char = P;code = 80 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = y;code = 121 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = i;code = 105 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = y;code = 121 char = s;code = 115 char = t;code = 116 char = e;code = 101 char = m;code = 109 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = ;code = 32 char = l;code = 108 char = i;code = 105 char = k;code = 107 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = s;code = 115 char = e;code = 101 char = u;code = 117 char = d;code = 100 char = o;code = 111 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = a;code = 97 char = m;code = 109 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = t;code = 116 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = p;code = 112 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = .;code = 46 result sql = Polyethyleneimine phosphate and citrate systems act like pseudo polyampholytes as a starting method to isolate pepsin.
Polyethyleneimine phosphate and citrate systems act like pseudo polyampholytes as a starting method to isolate pepsin.char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = q;code = 113 char = u;code = 117 char = e;code = 101 char = o;code = 111 char = u;code = 117 char = s;code = 115 char = ;code = 32 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 = b;code = 98 char = e;code = 101 char = h;code = 104 char = a;code = 97 char = v;code = 118 char = i;code = 105 char = o;code = 111 char = u;code = 117 char = r;code = 114 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = y;code = 121 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = ;code = 32 char = (;code = 40 char = a;code = 97 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = s;code = 115 char = y;code = 121 char = n;code = 110 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = );code = 41 char = ;code = 32 char = i;code = 105 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 = 112 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ;code = 32 char = (;code = 40 char = s;code = 115 char = u;code = 117 char = c;code = 99 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = i;code = 105 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = );code = 41 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = u;code = 117 char = d;code = 100 char = i;code = 105 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = a;code = 97 char = n;code = 110 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = b;code = 98 char = i;code = 105 char = d;code = 100 char = i;code = 105 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = r;code = 114 char = y;code = 121 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = v;code = 118 char = a;code = 97 char = r;code = 114 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 = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = b;code = 98 char = s;code = 115 char = o;code = 111 char = r;code = 114 char = b;code = 98 char = a;code = 97 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = 4;code = 52 char = 2;code = 50 char = 0;code = 48 char = ;code = 32 char = n;code = 110 char = m;code = 109 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = l;code = 108 char = u;code = 117 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = x;code = 120 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = p;code = 112 char = H;code = 72 char = ,;code = 44 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 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 = n;code = 110 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = r;code = 114 char = e;code = 101 char = n;code = 110 char = g;code = 103 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = w;code = 119 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = x;code = 120 char = a;code = 97 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = d;code = 100 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = x;code = 120 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = y;code = 121 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = i;code = 105 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = y;code = 121 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = h;code = 104 char = a;code = 97 char = v;code = 118 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = p;code = 112 char = s;code = 115 char = e;code = 101 char = u;code = 117 char = d;code = 100 char = o;code = 111 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = a;code = 97 char = m;code = 109 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = o;code = 111 char = e;code = 101 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = r;code = 114 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = 5;code = 53 char = .;code = 46 char = 5;code = 53 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 6;code = 54 char = .;code = 46 char = 2;code = 50 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = i;code = 105 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = p;code = 112 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = v;code = 118 char = e;code = 101 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = c;code = 99 char = i;code = 105 char = p;code = 112 char = i;code = 105 char = t;code = 116 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = p;code = 112 char = H;code = 72 char = ;code = 32 char = r;code = 114 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 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 char = ;code = 32 char = 3;code = 51 char = .;code = 46 char = 5;code = 53 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 8;code = 56 char = .;code = 46 char = 0;code = 48 char = .;code = 46 char = ;code = 32 char = P;code = 80 char = e;code = 101 char = p;code = 112 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = t;code = 116 char = e;code = 101 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = c;code = 99 char = i;code = 105 char = p;code = 112 char = i;code = 105 char = t;code = 116 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = x;code = 120 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 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = p;code = 112 char = H;code = 72 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = .;code = 46 char = ;code = 32 char = C;code = 67 char = i;code = 105 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = h;code = 104 char = o;code = 111 char = w;code = 119 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = t;code = 116 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = c;code = 99 char = i;code = 105 char = p;code = 112 char = i;code = 105 char = t;code = 116 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = e;code = 101 char = f;code = 102 char = f;code = 102 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = d;code = 100 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 = c;code = 99 char = i;code = 105 char = p;code = 112 char = i;code = 105 char = t;code = 116 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = r;code = 114 char = s;code = 115 char = i;code = 105 char = b;code = 98 char = l;code = 108 char = y;code = 121 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 = v;code = 118 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = N;code = 78 char = a;code = 97 char = C;code = 67 char = l;code = 108 char = ;code = 32 char = (;code = 40 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = ;code = 32 char = h;code = 104 char = i;code = 105 char = g;code = 103 char = h;code = 104 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = 0;code = 48 char = .;code = 46 char = 2;code = 50 char = ;code = 32 char = M;code = 77 char = );code = 41 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = p;code = 112 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = k;code = 107 char = e;code = 101 char = p;code = 112 char = t;code = 116 char = ;code = 32 char = i;code = 105 char = t;code = 116 char = s;code = 115 char = ;code = 32 char = b;code = 98 char = i;code = 105 char = o;code = 111 char = l;code = 108 char = o;code = 111 char = g;code = 103 char = i;code = 105 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = v;code = 118 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = .;code = 46 char = ;code = 32 char = S;code = 83 char = t;code = 116 char = u;code = 117 char = d;code = 100 char = i;code = 105 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = p;code = 112 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = r;code = 114 char = m;code = 109 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = a;code = 97 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = ;code = 32 char = (;code = 40 char = b;code = 98 char = y;code = 121 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 = i;code = 105 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = s;code = 115 char = c;code = 99 char = a;code = 97 char = n;code = 110 char = n;code = 110 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = o;code = 111 char = r;code = 114 char = i;code = 105 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = r;code = 114 char = y;code = 121 char = );code = 41 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = a;code = 97 char = l;code = 108 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 = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = y;code = 121 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = n;code = 110 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 = c;code = 99 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = n;code = 110 char = z;code = 122 char = y;code = 121 char = m;code = 109 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = e;code = 101 char = m;code = 109 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = i;code = 105 char = r;code = 114 char = c;code = 99 char = u;code = 117 char = l;code = 108 char = a;code = 97 char = r;code = 114 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = i;code = 105 char = s;code = 115 char = m;code = 109 char = ;code = 32 char = s;code = 115 char = p;code = 112 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = r;code = 114 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = p;code = 112 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = s;code = 115 char = h;code = 104 char = o;code = 111 char = w;code = 119 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = n;code = 110 char = o;code = 111 char = n;code = 110 char = -;code = 45 char = s;code = 115 char = i;code = 105 char = g;code = 103 char = n;code = 110 char = i;code = 105 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 = ;code = 32 char = l;code = 108 char = o;code = 111 char = s;code = 115 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = s;code = 115 char = e;code = 101 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = a;code = 97 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = a;code = 97 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = e;code = 101 char = n;code = 110 char = z;code = 122 char = y;code = 121 char = m;code = 109 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = r;code = 114 char = u;code = 117 char = c;code = 99 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = y;code = 121 char = l;code = 108 char = e;code = 101 char = n;code = 110 char = e;code = 101 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = e;code = 101 char = .;code = 46 char = ;code = 32 char = H;code = 72 char = o;code = 111 char = w;code = 119 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = r;code = 114 char = ,;code = 44 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = l;code = 108 char = y;code = 121 char = m;code = 109 char = e;code = 101 char = r;code = 114 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 = c;code = 99 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = b;code = 98 char = i;code = 105 char = o;code = 111 char = l;code = 108 char = o;code = 111 char = g;code = 103 char = i;code = 105 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = v;code = 118 char = i;code = 105 char = t;code = 116 char = y;code = 121 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = p;code = 112 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = .;code = 46 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 result sql = The aqueous solution behaviour of polyethyleneimine (a cationic synthetic polymer) in the presence of anions (such as citrate and phosphate) was studied by means of turbidimetry. The variation of the absorbance at 420 nm of dilute mixture with pH, the polymer concentration and the ionic strength were examined. The mixture of polyethyleneinine citrate or polyethyleneinine phosphate behaves as a pseudo polyampholyte with an isoelectric point of 5.5 and 6.2 for phosphate and citrate respectively and a precipitation pH range between 3.5 and 8.0. Pepsin was completely precipitated with the polymer anion complex within this pH interval. Citrate showed a better precipitation effect than phosphate did. The precipitate was reversibly dissolved in NaCl (for concentrations higher than 0.2 M) and pepsin kept its biological activity. Studies of pepsin thermal stability (by differential scanning calorimetry) revealed that the polyethyleneimine presence increased the enzyme denaturation temperature. The circular dichroism spectrum of pepsin showed a non-significant loss of secondary and tertiary enzyme structure by the polyethyleneimine. However, the polymer presence increased the biological activity of pepsin.
Publication: J. Chromatogr. B Analyt. Technol. Biomed. Life Sci. 2007 Dec 1 ;860(1)::63-8.
Publication Date: 2007 Dec 1
Study Author(s): Manzur, Alejandra;Spelzini, Darío;Farruggia, Beatriz;Romanini, Diana;Picó, Guillermo;
Institution: Bioseparation Lab., Physical Chemistry Department, Faculty of Biochemical and Pharmaceutical Sciences, National University of Rosario, FonCyT, CIUNR and CONICET, Suipacha 570 (S2002RLK), Rosario, Argentina.
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The aqueous solution behaviour of polyethyleneimine (a cationic synthetic polymer) in the presence of anions (such as citrate and phosphate) was studied by means of turbidimetry. The variation of the absorbance at 420 nm of dilute mixture with pH, the polymer concentration and the ionic strength were examined. The mixture of polyethyleneinine citrate or polyethyleneinine phosphate behaves as a pseudo polyampholyte with an isoelectric point of 5.5 and 6.2 for phosphate and citrate respectively and a precipitation pH range between 3.5 and 8.0. Pepsin was completely precipitated with the polymer anion complex within this pH interval. Citrate showed a better precipitation effect than phosphate did. The precipitate was reversibly dissolved in NaCl (for concentrations higher than 0.2 M) and pepsin kept its biological activity. Studies of pepsin thermal stability (by differential scanning calorimetry) revealed that the polyethyleneimine presence increased the enzyme denaturation temperature. The circular dichroism spectrum of pepsin showed a non-significant loss of secondary and tertiary enzyme structure by the polyethyleneimine. However, the polymer presence increased the biological activity of pepsin.
PMID: 17981101