超临界二氧化碳萃取蛋黄油的研究

采用超临界流体CO2从蛋黄粉提取蛋黄油。研究了超临界CO2萃取过程的试验参数,从萃取的压力、温度以及原料的产地等参数对萃取的影响,确定了最佳工艺条件。     

原料状况及超临界二氧化碳流体萃取操作条件对当归油萃取率的影响研究

运用超临界流体萃取技术提取当归油 ,综合考察了原料状况 (粒度、水分 )和萃取釜条件 (温度、压力、萃取釜中原料加入量、是否放置填料、填料位置以及SC -CO2 流量 )对当归油萃取率的影响 ,得到较好的超临界流体萃取当归油的条件为 :1L萃取釜装料量 2 5 0 g ,压力 18- 2 0MPa ,温度 4 0℃ ,釜底放置填料 ,时间为 ( 2 - 2 .5 )hr ,原料粒度 ( 4 0 - 6 0 )目 ,含水量 ( 5 .87- 8.7) % ,SC -CO2 流量Q =( 5 - 15 )kg/hr。当归油萃取率可大于 2 .5 7%。     

超临界流体CO2萃取南瓜籽油的初步研究

以超临界流体CO2萃取技术对南瓜籽中的油脂提取进行了初步研究.研究了不同物料粒度、萃取压力、萃取温度、萃取时间及CO2流量对南瓜籽油萃取率的影响.     

超临界CO2流体从紫菜中萃取EPA和DHA的研究

采用超临界CO2 流体萃取技术从紫菜中萃取EPA和DHA ,研究了紫菜粉碎粒度、萃取温度、萃取压力和萃取时间对萃取率的影响。结果表明 :超临界CO2 流体从紫菜中萃取EPA和DHA的工艺可行 ,最佳的萃取条件为 :紫菜粉碎粒度为 2 0～ 80目 ,萃取温度 3 5℃ ,萃取压力 2 5MPa ,萃取时间 1 .5h。     

枸杞籽油超临界二氧化碳萃取方法的实验研究

建立了一套超临界流体萃取枸杞籽油实验流程．以CO2为萃取剂,考察了萃取压力、操作温度、CO2流量及原料颗粒度等因素对枸杞籽油萃取率的影响,确定了较佳的萃取工艺条件：压力30MPa,温度313-318K,枸杞籽颗粒40-50目,CO2流量0．3—0．4m^3/h时枸杞籽油萃取率最高,可达155％.     

超临界CO2萃取制备卵黄磷脂

采用超临界CO2萃取蛋黄粉中的蛋黄油及用食用酒精萃取卵磷脂，在较温和的工艺条件下制备卵黄磷脂。     

超临界二氧化碳萃取亚麻籽油的研究

采用半连续流程 ,以亚麻籽为原料、超临界CO2 为溶剂萃取亚麻籽油。通过对不同操作压力、温度、时间、CO2 流量条件下萃取曲线平衡段的直线拟和得到亚麻籽油在超临界CO2 中的溶解度 ,并回归了Chrastil方程的参数 ,得到计算亚麻籽油在超临界CO2 中的溶解度的方程。将萃取过程考虑为CO2 通过亚麻籽固定床的模型 ,由Stastova提出的传质方程对不同压力、温度、CO2 流量下的萃取过程进行模拟 ,并分析了传质系数在不同操作条件下的变化     

超临界CO2萃取技术及其萃取的蛋黄油在抗皱霜中的应用

超临界CO2萃取技术是目前在食品、日化行业新兴的提取方法，它具有不破坏萃取物成分、产品纯度高的优点，用SC—CO2萃取所得蛋黄油加入抗衰霜中，提高了抗衰有效率。     

姜酚超临界流体萃取-精馏技术

采用超临界流体萃取-精馏技术从生姜中提取姜酚。考察了萃取压力、萃取温度、萃取时间、CO2流速、原料粒度等因素对姜酚纯度和萃取率的影响。确定的最佳条件为萃取压力25MPa,萃取温度50℃,CO2流量20L/h,萃取时间2 5h,原料粒度40～60目。获得的提取物中姜酚的质量分数≥96 2%,萃取率≥1 38%。     

超临界CO2流体萃取莪术挥发油的工艺研究

利用超临界CO2流体萃取技术,以榄香烯为目标物,研究了萃取压力、温度、时间、原料粒度和CO2流量对莪术挥发油萃取率的影响,建立了获得莪术挥发油的最佳工艺条件.实验结果表明,莪术粉粒度40目,萃取压力18 MPa,温度50℃,萃取时间120 min,流量20～30 kg/h条件下,挥发油中榄香烯含量最高,相对含量为2.8%,为以后精馏研究奠定了基础.     

Mathematical modeling of extraction of egg yolk oil with supercritical CO2

Extraction of egg yolk oil (EYO) from egg yolk powder (EYP) with supercritical CO₂ was performed on a laboratory apparatus. Solubility of EYO in supercritical CO₂ was measured. The external diffusion and the equilibrium between solid and fluid phases were experimentally found to be the controlling steps during the extraction process. Based on this mechanism, a mathematical model for this extraction process was developed. The model parameters, adsorption equilibrium constant (k_p), EYO concentration in solid controlling the transition in the equilibrium (x_k) and the overall volumetric mass transfer coefficient (K_fa_p), were obtained by simulation. The simulation results indicated that x_k is 0.56, K_fa_p is directly proportional to CO₂ flow rate with an exponent of 0.548, and the adsorption heat of EYO is 6–9 kJ mol⁻¹. The model was verified by concentration profiles of solid. The extraction process of EYO with supercritical CO₂ was conducted on a pilot plant and the developed model could predict satisfactorily the process.     

Supercritical Carbon Dioxide Extraction of the Oak Silkworm (Antheraea pernyi) Pupal Oil: Process Optimization and Composition Determination

Supercritical carbon dioxide (SC-CO(2)) extraction of oil from oak silkworm pupae was performed in the present research. Response surface methodology (RSM) was applied to optimize the parameters of SC-CO(2) extraction, including extraction pressure, temperature, time and CO(2) flow rate on the yield of oak silkworm pupal oil (OSPO). The optimal extraction condition for oil yield within the experimental range of the variables researched was at 28.03 MPa, 1.83 h, 35.31 °C and 20.26 L/h as flow rate of CO(2). Under this condition, the oil yield was predicted to be 26.18%. The oak silkworm pupal oil contains eight fatty acids, and is rich in unsaturated fatty acids and α-linolenic acid (ALA), accounting for 77.29% and 34.27% in the total oil respectively.     

超临界二氧化碳萃取蛋黄油实验研究

介绍了超临界二氧化碳萃取技术提取蛋黄洫的工作原理及工艺流程。设计了正交实验.考察萃取压力、萃取温度、萃取时间等参数对萃取率的影响,确定了最佳工艺条件。     

超临界二氧化碳萃取蛋黄油实验研究

介绍超临界二氧化碳萃取技术提取蛋黄油的工作原理及工艺流程.设计了正交实验,考察了萃取压力、萃取温度、萃取时间等参数对萃取率的影响,确定了最佧工艺条件.     

响应曲面法优化超临界CO_2萃取猕猴桃籽油条件

以猕猴桃籽为试验原料,在单因素试验的基础上,采用响应曲面分析法建立了超临界CO2萃取猕猴桃籽油萃取率的二次多元回归方程,探讨了压力、温度、CO2流量等关键因素对萃取率的作用规律。结果表明,萃取压力、温度、CO2流量对萃取率影响显著,萃取压力和温度交互效应影响显著。根据萃取率回归方程对猕猴桃籽油的超临界萃取工艺参数进行了优选,最优工艺参数为:压力31.7 MPa,温度40.2℃,CO2流量27.4 kg/h,该条件下萃取率高达32.57%,与试验值31.24%仅有4.5%的误差,证实了该方程的预测值与试验值之间具有较好的拟合度。超临界CO2萃取的猕猴桃籽油与己烷提取的油脂在脂肪酸组成上没有显著差别。     

在超临界二氧化碳中用TBP-HN03络合剂反应萃取Nd203中Nd的动力学

The process based on supercritical fluid extraction for reprocessing of the spent nuclear fuel has some remarkable advantages over the plutonium-uranium extraction (PUREX) process. Especially, it can minimize the generation of secondary waste. Dynamic reactive extraction of neodymium oxide (Nd2O3) in supercritical carbon dioxide (SC-CO2) containing tri-n-butyl phosphate-nitric acid (TBP-HNO3) complex was investigated. Temperature showed a positive effect on the extraction efficiency, while pressure showed a negative effect when the unsaturated TBP-HNO3 complex was employed for the dynamic reactive extraction of Nd2O3 in SC-CO2. Both temperature and pressure effects indicated that the kinetic process of the reactive extraction was controlled by the chemical reaction. A kinetic model was proposed to describe the extraction process.     

超临界CO2萃取玉米胚芽油工艺的研究

本文研究采用超临界ＣＯ２从玉米胚芽中萃取油品的工艺条件，运用响应面法探讨了萃取压力、萃取温度和物料粒径在油品产率为９０％时对ＣＯ２消耗量的影响，确定了最佳工艺参数，分析比较了超临界ＣＯ２萃取、正己烷索氏萃取和压榨三种方法对油品质量和脂肪酸组成的影响。     

蛋黄卵磷脂制备工艺及超临界CO_2脱蛋黄油实验研究

对用超临界CO_2萃取技术制备蛋黄卵磷脂的几种典型工艺进行了归纳、分析和比较。根据选择的工艺,对关键设备萃取器料筒进行了改进,通过正交试验,探讨了萃取压力、温度、时间、料筒层数等条件对蛋黄油脱除率的影响规律。     

Rheological characterization of egg yolk processed by spray-drying and lipid-cholesterol extraction with carbon dioxide

The present work studies the rheological properties of avian egg yolks processed by spray-drying and by lipid-cholesterol extraction with CO₂ under near-critical conditions. The results have been compared with those obtained from native egg products in order to analyze the effect of processing on the microstructure and rheological properties of egg yolks. The rheological study included linear viscoelasticity measurements by means of dynamic oscillatory shear and creep tests, which provided information about the unperturbed structure of the material, as well as steady-state flow measurements. The thermal denaturation of proteins, which was produced during the spray-drying of egg yolk, was responsible for the dramatic change from fluid to gel-like behavior. The thermal denaturation of proteins promotes the formation of a gel-like network, which may be attributed to exposure of internal hydrophobic groups that favor protein aggregation. Lipid (and cholesterol) extraction from yolk increased the viscoelasticity functions and flow properties due to the increased protein concentration.     

IgY isolation from a watery by-product obtained from an egg yolk fractionation process

The possibility of recovering IgY from a watery by-product produced during an egg yolk fractionation process was evaluated. The protocol employed for the extraction of IgY was the polyethylene glycol precipitation method. Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) was carried out to confirm the presence of IgY at the different steps of the IgY purification process. Finally, the amount of IgY obtained was quantified by means of anion exchange chromatography. Native egg yolk was employed as IgY reference source, and results showed that the by-product could be at least as suitable as egg yolk as an IgY source. Additionally, the use of the by-product as a source of biotechnological compounds, such as IgY, leads to an increase in the value added during the egg yolk fractionation process.