Artículos de revistas: "Ethanol precipitation"

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Fregel, Rosa, Ana González y Vicente M. Cabrera. "Improved ethanol precipitation of DNA". ELECTROPHORESIS 31, n.º 8 (abril de 2010): 1350–52. http://dx.doi.org/10.1002/elps.200900721.

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Green, Michael R. y Joseph Sambrook. "Precipitation of DNA with Ethanol". Cold Spring Harbor Protocols 2016, n.º 12 (diciembre de 2016): pdb.prot093377. http://dx.doi.org/10.1101/pdb.prot093377.

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Green, Michael R. y Joseph Sambrook. "Precipitation of RNA with Ethanol". Cold Spring Harbor Protocols 2020, n.º 3 (marzo de 2020): pdb.prot101717. http://dx.doi.org/10.1101/pdb.prot101717.

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4

Li, Li. "Study on Extraction Technology for Polysaccharide from Blood-supplementing Angelica Sinensis Decoction". Journal of Advances in Medicine Science 1, n.º 1 (1 de febrero de 2018): 26. http://dx.doi.org/10.30564/jams.v1i1.25.

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Purpose:Optimize water-alcohol technology for extracting polysaccharide from blood-supplementing angelica sinensis decoction to improve the extraction rate. Method:Draw the standard curve of glucose reference substance and build the regression equation to calculate the polysaccharide content. Investigate the effect of water addition times, extraction duration, extraction times, ethanol concentration for ethanol precipitation and times of ethanol precipitation on the extraction rate of polysaccharide. Result Add 8 times the medicinal material quality of water, and perform 2 extractions for 120min each time; it shows that conducting 2 ethanol precipitations with 80% ethanol concentration results in the maximum polysaccharide content, indicating the best extraction condition. Conclusion:The experiment establishes an easy and convenient water-alcohol method for extracting polysaccharide from blood-supplementing angelica sinensis decoction, and lays a research foundation on pharmacodynamics of polysaccharide in blood-supplementing angelica sinensis decoction.

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Sen, Dwaipayan, Aaron Gosling, Geoff W. Stevens, Prashant K. Bhattacharya, Andrew R. Barber, Sandra E. Kentish, Chiranjib Bhattacharjee y Sally L. Gras. "Galactosyl oligosaccharide purification by ethanol precipitation". Food Chemistry 128, n.º 3 (octubre de 2011): 773–77. http://dx.doi.org/10.1016/j.foodchem.2011.03.076.

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Taskila, Sanna, Mikko Ahokas, Juho Järvinen, Juho Toivanen y Juha P. Tanskanen. "Concentration and Separation of Active Proteins from Potato Industry Waste Based on Low-Temperature Evaporation and Ethanol Precipitation". Scientifica 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/5120947.

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Purpose. Potato fruit juice, a residue of starch industry, contains up to 2.5% [w/w] of proteins that are potentially valuable raw-materials of food, cosmetic, and pharma industries. The recovery of protein from the potato fruit juice is limited by the lack of industrially feasible concentration and separation technologies. The present research thus aimed at development of such process for the separation of active protease inhibitors from potato fruit juice.Methods. Low temperature mechanical vapor recompression evaporation was applied for concentration of potato fruit juice followed by ethanol precipitation for recovery of active proteins. The effects of precipitation temperature and precipitative agents were investigated employing response surface modeling methodology.Results. Concentration of potato fruit juice by evaporation was successful without loss of trypsin inhibition activity. Precipitation using 6.5 M ethanol at low temperature (0–+4°C) was found suitable for the recovery of active protease inhibitors from the concentrate. Piloting at starch industry yielded 50% of total proteins, with a high quantity of active protease inhibitors and a minor inclusion of other proteins.Conclusion. Concentration by low-temperature evaporation, followed by ethanol precipitation of protease inhibitors at optimized temperature, is an attractive option for valorization of potato fruit juice.

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Sarmphim, Pharunee, Pongsakorn Jantaratana y Chitnarong Sirisathitkul. "Size-Selective Precipitation and Aggregate Reduction of FePt-Based Nanoparticles". Journal of Nanomaterials 2018 (17 de julio de 2018): 1–5. http://dx.doi.org/10.1155/2018/3248051.

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Magnetic nanoparticles with a narrow size distribution are desirable for applications in ultra-high density data storage and biomedicine. In this work, the size-selective precipitation and aggregate reduction were combined to classify superparamagnetic iron platinum- (FePt-) based nanoparticles. The size-selective precipitation was implemented with the variation in the amount of ethanol. In the first condition, the ratio of ethanol-to-nanosuspension of 3 : 4 was used in the precipitation twice. By contrast, the second condition employed the ratios of ethanol-to-nanosuspension of 4 : 4 in the first precipitation and 5 : 4 in the second precipitation. The first precipitation successfully sorted out the aggregated particles, and the second precipitation collected particles with a narrow size distribution. The increase in ethanol enhanced the monodispersity of nanoparticles as shown by transmission electron microscopy (TEM) images and size distribution curves. In addition, large aggregated by-products from the precipitation stage were sonicated with the addition of surfactants. The increase in ultrasonic power reduces the aggregation, but the longer sonication led to an uneven distribution.

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Marques, Rodrigo F. C., Cécile Garcia, Pierre Lecante, Sidney J. L. Ribeiro, Laure Noé, Nuno J. O. Silva, Vítor S. Amaral, Angel Millán y Marc Verelst. "Electro-precipitation of Fe3O4 nanoparticles in ethanol". Journal of Magnetism and Magnetic Materials 320, n.º 19 (octubre de 2008): 2311–15. http://dx.doi.org/10.1016/j.jmmm.2008.04.165.

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Svaren, John, Sanae Inagami, Edith Lovegren y Roger Chalkley. "DNA denatures upon drying after ethanol precipitation". Nucleic Acids Research 15, n.º 21 (1987): 8739–54. http://dx.doi.org/10.1093/nar/15.21.8739.

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Cortez, Ely V., Adalberto Pessoa y Adilson N. Assis. "Xylanase recovery by ethanol and Na2SO4 precipitation". Applied Biochemistry and Biotechnology 70-72, n.º 1 (marzo de 1998): 661–66. http://dx.doi.org/10.1007/bf02920177.

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Tscheliessnig, Anne, Peter Satzer, Nikolaus Hammerschmidt, Henk Schulz, Bernhard Helk y Alois Jungbauer. "Ethanol precipitation for purification of recombinant antibodies". Journal of Biotechnology 188 (octubre de 2014): 17–28. http://dx.doi.org/10.1016/j.jbiotec.2014.07.436.

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12

Tanaka, Takumi, Ken Suzuki, Hirokazu Ueda, Yuka Sameshima-Yamashita y Hiroko Kitamoto. "Ethanol treatment for sterilization, concentration, and stabilization of a biodegradable plastic–degrading enzyme from Pseudozyma antarctica culture supernatant". PLOS ONE 16, n.º 6 (4 de junio de 2021): e0252811. http://dx.doi.org/10.1371/journal.pone.0252811.

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Biodegradable plastics must be sufficiently stable to maintain functionality during use but need to be able to degrade rapidly after use. We previously reported that treatment with an enzyme named PaE, secreted by the basidiomycete yeast Pseudozyma antarctica can speed up this degradation. To facilitate the production of large quantities of PaE, here, we aimed to elucidate the optimal conditions of ethanol treatment for sterilization of the culture supernatant and for concentration and stabilization of PaE. The results showed that Pseudozyma antarctica completely lost its proliferating ability when incubated in ≥20% (v/v) ethanol. When the ethanol concentration was raised to 90% (v/v), PaE formed a precipitate; however, its activity was restored completely when the precipitate was dissolved in water. To reduce ethanol use, PaE was successfully concentrated and recovered by sequential ammonium sulfate precipitation and ethanol precipitation steps. Over 90% of the activity in the original culture supernatant was recovered and the specific activity was increased 3.4-fold. By preparing the enzyme solution at a final concentration of 20% (v/v) ethanol, about 60% of the initial activity was maintained at ambient temperature for over 6 months without growth of microbes. We conclude that ethanol treatment is effective for sterilization, concentration, and stabilization of PaE, and that concentrating PaE by sequential ammonium sulfate precipitation and ethanol precipitation substantially increases the PaE purity and decreases ethanol use.

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13

Wang, Kai Jun, Jin Hu, Hua Wang, Jian Liang Liu, Xiao Lan Cai y Wen Gui Gao. "Comparative Analysis of Adding Hydrogen Peroxide or Ethanol in Preparation of Zirconia Nano-Powder by Coprecipitation Methods". Key Engineering Materials 434-435 (marzo de 2010): 793–95. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.793.

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Zirconia precursor was prepared by adding hydrogen peroxide or ethanol in co-precipitation process from raw materials of ZrOC12•8H2O and ammonia, the zirconia powders were subsequently obtained by calcination of the precursor at 600°C and ball milling. Through the analyzed by TG-DTA, XRD, SEM, the results show that by adding hydrogen peroxide or ethanol in co-precipitation process can reduce the produce of agglomerate. Ethanol and hydrogen peroxide addition on zirconia by co-precipitation for different reaction results were compared and analyzed.

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14

Wang, Shaoyan, Xiaoan Li, Shaofeng Wang, Yang Li y Yuchun Zhai. "Synthesis of γ-alumina via precipitation in ethanol". Materials Letters 62, n.º 20 (julio de 2008): 3552–54. http://dx.doi.org/10.1016/j.matlet.2008.03.048.

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15

Paithankar, K. R. y K. S. N. Prasad. "Precipitation of DNA by polyethylene glycol and ethanol". Nucleic Acids Research 19, n.º 6 (1991): 1346. http://dx.doi.org/10.1093/nar/19.6.1346.

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16

Friedman, Marc A. y Bradford J. Wood. "Precipitation of Gadolinium and Ethanol during Nerve Block". Journal of Vascular and Interventional Radiology 14, n.º 3 (marzo de 2003): 394. http://dx.doi.org/10.1097/01.rvi.0000058416.01661.e5.

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17

Sambrook, Joseph y David W. Russell. "Purification of Radiolabeled Oligonucleotides by Precipitation with Ethanol". Cold Spring Harbor Protocols 2006, n.º 1 (junio de 2006): pdb.prot3490. http://dx.doi.org/10.1101/pdb.prot3490.

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Sambrook, Joseph y David W. Russell. "Standard Ethanol Precipitation of DNA in Microcentrifuge Tubes". Cold Spring Harbor Protocols 2006, n.º 1 (1 de enero de 2006): pdb.prot4456. http://dx.doi.org/10.1101/pdb.prot4456.

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19

Ip, Alexander C. F., Tsung Hao Tsai, Imran Khimji, Po-Jung Jimmy Huang y Juewen Liu. "Degradable starch nanoparticle assisted ethanol precipitation of DNA". Carbohydrate Polymers 110 (septiembre de 2014): 354–59. http://dx.doi.org/10.1016/j.carbpol.2014.04.007.

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20

Lerner, Eyal, Reuven Azoury y Sara Sarig. "Rapid precipitation of apatite from ethanol-water solution". Journal of Crystal Growth 97, n.º 3-4 (octubre de 1989): 725–30. http://dx.doi.org/10.1016/0022-0248(89)90576-9.

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21

Kumoro, Andri, Tunjung Yuganta, Diah Retnowati y Ratnawati Ratnawati. "Acid Hydrolysis and Ethanol Precipitation for Glucomannan Extraction from Crude Porang (Amorphophallus Oncophyllus) Tuber Flour". Chemistry & Chemical Technology 12, n.º 1 (21 de marzo de 2018): 101–8. http://dx.doi.org/10.23939/chcht12.01.101.

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22

Hamzah, Muhammad Hazwan, Steve Bowra y Philip Cox. "Effects of Ethanol Concentration on Organosolv Lignin Precipitation and Aggregation from Miscanthus x giganteus". Processes 8, n.º 7 (16 de julio de 2020): 845. http://dx.doi.org/10.3390/pr8070845.

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This work assesses the behavior of organosolv lignin aggregates derived from Miscanthus x giganteus using different ethanol concentrations (10%, 25%, 50%, and 75% by volume). The percentage of lignin recovery was found to decrease from 75.8% to 71.4% and 25.1%, as the ethanol concentration was increased from 10% to 25% and 50%, respectively. Increasing the ethanol concentration further to 75% led to zero recovery. The purity of the precipitated lignin was consistently found to be ≥90%. Lignin derived from the dried supernatant obtained at 50% ethanol concentration resulted in high lignin purity (51.6%) in comparison with the other ethanol concentrations used. Fourier transform infrared spectroscopy analysis showed that the precipitated lignin and dried supernatant at 50% ethanol concentration possessed the highest peak intensity apportioned to wavenumber of lignin as compared to that of at 25% and 10% ethanol concentrations, and the results linked with the percentage of lignin purity. The results of particle size analysis for precipitated lignin demonstrated particle sizes of 306, 392, and 2050 nm for 10%, 25%, and 50% ethanol concentrations, respectively, and the remaining supernatant with average particle sizes of 1598, 1197, and 875 nm, respectively. These results were verified with the morphology of lignin macromolecules in scanning electron microscopy images. Results of the particle size distribution of lignin revealed that the overall size of lignin aggregates decreased with decreasing ethanol concentration. In summary, these findings suggest that ethanol concentration affected the behavior of lignin aggregates in water–ethanol solution.

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23

Benefo, Edmund Ofosu y Isaac Williams Ofosu. "Bromelain Activity of Waste Parts of Two Pineapple Varieties". Sustainable Food Production 2 (junio de 2018): 21–28. http://dx.doi.org/10.18052/www.scipress.com/sfp.2.21.

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Bromelain, a protease found in pineapples, is of high demand in the pharmaceutical, cosmetic and food industries. Along the pineapple processing chain, waste products such as peels, crowns, stems and cores result. These parts are usually discarded, though they contain significant amounts of the enzyme bromelain. This study sought to determine the bromelain activity of the crowns and peels of two pineapple varieties grown in Ghana;MD2andSugarloaf. The crude extract was obtained by homogenising the peels and crowns in a cold phosphate buffer and centrifuging at 3000 rpm for 15 min. Ethanol and ammonium sulphate precipitation were carried out on the extract between 30% – 80% precipitation levels. The enzyme activity was determined using the casein digestion method. Results showed that bromelain was precipitated mainly in the 30% – 60% precipitation range.Sugarloafcrowns yielded the highest enzyme activity of 20.82 U/ml and a specific activity of 194.58 U/mg at the 40% ammonium sulphate precipitation level. This was followed by theSugarloafpeels with an enzyme activity of 19.98 U/ml at 50% ethanol precipitation level. Ethanol precipitation resulted in fractions with lower bromelain activity. Enzyme activity was higher in theSugarloafvariety and also in the crowns of both varieties. The two pineapple varieties have significant levels of bromelain activity and could be exploited for commercialisation.

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Golunski, Simone, Viviane Astolfi, Naira Carniel, Débora de Oliveira, Marco Di Luccio, Marcio A. Mazutti y Helen Treichel. "Ethanol precipitation and ultrafiltration of inulinases from Kluyveromyces marxianus". Separation and Purification Technology 78, n.º 3 (abril de 2011): 261–65. http://dx.doi.org/10.1016/j.seppur.2011.02.019.

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Soares, Paulo A. G., Antônio F. M. Vaz, Maria T. S. Correia, Adalberto Pessoa y Maria G. Carneiro-da-Cunha. "Purification of bromelain from pineapple wastes by ethanol precipitation". Separation and Purification Technology 98 (septiembre de 2012): 389–95. http://dx.doi.org/10.1016/j.seppur.2012.06.042.

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26

Gaillard, Claire y François Strauss. "Ethanol precipitation of DNA with linear polyacrylamide as carrier". Nucleic Acids Research 18, n.º 2 (25 de enero de 1990): 378. http://dx.doi.org/10.1093/nar/18.2.378.

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27

Rio, D. C., M. Ares, G. J. Hannon y T. W. Nilsen. "Ethanol Precipitation of RNA and the Use of Carriers". Cold Spring Harbor Protocols 2010, n.º 6 (1 de junio de 2010): pdb.prot5440. http://dx.doi.org/10.1101/pdb.prot5440.

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Yu, Chen, Shuang Quan, Cui Yang, Chengliang Zhang, Jiajin Fan, Lian Li y Hengchang Zang. "Determination of the immunoglobulin G precipitation end-point by an intelligent near-infrared spectroscopy system". Journal of Innovative Optical Health Sciences 14, n.º 03 (29 de enero de 2021): 2150007. http://dx.doi.org/10.1142/s1793545821500073.

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Precipitation is a key manufacturing unit during the immunoglobulin G (IgG) production, which guarantees the quality of the final product. Ethanol is usually used to purify IgG during the precipitation process, so it is important to monitor the ethanol concentration online. Near-infrared (NIR) spectroscopy is a powerful process analytical technology (PAT) which has been proved to be feasible to determine the ethanol concentration during the precipitation process. However, the NIR model is usually established based on the specific process, so a universal model is needed. And the clarity degree of solution will affect the quality of the spectra. Therefore, in this study an integrated NIR system was introduced to establish a universal NIR model which could predict the ethanol concentration online and determine the end-point of the whole process. First, a spectra acquisition device was designed and established in order to get high-quality NIR spectra. Then, a simple prepared ethanol NIR model was constructed to predict the actual manufacturing process. Finally, the end-point was determined to stop the peristaltic pump when the ethanol concentration reached 20%. The results showed that the spectra quality was good, model prediction was accurate, and process monitoring was accurate. In conclusion, all results indicated that the integrated NIR system could be used to monitor the biopharmaceutical process to help us understand the pharmaceutical process.

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Alviany, Riza, Arifuddin Wahyudi, Ignatius Gunardi, Achmad Roesyadi, Firman Kurniawansyah y Danawati Hari Prajitno. "Diethyl Ether Production as a Substitute for Gasoline". MATEC Web of Conferences 156 (2018): 06003. http://dx.doi.org/10.1051/matecconf/201815606003.

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Diethyl ether is one of alternative fuel that could be used as a significant component of a blend or as a complete replacement for transportation fuel. The aim of this research is to produce diethyl ether through dehydration reaction of ethanol with fixed bed reactor using nanocrystalline γ-Al2O3 catalyst. Nanocrystalline γ-Al2O3 catalyst was synthesized by precipitation method using Al(NO3)3.9H2O as precursors and NH4OH as the precipitating agent. Dehydration reaction was performed at temperature range of 125 to 225°C. The result shows that synthesized γ-Al2O3 catalyst gave higher ethanol conversion and diethyl ether yield than that of commercial Al2O3 catalyst. The use of synthesized γ-Al2O3 catalyst could reach ethanol conversion as high as 94.71% and diethyl ether yield as high as 11,29%.

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Wu, Yu Qiong y Wei Dong Man. "Study on Ultrasonic Assisted - Precipitation Method Combined Purification of Tea Saponin". Advanced Materials Research 634-638 (enero de 2013): 1552–56. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.1552.

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Commercial crude tea saponin as raw material, ultrasonic assisted extraction technology of tea saponin was investigated. Five influence factors of ethanol concentration, extraction temperature, extraction time, solid-liquid ratio, ultrasonic power on the extraction of tea saponin were studied in detail. Orthogonal experiment through the single factor experiment design, the experimental results show that the optimum operating conditions for the ethanol concentration of 80%, solid-liquid ratio 1: 40, extraction temperature 40°C, ultrasonic power of 300W, ultrasonic extraction time 45 minutes. Under the optimum conditions obtained tea saponin extract with ethanol- acetone precipitation method is further purified, tea saponin content increased from 52.1% to 93.6%. The result indicated that the purity of the tea saponin could be effectively improved through the ultrasonic assisted- precipitation combined method.

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Chen, Hong Yu y Ru Yang. "Co-Precipitation Synthesis and Supercritical Ethanol Drying of Yttrium Aluminum Garnet (YAG) Powders". Advanced Materials Research 11-12 (febrero de 2006): 11–14. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.11.

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YAG precursors were co–precipitated from a mixed solution of aluminum and yttrium nitrates using urea as precipitant. After being washed by ethanol several times, the gel–like precursor was dispersed in absolute ethanol to form suspended liquid. The mixture was placed into a high–pressure autoclave, which followed by heating ethanol to supercritical state (Tc > 243°C and Pc > 6.3Mpa). The precursor dried via supercritical ethanol fluid technique was sintered at different temperature according to requirement. The phase transformation, composition and micro–structural features of the products were characterized by XRD, TG/DSC, BET and TEM techniques. It was found that after supercritical ethanol fluid drying the precursor was well dispersed, uniform and caused better sinterability of the resultant YAG powder. XRD results indicated that the precursor was partial crystalline and the pure phase YAG can be obtained at 1200°C calcinated for 2h. TG/DSC revealed the formation process of YAG phase. The averaged size of YAG nanocrystalline powder was 30–40nm and well dispersed according to TEM.

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Shrgawi, Norsyabila, Intan Juliana Shamsudin, Hussein Hanibah, Siti Aminah Mohd Noor y Norherdawati Kasim. "Purification on Kappa Carrageenan by Re-Precipitation Technique". Solid State Phenomena 317 (mayo de 2021): 327–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.317.327.

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Purification on kappa (ƙ) carrageenan was performed by dissolving ƙ-carrageenan powder in distilled water and re-precipitated with ethanol and n-hexane separately during re-precipitation process. The purified kappa carrageenan was analyzed by using Fourier transform infrared (FTIR) spectroscopy and carbon, hydrogen, nitrogen, and sulfur (CHNS) elemental analysis. The outcomes from FTIR showed there are physical changes due to intermolecular interactions which lead to decrease and lower intensity of hydroxyl band at 3345 cm-1 after re-precipitated with n-hexane, compared to re-precipitation with ethanol and unpurified ƙ-carrageenan. There were variations observed in the percentages of C, H and S in the CHNS analysis between unpurified and purified ƙ-carrageenan. The successfully purified ƙ-carrageenan are suitable to be used for further application.

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Kong, Xiang Zheng, Xiang Ling Gu, Xiaoli Zhu y Lina Zhang. "Precipitation Polymerization in Ethanol and Ethanol/Water to Prepare Uniform Microspheres of Poly(TMPTA-styrene)". Macromolecular Rapid Communications 30, n.º 11 (2 de junio de 2009): 909–14. http://dx.doi.org/10.1002/marc.200800772.

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Tai, Yanni, Haibin Qu y Xingchu Gong. "Design Space Calculation and Continuous Improvement Considering a Noise Parameter: A Case Study of Ethanol Precipitation Process Optimization for Carthami Flos Extract". Separations 8, n.º 6 (24 de mayo de 2021): 74. http://dx.doi.org/10.3390/separations8060074.

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The optimization of process parameters in the pharmaceutical industry is often carried out according to the Quality by Design (QbD) concept. QbD also emphasizes that continuous improvement should be performed in life cycle management. Process parameters that are difficult to control in actual production can be regarded as noise parameters. In this study, based on the QbD concept, the ethanol precipitation process of Carthami Flos extract was optimized, considering a noise parameter. The density of the concentrated extract, ethanol concentration, the volume ratio of ethanol to concentrated extract, stirring time after ethanol addition, and refrigeration temperature were selected as critical process parameters (CPPs), using a definitive screening design. The mathematical models among CPPs and evaluation indicators were established. Considering that the refrigeration temperature of industrial ethanol precipitation is often difficult to control with seasonal changes, refrigeration temperature was treated as a noise parameter. A calculation method for the design space in the presence of the noise parameter was proposed. The design space was calculated according to the probability of reaching the standards of evaluation indicators. Controlling parameters within the design space was expected to reduce the influence of noise parameter fluctuations on the quality of the ethanol precipitation supernatant. With more data obtained, the design space was updated. In industry, it is also recommended to adopt a similar idea: that is, continuing to collect industrial data and regularly updating mathematical models, which can further update the design space and make it more stable and reliable.

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Magnabosco, Giulia, Andrea M. M. Condorelli, Rose Rosenberg, Iryna Polishchuk, Boaz Pokroy, Denis Gebauer, Helmut Cölfen y Giuseppe Falini. "Non-stoichiometric hydrated magnesium-doped calcium carbonate precipitation in ethanol". Chemical Communications 55, n.º 86 (2019): 12944–47. http://dx.doi.org/10.1039/c9cc07087g.

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Fialaire, Anne y Eric Postaire. "Hydrolysis of Peptide Binding by Phosphotungstic Acid". Journal of AOAC INTERNATIONAL 77, n.º 5 (1 de septiembre de 1994): 1338–40. http://dx.doi.org/10.1093/jaoac/77.5.1338.

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Abstract A new method for the precipitation of protein and oligopeptides is described. In this method, the selectivity of precipitation is a function of the percentage of alcohol. With an 80:20 (v/v) mixture of ethanol and water at room temperature, the selectivity of oligopeptide precipitation was as good as that using phosphotungstic acid.

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Mariño, M. A., S. Freitas y E. A. Miranda. "ETHANOL PRECIPITATION OF GLYCOSYL HYDROLASES PRODUCED BY Trichoderma harzianum P49P11". Brazilian Journal of Chemical Engineering 32, n.º 2 (junio de 2015): 325–33. http://dx.doi.org/10.1590/0104-6632.20150322s00003268.

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Tao, Shanwen, Feng Gao, Xingqin Liu y Ole Toft Sørensen. "Ethanol-sensing characteristics of barium stannate prepared by chemical precipitation". Sensors and Actuators B: Chemical 71, n.º 3 (diciembre de 2000): 223–27. http://dx.doi.org/10.1016/s0925-4005(00)00618-3.

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Ku, Yuoh, Olaf Jansen, Carolyn J. Oles, Esther Z. Lazar y Jeanne I. Rader. "Precipitation of inulins and oligoglucoses by ethanol and other solvents". Food Chemistry 81, n.º 1 (mayo de 2003): 125–32. http://dx.doi.org/10.1016/s0308-8146(02)00393-x.

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40

Smidsrød, Olav y Arne Haug. "Precipitation of acidic polysaccharides by salts in ethanol-water mixtures". Journal of Polymer Science Part C: Polymer Symposia 16, n.º 3 (7 de marzo de 2007): 1587–98. http://dx.doi.org/10.1002/polc.5070160335.

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Mattice, Kristin D. y Alejandro G. Marangoni. "Functionalizing zein through antisolvent precipitation from ethanol or aetic acid". Food Chemistry 313 (mayo de 2020): 126127. http://dx.doi.org/10.1016/j.foodchem.2019.126127.

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Oh, Hanjin, Ji Young Lee, Moo Kon Kim, In Chul Um y Ki Hoon Lee. "Refining hot-water extracted silk sericin by ethanol-induced precipitation". International Journal of Biological Macromolecules 48, n.º 1 (enero de 2011): 32–37. http://dx.doi.org/10.1016/j.ijbiomac.2010.09.008.

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Wang, Yuanfeng, Lan Yu y Xinlin Wei. "Monosaccharide composition and bioactivity of tea flower polysaccharides obtained by ethanol fractional precipitation and stepwise precipitation". CyTA - Journal of Food 10, n.º 1 (febrero de 2012): 1–4. http://dx.doi.org/10.1080/19476337.2010.523901.

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Chang, Yajing, Xudong Yao, Longfei Mi, Guopeng Li, Shengda Wang, Hui Wang, Zhongping Zhang y Yang Jiang. "A water–ethanol phase assisted co-precipitation approach toward high quality quantum dot–inorganic salt composites and their application for WLEDs". Green Chemistry 17, n.º 8 (2015): 4439–45. http://dx.doi.org/10.1039/c5gc01109d.

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45

Qiu, Ling L., Stanley S. Levinson, Kristen L. Keeling y Ronald J. Elin. "Convenient and Effective Method for Removing Fibrinogen from Serum Specimens before Protein Electrophoresis". Clinical Chemistry 49, n.º 6 (1 de junio de 2003): 868–72. http://dx.doi.org/10.1373/49.6.868.

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Abstract Background: Fibrinogen in serum specimens can be misinterpreted on protein electrophoresis as a monoclonal protein. We evaluated selective precipitation of fibrinogen with ethanol. Methods: Pooled human plasma was mixed with absolute ethanol or saline (final concentrations of 40, 80, 100, 120, and 160 mL/L) and incubated at 4 °C overnight or placed in an ice bath for 15 min. After centrifugation, the supernatants and resuspended pellets were used for protein electrophoresis and quantitative measurements of protein and fibrinogen. Results: The fibrinogen band was effectively eliminated from the electrophoretic pattern in the plasma samples treated with ethanol at 100 mL/L and incubated in an ice bath for 15 min without a significant change in immunoglobulin concentrations. The 100 mL/L ethanol did not noticeably change the electrophoretic pattern of monoclonal immunoglobulins. This approach allowed analysis of a sample collected from an arteriovenous shunt kept open with heparin. Conclusions: Ethanol, 100 mL/L, can selectively precipitate fibrinogen without significantly interfering with the immunoglobulins. The precipitation process can be completed in 15 min at 0–4 °C and can avoid the need to obtain another blood sample.

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46

Horne, David S. "Ethanol stability of casein micelles – a hypothesis concerning the role of calcium phosphate". Journal of Dairy Research 54, n.º 3 (agosto de 1987): 389–95. http://dx.doi.org/10.1017/s0022029900025565.

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SummaryThe ethanol (EtOH) stability of skim milk and the stability towards aggregation of casein micelles diluted into ethanolic buffer solutions were compared using data obtained from previously published experiments. Differences in absolute stability and in relative response were observed when Ca2+ level and pH were adjusted, the buffer system results lying below those from skim milk in both cases. Increasing the ionic strength of skim milk adjusted to pH 7·0 lowered its EtOH stability whereas increasing the ionic strength of the diluting buffer increased the stability of the casein micelles. The hypothesis is put forward that the differences are due to the simultaneous precipitation of Ca phosphate when EtOH is added to skim milk. This draws calcium from the caseinate sites of the micelle, counteracting the destabilizing effects of the EtOH towards the micelle. Such removal and the consequent restructuring are kinetically controlled and micellar precipitation in skim milk finally occurs when the micellar coagulation time falls within the time scale of the restructuring reactions.

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47

Ge, Xiu Tao, Jun Hai Wang, Ding Wang y Jia Qiang Xu. "The Preparation of ZnO Gas-Sensing Material by Nucleation-Crystallization Separation Method". Advanced Materials Research 152-153 (octubre de 2010): 1031–37. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.1031.

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The ZnO nanoparticles were synthesized by Nucleation-Crystallization Separation and co-precipitation. The structures and formed phase temperature of the samples were researched by X-ray diffraction (XRD) and DSC -TGA. Gas sensing properties of the samples were measured by a stationary state gas distribution method under static state. The results show that the ZnO prepared from Nucleation-Crystallization Separation has a higher response to 50 ppm ethanol and gasoline than ZnO prepared from co-precipitation. The sensitivity of ZnO prepared from Nucleation-Crystallization Separation to 50 ppm ethanol and gasoline are 34 and 68, which is better than the sensitivity of ZnO prepared from co-precipitation (17 and 28). The good sensing property may be due to the independence of nucleation and crystallization steps, which helps the more uniformity and thermal stability and the larger space utilization of ZnO particles.

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48

Yuan, Chuanxun, Yan Li, Qingchuan Li, Risheng Jin y Lili Ren. "Purification of Tea saponins and Evaluation of its Effect on Alcohol Dehydrogenase Activity". Open Life Sciences 13, n.º 1 (10 de abril de 2018): 56–63. http://dx.doi.org/10.1515/biol-2018-0008.

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AbstractTea saponins, extracted from a Camellia oleifera cake, were found to have a potent effect on de-alcoholic activity. To obtain highly pure tea saponins, which can better maintain the activity of alcohol dehydrogenase (ADH), this paper presents an extraction method for tea saponins using deionized water as the extraction agent and a two-stage precipitation method, including ethanol precipitation and CaO precipitation. The optimum conditions for ethanol precipitation were 95% alcohol, a duration of 1.5h and a solid/liquid ratio of 1:4; while the optimum conditions for CaO precipitation were a duration of 2h and an NH4HCO3/CaO ratio of 2:1. Under the optimum conditions, the content of saponins was 87.58%. The results showed that the greater the amount of tea saponins and the higher its purity, the more significant its activating effect on ADH. When the purity of tea saponins was above 75%, it activated ADH. It indicated that the de-alcoholic mechanism of tea saponins is associated with the activity of ADH. Furthermore, the study characterized the structure of tea saponins by UV absorption and Fourier Transform Infrared (FTIR) spectrometry and LC-MS.

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49

Žáček, Stanislav, Jaroslav Nývlt y John William Mullin. "Mixed suspension - mixed product removal crystallization kinetics: Effect of the method of supersaturation generation". Collection of Czechoslovak Chemical Communications 52, n.º 1 (1987): 72–80. http://dx.doi.org/10.1135/cccc19870072.

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Three methods of continuous crystallization of potassium aluminium sulphate have been compared: crystallization by cooling, precipitation from solutions of component salts (potassium sulphate and aluminium sulphate) and salting-out with ethanol. Crystal size distribution of the products has been used to obtain crystallization kinetic data in two parallel ways, viz. using the concept of population balance and that of mass oversize distribution, both of which led to similar conclusions. The results of cooling and precipitation are comparable, but crystallization by salting-out with ethanol leads to smaller crystals and the results strongly depend on the alcohol concentration, which can be explained by the influence of micromixing.

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50

Luengo, Y., M. P. Morales, L. Gutiérrez y S. Veintemillas-Verdaguer. "Counterion and solvent effects on the size of magnetite nanocrystals obtained by oxidative precipitation". Journal of Materials Chemistry C 4, n.º 40 (2016): 9482–88. http://dx.doi.org/10.1039/c6tc03567a.

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