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Annsofi Jonsson - One of the best experts on this subject based on the ideXlab platform.

  • Enzymatic Treatment of hemicelluloses and lignin isolated from thermomechanical pulp mill process water
    Chemical Engineering Journal, 2016
    Co-Authors: Johan Thuvander, Petri Oinonen, Annsofi Jonsson
    Abstract:

    Hemicelluloses dissolved in thermomechanical pulp (TMP) mill process streams can be used to manufacture high-value-added products. The molecular mass of the dissolved hemicelluloses is about 10 kDa. In some applications, it would be beneficial with larger molecules. It was therefore investigated whether it is possible to increase the size of hemicelluloses isolated by microfiltration and ultrafiltration from TMP process water using Enzymatic Treatment with laccase. No significant increase of the size of hemicelluloses was achieved, probably due to only a small percentage of lignin carbohydrate complexes in the process water. The molecular mass of lignin increased however markedly from a peak molecular mass of 1 kDa to about 60 kDa. Diafiltration was used to purify large molecules after the Enzymatic Treatment. Low-molecular-mass sugar and lignin molecules in the diafiltration permeate were concentrated by nanofiltration. The retention of sugars and lignin was about 98% during nanofiltration to a volume reduction of 80%. Average flux during nanofiltration was 49 l/m2 h.

  • combined membrane filtration and Enzymatic Treatment for recovery of high molecular mass hemicelluloses from chemithermomechanical pulp process water
    Chemical Engineering Journal, 2013
    Co-Authors: Holger Krawczyk, Petri Oinonen, Annsofi Jonsson
    Abstract:

    Hemicelluloses with high molecular mass are needed for the manufacture of value added products such as food packaging barrier films. In this work such molecules were recovered from chemithermomechanical pulp (CTMP) process water using an innovative three-stage process comprising membrane separation and Enzymatic Treatment with laccase. Microfiltration followed by ultrafiltration was found to be a suitable combination in the first stage, providing a concentrated and purified hemicellulose fraction suitable for Enzymatic Treatment. In both membrane processes a high average flux (260 and 115 l/m2 h) and a low fouling tendency were observed. A marked increase in the average molecular mass of hemicelluloses with bound lignin moieties was achieved by laccase Treatment in the second stage. The Enzymatically crosslinked hemicelluloses were finally recovered in the third stage using ultrafiltration. In the final high molecular mass solution the hemicellulose concentration was 54 g/l, the contribution of hemicelluloses to the total solids content 43%, and the viscosity of the solution 27 mPa s. The results demonstrate that a hemicellulose fraction of high quality can be produced from CTMP process water, and that this could constitute a suitable feedstock for the production of, for example, barrier films for renewable packaging.

Saerom Park - One of the best experts on this subject based on the ideXlab platform.

  • Combined effect of corona discharge and Enzymatic Treatment on the mechanical and surface properties of wool
    Journal of Industrial and Engineering Chemistry, 2014
    Co-Authors: Mira Park, Sang-hyun Lee, Fan-long Jin, Heung Soap Choi, H Y Kim, Saerom Park
    Abstract:

    The Enzymatic Treatment of textile fibers is a nontoxic and environmentally benign process. The objective of the present study is to investigate the improvement of physic-chemical characteristics of wool fabrics by surface modification induced by corona discharge and Enzymatic Treatment with protease and cellulose. Thus, it was found that, compared with pristine wool fabric, the enzyme-treated fabrics exhibited lower tensile strength, increased elongation, and higher alkali solubility. The surface roughness and the zeta potential of the enzyme-treated wool fabrics decreased with increasing Treatment duration.

Mauricio Moura Silveira - One of the best experts on this subject based on the ideXlab platform.

  • use of pectinases produced by a new strain of aspergillus niger for the Enzymatic Treatment of apple and blueberry juice
    Lwt - Food Science and Technology, 2013
    Co-Authors: Ivana Greice Sandri, Cristiane Menegoto Toscan Lorenzoni, Roselei Claudete Fontana, Mauricio Moura Silveira
    Abstract:

    Abstract In this work, pectinases-producing filamentous fungi were isolated with the aim of using their enzymes in the clarification of apple and blueberry juices. The experimental extract enzyme EE obtained in solid-state process with a strain identified as belonging to the species Aspergillus niger and designated LB23 was used for treating juices and compared with two commercial enzyme preparations: Pectinex ® Clear (PC) for apple juice, and Pectinex ® BE Color (PB) for blueberry juice. After the Enzymatic Treatment, the treated juices were evaluated with respect to parameters such as viscosity, turbidity, and degree of clarification, as well as antioxidant capacity, and total phenolic compound content. Considering all comparison criteria, the experimental preparation EE showed results statistically similar or superior to those obtained with the commercial enzyme preparations.

  • Use of pectinases produced by a new strain of Aspergillus niger for the Enzymatic Treatment of apple and blueberry juice
    LWT - Food Science and Technology, 2013
    Co-Authors: Ivana Greice Sandri, Cristiane Menegoto Toscan Lorenzoni, Roselei Claudete Fontana, Mauricio Moura Silveira
    Abstract:

    In this work, pectinases-producing filamentous fungi were isolated with the aim of using their enzymes in the clarification of apple and blueberry juices. The experimental extract enzyme EE obtained in solid-state process with a strain identified as belonging to the species Aspergillus niger and designated LB23 was used for treating juices and compared with two commercial enzyme preparations: Pectinex??Clear (PC) for apple juice, and Pectinex??BE Color (PB) for blueberry juice. After the Enzymatic Treatment, the treated juices were evaluated with respect to parameters such as viscosity, turbidity, and degree of clarification, as well as antioxidant capacity, and total phenolic compound content. Considering all comparison criteria, the experimental preparation EE showed results statistically similar or superior to those obtained with the commercial enzyme preparations. ?? 2013 Elsevier Ltd.

Holger Krawczyk - One of the best experts on this subject based on the ideXlab platform.

  • combined membrane filtration and Enzymatic Treatment for recovery of high molecular mass hemicelluloses from chemithermomechanical pulp process water
    Chemical Engineering Journal, 2013
    Co-Authors: Holger Krawczyk, Petri Oinonen, Annsofi Jonsson
    Abstract:

    Hemicelluloses with high molecular mass are needed for the manufacture of value added products such as food packaging barrier films. In this work such molecules were recovered from chemithermomechanical pulp (CTMP) process water using an innovative three-stage process comprising membrane separation and Enzymatic Treatment with laccase. Microfiltration followed by ultrafiltration was found to be a suitable combination in the first stage, providing a concentrated and purified hemicellulose fraction suitable for Enzymatic Treatment. In both membrane processes a high average flux (260 and 115 l/m2 h) and a low fouling tendency were observed. A marked increase in the average molecular mass of hemicelluloses with bound lignin moieties was achieved by laccase Treatment in the second stage. The Enzymatically crosslinked hemicelluloses were finally recovered in the third stage using ultrafiltration. In the final high molecular mass solution the hemicellulose concentration was 54 g/l, the contribution of hemicelluloses to the total solids content 43%, and the viscosity of the solution 27 mPa s. The results demonstrate that a hemicellulose fraction of high quality can be produced from CTMP process water, and that this could constitute a suitable feedstock for the production of, for example, barrier films for renewable packaging.

Petri Oinonen - One of the best experts on this subject based on the ideXlab platform.

  • Enzymatic Treatment of hemicelluloses and lignin isolated from thermomechanical pulp mill process water
    Chemical Engineering Journal, 2016
    Co-Authors: Johan Thuvander, Petri Oinonen, Annsofi Jonsson
    Abstract:

    Hemicelluloses dissolved in thermomechanical pulp (TMP) mill process streams can be used to manufacture high-value-added products. The molecular mass of the dissolved hemicelluloses is about 10 kDa. In some applications, it would be beneficial with larger molecules. It was therefore investigated whether it is possible to increase the size of hemicelluloses isolated by microfiltration and ultrafiltration from TMP process water using Enzymatic Treatment with laccase. No significant increase of the size of hemicelluloses was achieved, probably due to only a small percentage of lignin carbohydrate complexes in the process water. The molecular mass of lignin increased however markedly from a peak molecular mass of 1 kDa to about 60 kDa. Diafiltration was used to purify large molecules after the Enzymatic Treatment. Low-molecular-mass sugar and lignin molecules in the diafiltration permeate were concentrated by nanofiltration. The retention of sugars and lignin was about 98% during nanofiltration to a volume reduction of 80%. Average flux during nanofiltration was 49 l/m2 h.

  • combined membrane filtration and Enzymatic Treatment for recovery of high molecular mass hemicelluloses from chemithermomechanical pulp process water
    Chemical Engineering Journal, 2013
    Co-Authors: Holger Krawczyk, Petri Oinonen, Annsofi Jonsson
    Abstract:

    Hemicelluloses with high molecular mass are needed for the manufacture of value added products such as food packaging barrier films. In this work such molecules were recovered from chemithermomechanical pulp (CTMP) process water using an innovative three-stage process comprising membrane separation and Enzymatic Treatment with laccase. Microfiltration followed by ultrafiltration was found to be a suitable combination in the first stage, providing a concentrated and purified hemicellulose fraction suitable for Enzymatic Treatment. In both membrane processes a high average flux (260 and 115 l/m2 h) and a low fouling tendency were observed. A marked increase in the average molecular mass of hemicelluloses with bound lignin moieties was achieved by laccase Treatment in the second stage. The Enzymatically crosslinked hemicelluloses were finally recovered in the third stage using ultrafiltration. In the final high molecular mass solution the hemicellulose concentration was 54 g/l, the contribution of hemicelluloses to the total solids content 43%, and the viscosity of the solution 27 mPa s. The results demonstrate that a hemicellulose fraction of high quality can be produced from CTMP process water, and that this could constitute a suitable feedstock for the production of, for example, barrier films for renewable packaging.