ABSTRACT
Objective Laryngeal and upper esophageal foreign bodies are common diseases, we explored a new and simple method to remove these foreign bodies. Methods The clinical data of 177 patients with laryngeal and upper esophageal foreign bodies from June 2008 to January 2016 were analyzed retrospectively. We used two methods to treat these foreign bodies:130 foreign bodies were directly removed under video endoscopy;47 foreign bodies were removed with suspension laryngoscopy, and video endoscopy was used meanwhile. Result 177 laryngeal and upper esophageal foreign bodies were removed well, without severe complications like esophageal perforation or phyryngeal fistula. Conclusion Removing esophageal and laryngeal foreign bodies with video endoscopy is simple, safe and effective.
ABSTRACT
Quaternary ammonium glucosamine conjugatewas prepared by a two step procedure.First,condensation of glucosamine hydrochloride with chloro acetic chloride in the presence of potassium bicarbonate in aqueous medium at 0℃ provided the N chloroacetyl derivative in 74% yield.Subsequent reaction of this intermediate with pyridine at 40℃ for 3 days gave the pyridinium conjugate in 71% yield.The structures of compounds were confirmed by IR,NMR spectra and element analysis.
ABSTRACT
Basic aluminium 6 ? (carboxylmethyl) chitosan was prepared by reacting the solution of 6 ? (carb?xylmethyl) chitosan in water with basic aluminium chloride 〔Al(OH) 2Cl〕. The structure of product was confirmed by IR and atomic absoption spectroscopy.
ABSTRACT
A deep impact on the development of marine pharmaceutical science will be benefit- ed from the inter-disciplined combination of marine science and pharmaceutical science with information technology. Applications of such technologies as obtaining information trough Internet,database-on-the-Inter and virtual reality will greatly modify and accelerate the processes of discovering and developing marine drugs derived from marine bioresources. The concept of "virtual research on marine drug" was proposed for the first time in this paper, and the first professional net on marine drugs was build. The virtual research center for marine drugs was also build on the Internet and will be made more resourceful in the future.
ABSTRACT
Reaction of chitosan with glucose, galactose and lactose was performed in lactic acid MeOH to give corresponding schiff's base derivatives, the following reduction was carried out in the presence of sodium cyanoborohydride to prepare branched chain water soluble chitosan derivatives. The structure of derivatives were Confirmed by 1 HNMR and 13 CNMR.
ABSTRACT
N alkylated Partially deacetylated chitin(DAC 85)was prepared via reductive N alkylation in aceques MeOH with lauraldehyde.Further,O carboxymethlation of N alkylatedchitosan was performed in 55% NaOH with carboxymethy chloride.A new type amphiphilic chitosan derivative was achieved.Elementary analysis and IR spectrume was performed to study the characterization of the chitosan derivative.