3 results about "Dialdehyde starch" patented technology

The application relates to the technical field of drug carrier materials, in particular to a starch-based capsule and a preparation method thereof, which comprises the following steps: S1, after dialdehyde starch is gelatinized, the dialdehyde starch is mixed with a tannic acid solution, an iron chloride solution is added, uniform mixing and defoaming are carried out, and a film-forming solution is obtained; S2, a mold is immersed in the film-forming solution, preliminary drying is carried out under a set temperature and humidity condition after pulling up, and a gel film layer is formed; S3, the gel film layer after preliminary drying is demolded, humidity balance and drying are sequentially carried out, and the starch-based capsule is obtained. By adding tannic acid and a suitable amount of iron chloride, an effective crosslinking network structure is formed among starch molecules, the mechanical strength of the capsule shell is enhanced, and the hygroscopicity is reduced.

The application discloses a modified starch-based petroleum drilling aid and a preparation method thereof, and comprises the following steps: S1, oxidizing dialdehyde starch into polycarboxyl starch by using sodium chlorite; S2, performing esterification treatment on the polycarboxyl starch, and then performing amidation reaction on the polycarboxyl starch and sodium p-aminobenzenesulfonate; S3, performing reduction treatment on the amide bond by using a reducing agent; and S4, performing lipolysis on the starch after the reduction treatment to obtain the modified starch. The modified starch prepared by the application can greatly improve the temperature resistance and salt resistance by grafting a large number of rigid benzene rings and hydration groups, and has excellent effects of increasing viscosity, improving cutting and reducing filtration loss.

This invention discloses a FeCDs-based dual-mode fluorescent probe, its preparation method, and its applications, belonging to the field of chemical synthesis and analytical technology. The probe exhibits a "fluorescence transition-new peak appearance" response to L-ascorbic acid and a "simple fluorescence quenching" response to D-ascorbic acid. It is prepared via hydrothermal synthesis of dialdehyde starch, 1,2-diaminonaphthalene, and FeCl3. During detection, the fluorescence color change is observed under a 365 nm UV lamp for visual detection, or excitation is performed at 360 nm, with L-AA exhibiting an Ig... 430 / I 610 Ratio quantification, D-AA with I 610 Intensity-based quantification enables quantitative detection. Detection limits are 0.028 μmol / L and 0.033 μmol / L, respectively, allowing for rapid qualitative differentiation and highly sensitive quantitative detection of chiral ascorbic acid.