The Experts below are selected from a list of 159 Experts worldwide ranked by ideXlab platform
Maria Luzia F Salatino - One of the best experts on this subject based on the ideXlab platform.
-
propolis research and the chemistry of Plant products
Natural Product Reports, 2011Co-Authors: Antonio Salatino, Caroline C Fernandessilva, Adne Abbud Righi, Maria Luzia F SalatinoAbstract:Covering: 1979 to 2010 Propolis is a honeybee product, composed mainly of wax and Resins. The latter have a Plant origin and contain substances with biological activity. The composition of propolis is variable, and many Plant substances have been identified for the first time in propolis. Some of these compounds have been recognized as having potential medicinal value, and this has stimulated chemical studies of the corresponding Plant sources. Topics covered in this review include the known types of propolis, propolis constituents, evaluation of the biological activities of Resin constituents, and determination of Plant Resin sources.
Shuangying Gui - One of the best experts on this subject based on the ideXlab platform.
-
Reviewing Propolis with Multi-components in the Treatment of Oral Diseases through Multi-pathways and Multi-targets
Mini reviews in medicinal chemistry, 2021Co-Authors: Guokai Wang, Yaotian Tao, Xiangwei Chang, Hongmei Xia, Shuangying GuiAbstract:Propolis is a natural product made from the mixture of Plant Resin, saliva and wax collected by bees. It has been studied and concerned because of its high medicinal value and broad application prospects. Propolis has complex components, which can act on the body through multi-pathways and multi-targets to play the role of antibacterial, anti-inflammatory, anti-tumor and so on, and can be used as an important resource for the prevention and treatment of oral diseases. In this review, we mainly reviewed components of propolis and their physiological activities against oral diseases, as well as the new dosage forms and applications of propolis in oral treatment. The purpose of this review is to explore the advantages of propolis in the treatment of oral diseases and the wide application of propolis in the field of oral health.
Antonio Salatino - One of the best experts on this subject based on the ideXlab platform.
-
Antioxidant Activity of a Geopropolis from Northeast Brazil: Chemical Characterization and Likely Botanical Origin
Evidence-based complementary and alternative medicine : eCAM, 2017Co-Authors: Joselena Mendonça Ferreira, Antonio Salatino, Caroline C. Fernandes-silva, Dejair Message, Giuseppina NegriAbstract:Geopropolis is a product containing wax, Plant Resin, and soil particles. It is elaborated by stingless bees of tribe Meliponini. Methanol extracts of sample of geopropolis produced by Scaptotrigona postica (“mandaguari”) in the state of Rio Grande do Norte (RN, northeast Brazil) were analyzed for the determination of standard parameters (total phenols, total flavonoids, and radical scavenging activity) and chemical characterization by HPLC-DAD-MS/MS analysis. The sample analyzed has high contents of total phenols and flavonoids, as well as high antioxidant activity. The constituents characterized were mainly flavonols, such as quercetin methyl ethers, and methoxychalcones. Such chemical profile is similar to the composition of a green propolis from the same area of RN, which is produced by Africanized Apis mellifera, using shoot apices of Mimosa tenuiflora, popularly known as “jurema-preta.” This finding provides evidence that “mandaguari” geopropolis and honeybee propolis have the same botanical origin in RN. The sharing of a Plant Resin source by phylogenetically distant bees (Apinae and Meliponinae) suggests that bee genetic factors play little role in the choice of Plants for Resin collection and that the availability of potential botanical sources plays a decisive role.
-
propolis research and the chemistry of Plant products
Natural Product Reports, 2011Co-Authors: Antonio Salatino, Caroline C Fernandessilva, Adne Abbud Righi, Maria Luzia F SalatinoAbstract:Covering: 1979 to 2010 Propolis is a honeybee product, composed mainly of wax and Resins. The latter have a Plant origin and contain substances with biological activity. The composition of propolis is variable, and many Plant substances have been identified for the first time in propolis. Some of these compounds have been recognized as having potential medicinal value, and this has stimulated chemical studies of the corresponding Plant sources. Topics covered in this review include the known types of propolis, propolis constituents, evaluation of the biological activities of Resin constituents, and determination of Plant Resin sources.
Lyn Wadley - One of the best experts on this subject based on the ideXlab platform.
-
Putting ochre to the test: replication studies of adhesives that may have been used for hafting tools in the Middle Stone Age.
Journal of human evolution, 2005Co-Authors: Lyn WadleyAbstract:Substantial frequencies of Middle Stone Age (MSA) lithics from Rose Cottage and Sibudu Caves in South Africa have red ochre on their proximal and medial portions. Residue studies suggest that the tools were hafted and that the ochre may be part of the adhesive used for hafting the tools. Replication studies show that ochre is indeed a useful loading agent for adhesive; however, there are other potential loading agents. It is also possible to use unloaded Plant Resin, but this agent is brittle and difficult to work with. It appears that people living in the MSA had wide knowledge of ingredients suitable for hafting tools, and that they chose different adhesive recipes because of the required properties of the adhesive. Brittle, unloaded adhesive allows a projectile head to disengage its haft and imPlant itself in an animal; robust adhesive keeps a spearhead safely in its shaft.
-
Microscopic residues as evidence of hafting on backed tools from the 60 000 to 68 000 year-old Howiesons Poort layers of Rose Cottage Cave, South Africa
Southern African Humanities, 2004Co-Authors: N. E. Gibson, Lyn Wadley, B. S. WilliamsonAbstract:Backed tools from the Howiesons Poort Industry of Rose Cottage Cave often have ochre on or near their backed edges rather than on their working edges. This suggests a use for ochre in the hafting process of the tools, perhaps as an ingredient in mastic that would have included Plant Resin. The proximity of Plant tissue, Plant fibre and white starchy deposit to the ochre on the backed tools may also be the consequence of hafting. Backed blades appear to have been hafted laterally, whereas segments might have been placed transverse to their hafts. Obliquely backed blades were possibly hafted with their short axis (the backed edge) in the haft.
Rosnah Zakaria - One of the best experts on this subject based on the ideXlab platform.
-
Correlation studies between surface tension energy and ionic mobility in silicone - Dammar thin film for dye sensitized solar cells
2017Co-Authors: Rosnah Zakaria, Azizah Hanom Ahmad, Mohamad Fariz Mohamad Taib, Oskar Hasdinor Hassan, Muhd Zu Azhan Yahya, Malik Marwan AliAbstract:Organic thin film system consisting of Silicone-dammar (SD) polymer Resin was prepared and studied with respect to their electrochemical properties. Dammar which is a local Plant Resin (Dipterocaupacea sp) was mixed with silicone in various compositions and the two components were modified by using a solvent. A thin film layered on glass slaid was obtained by Doctor Blade method and cured at room temperature. Silicone-dammar with a composition ratio of 80:20 (SD20) showed the highest non-wetting angle at 90.13 degrees however the sample with a composition ratio of 90:10 (SD10) showed the highest surface tension energy at 179.80 J in the contact angle test. Electrochemical Impedance Spectroscopy (EIS) analysis was done to investigate the electron transport and it was found that the SD10 sample provides a good medium for ionic mobility.
-
The Performance of Modified Silicone-Dammar Resin in Nanoindentation Test
2012Co-Authors: Rosnah Zakaria, Azizah Hanom AhmadAbstract:Dammar Plant Resin (dipterocaupecea sp.) was mixed with silicone in various wt% and these two components were modified by using a volatile organic solvent to form Siliconedammar (SD) coating material. A thin SD coating film layered on aluminium Q-panel was obtained by using spin coating method and cured at room temperature, labeled as SD0, SD5, SD10, SD15, SD20, SD25, SD30, SD35, SD40 and SD45 according to weight % of dammar. A nano-indentation test was carried out to investigate the mechanical performance of the coating film in nanoscale measurement. From the creep indentation profile, the elastic behavior of the coating material was evaluated and result shows that SD5, SD35 and SD40 have high modulus of elasticity. By using Berkovich nano-indentation with Vickers Hardness formula, SD 10 was found to be the hardest coating with hardness of 28.533 Pa and highest reduced modulus (Er) of 4.89E+02 MPa.
-
The Influence of Dammar Resin as a Natural Resin on Corrosion Protection in Silicone Coatings
2010Co-Authors: Rosnah Zakaria, Asma Hayati AhmadAbstract:Dammar Plant Resin (dipterocaupecea sp .) was mixed with silicone in various wt% and these two components were modified by using a volatile organic solvent. A thin coating film layered on aluminium Q‐panel was applied using spin coating method and cured at room temperature. Electrochemical Impedance Spectroscopy (EIS) analysis was done to investigate the corrosion potential property of the coating and it was found that 15wt% of dammar content increased the coating resistance up to 2.88E+07 S/cm after exposure to 3% of NaCl solution for 15 days. Results from infra red analysis (FTIR) revealed that some changes in the structure of Silicone‐Dammar (SD) organic binder system has occurred.
-
Adhesion and Water Repellent Properties Of Nascent Dammar—Silicone Thin Film: A Bio Mimicry Approach
AIP Conference Proceedings, 2009Co-Authors: Rosnah Zakaria, Asma Hayati AhmadAbstract:Dammar, a local Plant Resin (Dipterocaupacea sp) has been used in coating formulation to produce dammar‐modified silicone Resin. Dammar and silicone were mixed in various compositions and then were coated onto Aluminum Q‐panel by using spin coating method and left to dry at room temperature. Adhesion property was investigated by using impact test and pull‐off test. There were no significant damage and delaminations were observed at the panel coated with 15 wt.% of dammar that has undergone the impact test. Hence, the addition of more than 15 wt.% of dammar resulted in large delaminations and cracks on the coating materials. Results from pull off test also showed that 15 wt.% of dammar organic coating has strong adhesion, 108 Psi. It made 15 wt% as optimized composition. This optimized composition was added with nanopowder as rheological modifier or additive. Again the modified samples were undergone the impact and pull off test to study the effect of adhesiveness. Contact angle measurement of wettability ...