Topic
Sodium sulfite
About: Sodium sulfite is a research topic. Over the lifetime, 2548 publications have been published within this topic receiving 18523 citations. The topic is also known as: Na2SO3 & Anhydrous sodium sulfite.
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TL;DR: In this paper, a mechanistic study suggested that the formation of an amidogen radical (NH 2 ) during NH 2 Cl decomposition with Fe(II) led to the reduction of the activation energy for the chlorination reaction to proceed.
95 citations
TL;DR: Alkaline hydrolysis of peptides is carried out prior to detection to increase the sensitivity of the method and is convenient for the manual determination of 5 to 100 nmol of amino acids in the 50–100 samples required to define a chromatographic elution profile.
93 citations
TL;DR: To determine the oxygen-transfer capacities of small-scale bioreactors such as shaking flasks, test tubes, and microtiter plates, a noninvasive easy-to-use optical method based on sulfite oxidation has been developed.
Abstract: The growth of microorganisms may be limited by operating conditions which provide an inadequate supply of oxygen. To determine the oxygen-transfer capacities of small-scale bioreactors such as shaking flasks, test tubes, and microtiter plates, a noninvasive easy-to-use optical method based on sulfite oxidation has been developed. The model system of sodium sulfite was first optimized in shaking-flask experiments for this special application. The reaction conditions (pH, buffer, and catalyst concentration) were adjusted to obtain a constant oxygen transfer rate for the whole period of the sulfite oxidation reaction. The sharp decrease of the pH at the end of the oxidation, which is typical for this reaction, is visualized by adding a pH dye and used to measure the length of the reaction period. The oxygen-transfer capacity can then be calculated by the oxygen consumed during the complete stoichiometric transformation of sodium sulfite and the visually determined reaction time. The suitability of this optical measuring method for the determination of oxygen-transfer capacities in small-scale bioreactors was confirmed with an independent physical method applying an oxygen electrode. The correlation factor for the maximum oxygen-transfer capacity between the chemical model system and a culture of Pseudomonas putida CA-3 was determined in shaking flasks. The newly developed optical measuring method was finally used for the determination of oxygen-transfer capacities of different types of transparent small-scale bioreactors.
91 citations
Patent•
02 Mar 1999Abstract: A swellable hydrophilic matrix tablet that delivers drugs in a controlled manner over a long period of time and is easy to manufacture. More specifically, the drug is disposed in a matrix composed of HPMC or polyethylene oxide, in the presence of a salt, which may be a combination of salts. Suitable salts include sodium bicarbonate, sodium chloride, potassium bicarbonate, calcium chloride, sodium bisulfate, sodium sulfite, and magnesium sulfate. Outward diffusion of the drug is controlled by an inwardly progressing hardening reaction between the salt and the dissolution medium, possibly also involving the drug itself.
88 citations
TL;DR: Sodium sulfite was used to improve the separation of copper-activated sphalerite from pyrite in mildly alkaline pH conditions as discussed by the authors, which was mainly the result of the much larger depression of the flotation of pyrites than sphalersite, and was obtained by conditioning the minerals with oxygen and decreasing the time interval between sulfite and xanthate additions.
87 citations