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Biochemical Properties of α-Amylase from Peel of Citrus sinensis cv. Abosora

Identifieur interne : 000758 ( PascalFrancis/Curation ); précédent : 000757; suivant : 000759

Biochemical Properties of α-Amylase from Peel of Citrus sinensis cv. Abosora

Auteurs : SALEH AHMED MOHAMED [Égypte] ; Ehab A. Drees [Égypte] ; Mohamed O. El-Badry [Égypte] ; Afaf S. Fahmy [Égypte]

Source :

RBID : Pascal:10-0270833

Descripteurs français

English descriptors

Abstract

-Amylase activity was screened in the peel, as waste fruit, of 13 species and cultivars of Egyptian citrus. The species Citrus sirzensis cv. Abosora had the highest activity. α-Amylase Al from Abosora peel was purified to homogeneity using anion and cation-exchange, and gel filtration chromatographies. Molecular weight of α-amylase Al was found to be 42 kDa. The hydrolysis properties of α-amylase Al toward different substrates indicated that corn starch is the best substrate. The α-amylase had the highest activity toward glycogen compared with amylopectin and dextrin. Potato starch had low affinity toward α-amylase Al but it did not hydrolyze β-cyclodextrin and dextran. Apparent Km for α-amylase Al was 5 mg (0.5%) starch/ml. α-Amylase Al showed optimum activity at pH 5.6 and 40 °C. The enzyme was thermally stable up to 40 °C and inactivated at 70 °C. The effect of mono and divalent metal ions were tested for the α-amylase Al. Ba2+ was found to have activating effect, where as Li+ had negligible effect on activity. The other metals caused inhibition effect. Activity of the α-amylase Al was increased one and half in the presence of 4 mM Ca2+ and was found to be partially inactivated at 10 mM Ca2+. The reduction of starch viscosity indicated that the enzyme is endoamylase. The results suggested that, in addition to citrus peel is a rich source of pectins and flavanoids, α-amylase Al from orange peel could be involved in the development and ripening of citrus fruit and may be used for juice processing.
pA  
A01 01  1    @0 0273-2289
A02 01      @0 ABIBDL
A03   1    @0 Appl. biochem. biotechnol.
A05       @2 160
A06       @2 7
A08 01  1  ENG  @1 Biochemical Properties of α-Amylase from Peel of Citrus sinensis cv. Abosora
A11 01  1    @1 SALEH AHMED MOHAMED
A11 02  1    @1 DREES (Ehab A.)
A11 03  1    @1 EL-BADRY (Mohamed O.)
A11 04  1    @1 FAHMY (Afaf S.)
A14 01      @1 Molecular Biology Department, National Research Center @2 Dokki. Cairo @3 EGY @Z 1 aut. @Z 3 aut. @Z 4 aut.
A14 02      @1 Biochemistry division, Chemistry Department, Faculty of Science, Fayoum University @2 Fayoum @3 EGY @Z 2 aut.
A20       @1 2054-2065
A21       @1 2010
A23 01      @0 ENG
A43 01      @1 INIST @2 17423 @5 354000181751000190
A44       @0 0000 @1 © 2010 INIST-CNRS. All rights reserved.
A45       @0 32 ref.
A47 01  1    @0 10-0270833
A60       @1 P
A61       @0 A
A64 01  1    @0 Applied biochemistry and biotechnology
A66 01      @0 DEU
C01 01    ENG  @0 <is proportional to>-Amylase activity was screened in the peel, as waste fruit, of 13 species and cultivars of Egyptian citrus. The species Citrus sirzensis cv. Abosora had the highest activity. α-Amylase Al from Abosora peel was purified to homogeneity using anion and cation-exchange, and gel filtration chromatographies. Molecular weight of α-amylase Al was found to be 42 kDa. The hydrolysis properties of α-amylase Al toward different substrates indicated that corn starch is the best substrate. The α-amylase had the highest activity toward glycogen compared with amylopectin and dextrin. Potato starch had low affinity toward α-amylase Al but it did not hydrolyze β-cyclodextrin and dextran. Apparent Km for α-amylase Al was 5 mg (0.5%) starch/ml. α-Amylase Al showed optimum activity at pH 5.6 and 40 °C. The enzyme was thermally stable up to 40 °C and inactivated at 70 °C. The effect of mono and divalent metal ions were tested for the α-amylase Al. Ba2+ was found to have activating effect, where as Li+ had negligible effect on activity. The other metals caused inhibition effect. Activity of the α-amylase Al was increased one and half in the presence of 4 mM Ca2+ and was found to be partially inactivated at 10 mM Ca2+. The reduction of starch viscosity indicated that the enzyme is endoamylase. The results suggested that, in addition to citrus peel is a rich source of pectins and flavanoids, α-amylase Al from orange peel could be involved in the development and ripening of citrus fruit and may be used for juice processing.
C02 01  X    @0 002A31
C02 02  X    @0 215
C03 01  X  FRE  @0 α-Amylase @2 FE @5 01
C03 01  X  ENG  @0 α-Amylase @2 FE @5 01
C03 01  X  SPA  @0 α-Amylase @2 FE @5 01
C03 02  X  FRE  @0 Purification @5 02
C03 02  X  ENG  @0 Purification @5 02
C03 02  X  SPA  @0 Purificación @5 02
C03 03  X  FRE  @0 Citrus sinensis @2 NS @5 13
C03 03  X  ENG  @0 Citrus sinensis @2 NS @5 13
C03 03  X  SPA  @0 Citrus sinensis @2 NS @5 13
C07 01  X  FRE  @0 Glycosidases @2 FE
C07 01  X  ENG  @0 Glycosidases @2 FE
C07 01  X  SPA  @0 Glycosidases @2 FE
C07 02  X  FRE  @0 Glycosylases @2 FE
C07 02  X  ENG  @0 Glycosylases @2 FE
C07 02  X  SPA  @0 Glycosylases @2 FE
C07 03  X  FRE  @0 Hydrolases @2 FE
C07 03  X  ENG  @0 Hydrolases @2 FE
C07 03  X  SPA  @0 Hydrolases @2 FE
C07 04  X  FRE  @0 Enzyme @2 FE
C07 04  X  ENG  @0 Enzyme @2 FE
C07 04  X  SPA  @0 Enzima @2 FE
C07 05  X  FRE  @0 Rutaceae @2 NS
C07 05  X  ENG  @0 Rutaceae @2 NS
C07 05  X  SPA  @0 Rutaceae @2 NS
C07 06  X  FRE  @0 Dicotyledones @2 NS
C07 06  X  ENG  @0 Dicotyledones @2 NS
C07 06  X  SPA  @0 Dicotyledones @2 NS
C07 07  X  FRE  @0 Angiospermae @2 NS
C07 07  X  ENG  @0 Angiospermae @2 NS
C07 07  X  SPA  @0 Angiospermae @2 NS
C07 08  X  FRE  @0 Spermatophyta @2 NS
C07 08  X  ENG  @0 Spermatophyta @2 NS
C07 08  X  SPA  @0 Spermatophyta @2 NS
N21       @1 172
N44 01      @1 OTO
N82       @1 OTO

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Pascal:10-0270833

Le document en format XML

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<div type="abstract" xml:lang="en">-Amylase activity was screened in the peel, as waste fruit, of 13 species and cultivars of Egyptian citrus. The species Citrus sirzensis cv. Abosora had the highest activity. α-Amylase Al from Abosora peel was purified to homogeneity using anion and cation-exchange, and gel filtration chromatographies. Molecular weight of α-amylase Al was found to be 42 kDa. The hydrolysis properties of α-amylase Al toward different substrates indicated that corn starch is the best substrate. The α-amylase had the highest activity toward glycogen compared with amylopectin and dextrin. Potato starch had low affinity toward α-amylase Al but it did not hydrolyze β-cyclodextrin and dextran. Apparent Km for α-amylase Al was 5 mg (0.5%) starch/ml. α-Amylase Al showed optimum activity at pH 5.6 and 40 °C. The enzyme was thermally stable up to 40 °C and inactivated at 70 °C. The effect of mono and divalent metal ions were tested for the α-amylase Al. Ba
<sup>2+</sup>
was found to have activating effect, where as Li
<sup>+</sup>
had negligible effect on activity. The other metals caused inhibition effect. Activity of the α-amylase Al was increased one and half in the presence of 4 mM Ca
<sup>2+</sup>
and was found to be partially inactivated at 10 mM Ca
<sup>2+</sup>
. The reduction of starch viscosity indicated that the enzyme is endoamylase. The results suggested that, in addition to citrus peel is a rich source of pectins and flavanoids, α-amylase Al from orange peel could be involved in the development and ripening of citrus fruit and may be used for juice processing.</div>
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<s0>-Amylase activity was screened in the peel, as waste fruit, of 13 species and cultivars of Egyptian citrus. The species Citrus sirzensis cv. Abosora had the highest activity. α-Amylase Al from Abosora peel was purified to homogeneity using anion and cation-exchange, and gel filtration chromatographies. Molecular weight of α-amylase Al was found to be 42 kDa. The hydrolysis properties of α-amylase Al toward different substrates indicated that corn starch is the best substrate. The α-amylase had the highest activity toward glycogen compared with amylopectin and dextrin. Potato starch had low affinity toward α-amylase Al but it did not hydrolyze β-cyclodextrin and dextran. Apparent Km for α-amylase Al was 5 mg (0.5%) starch/ml. α-Amylase Al showed optimum activity at pH 5.6 and 40 °C. The enzyme was thermally stable up to 40 °C and inactivated at 70 °C. The effect of mono and divalent metal ions were tested for the α-amylase Al. Ba
<sup>2+</sup>
was found to have activating effect, where as Li
<sup>+</sup>
had negligible effect on activity. The other metals caused inhibition effect. Activity of the α-amylase Al was increased one and half in the presence of 4 mM Ca
<sup>2+</sup>
and was found to be partially inactivated at 10 mM Ca
<sup>2+</sup>
. The reduction of starch viscosity indicated that the enzyme is endoamylase. The results suggested that, in addition to citrus peel is a rich source of pectins and flavanoids, α-amylase Al from orange peel could be involved in the development and ripening of citrus fruit and may be used for juice processing.</s0>
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<fC02 i1="02" i2="X">
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<s0>α-Amylase</s0>
<s2>FE</s2>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG">
<s0>α-Amylase</s0>
<s2>FE</s2>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA">
<s0>α-Amylase</s0>
<s2>FE</s2>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE">
<s0>Purification</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG">
<s0>Purification</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA">
<s0>Purificación</s0>
<s5>02</s5>
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<fC03 i1="03" i2="X" l="FRE">
<s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>13</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG">
<s0>Citrus sinensis</s0>
<s2>NS</s2>
<s5>13</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA">
<s0>Citrus sinensis</s0>
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<fC07 i1="01" i2="X" l="SPA">
<s0>Glycosidases</s0>
<s2>FE</s2>
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<s0>Glycosylases</s0>
<s2>FE</s2>
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<s0>Glycosylases</s0>
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<s0>Hydrolases</s0>
<s2>FE</s2>
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<fC07 i1="03" i2="X" l="SPA">
<s0>Hydrolases</s0>
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<s0>Enzyme</s0>
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<s0>Enzima</s0>
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<s0>Rutaceae</s0>
<s2>NS</s2>
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<fC07 i1="05" i2="X" l="ENG">
<s0>Rutaceae</s0>
<s2>NS</s2>
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<fC07 i1="05" i2="X" l="SPA">
<s0>Rutaceae</s0>
<s2>NS</s2>
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<s0>Dicotyledones</s0>
<s2>NS</s2>
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<s0>Dicotyledones</s0>
<s2>NS</s2>
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<fC07 i1="06" i2="X" l="SPA">
<s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="07" i2="X" l="FRE">
<s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="07" i2="X" l="ENG">
<s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="07" i2="X" l="SPA">
<s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="08" i2="X" l="FRE">
<s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="08" i2="X" l="ENG">
<s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="08" i2="X" l="SPA">
<s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
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<s1>172</s1>
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<fN44 i1="01">
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<fN82>
<s1>OTO</s1>
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