char = C;code = 67
char = h;code = 104
char = i;code = 105
char = t;code = 116
char = o;code = 111
char = s;code = 115
char = a;code = 97
char = n;code = 110
char = -;code = 45
char = E;code = 69
char = D;code = 68
char = T;code = 84
char = A;code = 65
char = ;code = 32
char = c;code = 99
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char = j;code = 106
char = u;code = 117
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char = t;code = 116
char = e;code = 101
char = :;code = 58
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char = o;code = 111
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char = e;code = 101
char = l;code = 108
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char = p;code = 112
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char = ;code = 32
char = g;code = 103
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = .;code = 46
result sql = Chitosan-EDTA conjugate: a novel polymer for topical gels.
Chitosan-EDTA conjugate: a novel polymer for topical gels.
char = A;code = 65
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char = r;code = 114
char = e;code = 101
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char = n;code = 110
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char = E;code = 69
char = D;code = 68
char = T;code = 84
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char = o;code = 111
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char = e;code = 101
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char = x;code = 120
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char = a;code = 97
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char = h;code = 104
char = i;code = 105
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char = T;code = 84
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char = e;code = 101
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char = e;code = 101
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char = l;code = 108
char = ;code = 32
char = u;code = 117
char = s;code = 115
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char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = t;code = 116
char = e;code = 101
char = c;code = 99
char = h;code = 104
char = n;code = 110
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char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
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char = o;code = 111
char = p;code = 112
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char = r;code = 114
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char = e;code = 101
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char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = m;code = 109
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char = a;code = 97
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char = s;code = 115
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char = i;code = 105
char = t;code = 116
char = y;code = 121
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char = o;code = 111
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char = ;code = 32
char = N;code = 78
char = a;code = 97
char = C;code = 67
char = h;code = 104
char = i;code = 105
char = t;code = 116
char = o;code = 111
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char = E;code = 69
char = D;code = 68
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char = A;code = 65
char = ;code = 32
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char = a;code = 97
char = v;code = 118
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char = e;code = 101
char = e;code = 101
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char = e;code = 101
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char = w;code = 119
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char = h;code = 104
char = ;code = 32
char = t;code = 116
char = h;code = 104
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char = s;code = 115
char = e;code = 101
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char = f;code = 102
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char = c;code = 99
char = a;code = 97
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char = (;code = 40
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char = M;code = 77
char = C;code = 67
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char = ,;code = 44
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char = r;code = 114
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char = m;code = 109
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char = h;code = 104
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char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = u;code = 117
char = l;code = 108
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = H;code = 72
char = P;code = 80
char = M;code = 77
char = C;code = 67
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char = ,;code = 44
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char = u;code = 117
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char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = o;code = 111
char = p;code = 112
char = h;code = 104
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = (;code = 40
char = N;code = 78
char = a;code = 97
char = P;code = 80
char = C;code = 67
char = P;code = 80
char = );code = 41
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = s;code = 115
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char = d;code = 100
char = i;code = 105
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char = ;code = 32
char = c;code = 99
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char = r;code = 114
char = b;code = 98
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char = o;code = 111
char = l;code = 108
char = ;code = 32
char = 9;code = 57
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char = 0;code = 48
char = ;code = 32
char = (;code = 40
char = N;code = 78
char = a;code = 97
char = C;code = 67
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char = 8;code = 56
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char = l;code = 108
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char = e;code = 101
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char = n;code = 110
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char = a;code = 97
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char = e;code = 101
char = n;code = 110
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char = s;code = 115
char = .;code = 46
char = ;code = 32
char = N;code = 78
char = a;code = 97
char = C;code = 67
char = h;code = 104
char = i;code = 105
char = t;code = 116
char = o;code = 111
char = -;code = 45
char = E;code = 69
char = D;code = 68
char = T;code = 84
char = A;code = 65
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = s;code = 115
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char = s;code = 115
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char = a;code = 97
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char = e;code = 101
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char = l;code = 108
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char = s;code = 115
char = ,;code = 44
char = ;code = 32
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char = e;code = 101
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char = a;code = 97
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char = p;code = 112
char = a;code = 97
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char = ;code = 32
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char = ;code = 32
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char = .;code = 46
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char = e;code = 101
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char = g;code = 103
char = e;code = 101
char = l;code = 108
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char = h;code = 104
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char = v;code = 118
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char = e;code = 101
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char = o;code = 111
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char = e;code = 101
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char = w;code = 119
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = b;code = 98
char = l;code = 108
char = i;code = 105
char = s;code = 115
char = h;code = 104
char = e;code = 101
char = d;code = 100
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char = g;code = 103
char = e;code = 101
char = l;code = 108
char = a;code = 97
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char = n;code = 110
char = i;code = 105
char = z;code = 122
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = t;code = 116
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result sql = A recently developed chitosan-EDTA conjugate, neutralized with sodium hydroxide (NaChito-EDTA), has been tested for possible topical use. The technical properties and microbial stability of NaChito-EDTA have been compared with those of carmellose sodium (NaCMC), hydroxypropylmethylcellulose (HPMC), sodium polycarbophil (NaPCP) and sodium carbopol 980 (NaC980), well established gelatinizing agents. NaChito-EDTA forms stable, colourless, completely transparent hydrogels at a polymer concentration of 0.5%. Of the polymers tested the novel polymer had the lowest incompatibility with multivalent cations and with ethanol, and much the best swelling properties. After 28 days of incubation at room temperature the rates of growth of the complete bacterial spectrum occurring in demineralized water and of Escherichia coli, serving as model strain representative of gram-negative bacteria, were at least 2 log and 5.7 log, respectively, lower in NaChito-EDTA gels than in the other hydrogels. This antimicrobial activity of NaChito-EDTA can be explained by its highest binding affinity towards magnesium, which stabilizes the outer membrane of gram-negative bacteria. However, this antimicrobial effect is insufficient to guarantee microbial stability. Further results showed that the antimicrobially acting polypeptide nisin can be recommended as an alternative novel preservative for NaChito-EDTA gels, because its antimicrobial spectrum could also be increased towards gram-negative bacteria in combination with chelating excipients. NaChito-EDTA seems, therefore, to be a promising novel polymer for topically-used gels, with advantages over well established gelatinizing agents.

Publication: J. Pharm. Pharmacol. 1998 May ;50(5)::445-52.
Publication Date: 1998 May
Study Author(s): Valenta, C;Christen, B;Bernkop-Schnürch, A;
Institution: Institute of Pharmaceutical Technology, University of Vienna, Austria.
Shortcut link to this study:
A recently developed chitosan-EDTA conjugate, neutralized with sodium hydroxide (NaChito-EDTA), has been tested for possible topical use. The technical properties and microbial stability of NaChito-EDTA have been compared with those of carmellose sodium (NaCMC), hydroxypropylmethylcellulose (HPMC), sodium polycarbophil (NaPCP) and sodium carbopol 980 (NaC980), well established gelatinizing agents. NaChito-EDTA forms stable, colourless, completely transparent hydrogels at a polymer concentration of 0.5%. Of the polymers tested the novel polymer had the lowest incompatibility with multivalent cations and with ethanol, and much the best swelling properties. After 28 days of incubation at room temperature the rates of growth of the complete bacterial spectrum occurring in demineralized water and of Escherichia coli, serving as model strain representative of gram-negative bacteria, were at least 2 log and 5.7 log, respectively, lower in NaChito-EDTA gels than in the other hydrogels. This antimicrobial activity of NaChito-EDTA can be explained by its highest binding affinity towards magnesium, which stabilizes the outer membrane of gram-negative bacteria. However, this antimicrobial effect is insufficient to guarantee microbial stability. Further results showed that the antimicrobially acting polypeptide nisin can be recommended as an alternative novel preservative for NaChito-EDTA gels, because its antimicrobial spectrum could also be increased towards gram-negative bacteria in combination with chelating excipients. NaChito-EDTA seems, therefore, to be a promising novel polymer for topically-used gels, with advantages over well established gelatinizing agents.
PMID: 9643436

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