Latest Issue: No. 1, Vol. 2, 2022
☐ Atomic Force Microscopy and Energy-dispersive X-ray spectroscopy study of α-HgS microcrystals on XVII century Georgian red ink manuscript
1 Ilia State University, Ivane Beritashvili Center of Experimental Biomedicine, Tbilisi, Republic of Georgia
2 National Center of Manuscripts, Georgian Technical University, Tbilisi, Republic of Georgia
Keywords: AFM, EDS, Solid state surface research, Kurtosis, Skewness, Chemical element spectra
J. Geo. Chem. Soc., 2022, Vol. 2, Issue: 1, ID: 26
Abstract. Surface measurements of XVII century Georgian manuscripts on paper were made using Atomic Force Microscopy (AFM) and Energy-dispersive X-ray spectroscopy (EDS). From AFM data, the surface quantities (skewness, kurtosis, and average roughness) for red ink and its microcrystals were calculated on different areas of red ink manuscript. From EDS data, chemical element content on the surface of XVII century Georgian red ink manuscript samples were estimated. AFM data were collected from 9.5 µm², 30 µm², and 100 µm² manuscript surface scan areas. EDS data were recorded out of 5 µm², 50 µm², 100 µm², 500 µm², 1 mm², and 2.5 mm² scan areas of manuscript. The angles of 5 microcrystals corresponding to ink surface plane were evaluated. All of them were approximately 80˚. Analysis of both data indicate that on the surface of red ink the α-HgS trigonal microcrystals were formed. In particular, in HgS molecule, mercury content is 86% and sulfur is 14%, which is very close to our EDS data. These results approve that XVII century Georgian red ink manuscript contains HgS molecules rather mercury and sulfur atoms separately. The results indicate that the crystals presented on the surface of XVII century red ink manuscript have α-HgS nature.
Recieved: 16-03-2022 | Web published: 20-03-2022 | Views: 343
☐ The current state of arsenic deposit in the Lukhuni Gorge in Accordance with the 2021 Data
1 LEPL National Environmental Agency of the Ministry of Environment Protection and AgricultureTbilisi, Georgia
2Georgian Technical University, Tbilisi, Georgia
Keywords: Sampling, Arsenic, Environment Water, Soil
J. Geo. Chem. Soc., 2022, Vol. 2, Issue: 1, ID: 34
Abstract. The study deals with chemical pollution of the environment, in particular arsenic contamination of soil and water, which is a highly pressing problem for both Georgia and the world. The solution is to develop innovative remedial technology based on the ability of plants and microorganisms to absorb a wide range of chemical pollutants from the environment.
Toxicity of arsenic and its compounds is well known. In the seventies of the last century, their carcinogenic properties were established. Still, arsenic compounds are widely used in technology, agriculture, medicine, etc., Arsenic is a natural component of the earth’s crust and is spread in any environment, air, water and soil. In a number of countries arsenic is naturally of high contents in the ground waters.
Recieved: 30-11--0001 | Web published: 30-11--0001 | Views: 402
☐ Spectrophotometric determination of promethazine hydrochloride with sodium persulphate in drug release experiment in vitro
Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, 3 I.Chavchavadze ave, Tbilisi, 0179, Georgia
Keywords: sodium persulphate, promethazine hydrochloride, pH of reaction medium
J. Geo. Chem. Soc., 2022, Vol. 2, Issue: 1, ID: 35
Abstract. A rapid and simple spectrophotometric procedure for the determination of promethazine hydrochloride in buffer solution is proposed via the oxidation of the drug. The promethazine hydrochloride is oxidized with sodium persulphate in acidic medium, which leads to form a dark pink to reddish color product, that has a maximum absorption at 532 nm. Influence of different persulphates acidity of the reaction medium and concentration of sodium persulphate were studied in order to enhance the sensitivity of the proposed method. It was found that Beer’s law is obeyed within the concentration range of 5.0 – 80.0 μg/mL, with 2.0 μg/mL of detection limit. The developed method was applied for estimation of released promethazine hydrochloride from microemulsion systems.
Recieved: 30-11--0001 | Web published: 11-05-2022 | Views: 313
☐ 3,5-Bis(trifluoromethyl)phenyl ammonium triflate (BFPAT) as efficient organocatalysts for the combinatorial synthesis of xanthenes
1Department of Chemistry, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
2School of Science and Technology, The University of Georgia, Tbilisi, Georgia
Keywords: Organocatalyst, Green procedure, Xanthene, Multicomponent reactions, β-naphthol
J. Geo. Chem. Soc., 2022, Vol. 2, Issue: 1, ID: 36
Abstract. A green and efficient one-pot method has been developed for the synthesis of 1,8-dioxooctahydroxanthenes, 14-phenyl-14H-dibenzo[a,j]xanthene and tetrahydro benzoxanthene-11-ones using 3,5-bis (trifluoromethyl) phenyl ammonium triflate (BFPAT) as a highly efficient organocatalyst. The procedure offers several advantages, including a cleaner reaction profile, avoiding the use of typical toxic catalysts, moisture resistance, air tolerance, and low prices, which are the present method advantages.
Recieved: 30-11--0001 | Web published: 17-05-2022 | Views: 258
☐ Prospects of using biologically active substances of dog-rose and laurel wild-growing in Georgia
1Akaki Tsereteli State University
2Batumi Shota Rustaveli State University
Keywords: CO2 extraction, dog-rose oil, laurel oil, phenolic compounds, antioxidant activity.
J. Geo. Chem. Soc., 2022, Vol. 2, Issue: 1, ID: 37
Abstract. The use of natural plant components (fatty oils) and biologically active additives (extracts, vitamins, essential oils) strengthens the beneficial effects of cosmetic oils. When using biologically active additives, the skin is enriched with all the necessary nutrients, which helps to obtain the desired effect. Research covered the fruits of dog-rose Rosa canina L. (family Rosaceae) and laurel Laurus nobilis L. (family Lauraceae) that grow wild-growing in Georgia. We used superfluid CO2 extraction to obtain the extract from raw materials. Oils were obtained with yield capacity: dog-rose oil - 8.12 - 10.17% whose refraction indexes 1.4782 units and laurel oil - 4.9 - 6.11% with the refraction index of 1.4723. From the remaining crushed seeds, using co-solvent, we obtained the extracts rich in phenolic compounds: total phenols from dog-rose crushed seeds - 3032 mg/100g, and total flavonoids at 1501 mg/100 g by dry mass. Total phenols from laurel crushed seeds - 283.03 mg/100 g and total monomeric anthocyanins at 135 mg/100 g by dry mass. The antioxidant activity of hydrophilic extracts was determined – dog-rose extract - In %-54, laurel extract- In %-42.
Recieved: 30-11--0001 | Web published: 03-06-2022 | Views: 161