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Acidic Precipitation

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Peter Eisner – One of the best experts on this subject based on the ideXlab platform.

  • rapeseed protein concentrates for non food applications prepared from pre pressed and cold pressed press cake via Acidic Precipitation and ultrafiltration
    Industrial Crops and Products, 2019
    Co-Authors: Andreas Fetzer, Peter Eisner, Thomas Herfellner
    Abstract:

    Abstract Rapeseed protein concentrates (RPCs), prepared from residual press-cakes, show excellent techno-functional properties, such as emulsification and foaming. However, food application is hindered by residual contents of anti-nutritive components. Limited research has been invested in studying RPCs as a potential ingredient in non-food applications. The present study reports RPC preparation from cold-pressed rapeseed meal (CPM) and pre-pressed rapeseed meal (PPM) as a potential ingredient for the chemical industry. Protein isolation was achieved after extraction at pH 5.7–7.0 via i) ultrafiltration or ii) a combination of Acidic Precipitation followed by ultrafiltration. Protein isolation yields obtained from CPM (36.5%–40.6%) were 60%–90% higher compared to PPM (19.4%–26.0%), highlighting the positive effect of low-temperature processing during defatting. Protein contents of RPCs were 75.3%–87.1% and were highest for preparations obtained through Precipitation. RPCs obtained through ultrafiltration showed good solubility properties and very high values for emulsifying capacity (688–768 mL/g) as well as foaming activity (1834%–2834%). In contrast, precipitated RPCs showed lower functional values (410–445 mL/g, 888%–938%, respectively). All RPCs had excellent film-forming properties in cast-film experiments. Thus, RPCs are promising ingredients for industrial non-food applications such as adhesives, detergents, paints, varnishes and biodegradable polymers.

Andreas Fetzer – One of the best experts on this subject based on the ideXlab platform.

  • rapeseed protein concentrates for non food applications prepared from pre pressed and cold pressed press cake via Acidic Precipitation and ultrafiltration
    Industrial Crops and Products, 2019
    Co-Authors: Andreas Fetzer, Peter Eisner, Thomas Herfellner
    Abstract:

    Abstract Rapeseed protein concentrates (RPCs), prepared from residual press-cakes, show excellent techno-functional properties, such as emulsification and foaming. However, food application is hindered by residual contents of anti-nutritive components. Limited research has been invested in studying RPCs as a potential ingredient in non-food applications. The present study reports RPC preparation from cold-pressed rapeseed meal (CPM) and pre-pressed rapeseed meal (PPM) as a potential ingredient for the chemical industry. Protein isolation was achieved after extraction at pH 5.7–7.0 via i) ultrafiltration or ii) a combination of Acidic Precipitation followed by ultrafiltration. Protein isolation yields obtained from CPM (36.5%–40.6%) were 60%–90% higher compared to PPM (19.4%–26.0%), highlighting the positive effect of low-temperature processing during defatting. Protein contents of RPCs were 75.3%–87.1% and were highest for preparations obtained through Precipitation. RPCs obtained through ultrafiltration showed good solubility properties and very high values for emulsifying capacity (688–768 mL/g) as well as foaming activity (1834%–2834%). In contrast, precipitated RPCs showed lower functional values (410–445 mL/g, 888%–938%, respectively). All RPCs had excellent film-forming properties in cast-film experiments. Thus, RPCs are promising ingredients for industrial non-food applications such as adhesives, detergents, paints, varnishes and biodegradable polymers.

Jon Kristian Skei – One of the best experts on this subject based on the ideXlab platform.

  • Amphibian recovery after a decrease in Acidic Precipitation
    Ambio, 2018
    Co-Authors: Dag Dolmen, Anders Gravbrøt Finstad, Jon Kristian Skei
    Abstract:

    We here report the first sign of amphibian recovery after a strong decline due to Acidic Precipitation over many decades and peaking around 1980–90. In 2010, the pH level of ponds and small lakes in two heavily acidified areas in southwestern Scandinavia (Aust-Agder and Østfold in Norway) had risen significantly at an (arithmetic) average of 0.14 since 1988–89. Parallel with the general rise in pH, amphibians ( Rana temporaria , R. arvalis , Bufo bufo , Lissotriton vulgaris , and Triturus cristatus ) had become significantly more common: the frequency of amphibian localities rose from 33% to 49% ( n  = 115), and the average number of amphibian species per locality had risen from 0.51 to 0.88. In two other (reference) areas, one with better buffering capacity (Telemark, n  = 21) and the other with much less input of Acidic Precipitation (Nord-Trøndelag, n  = 106), there were no significant changes in pH or amphibians.