59results about How to "Wide range of pH adaptation" patented technology

The invention relates to a method for preenriching and separating lithium and boron from salt lake brine by liquid-liquid-liquid three-phase extraction, which comprises the following steps: adding water-soluble auxiliary extractant into a salt lake concentrated brine solution, regulating the pH value of the brine, adding water-soluble high molecular polymer, and thoroughly mixing at room temperature to obtain an upper / lower two-layer liquid-phase system; adding organic extractant, and mixing to obtain an upper / middle / lower three-layer liquid-phase system; and taking the upper and middle phases from the three-liquid-phase system, and respectively recovering lithium and boron in the upper and middle phases by back washing. The invention can simultaneously enrich and extract lithium and boron by one-step extraction from high-magnesium / lithium-ratio salt lake brine, and can separate the lithium and boron from abundant coexistent ions of magnesium, calcium and other impurity metals in the brine. The lithium and boron are respectively selectively enriched from the upper and middle phases in the three-liquid-phase system to implement primary separation, thereby facilitating the subsequent purification and refinement. The three-liquid-phase extraction can be carried out under neutral or weakly-acidic conditions, and has strong adaptability.

The invention discloses a glutamine transaminase mutant with improved enzymatic activity, which belongs to the field of enzyme engineering. The site-specific mutagenesis is performed on glutamine transaminase, an amino acid residue close to an active site of the glutamine transaminase is changed, so that the catalytic efficiency of the glutamine transaminase is improved, and the enzymatic activityof the glutamine transaminase is further improved. Recombinant yarrowia lipolytica with improved enzymatic activity is established by the glutamine transaminase mutant, the enzymatic activity of theglutamine transaminase is improved by 1.45 times compared with an original strain, the enzymatic activity of the shake flask fermentation can reach 16.995U / mL, and the enzymatic activity of the fermenting tank fermentation can reach 59.85U / mL which is the highest fermentation value reported at present.

A method for preparing an acid-modified light-burned magnesia / bentonite water treatment agent, which belongs to the preparation method of a water treatment agent. A certain amount of light-burned magnesia and bentonite are weighed according to a mass ratio of 1.5-2:1 (g / g), And add industrial hydrochloric acid with a mass fraction of 9% to light burnt magnesia and bentonite at a mass volume ratio of 1:1.2 (g / mL), mix and acidify at 450C-550C for 30 minutes, stand still for 30 minutes, and dry with microwave or high temperature Pulverization is the prepared acid-modified light-burned magnesium / bentonite water treatment agent product. The production raw materials are low-grade light-burned magnesium powder, calcium-based bentonite and low-concentration industrial hydrochloric acid; the preparation process is simple, no waste water and waste residue are produced, the production cost is low, and the environment is friendly; it integrates coagulation, adsorption, filtration and other functions. A new type of water treatment agent, which has a good pH adaptation range and removal effect on reactive dyes, heavy metals and other pollutants.

The invention relates to an anti-capsaicin substance general specific antibody, a test paper strip and a kitchen waste oil immunochromatographic rapid discriminating method. The anti-capsaicin substance general specific antibody is obtained through immunizing animals with a capsaicin substance general artificial immunization antigen compound represented by formula I, separating and purifying, and freeze-drying. The kitchen waste oil immunochromatographic immune test paper strip made from the anti-capsaicin substance general specific antibody can be used for rapidly detecting the total amount of capsaicin substances in kitchen waste oil, and has the advantages of high detection sensitivity, wide pH adaptation range, one-step operation, and high simplicity and convenience. No capsaicin substance standard solutions are used as positive control substances.