properties of resins in pharmacognosy

Pharmacognosy is the study of plants or other natural sources as a possible source of drugs.The American Society of Pharmacognosy defines pharmacognosy as "the study of the physical, chemical, biochemical, and biological properties of drugs, drug substances, or potential drugs or drug substances of natural origin as well as the search for new drugs from natural sources". You can filter down your options by property (mechanical, electrical…), applications, conversion mode and many more dimensions. But what make epoxy resin a versatile resin for these applications. Synthetic resin has properties similar to those of natural resin, but they are chemically different. PROPERTIES 2. (b)Resins upon heating soften and melt. 2.Give the physical and chemical properties of resins (5M). Majority of them undergo However, it has been observed that in majority of the known resins these three aforesaid categories evidently predominates and thus the resulting product consequently falls into one of these groups.It is worth mentioning here that representatives of all the three said groups are rarely present in the same product. Chemical properties: (a)Chemically, resins are terpenes. Compared with other polymers, PET is moderately expensive, shatter-resistant, food resistant, and withstands repeated recycling. Today most natural resins have been largely replaced by synthetic resins, which can be … For example, they can be flexible and ductile or hard and stiff. When dry they are usually hard, transparent or translucent amorphous solids, which readily fuse upon heating. They have an astringent taste. Resins are regarded as end products of destructive metabolism. Define resins and classify with examples (5M). Physical Properties of Resins. » View all Epoxy Resins commercial grades and suppliers in Omnexus Plastics Database This plastic database is available to all, free of charge. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. 2.7.4 Chemical Properties of Resins. You need to be a group member to play the tournament 5. They provide the strength, and the resin matrix binds them together and bonds them to the tooth structure. COMBINATIONS The material is often called Bakelite. Thermosetting resin PF: Phenol resin: 150: High electrical insulation properties. In China the resin from a particular pine tree is used to treat abscesses. c) Copaiba d) Balsam. This includes analysis of their biological, chemical, biochemical and physical properties. Dr.U.Srinivasa, P... Morphology and microscopy of volatile oil drugs.Dr.U.Srinivasa, Professor and... Study on volatile oils and drugs, Dr.U.Srinivasa, Professor and Head, Sriniv... No public clipboards found for this slide, Introduction, Properties, Classification etc., of Resin and Resin combination drugs by Dr.U.Srinivasa, Professor and Head, Srinivas college of Pharmacy, Mangalore- Karnataka. Properties of tannins: ADVERTISEMENTS: Tannins are freely soluble in water, alcohol, glycerol, and acetone and dilute alkalis. You can change your ad preferences anytime. Ans: d. Resins associated with volatile oil are called as: a) Oleo-gum-resin b) Oleo-resin. (b)Their specific gravity is more than one; hence they are heavier than water. treated with alkaline solutions they yield soaps (or, Chinese Medicinal Material Images Database, Solvent Extraction Principles and Practice, Traditional Herbal Medicine Research Methods, Pharmacognosy | Plants | herbal | herb | traditional medicine | alternative | Botany. ... PHARMACOGNOSY, RESINS, TERPENOIDS, Good resistance to acid, heat and water. c) Gum resins d) Volatile resins. slow atmospheric oxidation whereby their colour get darkened with impaired epharmacognosy Looks like you’ve clipped this slide to already. They may also be regarded as Ross Nash, Richard D. Trushkowsky, in Esthetic Dentistry (Third Edition), 2015. See our User Agreement and Privacy Policy. If the resins contain benzoic acids or cinnamic acids then are called as: a) Colophony b) Sandrac. All composite resins are composed of filler particles in a resin matrix. Properties of essential oils Essential oils are mixtures of monoterpenes, sesquiterpenes, and/or phenylpropane derivatives. University. They yield purple, … Pharmacognosy is the study of natural sources such as drugs or crude medicines originating from plants, germs and animals. 6. 3.Define resins and add a note on preparation of resins (5M). Herbral, Health . Tannins and their properties, types, tests,uses and their drugs Resins and their properti... View more. Hydrogen form cation resin with an indicator dye that changes from purple to yellow as the resin exhausts. 3. 2. G. Bachir raho et al., Advances in Pharmacognosy and Phytomedicine. Epoxy resins can be thought of as including pure epoxy resins, thermoset polyester resins, and vinyl-ester resins, although the polyester thermosets really are a separate species. Now customize the name of a clipboard to store your clips. 4.Give the diagnostic characters for Ginger and Podophyllum (5M). Find PowerPoint Presentations and Slides using the power of, find free presentations research about Resin Pharmacognosy PPT Ans: b. Ferulic acid when treated with hydrochloric acid gives: a) Acetic acid b) Umbellic acid 1. Hard surface. Phenolic resins (Phenoplasts) are synthetic thermosetting resins invented by Dr. Leo Baekeland in 1907. Resin properties may be further modified by hydrogenation, which is used as a means of improving color and stability. enriched with carbon, deprived of nitrogen and contain a few oxygen in their Flame retardancy. PH.D. The acidic resins when Resins are regarded as Resoles - These resins are self-curing due to … Dr.Stephen G. Pallardy, in Physiology of Woody Plants (Third Edition), 2008. broadly divided into. Phenolic resins can be divided into two different types: Novolacs - These resins are not reactive and need a cross-linking agent to fully polymerize. The filler particles may range in size from 0.04 μm to over 100 μm. 2. By applications of several disciplines, pharmacognosy from a descriptive subject has again developed into an integral and important disciplines of pharmaceutical sciences. are exclusively based upon the functional groups present in these substances. Print circuit boards, iron grips, power switchboard circuit breakers, grips of pans and kettles, and plywood adhesives: MF: Melamine resin: 110 - 130: Good water resistance. View and Download PowerPoint Presentations on Resin Pharmacognosy PPT. Chemical Composition of Resins. AND RESIN Their chemical properties Pharmacognosy-IIB (Advanced) (PHARM 518) Academic year. Intended for use in cation conductivity columns and disposable cartridges. 6.What is Cannabis? This online quiz is called PHARMACOGNOSY - RESINS. (c)They dissolve in organic solvents. Chapter: Pharmacognosy and Phytochemistry : Drugs Containing Resins Resins are classified mostly on the basis of two important features, that is, on the basis of their chemical nature and secondly as per their association with the other group of compounds like essential oils and gums. 1 2013 Page | 263 diuretic and laxative properties. They are formed in plant secretions and are They are invariably heavier than water having the specific gravity ranging from 0.9-1.25. The University of Lahore. Pharmacognosy Quiz Questions 20 Questions | By Jazmine_cabais | Last updated: Nov 17, 2020 | Total Attempts: 6123 Questions All questions 5 questions 6 questions 7 questions 8 questions 9 questions 10 questions 11 questions 12 questions 13 questions 14 questions 15 questions 16 questions 17 questions 18 questions 19 questions 20 questions CG8-H Strong Acid Gel 8% Crosslinked H 1.8 47 to 56 16 to 50 (0.3 to 1.2) 50 Industrial grade strong acid cation resin in the "ready-to-use" hy- The various chemical properties of resins may be summarized as stated below: 1. Journal of Pharmacognosy and Phytochemistry Vol. Technical products Natural products, besides being used as drugs and thera-peutic aids, are used in a number of other industries as beverages, condiments, spices, in confectioneries and as technical products. BY 5.B.S/Family/A.C/Uses of Benzoin and Asafoetida (5M). 2019/2020 solubility. 2. If you continue browsing the site, you agree to the use of cookies on this website. Start studying Pharmacognosy: Resins. 1.Physical properties: (a)Resins in purified form are amorphous, brittle and hard solids. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Resin from the spruce tree was used by Natural resins are typically fusible and flammable organic substances that are transparent or translucent and are yellowish to brown in colour. Herbral, Health . 1(1), 41-48. Terpenes of resins (when dissolved in essential oils they are 10 Drugs containing monoterpenes, essential oils called balsams) or oils are located in excretion or resin channels of the bark or wood of stems or roots. Resins, in general, are enriched with carbon, deprived of nitrogen and contain a few oxygen in their respective molecules. If you continue browsing the site, you agree to the use of cookies on this website. 5/15/2012 07:33:00 AM. believes that resins are nothing but, 8. 1. Thermoset polyester and vinyl-ester resins cure by exothermic reactions as well when mixed with a catalyst, oftentimes MEK… Resins, in general, are Consequently, the resins are Resin, any natural or synthetic organic compound consisting of a noncrystalline or viscous liquid substance. Course. 2015 42 represent the most significant spoilage yeast within the genus, especially in acidic food complex mixtures of a variety of substances, such as: 7. Resembles pottery. Resins are found to be a An additional class of resins results from the polymerization of one or more pure monomers to low molecular weight resins designed for specific end uses. Resins are a heterogeneous mixture of resin acids (C 20 H 30 O 2), fatty acids, esters of these acids, sterols, alcohols, waxes, and resenes (mixtures of neutral alkali-resistant compounds containing carbon, hydrogen, and oxygen). Learn vocabulary, terms, and more with flashcards, games, and other study tools. respective molecules. mixture of numerous compounds rather than a single pure chemical entity. 2 No. Resins are generally known for having superior strength and exceptional durability under various laboratory and environmental conditions. Tannins and Resins - Lecture notes 2. The oldest resins were derived from plants and animals. See our Privacy Policy and User Agreement for details. In this study, epoxy, the most common type of polymer used by civil engineers is used to produce polymer resin. Basic chemistry. the end-products of, 9. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. In addition, some types of resin can have variable adhesive and mechanical properties. Resins and Resin combinations by Dr .U.Srinivasa, Professor and Head, Sriniv... Isolation,identification and analysis of phytoconstituents. 4. This game is part of a tournament. Polyester resins are transparent, high-density polymers with excellent strength and water resistance with high usage in textiles (where it is known under the tradename “Polyester”) and packaging (where it generally referred to as “PET”). Phenoplasts are some of the oldest synthetic thermosetting polymers and continue to be prominent resins with an impressive worldwide volume of nearly 6 million tons/year1. Pure epoxy resins are usually mixed as two ingredients (a resin and a hardener, often an amine) of equal or integrally proportionate (stoichiometric) ratios to produce a material that cures slowly with little shrinkage. DR.U.SRINIVASA, M.PHARMA, To produce polymer concrete, furan resin, sulfuric acid or orthophosphoric acid as hardener and catalyst and Tri-chloro toluene as curing They occur in special ducts or cavities in plant tissues. One school of thought They are sparingly soluble in chloroform, ethyl acetate and other organic solvents. Resins. Clipping is a handy way to collect important slides you want to go back to later. Resins encompass a great number of compounds with vastly different properties.

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