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result sql = Fabrication of covered porous PLGA microspheres using hydrogen peroxide for controlled drug delivery and regenerative medicine.
Fabrication of covered porous PLGA microspheres using hydrogen peroxide for controlled drug delivery and regenerative medicine.
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char = o;code = 111
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char = ;code = 32
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char = a;code = 97
char = y;code = 121
char = s;code = 115
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char = i;code = 105
char = n;code = 110
char = ;code = 32
char = v;code = 118
char = i;code = 105
char = t;code = 116
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char = ,;code = 44
char = ;code = 32
char = t;code = 116
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char = e;code = 101
char = i;code = 105
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char = t;code = 116
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char = w;code = 119
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char = r;code = 114
char = e;code = 101
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
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char = b;code = 98
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
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char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
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char = d;code = 100
char = i;code = 105
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = b;code = 98
char = a;code = 97
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = w;code = 119
char = o;code = 111
char = r;code = 114
char = k;code = 107
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = P;code = 80
char = L;code = 76
char = G;code = 71
char = A;code = 65
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = p;code = 112
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = c;code = 99
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = f;code = 102
char = u;code = 117
char = l;code = 108
char = l;code = 108
char = y;code = 121
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char = f;code = 102
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char = b;code = 98
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = d;code = 100
char = r;code = 114
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = k;code = 107
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = y;code = 121
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = P;code = 80
char = L;code = 76
char = G;code = 71
char = A;code = 65
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = p;code = 112
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = y;code = 121
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = o;code = 111
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = f;code = 102
char = i;code = 105
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = D;code = 68
char = e;code = 101
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char = <;code = 60
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char = /;code = 47
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result sql = Poly(lactic-co-glycolic acid) (PLGA) microsphere has been a useful tool in delivering therapeutic drugs and biologically active proteins. In this study, a covered porous PLGA microsphere was manufactured using W(1)/O/W(2) double emulsion solvent evaporation method, utilizing hydrogen peroxide as a novel porogen. An enzymatic reaction between hydrogen peroxide and catalase produced oxygen bubbles and thus many internal pores within microsphere were naturally developed. When different molar ratios between lactide and glycolide in PLGA were examined, the ratio, 50:50 showed the most organized porous microstructure. Higher molecular weight of PLGA seemed to be favorable in creating a porous structure. By testing various concentrations of hydrogen peroxide, it was found that rather concentrated one was more efficient in developing a porous network in the microspheres. The source of the skin layer that covers the whole surface of the microsphere was found to be PLGA, not polyvinyl alcohol (PVA). The residual amount of hydrogen peroxide was negligible after a thorough evaporation of PLGA microsphere. When release profiles of dexamethasone (Dex) with morphologically different microspheres such as, nonporous, covered porous, and porous, were investigated for up to 28 days in vitro, their release patterns were found to be significantly different on a temporal basis. The present work demonstrated that the covered porous PLGA microspheres could be successfully fabricated using hydrogen peroxide and that the covered skin layer on the PLGA microsphere played an important role in determining the characteristic release profiles of Dex.

Publication: J Control Release 2009 Jan 5 ;133(1)::37-43. :doi: 10.1016/j.jconrel.2008.09.006.
Publication Date: 2009 Jan 5
Study Author(s): Bae, Soon Eon;Son, Jun Sik;Park, Kwideok;Han, Dong Keun;
Institution: Biomaterials Research Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Republic of Korea.
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Poly(lactic-co-glycolic acid) (PLGA) microsphere has been a useful tool in delivering therapeutic drugs and biologically active proteins. In this study, a covered porous PLGA microsphere was manufactured using W(1)/O/W(2) double emulsion solvent evaporation method, utilizing hydrogen peroxide as a novel porogen. An enzymatic reaction between hydrogen peroxide and catalase produced oxygen bubbles and thus many internal pores within microsphere were naturally developed. When different molar ratios between lactide and glycolide in PLGA were examined, the ratio, 50:50 showed the most organized porous microstructure. Higher molecular weight of PLGA seemed to be favorable in creating a porous structure. By testing various concentrations of hydrogen peroxide, it was found that rather concentrated one was more efficient in developing a porous network in the microspheres. The source of the skin layer that covers the whole surface of the microsphere was found to be PLGA, not polyvinyl alcohol (PVA). The residual amount of hydrogen peroxide was negligible after a thorough evaporation of PLGA microsphere. When release profiles of dexamethasone (Dex) with morphologically different microspheres such as, nonporous, covered porous, and porous, were investigated for up to 28 days in vitro, their release patterns were found to be significantly different on a temporal basis. The present work demonstrated that the covered porous PLGA microspheres could be successfully fabricated using hydrogen peroxide and that the covered skin layer on the PLGA microsphere played an important role in determining the characteristic release profiles of Dex.
PMID: 18838089

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