摘要:
The present invention provides a method for measuring the amount of free sulfurous acid and bound sulfurous acid in a sample using a bacterium belonging to Thiobacillus thiooxidans or Thiobacillus ferrooxidans of in which the sample is treated with acid and/or alkali to give free sulfurous acid alone in the sample. Then, the total amount of free sulfurous acid in the sample is measured by an oxidation reaction of free sulfurous acid to sulfuric acid using a bacterium belonging to Thiobacillus thiooxidans or Thiobacillus ferrooxidans.
摘要:
The present invention relates to a BOD analyzer comprising a microbe sensor containing an oxygen electrode and a microbe membrane. The microbe membrane is made by immobilizing microorganisms belonging to the genus Klebsiella in membrane. Specifically, the present invention relates to a BOD analyzer comprising flow cell equipped with a microbe sensor containing an oxygen electrode and a microbe membrane; and a liquid passage which is connected with the entrance of the flow cell and which is equipped with an outlet. The microbe membrane is made by immobilizing microorganisms belonging to Klebsiella oxytoca 12092 strain in a porous hydrophilic membrane having an average pore size of 0.65-3 .mu.m in diameter by using at least one gelating agent selected from the group consisting of alginic acid or salts thereof, agar, gellan gum, xanthane gum, gelatine, carageenan, locust bean gum, methylcellulose, pectin, and pullulan. The present invention also relates to improved methods of analyzing BOD by using the BOD analyzer.
摘要:
A novel foodstuff is produced by reacting a milk-coagulating enzyme which is produced by a milk-coagulating enzyme-producing microorganism belonging to genus Aspergillus, genus Mucor, or genus Rhizopus and which exhibits a milk-coagulating activity (A) and a protease activity (B) such that the ratio of (A)/(B) is larger than 0.1, with soymilk thereby inducing coagulation, and collecting a resulting coagulated material. The novel foodstuffs produced have the benefit of lacking the bitterness and astringency common to soybean, abounds in emulsifying activity, exhibit a high water-retention property, and are smoothly agreeable to the taste. Thus, they have extensive utility as substitutes for raw materials in conventional processed foods. They are especially suitable for use as raw materials for emulsifiable foods.
摘要:
A method and apparatus for producing vinegar by acetic acid fermentation utilizing an automatic alcohol analyzer for measurement of alcohol concentration in a fermenting broth, a feeding apparatus for feeding alcohol solution as raw material to the fermenting broth, and a control computer controllably coupled to the alcohol analyzer and to the feeding apparatus. The alcohol concentration in the fermenting broth is periodically measured by the automatic alcohol analyzer by a direction from the control computer at given intervals over a plurality of cycles of measurement; the control computer calculates a feed rate of alcohol solution as raw material to the fermenting broth so as to control the alcohol concentration in the fermenting broth at a desirable concentration on the basis of a difference between a measured alcohol concentration in the fermenting broth and a desirable alcohol concentration and the alcohol consumption rate calculated during each of the cycles by the control computer; and then the feeding apparatus is operated to control the feed rate of the alcohol solution responsive to a control signal generated by the control computer as a result of the aforementioned calculations, to thereby controllably feed alcohol solution as raw material to the fermenting broth.
摘要:
A method for measuring the alcohol concentration of an acetic acid fermentation broth which comprises (a) forming a sample gas containing volatile components present in the acetic acid fermentation broth, the volatile componentscomprising alcohol and acetic acid; (b) passing the sample gas through an absorption column packed with a material which binds acetic acid whereby the acetic acid is absorbed on the material; (c) passing the sample gas which has passed through the absorption column to a gas sensor for measuring the alcohol content of the gas by outputting an electrical signal which correlates to the alcohol content of the sample gas; and (d) determining the alcohol content of the sample gas in response to the electrical output signal from the gas sensor. The invention also provides a method of forming the sample gas by passing a sample of the fermentation broth through a water-repellent gas permeable tube mounted in a hollow cell and passing a carrier gas through the hollow cell whereby volatile components from the fermentation broth inside of the tube diffuse through the gas permeable tube wall and are intermixed with the carrier gas to form the sample gas containing the volatile components.
摘要:
Vinegar having an acetic acid concentration higher than 18 percent weight by volume is produced in a submerged fermentation by maintaining the temperature of the fermenting broth after the initiation of the fermentation at 27.degree.-32.degree. C. until the acetic concentration of the fermenting broth reaches 12-15 percent weight by volume and thereafter maintaining the temperature of the fermenting broth at 18.degree.-24.degree. C.