diffusion area, the hydrodynamic conditions of the operation are discussed. An algorithm for calculating the kinetics of the procedure was developed and experimentally confirmed. The estimations for the process were made at constant values of the internal diffusion coefficient. The value of the coefficient was found to be a function of the birch bark fragments dimensions. An equation was established to estimate the duration of the extraction to obtain the given yield of ES and betulin.

scholarly journals Optimization Method of Estimating the Leaf Mass of a Tree

2012 ◽  
Vol 6-7 ◽  
pp. 88-92
Author(s):  
Zhong Cheng Zhang
Keyword(s):  
Qualitative Analysis ◽  
Simulation Model ◽  
Analysis Data ◽  
Optimization Method ◽  
Data Fitting ◽  
Theoretical Derivation ◽  
Actual Weight ◽  
Leaf Mass ◽  
Birch Tree ◽  
Excellent Method

Leaves have the various shapes, but there was no excellent method to estimate the actual weight of the leaves of a tree until now. Based on the methods of qualitative analysis, data fitting, and theoretical derivation, this paper establishes a simulation model on leaf mass and leaf shapes, then estimates the weight of the leaves. Then an example of estimating the leaves mass of a Birch tree is given to show the validity and feasibility of our model.

SEARCH FOR A SOURCE OF TRITERPENE ACIDS IN RUSSIAN BIRCHES

2020 ◽  
pp. 277-282
Author(s):  
Dmitriy Nikolayevich Vedernikov ◽  
Ol'ga Alekseyevna Eregina ◽  
Anna Viktorovna Shemyakina
Keyword(s):  
Raw Materials ◽  
Silver Birch ◽  
Absolute Calibration ◽  
Quantitative Composition ◽  
Birch Bark ◽  
Gas Liquid Chromatography ◽  
Leningrad Region ◽  
Outer Bark ◽  
Triterpene Acids ◽  
Birch Tree

The composition of triterpene acids and triterpene alcohols of the outer bark of a damaged silver birch tree (Betula pendula Roth.) the outer bark of silver birch branches, the outer bark of Betula davurica Pall., B. mandshurica (Regel) Nakai, B. platyphylla Sucacz. and B. costata Trautv. is considered. Silver birch bark was harvested in the Leningrad region. The bark of other species of birches was harvested in the Khabarovsk region. The qualitative composition of triterpene compounds was determined by chromatography-mass spectrometry. The quantitative composition was determined by gas-liquid chromatography and absolute calibration. Butyl esters of acids were preliminarily prepared for GLC analysis of triterpene acids. The outer bark of the eastern species of birches contains significantly more betulinic and oleanolic acid than silver birch. The relative content of triterpene acids is greater in the outer bark of branches and in the bark of damaged silver birches. The increase in acid content is apparently associated with the desire to heal a wound. The main component among the triterpenoids of the investigated raw materials is betulin. For the separation of acids from other triterpenoids, various solubilities of the compounds in solvents and the ability of acids to form poorly soluble salts were used.

Drying Characteristics of Birch Tree Disk Impregnated with NaCl

2011 ◽  
Vol 179-180 ◽  
pp. 285-288
Author(s):  
Liang Qing Yang ◽  
Yi Xing Liu ◽  
Ying Chun Cai ◽  
Qing Feng Sun
Keyword(s):  
Tensile Strength ◽  
Cell Wall ◽  
Linear Dependence ◽  
Nacl Solution ◽  
Drying Characteristics ◽  
Birch Tree ◽  
Conventional Drying ◽  
The Relationship

This Study Investigated the Conventional Drying Characteristics of Birch (Betula Costata) Tree Disk Impregnated with NaCl Solution. the Results Showed that NaCI Content in Wood Was Depending on Impregnated Times, and the Relationship between them Was Linear Dependence. the Drying Duration of Treated Disk Was Longer by 25% than that of Untreated Disk. Na+ and Cl-, which Were Easy to Enter the Cell Wall and Combined with Microfibril, which Was the Major Reason for Enhancing Tensile Strength Perpendicular to the Grain and Restrain Cracks.

scholarly journals On flora semantics in house names found in Vidzeme: materials contained in the 1826 counting of souls in Vidzeme province

2014 ◽  
Vol 38 ◽  
pp. 1-39
Author(s):  
Ilga Jansone
Keyword(s):  
Fruit Trees ◽  
Cultivated Plants ◽  
Black Currant ◽  
Pine Tree ◽  
Birch Tree ◽  
Wide Range ◽  
Herbal Plants ◽  
Oak Tree ◽  
Relationship Of ◽  
The Relationship

On flora semantics in house names found in Vidzeme: materials contained in the 1826 counting of souls in Vidzeme provinceThe information of the counting of souls containing both house names and names of individuals is an essential aspect of historical onomastics.The first counting of souls in Vidzeme took place in 1782 and coincided with the 4th analogous census of the provinces of Russia. Subsequently these took place at irregular intervals, the 5th in 1795, the 6th in 1811, the 7th in 1816, the 8th in 1834, the 9th in 1850, and the final, 10th in 1858.The number of house names entered in the 1826 counting of souls in Vidzeme province (guberna) is 14,500, including those of peasant homes that had been separated from another property whilst retaining the same name. House names based on flora (incl. names of mushrooms) semantics are listed for 574 dwellings, which represent just about 4% of all house names listed for Vidzeme, providing that repeated house names are counted separately. In case of several manors data is missing (lost) for the 1826 census, information for these manors is taken from previous and subsequent censuses.In many instances (279 cases registered) house names were based on the names of deciduous trees found in their immediate vicinity: such names comprise 48.6% of all house names of flora semantic origin, i. e., ozols ‘oak-tree’, bērzs ‘birch-tree’, kārkls ‘osier’, liepa ‘linden tree’, kļava ‘maple tree’, apses ‘aspen’, osis ‘ash tree’, alksnis ‘alder’, lazda ‘hazel-tree’, vītols ‘willow’, ieva ‘bird cherry’.Names based on names of conifers are found (35 instances were recorded, or 6.1% of all house names based on flora semantics), i. e., egle ‘spruce tree’, paeglis, kadiķis ‘juniper’, priede ‘pine-tree’.House names based on names of fruit trees and bushes are only occasionally found in Vidzeme, with 8 recorded instances, or 1.4% of all house names based on flora semantics, i. e., ābele ‘apple tree’, and upene ‘black-currant’.The next sub-group of house names based on flora semantics comprises those based on names of cereals. This is one of the most widely occurring flora semantics sub-groups and contains 58 entries, or 10,1% of all house names based on flora semantics, i. e., auzas ‘oats’, rudzi ‘rye’, mieži ‘barley’, kvieši ‘wheat’, griķi ‘buckwheat’.House names have been found based on terms of 6 legumes, which represents 1% of all house names based on flora semantics, i. e., zirnis ‘pea’, pupa, ‘bean’.Names of common vegetables are the basis for a considerable number of house names. i. e. 53 instances are recorded, representing 9.2% of all house names derived from flora semantics, i. e., rutks, ruduks ‘radish’, kāposts ‘cabbage’, rācenis ‘turnip’, sīpols ‘onion’, ķiploks ‘garlic’, kālis ‘swede’, gurķis ‘cucumber’.House names also derive from terms of widely-cultivated plants such as kaņepes ‘hemp’, apiņi ‘hops’ and lini ‘flax’. These have been the basis for 40 house names, which represent 7% of all hose names based on flora semantics.House names are also based on the names of cultivated and wild herbal plants, and of garden weeds. 47 such cases have been recorded, corresponding to 8.2% of all house names based on flora semantics, i. e., dadzis ‘thistle’, āboliņš ‘clover’, and amoliņš ‘sweet clover’, dille ‘dill’, grīslis ‘sedge’, smilga ‘bent grass’, usne ‘creeping thistle’, pienene ‘dandelion’, pērkones ‘charlocks’, niedre ‘reed’, skosta ‘horse-tail’, vībotne ‘mugwart’.A total of 32 house names based on three flower terms, roze ‘rose’, magone ‘poppy’ and astere ‘aster’ have been recorded; this represents 5.6% of all house names based on flora semantics. The majority (26) of these house names are based on terms of roses.A number of house names in Vidzeme appear to be based on names of mushrooms. 6 such names have been recorded, which represent 1% of all house names based on flora semantics, i. e., bekas ‘boletus’, krimilde, and rudmiese ‘Loctarius’.House names listed in the 1826 counting of souls are based on a wide range of flora semantics, with a clear preference for lexemes associated with names of trees. It is possible that this reflects landscape elements close to these homes, as well as the place that these features have in the relationship of home owners with nature, and their work. In order to draw any deeper conclusions about the presence of flora semantics in house names it would be necessary to examine all relevant historical records up to the present time. O semantyce roślinnej nazw domostw w Widzeme: materiały zawarte w spisie dusz z roku 1826 w krainie WidzemeInformacje o liczeniu dusz, obejmujące zarówno nazwy domostw, jak i nazwiska osób stanowią istotny aspekt onomastyki historycznej.Pierwsze liczenie dusz w krainie historycznej Widzeme odbyło się w 1782 r. i zbiegło się w czasie z podobnym, czwartym spisem, przeprowadzonym w guberniach rosyjskich. Kolejne spisy odbywały się nieregularnie: piąty w 1795 r., szósty w 1811, siódmy w 1816, ósmy w 1834, dziewiąty w 1850, i ostatni, dziesiąty, w roku 1858.Liczba nazw domostw uwzględnionych w spisie dusz z 1826 r. w Widzeme wynosi 14 500, łącznie z domami chłopskimi, będącymi odrębnymi częściami innych posiadłości, choć noszącymi tę samą co one nazwę. Nazwy domów pochodzące od nazw roślin (łącznie z nazwami grzybów) podano w przypadku 574 miejsc zamieszkania, co stanowi tylko ok. 4% ogółu nazw, zakładając, że powtarzające się nazwy liczono osobno. Ponieważ w przypadku niektórych siedzib brak danych (zaginęły) w spisie z roku 1826, informacje o nich zaczerpnięto ze spisów poprzednich i następnych.Nazwy siedzib zamieszczone w spisie dusz z 1826 r. opierają się w szerokim zakresie na semantyce roślinnej, przy czym wyraźnie uprzywilejowane są jednostki leksykalne kojarzone z nazwami drzew. Najprawdopodobniej jest to związane z elementami krajobrazu, znajdującymi się w bezpośrednim sąsiedztwie poszczególnych domostw, ale może też być świadectwem stosunku ich mieszkańców do otaczającej przyrody oraz do swojej pracy. Aby móc wyciągnąć dalsze wnioski na temat obecności semantyki roślinnej w nazewnictwie domostw, konieczne jest przebadanie wszystkich zapisów historycznych aż po czasy nam współczesne.

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