In this paper, the advances in research on theory and study technology of starch-lipid complex were summarized. The formation mechanism and structure, as well as the properties （crystal, gelatinization, viscoelastici...In this paper, the advances in research on theory and study technology of starch-lipid complex were summarized. The formation mechanism and structure, as well as the properties （crystal, gelatinization, viscoelasticity, retrogradation and digestion） of starch-lipid complex were introduced. In addition to development prospects, the application of starch-lipid complex in food, chemical and other fields were pointed out.展开更多
Silver-tin oxide powders were synthesized by the hydrothermal method with Ag(NH_3)_2^+ solution and Na_2SnO_3 solution as raw materials and Na_2SO_3 as reductant. The precipitation conditions of Na2SnO3 solution and t...Silver-tin oxide powders were synthesized by the hydrothermal method with Ag(NH_3)_2^+ solution and Na_2SnO_3 solution as raw materials and Na_2SO_3 as reductant. The precipitation conditions of Na2SnO3 solution and the reduction conditions of Ag(NH_3)_2^+ were also investigated. The powders prepared were characterized by differential thermal analysis (DTA), X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and energy spectrum analysis. The results show that pH value of the solution is a key parameter in the formation of Sn(OH)_4 precipitate and the reduction reaction of Ag(NH_3)_2^+ can release H+ ions, which results in synchronous precipitation of Sn(OH)_6~2- as Sn(OH)_4. The reduction of Ag(NH_3)_2^+ and precipitation of Na_2SnO_3 occur simultaneously and the coprecipitation of silver and tin oxide is reached by the hydrothermal method. The silver-tin oxide composite powders have mainly flake shape of about 0.3 μm in thickness and there exists homogeneous distribution of tin oxide and silver in the powder synthesized.展开更多
[Objective] The technology of using c-amylase and glucoamylase to prepare microporeus potato starch was studied.[ Method ] Taking potato starch as raw materials, starch hydrolysis rate and the oil absorption as a meas...[Objective] The technology of using c-amylase and glucoamylase to prepare microporeus potato starch was studied.[ Method ] Taking potato starch as raw materials, starch hydrolysis rate and the oil absorption as a measure of index, the influences of the reaction temperature, two enzymes proportion, the quantity of enzyme, the chroma of substrate, buffer solution pH and reaction time on microporous potato starch were inves- tigated. [ Result] The experimental results showed that the best technological conditions were reaction temperature 45 ℃, enzyme ratio （ glucoamy- lase/α-amylase）6, the quantity of enzyme （amount of enzyme and starch quality than） is 1.0%, the substrate quantity chroma of 0.14 g/ml, buffer solution pH 4, the reaction time 8 h. In such process condition, the oil adsorption rate of hydrolyzed potato starch was as high as 70.2%, starch hydrolytic ratio was 34.16%. [ Condmion] The study provided a basis for the development and utilization of microporous starch. Key words Microporous starch; Hydrolysis rate; Oil absorption rate; Preparation; Complex enzyme method; China展开更多
文摘In this paper, the advances in research on theory and study technology of starch-lipid complex were summarized. The formation mechanism and structure, as well as the properties （crystal, gelatinization, viscoelasticity, retrogradation and digestion） of starch-lipid complex were introduced. In addition to development prospects, the application of starch-lipid complex in food, chemical and other fields were pointed out.
基金Project(2001BA901A09)supported by the Key Program of Science and Technology Action of West China Development
文摘Silver-tin oxide powders were synthesized by the hydrothermal method with Ag(NH_3)_2^+ solution and Na_2SnO_3 solution as raw materials and Na_2SO_3 as reductant. The precipitation conditions of Na2SnO3 solution and the reduction conditions of Ag(NH_3)_2^+ were also investigated. The powders prepared were characterized by differential thermal analysis (DTA), X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and energy spectrum analysis. The results show that pH value of the solution is a key parameter in the formation of Sn(OH)_4 precipitate and the reduction reaction of Ag(NH_3)_2^+ can release H+ ions, which results in synchronous precipitation of Sn(OH)_6~2- as Sn(OH)_4. The reduction of Ag(NH_3)_2^+ and precipitation of Na_2SnO_3 occur simultaneously and the coprecipitation of silver and tin oxide is reached by the hydrothermal method. The silver-tin oxide composite powders have mainly flake shape of about 0.3 μm in thickness and there exists homogeneous distribution of tin oxide and silver in the powder synthesized.
文摘[Objective] The technology of using c-amylase and glucoamylase to prepare microporeus potato starch was studied.[ Method ] Taking potato starch as raw materials, starch hydrolysis rate and the oil absorption as a measure of index, the influences of the reaction temperature, two enzymes proportion, the quantity of enzyme, the chroma of substrate, buffer solution pH and reaction time on microporous potato starch were inves- tigated. [ Result] The experimental results showed that the best technological conditions were reaction temperature 45 ℃, enzyme ratio （ glucoamy- lase/α-amylase）6, the quantity of enzyme （amount of enzyme and starch quality than） is 1.0%, the substrate quantity chroma of 0.14 g/ml, buffer solution pH 4, the reaction time 8 h. In such process condition, the oil adsorption rate of hydrolyzed potato starch was as high as 70.2%, starch hydrolytic ratio was 34.16%. [ Condmion] The study provided a basis for the development and utilization of microporous starch. Key words Microporous starch; Hydrolysis rate; Oil absorption rate; Preparation; Complex enzyme method; China
