scholarly journals Chemical Composition of European Propolis: Expected and Unexpected Results

2002 ◽  
Vol 57 (5-6) ◽  
pp. 530-533 ◽  
Author(s):  
Vassya Bankova ◽  
Milena Popova ◽  
Stefan Bogdanov ◽  
Anna-Gloria Sabatini
Keyword(s):  
Chemical Composition ◽  
Alpine Region ◽  
Two Samples ◽  
Chemical Pattern ◽  
Ferulic Acids

Ten propolis samples from Bulgaria, Italy and Switzerland were analyzed by GC-MS. As expected, most samples displayed the typical chemical pattern of “poplar” propolis: they contained pinocembrin, pinobanksin and its 3-O-acetate, chrysin, galangin, prenyl esters of caffeic and ferulic acids. Two samples differed significantly: one from the Graubünden Alpine region, Switzerland, rich in phenolic glycerides, and one from Sicily which contained only a limited number of phenolics and was rich in diterpenic acids.

Chemical Composition of Two Samples of Essential Oil ofSatureja boliviana(Benth.) Briq. from Peru and Bolivia

1996 ◽  
Vol 8 (3) ◽  
pp. 307-309 ◽  
Author(s):  
Roser Vila ◽  
Begoña Milo ◽  
Cecilia Labbé ◽  
Orlando Muñoz ◽  
Emma Urrunaga Soria ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Two Samples

scholarly journals Phytochemical analysis of diuretic collection

2016 ◽  
Author(s):  
O. H. Doroshenko ◽  
S. M. Marchyshyn
Keyword(s):  
Chemical Composition ◽  
Hplc Method ◽  
Hydroxycinnamic Acids ◽  
Phytochemical Analysis ◽  
Phenolic Substances ◽  
Ferulic Acids

Chemical composition of diuretic collection was studied. The presence of phenolic substances namely flavonoids, hydroxycinnamic acids and coumarines was proved. By HPLC method rutin, hiperoside, isoquercetin, luteolin, apigenin, coumarin, umbelliferon, scopoletin, chlorogenic, rosmarinic and ferulic acids were identified and their content was set.

ROOM TEMPERATURE MAGNETIC ANOMALIES IN BENZENE TREATED Bi–Pb–Sr–Ca–Cu–O POWDER

1991 ◽  
Vol 05 (21) ◽  
pp. 1447-1456 ◽  
Author(s):  
A. R. HARUTUNYAN ◽  
L. S. GRIGORYAN ◽  
A. S. KUZANYAN ◽  
A. A. KUZNETSOV ◽  
A. A. TERENTIEV ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Chemical Composition ◽  
Room Temperature ◽  
Microprobe Analysis ◽  
Magnetic Anomalies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Two Samples ◽  
Field Dependent ◽  
History Of

Two samples of benzene-treated Bi–Pb–Sr–Ca–Cu–O powder exhibited at 300 K magnetic field dependent diamagnetism and magnetization irreversibility. The treatment with benzene resulted also in the appearance of microwave absorption at low magnetic fields, while is sensitive to magnetic history of the sample. From X-ray diffraction data one can see that upon benzene treatment the reflections of 85 K and 110 K phases do not change practically, but a series of new reflections appeared, indicating a lattice modulation with 4.9 nm periodicity. A microprobe analysis revealed substantial inhomogeneity of chemical composition across the samples. The room temperature anomalies were weakened in one sample and vanished in the second upon thermal cycling.

Antibacterial Activity and Chemical Composition of the Essential Oil of Grammosciadium platycarpum Boiss. from Iran

2005 ◽  
Vol 60 (1-2) ◽  
pp. 30-34 ◽  
Author(s):  
Ali Sonboli ◽  
Fereshteh Eftekhar ◽  
Morteza Yousefzadi ◽  
Mohammad Reza Kanani
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Antibacterial Activities ◽  
Gram Negative Bacteria ◽  
Gram Negative ◽  
Two Samples

The chemical composition of the essential oils obtained from two samples (GP1 and GP2) of Grammosciadium platycarpum Boiss. was analyzed by GC and GC-MS. The analysis of the oils resulted in the identification of twenty-two constituents. Linalool (79.0% - GP1, 81.8% - GP2) and limonene (10.0%, 5.8%) were found to be the major components, respectively. The in vitro antibacterial activities of these oils and their main compounds against seven Gram-positive and Gram-negative bacteria were investigated. The results exhibited that the total oils and their major components possess strong to moderate activities against all the tested bacteria except for Pseudomonas aeruginosa.

scholarly journals Hygienic indicators and chemical composition of Prgica cheese produced from raw and pasteurised milks

2013 ◽  
Vol 31 (No. 3) ◽  
pp. 217-221
Author(s):  
K. Valkaj ◽  
S. Kalit ◽  
M.T. Kalit ◽  
W.L. Wendorff
Keyword(s):  
Chemical Composition ◽  
Microbiological Quality ◽  
Raw Milk ◽  
Red Pepper ◽  
Aspergillus Ochraceus ◽  
Family Farms ◽  
Three Samples ◽  
Candida Famata ◽  
Two Samples ◽  
Red Peppers

The hygienic indicators and chemical composition of Prgica cheese produced from raw and pasteurised milks as well as the microbiological quality of dry red pepper used in the cheese production were investigated.. Prgica cheeses and originally packed dry red peppers were collected from five family farms and five vacuum-packed Prgica cheese samples were purchased from the supermarkets. Significantly lower fat (P < 0.01), protein, and total solids contents (P < 0.0001) of artisanal Prgica cheese in comparison to Prgica cheese purchased from the supermarkets were detected. Two samples of cheese produced on family farms and three samples purchased from the supermarkets had high numbers of yeasts and moulds. The yeasts Mucor sp. and Candida famata, and moulds Aspergillus niger and Aspergillus ochraceus, were detected in dry red pepper. The results showed that there was potential yeast and mould contamination among the Prgica cheeses produced from raw milk, as well as Prgica cheeses purchased from the supermarkets, produced from pasteurised milk under controlled conditions, also contained high numbers of yeasts and moulds probably due to contamination by dry red pepper used in their production.  

Determination of Chemical Composition of Turkish Propolis

2001 ◽  
Vol 56 (7-8) ◽  
pp. 666-668 ◽  
Author(s):  
Kadriye Sorkun ◽  
Banu Süer ◽  
Bekir Salih
Keyword(s):  
Chemical Composition ◽  
The Other ◽  
Aromatic Acids ◽  
Gas Chromatograph ◽  
Main Compound ◽  
Similar Chemical ◽  
Two Samples ◽  
Ethanol Extracts ◽  
Acid Esters

The aim of the present work is to study the chemical composition of Turkish propolis. Propolis samples were collected from different regions of Turkey (Bursa, Erzurum-Askale, Gumushane-Sogutagil and Trabzon-Caglayan) in 1999. Ethanol extracts of propolis (EEP) were prepared for chemical analysis, using gas chromatograph coupled with mass spectrometry (GC-MS). Our findings show that propolis samples from Trabzon and Gumushane region have a similar chemical composition. In both samples aromatic acids, aliphatic acids and their esters, and also ketone derivatives are the main compound groups. The chemical composition of the single sample that was collected from Erzurum region shows a very different pattern than the other two samples. In this propolis, the main compounds are aromatic acid esters and alcohols. However, it contains a high amount of amino acids compared to the other samples. The other samples collected from three different region of Bursa City are rich with flavavones, aromatic acids and their esters, terpenoids, flavones and ketones

scholarly journals Assessment of the Chemical Composition in Different Dental Implant Types: An Analysis through EDX System

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 882 ◽  
Author(s):  
Fernando José Dias ◽  
Ramón Fuentes ◽  
Pablo Navarro ◽  
Benjamin Weber ◽  
Eduardo Borie
Keyword(s):  
Chemical Composition ◽  
Dental Implant ◽  
Morphological Characteristics ◽  
Biological Response ◽  
Point Of View ◽  
Variable Pressure ◽  
Implant Surface ◽  
Structural Morphology ◽  
Two Samples ◽  
Bone Level

The use of dental implants has been increasing in the last years; however, their chemical composition is an important issue due to the fact that the implant surface may suffer a corrosion process, allowing the possibility of ions being released and resulting in a possible biological response. Thus, the aim of this study was to evaluate the morphological analysis of the surface and chemical composition of different implant types through an energy-dispersive X-ray spectrometry (EDX) system. Eight dental implant models from different manufacturers were analyzed using variable pressure scanning electron microscopy (VP-SEM) and EDX. The chemical composition and general characteristics of the structural morphology in different dental implant surfaces were analyzed randomly. Nitrogen was identified in two samples, while zirconium was observed in only one model. Aluminium was identified in five samples ranging between 4% and 11% of its composition. Regarding the morphological characteristics, two samples from the same manufacturer had the most irregular surface designed to increase the contact surface, while the others revealed their surfaces with roughness at the micrometric level with no major irregularities. In conclusion, despite the morphology of implants being similar in most of the analyzed samples, more than 50% of them, which are brands of implants available on the market, showed aluminium on the implant surface. Finally, STR (Bone level, Roxolid), DENT (Superline) and NEO (Helix GM) could be considered, among the analyzed samples, the safest implants from the point of view that no aluminium was detected in their chemical composition.

Comparative Study of Yield, Chemical Composition and Antioxidant Activity of Wild Algerian Lavandula stoechas L. Obtained by Ultrasound Pre-treatment and by Conventional Hydrodistillation

2018 ◽  
Vol 16 (S1) ◽  
pp. S109-S118 ◽  
Author(s):  
L. Chekoual ◽  
A. Aissat ◽  
K. Ait-Kaci Aourahoun ◽  
T. Benabdelkader
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Essential Oils ◽  
Treatment Time ◽  
Quantitative Difference ◽  
Flame Ionization ◽  
Lavandula Stoechas ◽  
Two Samples ◽  
Pre Treatment ◽  
Two Populations

The paper presents research results concerning the influence of ultrasonic pre-treatment (time intervals of 10, 20, 30, 45, and 60 min) on the process of extraction of essential oils from wild Algerian Lavandula stoechas. Tests were carried out in two populations. A sonication pre-treatment time of 10 min followed by 90 min of hydrodistillation (US-HD) gives a yield of 1.60 ± 0.1% of Kodiat essential oils (KEO). This pre-treatment time proved to be the best when compared with other pretreatment times. However, overall best yield (1.03 ± 0.07%) of El-Kahla essential oils (EEO) was obtained at 60 min of pre-treatment. These yields are higher compared with those (0.64 ± 0.02% and 0.50 ± 0.02%) obtained after 180 min of only hydrodistillation (HD) for the two samples of Lavandula stoechas, respectively. About 90.69% and 89.36% of total compounds were identified using chromatography–mass spectrometry (GC– MS) in KEO and EEO treated by ultrasound versus untreated samples (89.26% and 76%, respectively). A qualitative and quantitative difference in chemical composition between the essential oils of treated and untreated samples of the two harvesting sites was found. The percentage of most of the major compounds (fenchone, camphor, 1,8-cineole, bornylacetate, myrtenyl-acetate, and viridiflorol) and other compounds identified is higher in treated samples. GC/FID (flame ionization detector) analysis of KEO showed that the percentage of fenchone and camphor as major components is greater at 60 and 20 min of ultrasonic (US) pretreatment, respectively, compared with HD and the other US pre-treatment times. Results of the present study clearly indicated that sonication treatments are effective in enhancing the antioxidant activity of Lavandula stoechas extracts and could be further explored for commercial purposes to benefit consumers and the environment.

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