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Enlarging Knowledge on Lager Beer Volatile Metabolites Using Multidimensional Gas Chromatography
foods Article Enlarging Knowledge on Lager Beer Volatile Metabolites Using Multidimensional Gas Chromatography Cátia Martins 1 , Tiago Brandão 2, Adelaide Almeida 3 and Sílvia M. Rocha 1,* 1 Departamento de Química & LAQV-REQUIMTE, Universidade de Aveiro, Campus Universitário Santiago, 3810-193 Aveiro, Portugal; [email protected] 2 Super Bock Group, Rua do Mosteiro, 4465-703 Leça do Balio, Portugal; [email protected] 3 Departamento de Biologia & CESAM, Universidade de Aveiro, Campus Universitário Santiago, 3810-193 Aveiro, Portugal; [email protected] * Correspondence: [email protected]; Tel.: +351-234-401-524 Received: 30 July 2020; Accepted: 6 September 2020; Published: 11 September 2020 Abstract: Foodomics, emergent field of metabolomics, has been applied to study food system processes, and it may be useful to understand sensorial food properties, among others, through foods metabolites profiling. Thus, as beer volatile components represent the major contributors for beer overall and peculiar aroma properties, this work intends to perform an in-depth profiling of lager beer volatile metabolites and to generate new data that may contribute for molecules’ identification, by using multidimensional gas chromatography. A set of lager beers were used as case-study, and 329 volatile metabolites were determined, distributed over 8 chemical families: acids, alcohols, esters, monoterpenic compounds, norisoprenoids, sesquiterpenic compounds, sulfur compounds, and volatile phenols. From these, 96 compounds are reported for the first time in the lager beer volatile composition. Around half of them were common to all beers under study. Clustering analysis allowed a beer typing according to production system: macro- and microbrewer beers. Monoterpenic and sesquiterpenic compounds were the chemical families that showed wide range of chemical structures, which may contribute for the samples’ peculiar aroma characteristics. -
United States Patent 1191 Lll] 3,983,266 Bahls [451 Sept
United States Patent 1191 lll] 3,983,266 Bahls [451 Sept. 28, 1976 [54] METHOD FOR APPLYING METALLIC 3.776.740 [2/1973 Sivcrz ct al. .......................... .. l06/l SILVER TO A SUBSTRATE OTHER PUBLICATIONS [75] Inventor: Harry Bahls, Wayne, Pa. lvanov et al., Chem. Abs. 43:2548c, I949, [73] Assignee: Peacock Laboratories, Inc., Philadelphia, Pa. Primary Examiner-Ralph S. Kendall [22] Filed: Oct. 9, I974 I 57] ABSTRACT [2!] ,Appl. No.: 513,417 High efficiency deposition of silver on the surface of a substrate is obtained by providing a solution contain [52] [1.8. CI ............................... .. 427/164; 427/165; ing reducible dissolved silver in the presence of an al 427/168; 427/424; 427/426; l06/l kali metal hydroxide and ammonia, all of which are [51] Int. CLZ. ......................................... .. C23C 3/02 applied to the substrate in the presence of an aqueous [58] Field of Search .............. .. l06/l; 427/l68. I69, solution of a moderating reducer containing :1 poly 427/165, I64, 426, 304, 125, 425 hydric alcohol of the formula CH2OH(CHOH),,C H,OH, where n is an integer from 1 to 6. Preferably [56] References Cited the polyhydric alcohol is sorbitol, and in a preferred UNITED STATES PATENTS embodiment a moderator is the form of a thio glycerol is present. 2,996,406 8/l96l Weinrich ........... ............ .. 427/168 3,772,078 ll/l973 Polichcttc ct al ................. .. l06/l X l5 Claims, No Drawings 3,983,266 1 Other objects and advantages of this invention, in METHOD FOR APPLYING METALLIC SILVER TO cluding the economy of the same, and the case with A SUBSTRATE which it may be applied to existing silver coating equip ment and apparatus, will further become apparent BRIEF SUMMARY OF THE INVENTION 5 hereinafter. -
Development and Optimization of Organic Based Monoliths for Use in Affinity Chromatography
University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Student Research Projects, Dissertations, and Theses - Chemistry Department Chemistry, Department of Winter 12-2-2011 Development and Optimization of Organic Based Monoliths for Use in Affinity Chromatography Erika L. Pfaunmiller University of Nebraska-Lincoln, [email protected] Follow this and additional works at: https://digitalcommons.unl.edu/chemistrydiss Part of the Analytical Chemistry Commons Pfaunmiller, Erika L., "Development and Optimization of Organic Based Monoliths for Use in Affinity Chromatography" (2011). Student Research Projects, Dissertations, and Theses - Chemistry Department. 28. https://digitalcommons.unl.edu/chemistrydiss/28 This Article is brought to you for free and open access by the Chemistry, Department of at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Student Research Projects, Dissertations, and Theses - Chemistry Department by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. DEVELOPMENT AND OPTIMIZATION OF ORGANIC BASED MONOLITHS FOR USE IN AFFINITY CHROMATOGRAPHY by Erika L. Pfaunmiller A THESIS Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfilment of Requirements For the Degree of Master of Science Major: Chemistry Under the Supervision of Professor David S. Hage Lincoln, Nebraska December, 2011 DEVELOPMENT AND OPTIMIZATION OF ORGANIC BASED MONOLITHS FOR USE IN AFFINITY CHROMATOGRAPHY Erika L. Pfaunmiller, M.S. University of Nebraska, 2011 Adviser: David S. Hage Affinity chromatography is an important and useful tool for studying biological interactions, such as the binding of an antibody with an antigen. Monolithic supports offer many advantages over traditional packed bed supports in affinity chromatography, including their ease of preparation, low back pressures and good mass transfer properties. -
SYNTHESIS of NOVEL CROWN ETHER COMPOUNDS and Lonomer MODIFICATION of NAFION
SYNTHESIS OF NOVEL CROWN ETHER COMPOUNDS AND lONOMER MODIFICATION OF NAFION by JONG CHAN LEE, B.S., M.S. A DISSERTATION IN CHEMISTRY Submitted to the Graduate Faculty of Texas Tech University in Partial Fulfillment of the Requirements for the Degree of DOCTOR OF PHILOSOPHY Approved August, 1992 L3 ACKNOWLEDGEMENTS I am deeply indebted to Dr. Richard A. Bartsch for his constant encouragement and patience throughout my graduate career. His diligent pursuit of excellence in science inspired me to perform research for the love of it. I would like to thank Drs. Robert D. Walkup, Allan D. Headley, Dennis C. Shelly, Bruce R. Whittlesey. John N. Marx for their willingness to provide help and advice. I would also like to thank friendly co-workers. Dr. T. Hayashita, Marty Utterback, John Knobeloch, Zuan Cong Lu, J. S. Kim, and Dr. Joe McDonough for the wonderful times in the laboratory. I would like to thank Dow Chemical Company U. S. A. and Texas Advanced Technology Program for much of the funding of this research project. I would like to extend gratitude to my wonderful parents and sisters for their support throughout the years that I have spent abroad. Most importantly, I thank my wife Sun Yong without whose endless love and patience none of this would have been possible. 11 TABLE OF CONTENTS ACKNOWLEDGEMENS ii LIST OF TABLES xi LISTOFHGURES xii I. INTRODUCnON 1 Crown Ether Background 1 Cation Complexation by Crown Ethers 2 Synthesis of Monobenzo and Dibenzocrown Ethers 4 Lariat Ethers 1 0 Chromogenic Crown Ethers 1 3 Acyclic Polyether Compounds 1 5 Nafion® lonomer Membrane 1 7 Statement of Research Goal 2 0 II. -
162 Part 175—Indirect Food Addi
§ 174.6 21 CFR Ch. I (4–1–19 Edition) (c) The existence in this subchapter B Subpart B—Substances for Use Only as of a regulation prescribing safe condi- Components of Adhesives tions for the use of a substance as an Sec. article or component of articles that 175.105 Adhesives. contact food shall not be construed as 175.125 Pressure-sensitive adhesives. implying that such substance may be safely used as a direct additive in food. Subpart C—Substances for Use as (d) Substances that under conditions Components of Coatings of good manufacturing practice may be 175.210 Acrylate ester copolymer coating. safely used as components of articles 175.230 Hot-melt strippable food coatings. that contact food include the fol- 175.250 Paraffin (synthetic). lowing, subject to any prescribed limi- 175.260 Partial phosphoric acid esters of pol- yester resins. tations: 175.270 Poly(vinyl fluoride) resins. (1) Substances generally recognized 175.300 Resinous and polymeric coatings. as safe in or on food. 175.320 Resinous and polymeric coatings for (2) Substances generally recognized polyolefin films. as safe for their intended use in food 175.350 Vinyl acetate/crotonic acid copoly- mer. packaging. 175.360 Vinylidene chloride copolymer coat- (3) Substances used in accordance ings for nylon film. with a prior sanction or approval. 175.365 Vinylidene chloride copolymer coat- (4) Substances permitted for use by ings for polycarbonate film. 175.380 Xylene-formaldehyde resins con- regulations in this part and parts 175, densed with 4,4′-isopropylidenediphenol- 176, 177, 178 and § 179.45 of this chapter. -
Monomer Design Strategies to Create Natural Product-Based Polymer Materials Cite This: Nat
Natural Product Reports REVIEW Monomer design strategies to create natural product-based polymer materials Cite this: Nat. Prod. Rep.,2017,34,433 Samantha L. Kristufek, Kevin T. Wacker, Yi-Yun Timothy Tsao, Lu Su and Karen L. Wooley* Covering: 2010–Aug. 2016 In an effort towards enhancing function and sustainability, natural products have become of interest in the field of polymer chemistry. This review details the blending of chemistries developed through synthetic organic chemistry and polymer chemistry. Through synthetic organic chemical transformations, such as functional group interconversion, a protection/deprotection series, or installation of a functional group, Received 4th November 2016 various designs towards novel, synthetic, bio-based polymer systems are described. This review covers DOI: 10.1039/c6np00112b several classifications of natural products – oils and fatty acids, terpenes, lignin, and sugar derivatives – rsc.li/npr focusing on exploring monomers prepared by one or more synthetic steps. 1. Introduction – the power of synthetic organic chemistry to 4.4 Vanillin monomers transform materials science 4.5 Ferulic acid 2. Oils and fatty acids 4.6 Eugenol 2.1 Introduction – oils and fatty acids 4.7 Creosol 2.2 Saturated fatty acids 4.8 Sinapyl alcohol derivatives 2.3 Monounsaturated fatty acids: polymerization through 5. Sugar derivatives carboxylic acid-derived functional groups 5.1 Introduction – sugar derivatives 2.4 Monounsaturated fatty acids: polymerization through 5.2 Mono-substituted monomers and corresponding alkene-derived functional groups glycopolymers 2.5 Monounsaturated fatty acids: polymerization through 5.3 Di-substituted monomers and corresponding polymers both acid- and alkene-derived functional groups 6. Conclusions and future directions 2.6 Polyunsaturated fatty acids 7. -
Salts of Therapeutic Agents: Chemical, Physicochemical, and Biological Considerations
molecules Review Salts of Therapeutic Agents: Chemical, Physicochemical, and Biological Considerations Deepak Gupta 1, Deepak Bhatia 2 ID , Vivek Dave 3 ID , Vijaykumar Sutariya 4 and Sheeba Varghese Gupta 4,* 1 Department of Pharmaceutical Sciences, School of Pharmacy, Lake Erie College of Osteopathic Medicine, Bradenton, FL 34211, USA; [email protected] 2 ICPH Fairfax Bernard J. Dunn School of Pharmacy, Shenandoah University, Fairfax, VA 22031, USA; [email protected] 3 Wegmans School of Pharmacy, St. John Fisher College, Rochester, NY 14618, USA; [email protected] 4 Department of Pharmaceutical Sciences, USF College of Pharmacy, Tampa, FL 33612, USA; [email protected] * Correspondence: [email protected]; Tel.: +01-813-974-2635 Academic Editor: Peter Wipf Received: 7 June 2018; Accepted: 13 July 2018; Published: 14 July 2018 Abstract: The physicochemical and biological properties of active pharmaceutical ingredients (APIs) are greatly affected by their salt forms. The choice of a particular salt formulation is based on numerous factors such as API chemistry, intended dosage form, pharmacokinetics, and pharmacodynamics. The appropriate salt can improve the overall therapeutic and pharmaceutical effects of an API. However, the incorrect salt form can have the opposite effect, and can be quite detrimental for overall drug development. This review summarizes several criteria for choosing the appropriate salt forms, along with the effects of salt forms on the pharmaceutical properties of APIs. In addition to a comprehensive review of the selection criteria, this review also gives a brief historic perspective of the salt selection processes. Keywords: chemistry; salt; water solubility; routes of administration; physicochemical; stability; degradation 1. -
SALTS of FATTY ACIDS
SALTS of FATTY ACIDS Prepared at the 33rd JECFA (1988), published in FNP 38 (1988) and in FNP 52 (1992). Metals and arsenic specifications revised at the 55th JECFA (2000). An ADI 'not specified' was established at the 33rd JECFA (1988) SYNONYMS INS No. 470 DEFINITION These products consist of calcium, potassium or sodium salts of commercial myristic, oleic, palmitic, stearic, acids or mixtures of these acids from edible fats and oils. The article of commerce can be further specified by: - saponification value, - solidification point for the fatty acids obtained from the salts, - iodine value, - residue on ignition including assay of the cation, and - moisture content Assay Not less than 95% total fatty acid salts, dry weight basis DESCRIPTION Hard, white or faintly yellowish, somewhat glossy and crystalline solids or semi-solids or white or yellowish-white powder FUNCTIONAL USES Anticaking agent, emulsifier CHARACTERISTICS IDENTIFICATION Solubility (Vol. 4) Potassium and sodium salts are soluble in water and ethanol; calcium salts are insoluble in water, ethanol and ether Test for cations Heat 1 g of the sample with a mixture of 25 ml of water and 5 ml of hydrochloric acid. Fatty acids are liberated, floating as a solid or oil layer on the surface which is soluble in hexane. After cooling, aqueous layer is decanted and evaporated to dryness. Dissolve the residue in water and test for the appropriate cation. Fatty acid composition Using the Method of Assay, identify the individual fatty sample. The fatty acid(s) in primary abundance should conform to those declared on the label of the product PURITY Free fatty acids Not more than 3% Measure free fatty acids as directed in the method Free Fatty Acids. -
Biochemistry Lab (BT35L) Lab Manual
Department of Biotechnology Sri Jayachamarajendra College of Engineering Mysuru-570006 Biochemistry Lab (BT35L) Lab Manual (Prepared by Dr. S. Nanjunda Swamy and Dr. M. N. Nagendra Prasad) INDEX 1. PREPARATION OF SODIUM ACETATE BUFFER 2. ESTIMATION OF GLUCOSE BY DNS METHOD 3. ESTIMATION OF SAPONIFICATION VALUE OF FATS/OILS 4. ESTIMATION OF ACID VALUE OF FATS/OILS 5. PREPARATION OF PHOSPHOTIDYL CHOLINE FROM EGG YOLK 6. LOWRY METHOD FOR PROTEIN ESTIMATION 7. ESTIMATION OF AMINO ACID BY FORMAL TITRATION 8. DETERMINATION OF ISOELECTRIC POINT OF GLYCINE (PI) 9. SEPARATION OF AMINO ACIDS BY CIRCLULAR PAPER CHROMATOGRAPHY 10. ESTIMATION OF IRON BY WONG’S METHOD Experiment No 1: PREPARATION OF SODIUM ACETATE BUFFER Aim: Preparation of sodium acetate buffer of 0.1M and 4.7 pH (25ml) Principle: Buffer is a solution used to maintain the pH of any biochemical reaction. Procedure: 1. Weigh about 0.205g of sodium acetate. Dissolve it in 15ml distilled water. 2. Dip the electrode of the pre calibrated pH meter in the above solution. 3. Add acetic acid of 0.5M drop by drop till the pH reaches 4.7. 4. Make up the solution to 25ml with distilled water. 5. Store the buffer in a sealed container. Experiment No 2: ESTIMATION OF GLUCOSE BY DNS METHOD Aim: To estimate the amount of glucose in the given ample by DNS method. Principle: This method tests for the presence of free carbonyl group (C=O), of the reducing sugars. The reaction involves the oxidation of this of free carbonyl group (aldehyde functional group present in, glucose and the ketone functional group in fructose) and simultaneous reduction of , 3,5-dinitrosalicylic acid to 3-amino,5- nitrosalicylic acid (a coloured molecule) under alkaline conditions. -
Acrylamide, Sodium Acrylate Polymer (Cas No
ACRYLAMIDE/SODIUM ACRYLATE COPOLYMER (CAS NO. 25085‐02‐3) ACRYLAMIDE, SODIUM ACRYLATE POLYMER (CAS NO. 25987‐30‐8) 2‐PROPENOIC ACID, POTASSIUM SALT, POLYMER WITH 2‐PROPENAMIDE (CAS NO. 31212‐13‐2) SILICONE BASED EMULSION NEUTRALISED POLYACRYLIC BASED STABILIZER (NO CAS NO.) This group contains a sodium salt of a polymer consisting of acrylic acid, methacrylic acid or one of their simple esters and three similar polymers. They are expected to have similar environmental concerns and have consequently been assessed as a group. Information provided in this dossier is based on acrylamide/sodium acrylate copolymer (CAS No. 25085‐02‐3). This dossier on acrylamide/sodium acrylate copolymer and similar polymers presents the most critical studies pertinent to the risk assessment of these polymers in their use in drilling muds. This dossier does not represent an exhaustive or critical review of all available data. Where possible, study quality was evaluated using the Klimisch scoring system (Klimisch et al., 1997). Screening Assessment Conclusion – Acrylamide/sodium acrylate copolymer, acrylamide, sodium acrylate polymer and 2‐propenoic acid, potassium salt, polymer with 2‐propenamide are polymers of low concern. Therefore, these polymers and the other similar polymer in this group are classified as tier 1 chemicals and require a hazard assessment only. 1. BACKGROUND Acrylamide/sodium acrylate copolymer is a sodium salt of a polymer consisting of acrylic acid, methacrylic acid or one of their simple esters. Acrylates are a family of polymers which are a type of vinyl polymer. Synthetic chemicals used in the manufacture of plastics, paint formulations and other products. Acrylate copolymer is a general term for copolymers of two or more monomers consisting of acrylic acid, methacrylic acid or one of their simple esters. -
United States Patent Office Patiented Jan
3,165,556 United States Patent Office Patiented Jan. 12, 1965, 2 ence of excessive amounts of water. In fact, the presence 3,165,556 of water has always been considered to be deleterious in PREPARATION OF DEVNY AND TETRAWNYL the vinylation of aliphatic alcohols. ETHERS OF PENTAERYTHERSTOL The two-step process of the present invention is ad Normata Shachat, Levittown, and James J. Bagiel, Sr., mirably suited to being practiced in a continuous opera Phiadelphia, Pa., assigaors to Rohia & Haas Cort 5 tion. Illustratively, a solution of pentaerythritol and a pany, Philadelphia, Pa., a corporation of Delaware catalytic amount of base in water is saturated with acety No Drawing. Filed Apr. 21, 1961, Ser. No. 104,551 lene under pressure at 0°-25°C. in a suitable reactor. The 2 Claims. (C.260-6E5) base may suitably be selected from sodium and potassium This invention deals with the divinyl and tetravinyl O hydroxides and alkoxides (preferably methoxides). The ethers of pentaerythritol, as new compositions of matter, mixture is then pumped continuously under a pressure Suf and as the products of a new process for preparing them. ficient to prevent the formation of a gas phase through a Vinylation processes are well known in which the gen reaction zone which is held at the reaction temperature eral modus operandi is to mix a substance to be vinylated (130°-200° C.) with acetylene, an acetylene solvent, a suitable catalyst, and 5 After a holding time of from 1 to 20 minutes, the reac reacting the mixture under appropriate conditions of ten tion mixture is passed from the reaction Zone through a . -
Pentaerytritol Cas N°: 115-77-5
OECD SIDS PENTAERYTRITOL FOREWORD INTRODUCTION PENTAERYTRITOL CAS N°: 115-77-5 UNEP PUBLICATIONS OECD SIDS PENTAERYTHRITOL SIDS INITIAL ASSESSMENT PROFILE CAS No. 115-77-5 Chemical Name Pentaerythritol Structural formula CONCLUSIONS AND RECOMMENDATIONS Environment Although the chemical is not readily biodegradable, toxicity to aquatic organisms is very low. PEC/PNEC ratio is less than 1 based on the local exposure scenario in the Sponsor country. Therefore, it is currently considered of low potential risk and low priority for further work. Human health The chemical caused only soft faeces and diarrhoea in a repeated dose study. The chemical is not considered as an irritant to skin and eyes. Within the Sponsor country exposure is well controlled in a closed system. Estimated daily intake via indirect exposures is considered to be low. As margin of safety for indirect exposure is more than 500,000, it is currently considered of low potential risk and low priority for further work. SHORT SUMMARY WHICH SUPPORTS THE REASONS FOR THE CONCLUSIONS AND RECOMMENDATIONS Pentaerythritol is a stable solid and the production volume was ca. 25,000 tonnes/year in 1996 and 1997 in Japan. The chemical is used as intermediate for Alkyd resin, Rosin ester, Explosive and Lubricants. No consumer use is reported. The chemical is classified as ‘Biodegradable’. The bioconcentration factor ranged from 0.3 – 2.1. The potential environmental distribution of pentaerythritol obtained from a generic fugacity model (Mackey level III) showed the chemical will be distributed mainly to water and soil. Predicted -3 environmental concentration (PEClocal) of the chemical was estimated as 4.3 x 10 mg/l and 5.1 x 10-5 mg/l from Japanese local exposure scenario.