• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SU1804464A3
    申请号:SU884356051
    申请日:1988-06-16
    公开日:1993-03-23
    发明作者:Sko-Brek Gudmund；Tryugve Eklund；Ove Fon Khusbyu Kurt；Jokhannes Kvam Berne；Smidsred Olav
    申请人:Protan As；
    IPC主号:
    专利说明:

    The invention relates to a method for modifying alginate and polymannuronic acid, which are used as thickening agents and for binding water and polyvalent metal ions.
    The purpose of the invention is the simplification of technology.
    Example 1. Sodium alginate (50 g) isolated from Laminaria hyperborea was placed in a steel column and treated with carbon dioxide (dioxide) under supercritical conditions. The pressure is varied in the range of 150-500 bar. The gas flow rate was 0.5-10 ml / min, the temperature was 45 ° C and the treatment time was 12 hours. Material losses were less than 1% in all experiments. The polymer composition was determined by high-frequency (400 MHz) 1 H FMR spectroscopy and is presented in table. 1 in the form of molar fractions of two monomer units M and G in the form of Fm and Fg, respectively, where Fm + Fg, and in the form of sequence parameters or fractions of the four nearest adjacent sequences - MM, GG, Mg and Gm, where Fmm + Fgg + 2Fmg = 1. a
    The data presented in table. 1 show that carbon dioxide treatment achieved a significant increase in guluronate at three different pressures. The content expressed by FG varied from 0.52 (i.e. 52%) in the untreated material to 0.60, 0.64 and 0.66 after treatment. The maximum pressure (500 bar) caused the greatest * change in composition.
    Such an increase in the content of G caused in alginates an increase in the ability to form gels with polyvalent ions.
    In the table. 2 shows some physical properties of carbon dioxide-treated polymers. The viscosity was determined using a Brookfield viscometer, and the intrinsic viscosity (η) was determined using a capillary viscose
    1804464AZ meter Canno - Ubellode. The gel strengths of 1% calcium alginate were determined in a FIPA instrument to determine gel strength, and the transverse elasticity modulus in 2% homogeneous calcium gels was determined by the Stevens analyzer.
    The treatment with carbon dioxide decreases the intrinsic viscosity, apparently due to hydrolytic rupture of glycosidic bonds. But limited decomposition does not affect the gel-forming properties of alginates. The gel strength, expressed both in the FIRA values and in the values of the transverse elastic modulus, increases significantly and reaches values comparable to those obtained for most strong gelling alginates.
    Example 2. The sodium salt of polymannuronic acid, isolated from Ascophyllum nodosum, is treated with carbon dioxide for 12 hours at supercritical parameters: pressure 200 bar and temperature 45 ° C. Losses less than 0.5%. The content of guluronates in the polymer increases from 5 to 16% (see FIG. 2) 4 : From the spectra it is seen that the D-mannuronate of the unaffected polymer is C-5 epimerized under these conditions. In FIG. 1 shows 1 H NMR spectra (400 MHz) of sodium alginate from thalli L hyperborea. A - thallium sodium alginate
    L.hyperborea treated with carbon dioxide at supercritical parameters for 12 hours at a pressure of 500 bar and a temperature of 45 ° C. B - untreated alginate. The change in the G content in the modified polymer is shown by a relative increase in the intensity of G-signals (I and III) compared to M-signals (II); in FIG. 2 - 1 H NMR spectrum (400 MHz) of sodium polymannuronate isolated from A. nodosum. A - treated with carbon dioxide under supercritical conditions for 12 hours at a pressure of 200 bar (FG = 0.16); B - untreated poly-M (FG <0.05).
    Signal 1 in the spectrum corresponds to the content of L-guluronate.
    The process on which the method is based is economically viable for the following reasons; it can be carried out with the substance in the solid state; its implementation does not require toxic or flammable chemicals and, therefore, does not require product cleaning; the process can be carried out on a large scale, since the technology of fluid extraction of supercritical parameters has already been developed for other purposes.
    权利要求:
    Claims (2)
    [1]
    Claim
    A method for modifying alginate and polymannuronic acid, characterized in that, in order to simplify the technology, they are treated with carbon dioxide, which is in a supercritical state under a pressure of 150-500 bar.
    Table!
    Sequence Parameters for Treated SOG Alginate Sodium Fg Fm Fgg Fgm Fmm Untreated sample 0.52 0.48 0.34 0.18 0.30 150 bar 0.60 0.40 0.50 0.10 0.30 250 bar 0.64 0.36 0.55 0.09 0.27 500 bar 0.66 '0.34 0.53 0.13 0.27
    Table 2
    Physical properties of the treated CO alginate sodium
    Viscosity in water (1%), MPa s Intrinsic viscosity, 7, l / g Gel strength FIRA 1% Sagel, ml Elastic modulus 2% Sagel, N / cm x Untreated sample 205 8.8 40 6.2 150 bar 80.6 6.9 63 250 bar 86.2 6.8 63.5 - 500 bar __ 80.7 6.9 63.5 9.0
    FIG.
    [2]
    2 PPM.
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    同族专利:
    公开号 | 公开日
    EP0288494B1|1993-05-05|
    PH23281A|1989-06-23|
    AU604070B2|1990-12-06|
    WO1988002758A1|1988-04-21|
    NO160374C|1989-04-12|
    ES2007422A6|1989-06-16|
    FI882884A|1988-06-16|
    BR8707509A|1989-02-21|
    MW2488A1|1989-02-08|
    KR880701738A|1988-11-04|
    EP0288494A1|1988-11-02|
    NO160374B|1989-01-02|
    HU202251B|1991-02-28|
    MC1937A1|1989-05-19|
    IL84177A|1992-11-15|
    DE3785754D1|1993-06-09|
    DE3785754T2|1994-01-05|
    NO864147L|1988-04-18|
    NZ222182A|1990-06-26|
    HUT52118A|1990-06-28|
    IL84177D0|1988-03-31|
    RO104348B1|1993-04-25|
    AU8074987A|1988-05-06|
    DK330688A|1988-06-16|
    DK330688D0|1988-06-16|
    AT89008T|1993-05-15|
    JPH01501316A|1989-05-11|
    NO864147D0|1986-10-17|
    FI882884A0|1988-06-16|
    US4990601A|1991-02-05|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    NO864147A|NO160374C|1986-10-17|1986-10-17|PROCEDURE FOR MODIFICATION OF ALGINATESTO GET CHANGED PHYSICAL PROPERTIES.|
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