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Pseudoephedrine

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https://www.readbyqxmd.com/read/29595846/%C3%AE-methyl-phenylglycines-by-asymmetric-%C3%AE-arylation-of-alanine-and-their-effect-on-the-conformational-preference-of-helical-aib-foldamers
#1
Romain Costil, Fernando Fernández-Nieto, Rachel C Atkinson, Jonathan Clayden
α-Arylated alanine derivatives were made enantioselectively by migratory rearrangement of a urea derivative using (R,R)-pseudoephedrine as a chiral auxiliary. Incorporation of a single residue of the product α-methyl phenylglycine into an otherwise achiral oligomer of aminoisobutyric acid oligomer induced a preferred screw sense, detectable by a NMR reporter located at the remote terminus of the oligomer. The magnitude of the screw sense induction was greater when the chiral residue was located at the N-terminus of the foldamer, and in some cases the sense of induction was opposite to that of related α-methylated amino acids with α-substituents other than aryl...
March 29, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29595579/prevention-of-otic-barotrauma-in-aviation-a-systematic-review
#2
Peter Ryan, Alexander Treble, Nirmal Patel, Nicholas Jufas
OBJECTIVE: To conduct a systematic review of the published evidence relating to the prevention of otic barotrauma in aviation. In particular, this review sought to identify procedures, techniques, devices, and medications for the prevention of otic barotrauma as well as evaluate the evidence relating to their efficacy. DATA SOURCES: Ten databases including Embase, MEDLINE, the Cochrane Database of Systematic Reviews, and the Cochrane Central Register of Controlled Trials were searched using the full historical range...
March 27, 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29578404/priapism-and-hemodialysis-case-report-and-literature-review
#3
Weiwen Vivian Shih, Cynthia Wong
BACKGROUND: Priapism is a known but rarely described complication of patients on dialysis. The incidence of priapism in the general population is estimated at 1.5 in 100,000 patients and 2.9 in 100,000 patients in males over 40 years of age; however there is little current literature describing priapism in adult dialysis patients and no current literature in pediatric dialysis patients [1]. We describe two pediatric patients who developed priapism concurrent with hemodialysis, each with differing severity and therapeutic management...
March 26, 2018: Clinical Nephrology
https://www.readbyqxmd.com/read/29542753/self-assembly-of-chiral-1r-2s-ephedrine-and-1s-2s-pseudoephedrine-into-low-dimensional-aluminophosphate-materials-driven-by-their-amphiphilic-nature
#4
Beatriz Bernardo-Maestro, Elisa Garrido-Martín, Fernando López-Arbeloa, Joaquín Pérez-Pariente, Luis Gómez-Hortigüela
In an attempt to promote the crystallization of chiral inorganic frameworks, we explore the ability of chiral (1R,2S)-ephedrine and its diastereoisomer (1S,2S)-pseudoephedrine to act as organic building blocks for the crystallization of hybrid organo-inorganic aluminophosphate frameworks in the presence of fluoride. These molecules were selected because of their particular molecular asymmetric structure, which enables a rich supramolecular chemistry and a potential chiral recognition phenomenon during crystallization...
March 15, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29493091/the-structure-identification-of-a-diphenhydramine-related-impurity-in-methamphetamine
#5
Cuimei Liu, Wei Jia, Yu Han, Zhendong Hua
Some methamphetamine (MA) crystals contain pharmaceutical impurities resulting from the co-ingredients of medicines used for extracting ephedrine/pseudoephedrine. These pharmaceutical impurities and their related byproducts can reflect the trends in precursor chemicals and manufacturing sources. In this research, one pharmaceutical impurity related byproduct was detected in several seized MA samples synthesized by I/P (Nagai, Moscow, or Hypo) method. Its structure was postulated through the analysis of fragment ions in EI mass spectrum...
March 1, 2018: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29459189/detailed-investigations-into-the-akabori-momotani-reaction-for-the-synthesis-of-amphetamine-type-stimulants-part-2
#6
David Doughty, Emma Kent, Ben Painter, Paul E Pigou, Martin R Johnston
The Akabori-Momotani reaction can be used to synthesise pseudoephedrine in 50% yield from N-methylalanine and benzaldehyde. This paper investigates electronic effects of substituted benzaldehydes on the reaction to synthesise amphetamine type stimulants and identifies several new Akabori-Momotani by-products, 1-[(4-methoxybenzyl)(methyl)amino]ethanol (11c), 2-(4-methoxyphenyl)-3,4-dimethyl-1,3-oxazolidine (12c), 1,2,3,4-tetramethyl-5,6-di-(4-methoxyphenyl)piperazine (13c) and 1,2,4,5-tetramethyl-3,6-di-(4-methoxyphenyl)piperazine (14c)...
February 6, 2018: Forensic Science International
https://www.readbyqxmd.com/read/29367131/stereochemistry-of-ephedrine-and-its-environmental-significance-exposure-and-effects-directed-approach
#7
Jack Rice, Kathryn Proctor, Luigi Lopardo, Sian Evans, Barbara Kasprzyk-Hordern
Analysis of drugs and pharmaceuticals in the environment is typically performed with non-chiral chromatographic techniques. The environmental risks posed by chiral compounds analysed in this way must therefore be assumed to be independent of chirality, meaning that each enantiomer is equally potent in toxicity and long-lived in stability. This manuscript examines the degradation of each of the four isomers of ephedrine in river simulating microcosms and links this to toxicity data obtained by exposing three different organisms (D...
January 11, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29331797/application-of-polyacrylamide-gel-as-a-new-membrane-in-electromembrane-extraction-for-the-quantification-of-basic-drugs-in-breast-milk-and-wastewater-samples
#8
Sakine Asadi, Hadi Tabani, Saeed Nojavan
Introducing new membranes with green chemistry approach seems to be a great challenge for the development of a practical method in separation science. In this regard, for the first time, polyacrylamide gel as a new membrane in electromembrane extraction (EME) was used for the extraction of three model basic drugs (pseudoephedrine (PSE), lidocaine (LID), and propranolol (PRO)), followed by HPLC-UV. In comparison with conventional EME, in this method neither organic solvent nor carrier agents were used for extraction of mentioned drugs...
March 20, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29233397/assessment-of-student-pharmacists-ethical-decision-making
#9
Jaclyn R Myers, Mary E Kiersma, Kimberly S Plake
INTRODUCTION: In previous research, investigators have expressed concern about the ethical ambivalence of pharmacists in decision-making. The objectives of this study were to examine student pharmacists': 1) attitudes and responses regarding specific common ethical situations and 2) perceived level of difficulty in making ethical decisions. METHODS: A self-administered 38-item survey was given to second and third year student pharmacists at Purdue University. The survey comprised five sections, including: 1) attitudes towards common ethical situations, 2) responses to specific ethical scenarios, 3) emergency lending, 4) perceived level of difficulty in resolving ethical dilemmas, and 5) demographics...
November 2017: Currents in Pharmacy Teaching & Learning
https://www.readbyqxmd.com/read/29193073/carbon-and-nitrogen-stable-isotope-analyses-of-ephedra-plant-and-ephedrine-samples-and-their-application-for-methamphetamine-profiling
#10
Cuimei Liu, Peipei Liu, Wei Jia, Yingfeng Fan
In this study, stable isotope ratio analysis was used to track the precursor information of methamphetamine. The δ13 C and δ15 N values of 30 nature ephedra plants, 12 synthetic ephedrine/pseudoephedrine (ephedrine), 14 natural ephedrine, and 987 seized methamphetamine samples were measured and compared. Due to different weather and earth conditions, the δ13 C and δ15 N values of ephedra plants grown in the east and the west of Inner Mongolia showed great difference. The δ15 N values of ephedra plants were consistent with related ephedrine extracted from them...
November 28, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/29127905/dissolution-studies-of-metamizole-sodium-and-pseudoephedrine-sulphate-dosage-forms-comparison-and-correlation-of-electronic-tongue-results-with-reference-studies
#11
Małgorzata Wesoły, Marcin Zabadaj, Krzysztof Cal, Patrycja Ciosek-Skibińska, Wojciech Wróblewski
This work reports a critical evaluation of the results of the release of active substances (APIs) from novel pharmaceutical formulations provided by an electronic tongue system (ET). Detailed dissolution studies of modified-release granules used in pharmacotherapy containing metamizole sodium and pseudoephedrine sulphate were carried out. The impact of the dissolution-modifying excipients (carmellose sodium and hypromellose) on the dissolution process as well as on the outcomes of the sensor array of ion-selective electrodes was investigated...
February 5, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29059613/capillary-electrophoresis-separation-of-phenethylamine-enantiomers-using-amino-acid-based-ionic-liquids
#12
Joachim Wahl, Ulrike Holzgrabe
In recent years increasing interest was drawn towards ionic liquids in analytical separation science, such as capillary electrophoresis. Ionic liquids combining tetrabutylammonium cations with chiral amino acid based anions were prepared and investigated as capillary electrophoresis background electrolyte additives for the enantioseparation of ephedrine, pseudoephedrine, and methylephedrine isomers. For the optimization of buffer pH and ionic liquid concentration a design of experiments approach was performed...
October 17, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28994520/-establish-quality-evaluation-system-for-standard-ephedrae-herba-decoction
#13
Jia-Yu Tong, Jung Chao, Yun-Tao Dai, Zi-Quan Fan, Dan-Dan Wang, Xue-Mei Qin, Shi-Lin Chen
To establish the quality control methods for the standard decoction of Ephedrae Herba, and provide the reference for quality evaluation method of all Chinese herbal medicine decoction.Standard decoction of Ephedrae Herba was prepared, and UPLC-UV fingerprint was established to determine the total contents of ephedrine and pseudoephedrine. Then UPLC-QTOF/MS was used to confirm the major common peaks in the fingerprint to clarify the main chemical constituents in the decoction. In addition, the stability of the process was evaluated by calculating the parameters such as the extraction ratio, transfer rate of the index components and the pH values...
March 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28873376/efficacy-and-safety-of-cathine-nor-pseudoephedrine-in-the-treatment-of-obesity-a-randomized-dose-finding-study
#14
RANDOMIZED CONTROLLED TRIAL
Hans Hauner, Ljiljana Hastreiter, Dieter Werdier, Annette Chen-Stute, Jürgen Scholze, Matthias Blüher
OBJECTIVE: To investigate the efficacy and safety of increasing doses of cathine (nor-pseudoephedrine) as a weight-lowering agent in patients with obesity. METHODS: Overweight and obese patients (n = 241, mean BMI 34.6 ± 3.4 kg/m²) were randomly allocated to one of three doses of cathine (16 mg, 32 mg, 53.3 mg) or placebo in addition to a multimodal lifestyle intervention program in a multicenter, double-blind, controlled, dose-finding study for 24 weeks. Primary outcome was weight loss...
2017: Obesity Facts
https://www.readbyqxmd.com/read/28851653/investigation-on-temperature-induce-conformational-change-of-immobilized-%C3%AE-2-adrenergic-receptor
#15
Xiaokang Gao, Lingjian Yang, Qian Li, Yuxin An, Sha Liao, Haiyang Gao, Xinfeng Zhao, Liujiao Bian, Xiaohui Zheng
The β2 adrenergic receptor (β2 -AR) is a prototypical family A G protein-coupled receptor (GPCR) and an excellent model system for studying the mechanism of GPCR activation. Purified β2 -AR was immobilized on macroporous silica gel to obtain liquid chromatographic stationary phase. The resulting phase was packed into a stainless steel column (4.6 × 50 mm, 7 μm) and used for on-line chromatographic system. When column oven temperature increased from 20.0 °C to 40.0 °C, uncomplete separate chromatographic peaks of ephedrine and pseudoephedrine as receptor conformational probe were gradually merged into one peak, meanwhile retention time and resolution of the probes were reduced correspondingly, which suggested that temperature could regulate protein conformation...
December 16, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28842339/gangjihwan-a-polyherbal-composition-inhibits-fat-accumulation-through-the-modulation-of-lipogenic-transcription-factors-srebp1c-ppar%C3%AE-and-c-ebp%C3%AE
#16
Jaewoong Jang, Yoonju Jung, Seyeon Chae, Soo Hyun Cho, Michung Yoon, Heejung Yang, Soon Shik Shin, Yoosik Yoon
ETHNOPHARMACOLOGICAL RELEVANCE: Gangjihwan (DF) which is composed of Ephedra intermedia, Lithospermum erythrorhizon, and Rheum palmatum has been used for the treatment of obesity in traditional medical clinics in Korea. AIM OF THE STUDY: This study was conducted to standardize DF and elucidate its mechanism of action for inhibiting fat accumulation in adipocytes and adipose tissues. MATERIALS AND METHODS: The herbal ingredients of DF were extracted in water, 30% ethanol or 70% ethanol and freeze-dried followed by HPLC analyses...
August 24, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28761581/extended-release-guaifenesin-pseudoephedrine-hydrochloride-for-symptom-relief-in-support-of-a-wait-and-see-approach-for-the-treatment-of-acute-upper-respiratory-tract-infections-a-randomized-double-blind-placebo-controlled-study
#17
Edward J Septimus, Helmut H Albrecht, Gail Solomon, Tim Shea, Eric P Guenin
BACKGROUND: Despite the well-known fact that antibiotics (AB) are not effective against viruses, many patients ask for - and all too often doctors provide - AB for treating URTIs. Over-prescribing of AB is one of the key causes for the development of bacterial resistance, which the U.S. Centers for Disease Control and Prevention (CDC) calls "one of the world's most pressing public health problems". In addition to the CDC initiated "Get Smart About Antibiotics" campaign, focused on educating doctors the public about the importance of appropriate AB use, other programs tackling this problem include the development of new treatment paradigms...
2017: Current Therapeutic Research, Clinical and Experimental
https://www.readbyqxmd.com/read/28717105/ephedrine-induced-mitophagy-via-oxidative-stress-in-human-hepatic-stellate-cells
#18
Ah Young Lee, Yoonjeong Jang, Seong-Ho Hong, Seung-Hee Chang, Sungjin Park, Sanghwa Kim, Kyung-Sun Kang, Ji-Eun Kim, Myung-Haing Cho
The herb Ephedra sinica (also known as Chinese ephedra or Ma Huang), used in traditional Chinese medicine, contains alkaloids identical to ephedrine and pseudoephedrine as its principal active constituents. Recent studies have reported that ephedrine has various side effects in the cardiovascular and nervous systems. In addition, herbal Ephedra, a plant containing many pharmacologically active alkaloids, principally ephedrine, has been reported to cause acute hepatitis. Many studies reported clinical cases, however, the cellular mechanism of liver toxicity by ephedrine remains unknown...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28706557/comparative-pharmacokinetics-and-bioavailability-of-three-ephedrines-in-rat-after-oral-administration-of-unprocessed-and-honey-fried-ephedra-extract-by-response-surface-experimental-design
#19
Yezhe Cheng, Yu Zhang, Hang Xing, Kun Qian, Longshan Zhao, Xiaohui Chen
Ephedra have been used as a common traditional Chinese medicine for thousands of years. However, the perspiration effect of the unprocessed ephedra was too strong. Clinical trials have shown that processing methods play a critical role in moderating the perspiration property of ephedra according to the needs. A LC-MS/MS method was developed and validated to compare the pharmacokinetic properties of the three ephedrines after oral administration of unprocessed and honey-fried ephedra extract. The contents of honey, frying temperature, and frying time were set at 20%, 116°C, and 7 min by the Box-Behnken response surface method, respectively...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28703347/non-pigmenting-fixed-drug-eruption-with-mixed-features-of-acute-generalized-exanthematous-pustulosis-induced-by-pseudoephedrine-a-case-report
#20
Risa Fukuda, Takeshi Ouchi, Ikuko Hirai, Takeru Funakoshi, Aki Honda, Keiji Tanese, Akiko Tanikawa, Masayuki Amagai, Hayato Takahashi
No abstract text is available yet for this article.
August 2017: Contact Dermatitis
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