Microencapsulation research on the high content of DHA algal Oil

DHA全名二十二碳六烯酸(DocosahexaenicAcid)，属于多元不饱和脂肪酸，人体自身难以合成，具有极高的营养价值和优良的保健功能。但其结构和性质很不稳定，且不溶于水，从而使其在食品、保健品、医药等多个领域中的应用受到极大限制。本研究以DHA藻油为原料，制备高稳定性的DHA藻油微胶囊粉为目标，系统考察DHA藻油抗氧化剂、乳化剂、DHA藻油微胶囊壁材、乳化工艺及DHA藻油微胶囊粉的稳定性。为DHA藻油微胶囊粉的工业化生产奠定基础。 以过氧化值（POV）为指标，采用单因素和正交设计实验对抗氧化剂组合进行优化，获得最佳抗氧化剂组合：柠檬酸0.09%，异抗坏血酸钠0.04%，天然维生素E0...Docosahexaenic Acid (DHA) is polyunsaturated fatty acid with high nutritious value and excellent pharmaceutical function, the body cannot synthesize. But it is unstable and is difficult to dissolve in water. This extremely limits the utilizations of DHA in many fields such as food, health product, medicine processing. In this study, microcapsule was prepared by emulsification spray-drying using al...学位：工程硕士院系专业：化学化工学院_化学工程学号：X201019201

Study on Producing Porous Corn Starch

以玉米淀粉为原料,研究了玉米多孔淀粉制备过程中各种因素对产物成孔效果的影响,探讨了酶解成孔的机理,并对制备工艺进行了初步优化.在糖化酶和耐高温α-淀粉酶混合成的复合酶作用下,玉米淀粉水解制备玉米多孔淀粉的最佳工艺为:加酶量为按照理论水解55%淀粉的30倍加入量,糖化酶与耐高温α-淀粉酶的配比7∶1,反应体系pH值5.6,酶解温度60℃,淀粉浓度60%,反应时间20h.反应后玉米淀粉的吸油率由16.15%提高到了47.59%.This paper aims to have a discussion about the effect of the different conditions on the porosity of corn porous starch,and the possible mechanism.Optimal corn porous starch processing conditions are determined as follows: complex enzyme that could theoretically hydrolyze 30 times of 55% of the added raw starch;ratio of α-1,4-glucanglucohydrolase to α-amylase 7:1;pH 5.6;temperature 60℃;starch solid concentratio n(w/v) 60%;reation time 20h.The result shows that after the reaction the oil adsorption ratio of corn starch was increased from 16.15% to 47.59%

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies