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result sql = Investigation of the effect of various shellac coating compositions containing different water-soluble polymers on in vitro drug release.
Investigation of the effect of various shellac coating compositions containing different water-soluble polymers on in vitro drug release.
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char = s;code = 115
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char = i;code = 105
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char = ;code = 32
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char = s;code = 115
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char = f;code = 102
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char = d;code = 100
char = r;code = 114
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char = l;code = 108
char = i;code = 105
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char = p;code = 112
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char = m;code = 109
char = e;code = 101
char = r;code = 114
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char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
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char = e;code = 101
char = r;code = 114
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char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
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char = h;code = 104
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char = r;code = 114
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char = t;code = 116
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char = ;code = 32
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char = u;code = 117
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char = n;code = 110
char = ;code = 32
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char = u;code = 117
char = l;code = 108
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char = e;code = 101
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char = ;code = 32
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char = s;code = 115
char = t;code = 116
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char = u;code = 117
char = i;code = 105
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char = e;code = 101
char = ;code = 32
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char = o;code = 111
char = r;code = 114
char = ;code = 32
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char = ;code = 32
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char = o;code = 111
char = u;code = 117
char = r;code = 114
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char = .;code = 46
char = ;code = 32
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char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ,;code = 44
char = ;code = 32
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char = ;code = 32
char = r;code = 114
char = a;code = 97
char = p;code = 112
char = i;code = 105
char = d;code = 100
char = ;code = 32
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char = n;code = 110
char = d;code = 100
char = ;code = 32
char = c;code = 99
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char = m;code = 109
char = p;code = 112
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char = e;code = 101
char = t;code = 116
char = e;code = 101
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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 = o;code = 111
char = f;code = 102
char = ;code = 32
char = d;code = 100
char = r;code = 114
char = u;code = 117
char = g;code = 103
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = n;code = 110
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char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = s;code = 115
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char = r;code = 114
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = m;code = 109
char = u;code = 117
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = f;code = 102
char = l;code = 108
char = u;code = 117
char = i;code = 105
char = d;code = 100
char = .;code = 46
char = ;code = 32
char = D;code = 68
char = r;code = 114
char = u;code = 117
char = g;code = 103
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 = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = a;code = 97
char = c;code = 99
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
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 = a;code = 97
char = m;code = 109
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = w;code = 119
char = e;code = 101
char = e;code = 101
char = n;code = 110
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char = 3;code = 51
char = -;code = 45
char = 6;code = 54
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = t;code = 116
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char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = a;code = 97
char = c;code = 99
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
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 = a;code = 97
char = m;code = 109
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = P;code = 80
char = V;code = 86
char = A;code = 65
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = H;code = 72
char = P;code = 80
char = M;code = 77
char = C;code = 67
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = u;code = 117
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
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 = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = s;code = 115
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = v;code = 118
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = 1;code = 49
char = 2;code = 50
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = h;code = 104
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char = .;code = 46
char = <;code = 60
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char = /;code = 47
char = >;code = 62
result sql = In this study drug pellets were coated with aqueous shellac coating formulations containing different amounts of polyvinyl alcohol (PVA), hydroxypropyl methylcellulose (HPMC), and carbomer 940. The coating level needed for enteric coating was determined. The influence of different amounts of PVA, HPMC, and carbomer on drug release and mechanism; the porosity, and the stability of shellac coatings was investigated. The results show that the incorporation of different concentrations of HPMC into shellac coatings, due to the increasing of pores, could considerably increase the drug release from the pellets in purified water. Moreover, the swelling effect of carbomer 940 leads to much more diffusivity through shellac coatings in water. In addition, PVA results in small cracking in the films and much more diffusion of drug in water. Furthermore, all coating systems containing different hydrophilic polymers that were used in the present work could prevent the dissolution of drug in simulated gastric juice for 2 hours. On the other hand, a rapid and complete release of drug within 45 minutes was observed in simulated intestinal fluid. Drug release from shellac coated pellets and ones containing different amounts of carbomer was affected between 3-6 months, whereas shellac coatings containing different amounts of PVA or HPMC show the same dissolution profiles with small deviation after 12 months.

Publication: Drug Dev Ind Pharm 2005 Jan ;31(1)::99-108.
Publication Date: 2005 Jan
Study Author(s): Qussi, Basel;Suess, Wolfgang G;
Institution: Department of Pharmaceutical Technology, Institute of Pharmacy, University of Leipzig, Leipzig, Germany.
Shortcut link to this study:
In this study drug pellets were coated with aqueous shellac coating formulations containing different amounts of polyvinyl alcohol (PVA), hydroxypropyl methylcellulose (HPMC), and carbomer 940. The coating level needed for enteric coating was determined. The influence of different amounts of PVA, HPMC, and carbomer on drug release and mechanism; the porosity, and the stability of shellac coatings was investigated. The results show that the incorporation of different concentrations of HPMC into shellac coatings, due to the increasing of pores, could considerably increase the drug release from the pellets in purified water. Moreover, the swelling effect of carbomer 940 leads to much more diffusivity through shellac coatings in water. In addition, PVA results in small cracking in the films and much more diffusion of drug in water. Furthermore, all coating systems containing different hydrophilic polymers that were used in the present work could prevent the dissolution of drug in simulated gastric juice for 2 hours. On the other hand, a rapid and complete release of drug within 45 minutes was observed in simulated intestinal fluid. Drug release from shellac coated pellets and ones containing different amounts of carbomer was affected between 3-6 months, whereas shellac coatings containing different amounts of PVA or HPMC show the same dissolution profiles with small deviation after 12 months.
PMID: 15704861

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