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Journal articles on the topic 'Hydrochlorid acid'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Seel, F., and J. Schuh. "Über die Umsetzung von Kupfersulfat mit Carbonsäuren und Carbonsäurederivaten in wäßrigen Lösungen unter hydrothermalen Bedingungen/The Reaction of Copper Sulfate with Carboxylic Acids and their Derivatives in Aqueous Solutions under Hydrothermal Conditions." Zeitschrift für Naturforschung B 42, no. 2 (1987): 157–62. http://dx.doi.org/10.1515/znb-1987-0207.

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Abstract Under hydrothermal conditions aqueous solutions of copper(II) sulfate (1) are reduced by means of saturated fatty acids with hydrogen at the α-atom to yield crystalline copper. In all cases carbon dioxide is liberated and lower fatty acids and ketones can be identified as reaction products. α-Hydroxy and α-aminocarboxylic acids proved to be very effective reducing agents towards 1. The yield of copper varied from 2 to 2.5 mol Cu per 1 mol of amino acid. The reaction of 1 is suppressed by sulfuric acid. The presence of hydrochlorid acid or chlorides leads to the precipitation of copper

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2

Korhonen, P., T. Vesala, Y. Viisanen, and H. Lihavainen. "A theoretical study on ternary condensation and evaporation of water, ammonia and hydrochlorid acid." Journal of Aerosol Science 28 (September 1997): S177—S178. http://dx.doi.org/10.1016/s0021-8502(97)85089-6.

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3

Sekine, Hideki, H. Suzuki, T. Miyanaga, and J. H. Chen. "The Micromechanics Study of Crack Propagation in a Cross Ply E-Glass/Epoxy Laminate under Hydrochlorid Acid." Key Engineering Materials 51-52 (January 1991): 143–48. http://dx.doi.org/10.4028/www.scientific.net/kem.51-52.143.

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4

Šindelář, Karel, Jiří Holoubek, Emil Svátek, Jan Metyš, Hana Blehová, and Zdeněk Polívka. "Potential antihistaminics: Tricyclic carboxylic acids derived from 6,11-dihydrodibenzo[b,e]thiepine and 4,9-dihydrothieno[2,3-c]-2-benzothiepine." Collection of Czechoslovak Chemical Communications 56, no. 11 (1991): 2482–93. http://dx.doi.org/10.1135/cccc19912482.

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Reaction of nitrile IVa with the Grignard’s reagent 1-methyl-4-piperidylmagnesium chloride gave carbinol XIb as product. Carbinols XIa and XIb were dehydrated and hydrolysed with dilute hydrochloric acid to give hydrochlorides of the tricyclic amino acids Vb and Vc. Isomeric compounds with a carboxyl group in position 9 of the tricyclic skeleton were obtained either by hydrolysis of the formely prepared nitrile VIIb (compound VIIIb) or on reaction of bromoketone VIa with 1-methyl-4-piperidylmagnesium chloride, nucleophilic substitution of the bromine atom by the cyano group at the stage of car

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5

Hill, D. L. "Development of taste responses in the rat parabrachial nucleus." Journal of Neurophysiology 57, no. 2 (1987): 481–95. http://dx.doi.org/10.1152/jn.1987.57.2.481.

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Extracellular responses from neurons in the parabrachial nuclei (PBN) were studied in rats 4 days old to adulthood during chemical stimulation of the tongue with monochloride salts, citric and hydrochloric acids, sucrose, sodium saccharin, and quinine hydrochloride. Multiunit taste responses were recorded in rats at 4-7 days of age and single-unit responses were recorded from 121 neurons in four other age groups of 14-20 days, 25-35 days, 50-60 days, and adults. PBN neurons in rats 4-7 days old consistently responded to 0.1 M solutions of NH4Cl and NaCl, to 0.5 M solutions of NH4Cl, NaCl, and

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6

Kafka, Stanislav, Jan Kytner, Alexandra Šilhánková, and Miloslav Ferles. "Hydroboration of 1-(5-hexenyl)piperidine and trans–1-(3-hexenyl)piperidine." Collection of Czechoslovak Chemical Communications 52, no. 8 (1987): 2035–46. http://dx.doi.org/10.1135/cccc19872035.

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1-(5-Hexenyl)piperidine (Ia) and trans-1-(3-hexenyl)piperidine (Ib) were hydroborated with tetrahydrofuran-borane, diborane in situ, 9-borabicyclo[3.3.1]nonane and triethylamine-borane. The hydroboration products were converted to 1-piperidinylhexanols IIa-IIe by hydrolysis with hydrochloric acid and subsequent oxidation with hydrogen peroxide in an alkaline medium. In addition to the alcohols IIa-IIe, the reaction also gave 1-hexylpiperidine (Ic). In the reactions with diborane in situ and triethylamine-borane, thermal isomerization of the hydroboration products was also studied. Hydroboratio

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7

Yin, Xiaojun, Guohua Xie, Tao Zhou, et al. "Simple pyridine hydrochlorides as bifunctional electron injection and transport materials for high-performance all-solution-processed organic light emitting diodes." Journal of Materials Chemistry C 4, no. 26 (2016): 6224–29. http://dx.doi.org/10.1039/c6tc01647b.

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8

Sun, Jian, Shan Shan Gong, and Qi Sun. "A Novel Strategy for the Synthesis of Azetidine." Advanced Materials Research 830 (October 2013): 135–38. http://dx.doi.org/10.4028/www.scientific.net/amr.830.135.

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A novel method for the synthesis of azetidine via phosphoramidate intermediate has been developed. In the key step, cleavage of the PN bond in azetidin-1-ylphosporamidate with hydrochloric acid furnished a high-yielding conversion to azetidine hydrochloride.

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9

Li, Yu Feng, Xi Luo, and Lei Wang. "Preparation of Conductive Fine Flake Expanded Graphite/Polyaniline Composites." Advanced Materials Research 250-253 (May 2011): 910–13. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.910.

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Conductive fine flake expanded graphite/polyaniline composites was prepared by emulsion polymerization with sodium dodecyl benzene sulfonate(SDBS) as emulsifying agent, ammonium persulfate as initiator, hydrochloride and fine flakeexpanded graphite as dopants. Effects of hydrochloric acid, dopant, emulsifier and initiator to the conductivity has also been found through orthogonal experiment. The best condition, under which the conductivity is over 2.0S/cm, is 6% doped graphite, 6ml hydrochloric acid, 5.00g emulsifier and 3.25g initiator. It also demonstrates the improvement of the conductivity

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10

Shahmohammadi, Sayeh, Ferenc Fülöp та Enikő Forró. "Efficient Synthesis of New Fluorinated β-Amino Acid Enantiomers through Lipase-Catalyzed Hydrolysis". Molecules 25, № 24 (2020): 5990. http://dx.doi.org/10.3390/molecules25245990.

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An efficient and novel enzymatic method has been developed for the synthesis of β-fluorophenyl-substituted β-amino acid enantiomers through lipase PSIM (Burkholderia cepasia) catalyzed hydrolysis of racemic β-amino carboxylic ester hydrochloride salts 3a–e in iPr2O at 45 °C in the presence of Et3N and H2O. Adequate analytical methods were developed for the enantio-separation of racemic β-amino carboxylic ester hydrochlorides 3a–e and β-amino acids 2a–e. Preparative-scale resolutions furnished unreacted amino esters (R)-4a–e and product amino acids (S)-5a–e with excellent ee values (≥99%) and g

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11

Wang, Xiao Mei, and Yan Ming Zhang. "Study on One-Step Process of the Size Mixture Blending and Acidolysis Modification of Starch." Advanced Materials Research 821-822 (September 2013): 1122–25. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.1122.

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Taking cassava starch as the raw materials and hydrochloric acid (HCL) as the catalyst, the acidolysis modification of starch was performed combining with the size mixture blending process. The results show that when the concentration of cassava starch is in the range of 8%~12%, the dosage of 6% hydrochloride acid for 1000g starch milk is about 0.8g~1.2g, and the viscosity of acidolysis starch decreases with the increase of hydrochloric acid dosage. The viscosity can reach the stable level when the reaction time is about 2 hours for the size mixture of low viscosity, and is about 3 hours for t

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12

Kašpárková, Věra, Petr Humpolíček, Jaroslav Stejskal, et al. "Exploring the Critical Factors Limiting Polyaniline Biocompatibility." Polymers 11, no. 2 (2019): 362. http://dx.doi.org/10.3390/polym11020362.

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Today, the application of polyaniline in biomedicine is widely discussed. However, information about impurities released from polyaniline and about the cytotoxicity of its precursors aniline, aniline hydrochloride, and ammonium persulfate are scarce. Therefore, cytotoxicity thresholds for the individual precursors and their combinations were determined (MTT assay) and the type of cell death caused by exposition to the precursors was identified using flow-cytometry. Tests on fibroblasts revealed higher cytotoxicity of ammonium persulfate than aniline hydrochloride. Thanks to the synergic effect

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13

Savic, Ivana, Goran Nikolic, Ivan Savic, and Valentina Marinkovic. "Quantitative analysis of Loperamide hydrochloride in the presence its acid degradation products." Chemical Industry 63, no. 1 (2009): 39–46. http://dx.doi.org/10.2298/hemind0901039s.

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The aim of this work was to develop a new RP-HPLC method for the determination of loperamide hydrochloride in the presence of its acid degradation products. Separation of loperamide from degradation products was performed using ZORBAX Eclipse XDB C-18, column with a mobile phase consisting of 0.1% sodium-octansulphonate, 0.05% triethylamine, 0.1% ammonium hydroxide in water:acetonitrile (45:55 v/v). The mobile phase was adjusted to pH 3.2 with phosphoric acid. The method showed high sensitivity with good linearity over the concentration range of 10 to 100 ?g cm-3. The method was successfully a

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14

Fellows, Simon M., and Timothy J. Prior. "Crystal structure of 4-carbamoylpyridinium chloride." Acta Crystallographica Section E Crystallographic Communications 72, no. 4 (2016): 436–39. http://dx.doi.org/10.1107/s2056989016003340.

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The hydrochloride salt of isonicotinamide, C6H7N2O+·Cl−, has been synthesized from a dilute solution of hydrochloric acid in acetonitrile. The compound displays monoclinic symmetry (space groupC2/c) at 150 K, similar to the related hydrochloride salt of nicotinamide. The asymmetric unit contains one protonated isonicotinamide molecule and a chloride anion. An array of hydrogen-bonding interactions, including a peculiar bifurcated pyridinium–chloride interaction, results in linear chains running almost perpendicularly in the [150] and [1-50] directions within the structure. A description of the

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15

Yegorova, A., Yu Skrypynets, I. Leonenko, G. Maltsev, S. Kashutskуy, and O. Voitiuk. "Development and Validation of HPLC-MS Method of Determination of Memantine Hydrochloride for Study of Dissolution Profiles." Methods and Objects of Chemical Analysis 16, no. 2 (2021): 71–80. http://dx.doi.org/10.17721/moca.2021.71-80.

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A method for quantitative determination of memantine hydrochloride by HPLC with mass spectrometric detection (HPLC-MS), suitable for the study of dissolution profiles of tablets "Mematon IС" was developed. Chromatographic determination was performed using a mobile phase of methanol - 0.1% (v/v) aqueous solution of formic acid (55:45) on a column of Zorbax Eclipse Plus C18 size 10 cm Ч 4.6 mm (3.5 μm) at a flow rate of 1 ml/min. The linearity interval in the appropriate dissolution media is 35 - 150 % of the normalized content of memantine hydrochloride in the tablet. The method is validated on

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16

Du, Chao, and Ji Tai Li. "Synthesis of 1,5-Diaryl-1,4-pentadien-3-one Amidinohydrazone Hydrochloride Under Ultrasound Irradiation." E-Journal of Chemistry 9, no. 4 (2012): 2108–13. http://dx.doi.org/10.1155/2012/802408.

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Synthesis of 1,5-diaryl-1,4-pentadien-3-one amidinohydrazone hydrochlorideviathe condensation of 1,5-diaryl-1,4-pentadien-3-one and aminoguanidine hydrochloride catalyzed by hydrochloric acid was carried out in 80-94% yield at 35-37°C within 1.5 h under ultrasound irradiation. Compared to the classical method, the advantages of this method are milder conditions, shorter reaction time and higher yield.

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17

Amal H. Mhemeed. "Spectrophotometric method for the determination of benzocaine by cerium ammonium sulphate with promethazine hydrochloride in pure and phar-maceuticals preparation." International Journal of Research in Pharmaceutical Sciences 10, no. 2 (2019): 1420–23. http://dx.doi.org/10.26452/ijrps.v10i2.707.

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Easy, the accurate, sensitive spectrophotometric method used to determine Benzocaine in a pure and pharmaceutical preparation. The proposed method depends on using Promethazine hydrochloride as a reagent. Where it depends on oxidative coupling reaction of benzocaine by cerium ammonium sulphate with promethazine hydrochloride in the presence of hydrochloric acid to form green dye product, lmax 615 nm. Beers law is obeyed in the concentration of (5 –300 µg.ml-1). The molar absorptivity is (1.77 * 10 3) L.mol -1.cm-1, a sandal sensitivity of (0.0098) µq.cm-2 and RSD (± 0.56 %). The method gave a

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18

Revanasiddappa, H. D., and M. A. Veena. "A Sensitive Spectrophotometric Determination of Ritodrine, Pentazocine, Isoxsuprine Hydrochlorides and Amoxicillin in Pure and Pharmaceutical Samples." E-Journal of Chemistry 5, no. 1 (2008): 100–106. http://dx.doi.org/10.1155/2008/476326.

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A simple, accurate and highly sensitive spectrophotometric method for the determination of ritodrine hydrochloride (RTH), pentazocine hydrochloride (PZH), isoxsuprine hydrochloride (ISH) and amoxicillin (AMX) is described. The method is based on the oxidation of the studied drugs by a known excess of chloramine – T (CAT) in hydrochloric acid medium and subsequent determination of the unreacted oxidant by reacting it with iodide in the same acid medium liberates iodine, which subsequently react with starch to form a stable starch-iodine complex. The reacted oxidant corresponds to the drug conte

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19

Masrukan, Masrukan, and Umar Santoso. "PENGARUH KONSENTRASI ASAM KLORIDA DAN LAMA PERENDAMAN TERHADAP SIFAT FISIK DAN KIMIA GELATIN TULANG IKAN TUNA (Thunnus albacare)." AGROTECH : JURNAL ILMIAH TEKNOLOGI PERTANIAN 1, no. 1 (2019): 34–42. http://dx.doi.org/10.37631/agrotech.v1i1.6.

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Type A gelatin was extracted from partial hydrolysis of collagen from tuna fish bone. The experiment was conducted to determine the effect of hydrochloride acid solution and soaking time on physical and chemical properties of tuna fish bone gelatin and to determine optimum conditions for extraction of tuna fish bone gelatin which is based on the highest yield and gel strength. The experiment used randomized complete block design (RCBD) with two factors. The first factor was concentration of hydrochloric acid consisting of 3 level (1, 3, and 5% v/v) and the second factor was soaking time (24, 4

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20

Srinubabu, G., B. Sudha Rani, and J. V. L. N. Seshagiri Rao. "Spectrophotometric Determination of Ziprasidone in Pharmaceutical Formulations." E-Journal of Chemistry 3, no. 1 (2006): 9–12. http://dx.doi.org/10.1155/2006/643624.

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A simple and reproducible spectrophotometric method has been developed for the determination of Ziprasidone hydrochloride monohydrate (ZPS) in bulk and in dosage forms. The method is based on the extraction of the drugs into organic layer of the dye TPooo in presence of 0.1 N hydrochloric acid and the absorbances were measured at 490 nm. Results indicate that the proposed method was simple, sensitive, accurate and reproducible.

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21

Nigencovska, І. V., O. V. Burmaka, О. V. Manchenko, and К. E. Ziskind. "Determination ambroxole hydrochloride in substance ambroxole hydrochloride and finish medical products by methods adsorption spectroscopy in ultraviolet area, thin layer chromatography and height performers liquid chromatography." Farmatsevtychnyi zhurnal, no. 2 (May 7, 2020): 39–51. http://dx.doi.org/10.32352/0367-3057.2.20.04.

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The determination of the qualitative and quantitative content of the main active substance of a microlitic medicinal product is necessary to confirm its good quality. The purpose of scientific research: check the suitability of existing methods for the qualitative and quantitative determination of ambroxol hydrochloride, as indicated in the monographs of the SPU «Ambroxol hydrochloride, substance» and «Ambroxol tablets», for the possibility of qualitative and quantitative determination of ambroxol hydrochloride in various finished medicines and to determine the possibility of using an al

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22

Smrčková, Svatava, Kristina Juricová, and Viktor Prutianov. "Study of Amino-Imino Tautomerism in Derivatives of 2-, 4- and 6-Aminonicotinic Acid." Collection of Czechoslovak Chemical Communications 59, no. 9 (1994): 2057–68. http://dx.doi.org/10.1135/cccc19942057.

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13C NMR spectra of p-nitrobenzoyl 2-, 4-, and 6-aminopyridine-3-carboxylates, their hydrochlorides, trifluoroacetates and 1-benzyl derivatives were studied. As found from the chemical shifts of pyridine carbon atoms C-2, C-4 and C-6, the free bases exist in the amino form whereas hydrochlorides and 1-substituted pyridinium derivatives in the imino form. Trifluoroacetates of the 2- and 6-amino derivatives have structure similar to that of amidiniumcarboxylates (parallel hydrogen bonds and partially ionic character) whereas trifluoroacetate of the 4-amino derivative is structurally close to the

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23

Anpilogova, G. R., S. O. Bondareva, and Yu I. Murinov. "Gallium(III) Extraction from Hydrochloric Acid Solutions with Diacylated Diethylenetriamine Hydrochloride." Russian Journal of General Chemistry 88, no. 7 (2018): 1478–83. http://dx.doi.org/10.1134/s1070363218070204.

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24

Lu, Yan Hua, and Ming Su Song. "Effect of Chitosan Biguanidine Hydrochloride on Textile Properties of Antheraea Pernyi Silk." Advanced Materials Research 199-200 (February 2011): 1823–26. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1823.

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In order to improve the water-solubility of chitosan, chitosan biguanidine hydrochloride was synthesized by modified chitosan with dicyandiamide in the presence of hydrochloric acid. The guanidinylation chitosan was then applied to Antheraea pernyi (A. pernyi) silk fabric in the presence of 1,2,3,4-butane tetracarboxylic acid with sodium hypophosphite as catalyst. Studies on the effect of chitosan biguanidine hydrochloride treatment on morphology and textile properties of A. pernyi silk fiber and fabric have been conducted. The changes in the morphological structure have been monitored by scan

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25

Lawrance, GA, MA Oleary, BW Skelton, FH Woon, and AH White. "Reactions of (10-Methyl-10-nitro-1,4,8,12-tetraaza-cyclopentadecane)copper(II) Ion in Aqueous Hydrochloric Acid, Including Zinc Reduction. Crystal-Structure of (2-methyl-1,4,8,11-tetraaza-cyclotetradec-1-ene)copper(II) Perchlorate." Australian Journal of Chemistry 41, no. 10 (1988): 1533. http://dx.doi.org/10.1071/ch9881533.

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The zinc/aqueous hydrochloric acid reduction of (10-methyl-10-nitro-1,4,8,12-tetraaza-cyclopentadecane)copper(II) ion, [Cu{(3)}]2+, yields the hydrochloride salts of the expected 10-methyl-1,4,8,12-tetraazacyclopentadecan-10-amine (5) and also 14-amino-4,8,11-triazatetradecan-2-one (4) in approximately 2:1 ratio. Reaction of (10-methyl-10-nitro-1,4,8,12-tetraazacyclopentadecane)copper(II) ion in aqueous hydrochloric acid alone leads to bond scission and hydrolysis adjacent to the nitro-substituted carbon of the macrocycle to form 15- nitro-2,6,9,13-tetraazahexadecan-1-ol (7), which may be redu

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26

Yang, J. H., Y. Cui, G. X. Sun, Y. Nie, G. M. Xia, and G. X. Zheng. "Extraction of Sm(III)and Nd(III) with N,N,N’,N’-tetrabutyl-3-oxy-diglycolamidefrom hydrochloric acid." Journal of the Serbian Chemical Society 78, no. 1 (2013): 93–100. http://dx.doi.org/10.2298/jsc110922077y.

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The extraction behavior of Sm(III) and Nd(III) with N,N,N?,N?-tetrabutyl-3-oxa-diglycolamide (TBDGA) in 70% kerosene-30% n-octanol from hydrochloride acid wasstudied. The effect of hydrochloric acid concentration, extractant concentration,and temperature on the distribution of rare earth elementswas investigated. The extraction mechanism was established and the stoichiometry of the main extracted species was confirm to be SmCl3?2TBDGA and NdCl3?2TBDGA for Sm(III) and Nd(III), respectively. The extraction distribution ratio decreases with an increase in temperature, which demonstrates that the

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27

Frank, Walter, and Guido J. Reiß. "Spezielle Alkylammoniumhexachlorometallate, III [1] Synthese und Kristallstruktur von Tris(guanidinium)- hexachlororhodat(III)-monohydrat, [C(NH2)3]3 [RhCl6] · H2O / Alkylammonium Hexachlorometallates, III [1] Synthesis, and Crystal Structure of Tris(guanidinium) Hexachlororhodate(III) Monohydrate, [C(NH2)3]3[RhCl6] · H2O." Zeitschrift für Naturforschung B 51, no. 10 (1996): 1464–68. http://dx.doi.org/10.1515/znb-1996-1017.

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Tris(guanidinium) hexachlororhodate(III) monohydrate, [C(NH2)3]3[RhCl6] · H2O (1 ) has been obtained by the reaction of rhodium(III) chloride with guanidine hydrochloride in hydrochloric acid solution. 1 crystallizes in the triclinic space group P1̅ (a = 7.6013(9) Å, b = 8.6912(10) Å, c = 15.956(2) Å, α = 93.177(10)°, β = 101.691(10)°, γ = 113.995(9)°, V = 931.8(2), Z = 2). Two crystallographically independent hexachlororhodate ions, three crystallographically independent guanidinium ions and one water molecule are linked by a complex framework of hydrogen bonds.

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Said, Nurdin, Shahroom M. Shah Ahmad, V. Sivaguru Malar, A. Khairuddin Syafiqah, Athirah M. Sukri Hajar, and A. Rahman Aina. "Precious Nickel Recovery from Palm Oil Mill Fuel Ash Waste (Ni-POMFAW) Using Acidic Leaching Extraction (ALE)." Key Engineering Materials 705 (August 2016): 374–79. http://dx.doi.org/10.4028/www.scientific.net/kem.705.374.

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This paper demonstrates precious recovery of nickel from physical pre-treated raw palm oil mill fuel ash waste (POMFAW). The acidic leaching extraction (ALE) using sulphuric and hydrochloric acids agents were carried out in a bath stirrer flask. Process parameter effects of acid concentration, solution pH and treatment time were investigated in the nickel recuperation. The highest nickel recovery (96.83%) was found by treatment time of 1 h, pH of 2.5 and hydrochloric acid concentration of 2.0 M. At the acids leaching higher than 2 M, the nickel recovery decreased. Results from acids leaching i

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Pan, Jianyang, Luquan Zhang, Difeifei Xiong, Bailing Li, and Haibin Qu. "A HPLC-DAD-MS/MS Method for Simultaneous Determination of Six Active Ingredients of Salviae Miltiorrhizae and Ligustrazine Hydrochloride Injection in Rat Plasma and its Application to Pharmacokinetic Studies." Current Drug Metabolism 22, no. 1 (2021): 60–69. http://dx.doi.org/10.2174/1389200221999200819143230.

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Aims: This is a pharmacokinetic study of Salviae miltiorrhizae and ligustrazine hydrochloride injection. The study aimed to evaluate the mechanism of action, safety and rational clinical use of Salviae miltiorrhizae and ligustrazine hydrochloride injection. Background: Salviae miltiorrhizae and ligustrazine hydrochloride injection is a compound preparation consisted of Salvia miltiorrhiza extract and ligustrazine hydrochloride for the treatment of cardiovascular and cerebrovascular diseases in China. Objective: The study aimed to develop a rapid and sensitive high-performance liquid chromatogr

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Fu, Ren Chun, Jun Du, Hui Huang, and Zhong Cheng Guo. "The Electrical Conductivity Stability of Polyaniline Doped with Three Different Acids." Advanced Materials Research 774-776 (September 2013): 803–6. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.803.

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The doping acid will obviously effect on the properties of polyaniline. In order to investigate the industrial acids influence the electrical conductivity stability of polyaniline, the hydrochloric acid (HCl), sulfuric acid (SA) and methanesulfonic acid (MSA) in industrial degree were chosen as doping acids to synthesize polyaniline. The stability of electrical conductivity was measured by in situ temperature. The mechanism of temperature dependence of electrical conductivity was discussed. The results revealed that the stability of polyaniline doped by hydrochloric acid (HCl) was better than

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Chernykh, Vera N., Natalia A. Patrusheva, Inna N. Pugacheva, Nadezhda S. Nikulina, and Sergey S. Nikulin. "PROSPECTS FOR USE OF TRIETHANOLAMINE IN PRODUCTION OF SYNTHETIC RUB-BERS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 3 (2021): 100–106. http://dx.doi.org/10.6060/ivkkt.20216403.6303.

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The paper investigates the possibility of using SKS-30 ARK as a promising coagulant of triethanolamine and its salt in the technology of producing styrene-butadiene rubber. It was found that complete coagulation in the presence of triethanolamine occurs only at high consumption of its acidifying agent (sulfuric acid solution). Otherwise, complete coagulation is not observed. This is due to the fact that aqueous solutions of triethanolamine have an alkaline medium, and in this medium the aggregate stability of latex is greatest. It is noted that an increase in the consumption of triethanolamine

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Narola, Bhavil, A. S. Singh, P. Rita Santhakumar, and T. G. Chandrashekhar. "A Validated Stability-indicating Reverse Phase HPLC Assay Method for the Determination of Memantine Hydrochloride Drug Substance with UV-Detection Using Precolumn Derivatization Technique." Analytical Chemistry Insights 5 (January 2010): ACI.S3936. http://dx.doi.org/10.4137/aci.s3936.

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This present paper deals with the development and validation of a stability indicating high performance liquid chromatographic method for the quantitative determination of Memantine hydrochloride. Memantine hydrochloride was derivatized with 0.015 M 9-fluorenylmethyl chloroformate (FMOC) and 0.5 M borate buffer solution by keeping it at room temperature for about 20 minutes and the chromatographic separation achieved by injecting 10 μL of the derivatized mixture into a Waters HPLC system with photodiode array detector using a kromasil C18 column (150 × 4.6 mm), 5 μ, The mobile phase consisting

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Aghamaliyev, Z. Z., Mehriban V. Naghiyeva, and Ch K. Rasulov. "Synthesis of 2-Hydroxy-3-(Methylcyclohexenyl-Isopropyl)-5-Methylbenzylaminoethylnonyl Imidazolines - The Thermostabilizers to Polypropylene." Materials Science Forum 935 (October 2018): 155–59. http://dx.doi.org/10.4028/www.scientific.net/msf.935.155.

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2-hydroxy-3-(methylcyclohexenyl-isopropyl)-5-methylbenzylaminoethylnonylimidazolines were synthesized by the interaction of 2-(methylcyclohexynylisopropyl-4-methylphenols and aminoethylnonylimidazoline. Aminocompounds are purified from cycloalkylphenol by transferring them to hydrochloride salt. Further, aqueous solution of the hydrochloric acid amine salt is treated with a concentrated solution of NH4OH and free aminecompounds are isolated. The resulting amine is separated from water by benzene extraction. After benzene distillation, the residue is undergone to distillation under vacuum. Its

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Dagley, IJ, and JL Flippenanderson. "Synthesis of Cyclic Nitramines From Products of the Cyclocondensation Reaction of Guanidine With 2,3,5,6-Tetrahydroxypiperazine-1,4-dicarbaldehyde." Australian Journal of Chemistry 47, no. 11 (1994): 2033. http://dx.doi.org/10.1071/ch9942033.

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The reaction of 2,3,5,6-tetrahydroxypiperazine-1,4-dicarbaldehyde (1) with guanidine hydrochloride in hydrochloric acid can be controlled to give 2,6-diiminododecahydrodiimidazo[4,5-b:4′,5′-e] pyrazine (2a) or the cis isomer of 4,5-diamino-2-iminoimidazolidine (4). Compound (4) reacts with formaldehyde, or formic acid followed by reduction, to give 2-iminooctahydroimidazo[4,5-d] imidazole (7). Treatment of (2a) or (7) with nitric acid gives dinitro derivatives that were isolated as nitric acid salts of the cyclic guanidines. Reaction of the dinitro derivatives with nitric acid/acetic anhydride

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Monticelli, Damiano, Alessio Castelletti, Davide Civati, Sandro Recchia, and Carlo Dossi. "How to Efficiently Produce Ultrapure Acids." International Journal of Analytical Chemistry 2019 (January 1, 2019): 1–5. http://dx.doi.org/10.1155/2019/5180610.

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Subboiling distillation has been used since two decades for the purification of analytical grade acids from inorganic contaminants and demonstrated an efficient method to obtain pure acids starting from reagent grade chemicals. Nevertheless, the effect of the subboiling parameters on the purity of the distilled acids has never been methodically investigated. Aim of the present research is a systematic evaluation of the subboiling distillation protocol for the production of pure hydrochloric and nitric acid. In particular, the effect of the subboiling temperature and the number of subsequent di

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Xu, De Zeng, Ting Zhao, Zhi Chao Liu, Lu Nan Bai, and Jing Guo. "Study on Performances of Cyanethyl Chitosan Fiber Prepared from [Asp]Cl Ionic Liquid." Advanced Materials Research 581-582 (October 2012): 698–701. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.698.

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Aspartic acid hydrochloride ionic liquid ([Asp]Cl) was successfully synthesized from aspartic acid powder and 36% hydrochloric acid. The derivative of chitosan cyanoethyl chitosan was prepared by acrylonitrile and alkali chitosan at room temperature. Structures of ionic liquid and cyanoethyl chitosan were characterized by FT-IR. Crystalline properties of cyanoethyl chitosan were characterized by XRD. Cyanoethyl chitosan was dissolved in [Asp]Cl ionic liquid aqueous solution and subjected to wet spinning. The mechanical properties of cyanoethyl chitosan fibers were tested by type LLY-06 electro

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Sidun, Iurii, Serhiy Solodkyy, Oleksiy Vollis, Volodymyr Gunka, Roman Pyryk та Ihor Shits. "ОRTO-PHOSPHORIC ACID AS AN ALTERNATIVE TO HYDROCHLORIC ACID – FOR CATIONIC BITUMEN ROAD EMULSIONS. REVIEW". Theory and Building Practice 2020, № 1 (2020): 88–93. http://dx.doi.org/10.23939/jtbp2020.01.088.

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Shi, Pei Yang, Xiao Liang Li, Ying Ying Yue, Cheng Jun Liu, and Mao Fa Jiang. "Electrochemical Behavior of 430 Ferritic Stainless Steel in HCl Solution at Different Temperatures." Applied Mechanics and Materials 446-447 (November 2013): 394–97. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.394.

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The environmental concerns brought during pickling process of stainless steel in HNO3-containing acids need urgent attention. Choosing the hydrochloric acid pickling process as study object, this paper conducted a systematic study of the effect of temperature on the electrochemical behavior of stainless steel in hydrochloric acid solution. Research indicated that as temperature rose, the corrosion potential of 430SS in hydrochloric acid solution moved to positive direction with band to a narrow 0.1V. Meanwhile, the current intensity increased which indicated the acceleration of corrosion rate.

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Morantes, L. R., C. F. Medina, J. A. Henao, V. V. Kouznetsov, and H. A. Camargo. "Synthesis and X-ray diffraction data of 1-N-(3-pyridylmethyl)aminonaphthalene hydrochloride." Powder Diffraction 29, no. 2 (2014): 186–89. http://dx.doi.org/10.1017/s0885715614000049.

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The title compound 1-N-(3-pyridylmethyl)aminonaphthalene hydrochloride (C16H15N2Cl) was obtained by a reaction of α-naphthylamine (1) and N-pyridincarboxaldehyde (2) in anhydrous ethanol in the first step. The formed imine (3) was reduced with sodium borohydride in anhydrous methanol to give the product 1-N-(3-pyridylmethyl)aminonaphthalene (4). Finally, the hydrochloride was prepared by addition of a hydrochloric acid–ethyl acetate solution (ratio 1:3) with constant stirring and maintaining the temperature between 0 and 5 °C, obtaining a yellow polycrystalline solid corresponding to the respe

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Sfair, Letícia Lenz, Caren Gobetti, Martin Steppe, and Elfrides Schapoval. "Dissolution Test for Mianserin Hydrochloride in Tablets." Drug Analytical Research 3, no. 2 (2019): 18–22. http://dx.doi.org/10.22456/2527-2616.97029.

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A dissolution test for mianserin hydrochloride in coated tablets containing 30 mg was developed and validated using a fast ultraviolet spectrophotometric method. The appropriate conditions were determinate after testing sink conditions, agitation spped and dissolution medium. The sink conditions tested showed that mianserin hydrochloride was soluble in 0.01 and 0.1 M hydrochloric acid (HCl), acetate buffer pH 4.1 and 5.0 and phosphate buffer pH 6.8. Then, dissolution tests were performed to investigate the drug release in each medium. Optimal conditions to carry out the dissolution test were 9

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Lovering, Edward G., Normand Beaulieu, Robert C. Lawrence, and Roger W. Sears. "Liquid Chromatographic Method for Identity, Assay, and Content Uniformity of Five Tricyclic Drugs." Journal of AOAC INTERNATIONAL 68, no. 2 (1985): 168–71. http://dx.doi.org/10.1093/jaoac/68.2.168.

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Abstract A liquid chromatographic (LC) procedure has been developed for the assay, content uniformity, and identification of single active ingredient solid and liquid formulations of amitriptyline, chlorpromazine, imipramine, thioridazine, and trifluoperazine. The drugs are extracted from their formulations with methanol or dilute hydrochloric acid, and identified by comparison of retention times with those of known standards; drugs are quantitated against these standards with rf/-norephedrine hydrochloride as the internal standard. The precision of replicate injections is better than 2.5% for

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Liu, Tao, Nan Nan Xia, Xu Tang, and Gui Zhen Gong. "Degradation of Rice Straw with Dilute Hydrochloric Acid." Advanced Materials Research 1033-1034 (October 2014): 101–4. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.101.

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Rice straw was degraded with different concentration hydrochloric acid solution.The reaction mixture was extracted with petroleum ether and ethyl acetate, respectively. The effects of different concentration dilute hydrochloric acids on the yields of residue were investigated. The extracts were analyzed with gas chromatography (GC) and fourier transform infrared (FTIR) spectrometer. The results indicated that hydrochloric acid solution can convert most of the organic matters contained in rice straw into solvent-soluble species. The research is significance in the high value added utilization o

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Shafiq, Mian Umer, Aung Kyaw, and Muhannad Talib Shuker. "A Comprehensive Research to Find Suitable Acid for Sandstone Acidizing." Advanced Materials Research 787 (September 2013): 274–80. http://dx.doi.org/10.4028/www.scientific.net/amr.787.274.

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Stimulation of sandstone formations is a challenging task, which involves several chemicals and physical interactions of the acid with the formation. Some of these reactions may result in formation damage. Matrix acidizing may also be used to increase formation permeability in undamaged wells. Mud acid has been successfully used to stimulate sandstone reservoirs for a number of years. It is a mixture of hydrofluoric (HF) and hydrochloric (HCl) acids designed to dissolve clays and siliceous fines accumulated in the near-wellbore region. For any acidizing process, the selection of acid (Formulat

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Upadhyay, Anima, and M. Chandrakala. "C orrosion Studies on Tinned Iron Plates From Infant Food Cans." Material Science Research India 13, no. 2 (2016): 106–9. http://dx.doi.org/10.13005/msri/130207.

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The corrosion on smooth tinned iron material has been studied in different media. Solutions of sulphuric acid, hydrochloric acid, acetic acid and salt solutions of ammonium chloride and sodium chloride were prepared to investigate the corrosion on the metal plates. The plates was immersed in the solutions for a period of time same for all the solutions in order to determine the most aggressive environment. Weight loss technique was adopted to study the rate of corrosion. The result reveals that the material got corroded in this order sulphuric acid > hydrochloric acid > acetic acid >

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El Sayed, A. A., J. Haylor, and A. M. El Nahas. "Differential Effects of Amino Acids on the Isolated Perfused Rat Kidney." Clinical Science 79, no. 4 (1990): 381–86. http://dx.doi.org/10.1042/cs0790381.

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1. The direct effects of individual amino acids, including glycine (a neutral amino acid), l-glutamic acid (an acidic amino acid), l-leucine (a neutral, branched-chain amino acid) and l-arginine (a basic amino acid), on renal function were compared with a mixed amino acid solution by using the isolated rat kidney perfused with a physiological saline solution containing 6.7% (w/v) albumin and a basal level of 2 mmol/l mixed amino acids. 2. In a control series, the renal perfusate flow was stable but the glomerular filtration rate, as measured by [14C]inulin clearance, declined with time. A stab

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46

Villaverde, Juan José, Pablo Ligero, and Alberto de Vega. "Miscanthus x giganteus as a Source Of Biobased Products Through Organosolv Fractionation: A Mini Review." Open Agriculture Journal 4, no. 1 (2010): 102–10. http://dx.doi.org/10.2174/1874331501004010102.

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This paper deals with the chemical treatments with selected organic compounds that have been applied to Miscanthus to upgrade it, for pulp production or fractionation purposes. Organosolv processes have demonstrated their effectiveness as fractionation treatments; therefore special emphasis is placed on these systems and, in particular, those making use of carboxylic acids. That is, Acetosolv process that uses acetic acid-water-hydrochloric acid mixtures as delignifying agents, the process with formic acid-water-hydrochloric acid and the Milox process, which replaces the hydrochloric acid in t

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Cambie, RC, GR Clark, TC Jones, PS Rutledge, GA Strange та PD Woodgate. "vic-Iodo Thiocyanates and Iodo Isothiocyanates. IX. A Synthesis of Penam and Other Polycyclic Β-Lactams". Australian Journal of Chemistry 38, № 5 (1985): 745. http://dx.doi.org/10.1071/ch9850745.

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Penam (4-thia-1-azabicyclo[3.2.0]heptan-7-one) and 2,3-disubstituted penams are prepared conveniently from vic-iodo isothiocyanates beginning with the facile cyclization of the latter with di -t-butyl sodiomalonates. Treatment of the resulting di -t-butyl 2-(thiazolidin-2- ylene ) malonates with trifluoroacetic acid gives t-butyl 2-thiazolin-2- ylacetate derivatives which are reduced to the corresponding thiazolidines with aluminium amalgam. Cleavage of these t-butyl esters with hydrogen chloride affords β-amino acid hydrochlorides, which are cyclized to penam and its derivatives with 1-[3-( d

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&NA;. "Hydrochloric acid." Reactions Weekly &NA;, no. 1081 (2005): 14. http://dx.doi.org/10.2165/00128415-200510810-00043.

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De Backer, A., P. Haentjens, and G. Willems. "Hydrochloric acid." Digestive Diseases and Sciences 30, no. 9 (1985): 884–90. http://dx.doi.org/10.1007/bf01309520.

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50

Salomão, Priscila Maria Aranda, Daiana Moreli Soares Dos Santos, Camila Perfeito Evangelista Da Silva, Marília Afonso Rabelo Buzalaf, Annette Wiegand, and Ana Carolina Magalhães. "Erosive softening and erosive loss of enamel: Hardness and profilometry analysis." Brazilian Dental Science 19, no. 4 (2016): 83. http://dx.doi.org/10.14295/bds.2016.v19i4.1330.

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<p><strong>Objective –</strong> This study aimed to determine and differentiate erosive softening and enamel erosive loss induced by citric and hydrochloric acids. <strong>Material</strong> <strong>and</strong> <strong>Methods –</strong> Forty enamel specimens were divided into 2 groups: 1) 0.05 M citric acid (pH 2.5) simulating extrinsic erosion and 2) 0.01 M hydrochloric acid (pH 2.2) simulating intrinsic erosion. The enamel specimens were submitted to erosive challenges. Surface microhardness (softening) or contact profilometry (loss) wa

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