Name: procedure to evaluate the efficiency of flocculants for the removal of dispersed particles from plant extracts
Uploaded: 2016-04-09T13:00:00.000+00:00
Duration: 10 min 37 s
Description: Watch this Scientific Journal Video about Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts at JoVE.com

I would like to acknowledge Dr. Thomas Rademacher for providing the transgenic tobacco seeds and Ibrahim Al Amedi for cultivating the tobacco plants. I wish to thank Dr. Richard M Twyman for editorial assistance and Prof. Dr. Rainer Fischer for fruitful discussions. This work was funded in part by the European Research Council Advanced Grant ''Future-Pharma'', proposal number 269110, the Fraunhofer-Zukunftsstiftung (Fraunhofer Future Foundation) and the Fraunhofer-Gesellschaft Internal Programs under Grant No. Attract 125-600164.

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粒子の凝集を特徴付けるためにエネルギー省を設定する際に考慮すべき最も重要な側面は、デザインは、原則的に例えば 、pH、ポリマーの種類とポリマー濃度16の影響を予想または考えられる影響36,38を検出し、記述することができなければならないということです。したがって、実際の実験を開始する前に、設計空間（FDS）の割合を評価することが重要です。 FDSは、 ...

植物は、広くそのようなフルーツジュースのような食料品を製造するために使用されるが、それらはまた、より高い値のバイオ医薬品製品1-3の製造のためのプラットフォームとして開発することができます。両方の場合において、下流処理（DSP）は、多くの場合、粒子を含んだ抽出物4,5の明確化に続いて、このような葉や果実などの組織からの液体の抽出から始まります。バイオ医薬品の製造のために、DSPのコストが全体的な製造コスト6,7の最大80％を占めることができ、これは、部分的には、ブレードベースの均質8,9として破壊の方法で調製した抽出物中に存在する高い粒子負荷を反映しています。抽出物中の粒度分布に合わせてフィルタ層の合理的な選択は、フィルタ容量を増加し、コスト10,11を削減することができるが、改善がごとに保持されなければならない粒子の数によって定義される絶対的な容量の上限を超えることはできません明確化を達成するためのフィルタ領域の単位。 より少ない粒子が濾過列における最高のフィルタの表面に到達した場合天井に持ち上げることができる、分散粒子が大きなフロック12を形成するために凝集を促進する凝集剤として知られているポリマーと混合される場合、これを達成することができます。このようなフロックの微細化と、より高価なデプスフィルターに到達する粒子の負担を軽減し、より粗い及びより安価なバッグフィルターによってさらに上流に保持することができます。ポリマーは、適正製造基準（GMP）に準拠している必要があり、そして典型的にはモル質量&gt; 100 kDaのを持っている必要がありますし、中立的であるか、または13を帯電したことができますいずれかのバイオ医薬品などのため、それらの用途に適した安全性プロファイルを、持っている必要があります。中立凝集剤は、一般に、それらの凝集および径のフロックを形成させる分散粒子を架橋することによって作用するのに対し、1ミリメートル11、荷電ポリマーがdの電荷を中和します&gt;ispersed粒子は、その溶解性を低下させ、従って、沈殿14を引き起こします。 凝集は、抽出物15,16の特性と一致するように、このような緩衝液のpHまたは導電率、及びポリマーの種類や濃度などのパラメータを調整することによって改善することができます。 0.5〜5.0のG L -1ポリエチレンイミン（PEI）で前処理したタバコ抽出物については、デプスフィルタ容量の2倍以上の増加が100-Lパイロット規模のプロセスで報告されました。セルロース系濾過助剤17と組み合わせた場合、このポリマーのコスト未満€10キロ-1プロセスにため、その導入は、フィルタ、さらにバッチ16またはあたりの消耗品のため、約€6,000コスト削減をもたらしています。たとえそうであっても、予測モデルは、それらの含有は15〜30分間16,18のホールドステップを必要とすることができるため、ストレージのための更なる投資コストで、その結果、凝集剤の先験的経済的利益を評価するために必要とされますタンク。しかし、凝集の複雑な性質のために、このような実験の結果を予測することができます利用可能なメカニズムのモデルは現在ありません。そのため、より適切な設計・オブ・実験（DOE）アプローチ19本資料に記載されているよう開発されました。一般のDOE手順のためのプロトコルは、最近20を出版されました。 小規模な装置は現在、凝集条件21のハイスループットスクリーニングのために利用可能です。しかしながら、これらのデバイスは、現実的に、植物の凝集中に条件をシミュレートしないことがあり、反応容器（96ウェルプレートのウェルについて約7 mm）の寸法ために抽出した粒子またはフロックは離れて一桁未満であることができます。これは、混合パターンため、​​モデルの予測力に影響を与えることができます。また、原因混合挙動の非線形変化の沈殿を含む方法を縮小し、STAを沈殿させることは困難です性22。そこで、この記事では、100Lのパイロットスケールプロセス16への最初の20ミリリットルの反応ボリュームからスケーラブルな結果をもたらす、一日あたり50から75のサンプルのスループットを持つベンチトップ規模スクリーニングシステムの概要を説明します。エネルギー省のアプローチと組み合わせると、これは予測モデルは、品質・バイ・デザインコンセプトの一環として、プロセスの最適化やドキュメントのために使用することができます。 以下に記載される方法はまた、凝集剤はまた、コスト削減ツール23として検討されている細胞培養ベースのプロセスで製造バイオ医薬品に適合させることができます。また、キャノーラ、トウモロコシおよび大豆24,25で生産βグルクロニダーゼのために示されているように、精製戦略の一部として、粗抽出物から標的タンパク質の沈殿をモデル化するために使用することができます。凝集剤の特性の詳細な説明は、16,26の他の場所見つけることができ、そのポリマーconcentrを確保することが重要ですationsは、非毒性または最終製品11中の有害レベル以下のいずれかです。

<table><tbody><tr><td>2100P Portable Turbidimeter</td><td>Hach</td><td>4650000</td><td>Turbidimeter</td></tr><tr><td>2G12 antibody</td><td>Polymun</td><td>AB002</td><td>Reference antibody</td></tr><tr><td>Biacore T200</td><td>GE Healthcare</td><td>28-9750-01</td><td>SPR device</td></tr><tr><td>BP-410</td><td>Furh</td><td>2632410001</td><td>Bag filter</td></tr><tr><td>Catiofast VSH</td><td>BASF</td><td>79002360</td><td>Flocculating agent</td></tr><tr><td>Centrifuge 5415D</td><td>Eppendorf</td><td>5424 000.410</td><td>Centrifuge</td></tr><tr><td>Centrifuge tube 15 ml</td><td>Labomedic</td><td>2017106</td><td>Reaction tube</td></tr><tr><td>Centrifuge tube 50 ml self-standing</td><td>Labomedic</td><td>1110504</td><td>Reaction tube</td></tr><tr><td>Chitosan</td><td>Carl Roth GmbH</td><td>5375.1</td><td>Flocculating agent</td></tr><tr><td>Design-Expert(R) 8</td><td>Stat-Ease, Inc.</td><td>n.a.</td><td>DoE software</td></tr><tr><td>Disodium phosphate</td><td>Carl Roth GmbH</td><td>&amp;nbsp;4984.3&amp;nbsp;</td><td>Media component</td></tr><tr><td>Ferty 2 Mega</td><td>Kammlott</td><td>5.220072</td><td>Fertilizer</td></tr><tr><td>Forma -86C ULT freezer</td><td>ThermoFisher</td><td>88400</td><td>Freezer</td></tr><tr><td>Greenhouse</td><td>n.a.</td><td>n.a.</td><td>For plant cultivation</td></tr><tr><td>Grodan Rockwool Cubes 10 x 10 cm</td><td>Grodan</td><td>102446</td><td>Rockwool block</td></tr><tr><td>HEPES</td><td>Carl Roth GmbH</td><td>9105.3</td><td>Media component</td></tr><tr><td>K700P 60D</td><td>Pall</td><td>5302305</td><td>Depth filter layer</td></tr><tr><td>KS50P 60D</td><td>Pall</td><td>B12486</td><td>Depth filter layer</td></tr><tr><td>Miracloth</td><td>Labomedic</td><td>475855-1R</td><td>Filter cloth</td></tr><tr><td>MultiLine Multi 3410 IDS</td><td>WTW</td><td>WTW_2020</td><td>pH meter / conductivity meter</td></tr><tr><td>Osram cool white 36 W</td><td>Osram</td><td>4930440</td><td>Light source</td></tr><tr><td>Phytotron</td><td>Ilka Zell</td><td>n.a.</td><td>For plant cultivation</td></tr><tr><td>Polymin P</td><td>BASF</td><td>79002360</td><td>Flocculating agent</td></tr><tr><td>POLYTRON PT 6100 D</td><td>Kinematica</td><td>11010110</td><td>Homogenization device with custom blade tool</td></tr><tr><td>Protein A</td><td>Life technologies</td><td>10-1006</td><td>Antibody binding protein</td></tr><tr><td>Sodium chloride</td><td>Carl Roth GmbH</td><td>P029.2</td><td>Media component</td></tr><tr><td>Synergy HT</td><td>BioTek</td><td>SIAFRT</td><td>Fluorescence plate reader</td></tr><tr><td>TRIS</td><td>Carl Roth GmbH</td><td>4855.3</td><td>Media component</td></tr><tr><td>Tween-20</td><td>Carl Roth GmbH</td><td>9127.3</td><td>Media component</td></tr><tr><td>VelaPad 60</td><td>Pall</td><td>VP60G03KNH4</td><td>Filter housing</td></tr><tr><td>Zetasizer Nano ZS</td><td>Malvern</td><td>ZEN3600</td><td>DLS particle size distribution measurement</td></tr></tbody></table>

procedure to evaluate the efficiency of flocculants for the removal of dispersed particles from plant extracts

Plants are important to humans not only because they provide commodities such as food, feed and raw materials, but increasingly because they can be used as manufacturing platforms for added-value products such as biopharmaceuticals. In both cases, liquid plant extracts may need to be clarified to remove particulates. Optimal clarification reduces the costs of filtration and centrifugation by increasing capacity and longevity. This can be achieved by introducing charged polymers known as flocculants, which cross-link dispersed particles to facilitate solid-liquid separation. There are no mechanistic flocculation models for complex mixtures such as plant extracts so empirical models are used instead. Here a design-of-experiments procedure is described that allows the rapid screening of different flocculants, optimizing the clarification of plant extracts and significantly reducing turbidity. The resulting predictive models allow the identification of robust process conditions and sets of polymers with complementary properties, e.g. effective flocculation in extracts with specific conductivities. The results presented for tobacco leaf extracts can easily be adapted to other plant species or tissues and will thus facilitate the development of more cost-effective downstream processes for commodities and plant-derived pharmaceuticals.

異なるポリマーとタバコ抽出物の凝集上述の方法は、正常なモノクローナル抗体（HIV中和抗体2G12）と蛍光タンパク質（DsRedの）（ 図1）16の製造中にタバコ抽出物の凝集のためのプロセスを開発するために使用し、以降転送されていますレクチン、マラリアワクチン候補および融合タンパク質（未発表?...

Watch this Scientific Journal Video about Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts at JoVE.com

Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts

The design-of-experiments procedure presented here allows the evaluation of different flocculants in terms of their ability to aggregate dispersed particles in plant extracts, thus reducing turbidity and the costs of downstream processing.

植物抽出物からの分散粒子の除去のための凝集剤の効率を評価するための手順

Plants are important to humans not only because they provide commodities such as food, feed and raw materials, but increasingly because they can be used ...

procedure-to-evaluate-efficiency-flocculants-for-removal-dispersed

Research

JoVE Journal

Biology

8.8K ビュー.  Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.. The design-of-experiments procedure presented here allows the evaluation of different flocculants in terms of their ability to aggregate dispersed particles in plant extracts, thus reducing turbidity and the costs of downstream processing.

ビデオ: Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts

A Small Volume Procedure for Viral Concentration from Water

Small-scale concentration of viruses (sample volumes 1-10 L, here simulated with spiked 100 ml water samples) is an efficient, cost-effective way to identify optimal parameters for virus concentration. Viruses can be concentrated from water using filtration (electropositive, electronegative, glass wool or size exclusion), followed by secondary concentration with beef extract to release viruses from filter surfaces, and finally tertiary concentration resulting in a 5-30 ml volume virus concentrate. In order to identify optimal concentration procedures, two different electropositive filters were evaluated (a glass/cellulose filter [1MDS] and a nano-alumina/glass filter [NanoCeram]), as well as different secondary concentration techniques; the celite technique where three different celite particle sizes were evaluated (fine, medium and large) followed by comparing this technique with that of the established organic flocculation method. Various elution additives were also evaluated for their ability to enhance the release of adenovirus (AdV) particles from filter surfaces. Fine particle celite recovered similar levels of AdV40 and 41 to that of the established organic flocculation method when viral spikes were added during secondary concentration. The glass/cellulose filter recovered higher levels of both, AdV40 and 41, compared to that of a nano-alumina/glass fiber filter. Although not statistically significant, the addition of 0.1% sodium polyphosphate amended beef extract eluant recovered 10% more AdV particles compared to unamended beef extract.

An approach was developed for identifying optimal viral concentration conditions for small volume water samples using spikes of human adenovirus. The techniques described here are used to identify concentration parameters for other viral targets, and applied to large-scale viral concentration experimentation.

水からのウイルス濃度のため、小容量の手順

Small-scale concentration of viruses (sample volumes 1-10 L, here simulated with spiked 100 ml water samples) is an efficient, cost-effective way to ...

環境学

Extraction and Characterization of Surfactants from Atmospheric Aerosols

Surface-active compounds, or surfactants, present in atmospheric aerosols are expected to play important roles in the formation of liquid water clouds in the Earth&#39;s atmosphere, a central process in meteorology, hydrology, and for the climate system. But because specific extraction and characterization of these compounds have been lacking for decades, very little is known on their identity, properties, mode of action and origins, thus preventing the full understanding of cloud formation and its potential links with the Earth&#39;s ecosystems.
In this paper we present recently developed methods for 1) the targeted extraction of all the surfactants from atmospheric aerosol samples and for the determination of 2) their absolute concentrations in the aerosol phase and 3) their static surface tension curves in water, including their Critical Micelle Concentration (CMC). These methods have been validated with 9 references surfactants, including anionic, cationic and non-ionic ones. Examples of results are presented for surfactants found in fine aerosol particles (diameter &#60;1 &#956;m) collected at a coastal site in Croatia and suggestions for future improvements and other characterizations than those presented are discussed.

Methods are presented for the targeted extraction of surfactants present in atmospheric aerosols and the determination of their absolute concentrations and surface tension curves in water, including their Critical Micelle Concentration (CMC).

大気エアロゾルからの抽出および界面活性剤の特性評価

Surface-active compounds, or surfactants, present in atmospheric aerosols are expected to play important roles in the formation of liquid water clouds in ...

Determination of the Settling Rate of Clay/Cyanobacterial Floccules

The mechanisms underpinning the deposition of fine-grained, organic-rich sediments are still largely debated. Specifically, the impact of the interaction of clay particles with reactive, planktonic cyanobacterial cells to the sedimentary record is under studied. This interaction is a potentially major contributor to shale depositional models. Within a lab setting, the flocculation and sedimentation rates of these materials can be examined and measured in a controlled environment. Here, we detail a protocol for measuring the sedimentation rate of cyanobacterial/clay mixtures. This methodology is demonstrated through the description of two sample experiments: the first uses kaolin (a dehydrated form of kaolinite) and Synechococcus sp. PCC 7002 (a marine coccoid cyanobacteria), and the second uses kaolin and Synechocystis sp. PCC 6803 (a freshwater coccoid cyanobacteria). Cyanobacterial cultures are mixed with varying amounts of clay within a specially designed tank apparatus optimized to allow continuous, real-time video and photographic recording. The sampling procedures are detailed as well as a post-collection protocol for precise measurement of chlorophyll a from which the concentration of cyanobacterial cells remaining in suspension can be determined. Through experimental replication, a profile is constructed that displays sedimentation rate.

The interaction and sedimentation of the clay and bacterial cells within the marine realm, observed in natural environments, can be best investigated in a controlled lab environment. Here, we describe a detailed protocol, which outlines a novel method for measuring the sedimentation rate of clay and cyanobacterial floccules.

Floccules 粘土/シアノ バクテリアの定着率の定量

The mechanisms underpinning the deposition of fine-grained, organic-rich sediments are still largely debated. Specifically, the impact of the interaction ...

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions

Combined size and density fractionation (CSDF) is a method used to physically separate soil into fractions differing in particle size and mineralogy. CSDF relies on sequential density separation and sedimentation steps to isolate (1) the free light fraction (uncomplexed organic matter), (2) the occluded light fraction (uncomplexed organic matter trapped in soil aggregates) and (3) a variable number of heavy fractions (soil minerals and their associated organic matter) differing in composition. Provided that the parameters of the CSDF (dispersion energy, density cut-offs, sedimentation time) are properly selected, the method yields heavy fractions of relatively homogeneous mineral composition. Each of these fractions is expected to have a different complexing ability towards organic matter, rendering this a useful method to isolate and study the nature of organo-mineral interactions. Combining density and particle size separation brings an improved resolution compared to simple size or density fractionation methods, allowing the separation of heavy components according to both mineralogy and size (related to surface area) criteria. As is the case for all physical fractionation methods, it may be considered as less disruptive or aggressive than chemically-based extraction methods. However, CSDF is a time-consuming method and furthermore, the quantity of material obtained in some fractions can be limiting for subsequent analysis. Following CSDF, the fractions may be analyzed for mineralogical composition, soil organic carbon concentration and organic matter chemistry. The method provides quantitative information about organic carbon distribution within a soil sample and brings light to the sorptive capacity of the different, naturally-occurring mineral phases, thus providing mechanistic information about the preferential nature of organo-mineral interactions in soils (i.e., which minerals, what type of organic matter).

Combined size and density fractionation (CSDF) is a method to physically separate soil into fractions differing in texture (particle size) and mineralogy (density). The purpose is to isolate fractions with different reactivities towards soil organic matter (SOM), in order to better understand organo-mineral interactions and SOM dynamics.

合計サイズおよび有機・無機相互作用の調査のための土壌密度分別

Combined size and density fractionation (CSDF) is a method used to physically separate soil into fractions differing in particle size and mineralogy. CSDF ...

Capture of Environmental DNA (eDNA) from Water Samples by Flocculation

The analysis of environmental DNA (eDNA) has become a widely used approach to problem solving in species management. The detection of cryptic species including invasive and (or) species at risk is the goal, typically accomplished by testing water and sediment for the presence of characteristic DNA signatures. Reliable and efficient procedures for the capture of eDNA are required, especially those that can be performed easily in the field by personnel with limited training and citizen scientists. The capture of eDNA using membrane filtration is widely used currently. This approach has inherent issues that include the choice of filter material and porosity, filter fouling, and time required on site for the process to be performed. Flocculation offers an alternative that can be easily implemented and applied to sampling regimes that strive to cover broad territories in limited time.

Capture of Environmental DNA eDNA from Water Samples by Flocculation

Environmental DNA (eDNA) is typically captured from water samples using alcohol precipitation, filtration, or flocculation. Presented here is an alternative protocol that uses lanthanum chloride to enable collection of dissolved and particulate-bound nucleic acids from water samples containing eukaryotic cells, prokaryotic cells, and virus.

The analysis of environmental DNA (eDNA) has become a widely used approach to problem solving in species management. The detection of cryptic species ...

Activated Cross-linked Agarose for the Rapid Development of Affinity Chromatography Resins - Antibody Capture as a Case Study

The purification of monoclonal antibodies (mAbs) is commonly achieved by Protein A affinity chromatography, which can account for up to 25% of the overall process costs. Alternative, cost-effective capture steps are therefore valuable for industrial-scale manufacturing, where large quantities of a single mAb are produced. Here we present a method for the immobilization of a DsRed-based epitope ligand to a cross-linked agarose resin allowing the selective capture of the HIV-neutralizing antibody 2F5 from crude plant extracts without using Protein A. The linear epitope ELDKWA was first genetically fused to the fluorescent protein DsRed and the fusion protein was expressed in transgenic tobacco (Nicotiana tabacum) plants before purification by immobilized metal-ion affinity chromatography. Furthermore, a method based on activated cross-linked agarose was optimized for high ligand density, efficient coupling and low costs. The pH and buffer composition and the soluble ligand concentration were the most important parameters during the coupling procedure, which was improved using a design-of-experiments approach. The resulting affinity resin was tested for its ability to selectively bind the target mAb in a crude plant extract and the elution buffer was optimized for high mAb recovery, product activity and affinity resin stability. The method can easily be adapted to other antibodies with linear epitopes. The new resins allow gentler elution conditions than Protein A and could also reduce the costs of an initial capture step for mAb production.

In this procedure, a DsRed-based epitope ligand is immobilized to produce a highly selective affinity resin for the capture of monoclonal antibodies from crude plant extracts or cell culture supernatants, as an alternative to Protein A.

アフィニティクロマトグラフィー樹脂の急速な発達のための活性化架橋アガロース - ケーススタディとしての抗体捕捉

The purification of monoclonal antibodies (mAbs) is commonly achieved by Protein A affinity chromatography, which can account for up to 25% of the overall ...

生化学

野生ピーナッツ種のアフラトキシン蓄積に対する抵抗性の評価

Non-destructive SPE-UPLC-based Quantification of Aflatoxins and Stilbenoid Phytoalexins in Single Peanut (Arachis spp.) Seeds

Aflatoxins are highly carcinogenic secondary metabolites of some fungal species, particularly Aspergillus flavus. Aflatoxins often contaminate economically important agricultural commodities, including peanuts, posing a high risk to human and animal health. Due to the narrow genetic base, peanut cultivars demonstrate limited resistance to fungal pathogens. Therefore, numerous wild peanut species with tolerance to Aspergillus have received substantial consideration by scientists as sources of disease resistance.
Exploring plant germplasm for resistance to aflatoxins is difficult since aflatoxin accumulation does not follow a normal distribution, which dictates the need for the analyses of thousands of single peanut seeds. Sufficiently hydrated peanut (Arachis spp.) seeds, when infected by Aspergillus species, are capable of producing biologically active stilbenes&#160;(stilbenoids) that are considered defensive phytoalexins. Peanut stilbenes inhibit fungal development and aflatoxin production. Therefore, it is crucial to analyze the same seeds for peanut stilbenoids to explain the nature of seed resistance/susceptibility to the Aspergillus invasion. None of the published methods offer single-seed analyses for aflatoxins and/or stilbene phytoalexins.
We attempted to fulfill the demand for such a method that is environment-friendly, uses inexpensive consumables, and is sensitive and selective. In addition, the method is non-destructive since it uses only half of the seed and leaves the other half containing the embryonic axis intact. Such a technique allows germination and growth of the peanut plant to full maturity from the same seed used for the aflatoxin and stilbenoid analysis. The integrated part of this method, the manual challenging of the seeds with Aspergillus, is a limiting step that requires more time and labor compared to other steps in the method. The method has been used for the exploration of wild Arachis germplasm to identify species resistant to Aspergillus and to determine and characterize novel sources of genetic resistance to this fungal pathogen.

著者スポットライト:アスペルギルス菌に対する遺伝的耐性を特定するためのピーナッツ種子中のアフラトキシンとフィトアレキシンの定量化

We demonstrate a medium-throughput method for quantification of aflatoxins and stilbenoid phytoalexins in single peanut seeds using ultra performance liquid chromatography. This method was specifically developed for the analyses of wild Arachis species challenged by the aflatoxigenic Aspergillus species.

SPE-UPLC による 1 つのピーナッツ中のアフラトキシンおよびスチルベノイド植物アレキシンの非破壊定量(英語 )種子

Aflatoxins are highly carcinogenic secondary metabolites of some fungal species, particularly Aspergillus flavus. Aflatoxins often contaminate ...

Comparison of Tobacco Host Cell Protein Removal Methods by Blanching Intact Plants or by Heat Treatment of Extracts

Plants not only provide food, feed and raw materials for humans, but have also been developed as an economical production system for biopharmaceutical proteins, such as antibodies, vaccine candidates and enzymes. These must be purified from the plant biomass but chromatography steps are hindered by the high concentrations of host cell proteins (HCPs) in plant extracts. However, most HCPs irreversibly aggregate at temperatures above 60 &#176;C facilitating subsequent purification of the target protein. Here, three methods are presented to achieve the heat precipitation of tobacco HCPs in either intact leaves or extracts. The blanching of intact leaves can easily be incorporated into existing processes but may have a negative impact on subsequent filtration steps. The opposite is true for heat precipitation of leaf extracts in a stirred vessel, which can improve the performance of downstream operations albeit with major changes in process equipment design, such as homogenizer geometry. Finally, a heat exchanger setup is well characterized in terms of heat transfer conditions and easy to scale, but cleaning can be difficult and there may be a negative impact on filter capacity. The design-of-experiments approach can be used to identify the most relevant process parameters affecting HCP removal and product recovery. This facilitates the application of each method in other expression platforms and the identification of the most suitable method for a given purification strategy.

Three heat precipitation methods are presented that effectively remove more than 90% of host cell proteins (HCPs) from tobacco extracts prior to any other purification step. The plant HCPs irreversibly aggregate at temperatures above 60 &#176;C.

無傷の植物をブランチングすることによって、または抽出物の熱処理によりタバコ宿主細胞タンパク質の除去方法の比較

Plants not only provide food, feed and raw materials for humans, but have also been developed as an economical production system for biopharmaceutical ...

植物抽出物からの分散粒子の除去のための凝集剤の効率を評価するための手順

要約

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水からのウイルス濃度のため、小容量の手順

大気エアロゾルからの抽出および界面活性剤の特性評価

Floccules 粘土/シアノバクテリアの定着率の定量

合計サイズおよび有機・無機相互作用の調査のための土壌密度分別

Capture of Environmental DNA (eDNA) from Water Samples by Flocculation

アフィニティクロマトグラフィー樹脂の急速な発達のための活性化架橋アガロース - ケーススタディとしての抗体捕捉

SPE-UPLC による 1 つのピーナッツ中のアフラトキシンおよびスチルベノイド植物アレキシンの非破壊定量(英語 )種子

SPE-UPLC による 1 つのピーナッツ中のアフラトキシンおよびスチルベノイド植物アレキシンの非破壊定量(英語 )種子

SPE-UPLC による 1 つのピーナッツ中のアフラトキシンおよびスチルベノイド植物アレキシンの非破壊定量(英語 )種子

無傷の植物をブランチングすることによって、または抽出物の熱処理によりタバコ宿主細胞タンパク質の除去方法の比較

植物抽出物からの分散粒子の除去のための凝集剤の効率を評価するための手順

要約

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水からのウイルス濃度のため、小容量の手順

大気エアロゾルからの抽出および界面活性剤の特性評価

Floccules 粘土/シアノ バクテリアの定着率の定量

合計サイズおよび有機・無機相互作用の調査のための土壌密度分別

Capture of Environmental DNA (eDNA) from Water Samples by Flocculation

アフィニティクロマトグラフィー樹脂の急速な発達のための活性化架橋アガロース - ケーススタディとしての抗体捕捉

SPE-UPLC による 1 つのピーナッツ中のアフラトキシンおよびスチルベノイド植物アレキシンの非破壊定量(英語 )種子

SPE-UPLC による 1 つのピーナッツ中のアフラトキシンおよびスチルベノイド植物アレキシンの非破壊定量(英語 )種子

SPE-UPLC による 1 つのピーナッツ中のアフラトキシンおよびスチルベノイド植物アレキシンの非破壊定量(英語 )種子

無傷の植物をブランチングすることによって、または抽出物の熱処理によりタバコ宿主細胞タンパク質の除去方法の比較

Floccules 粘土/シアノバクテリアの定着率の定量