1. Separation of antivirals using organic solvents
blending technique
Ledipasvir in mixture with Copovidone 1- Sofosbuvir
2- Ledipasvir copovidone
3- Naphthalene (internal standard)
Gradient elution:
1-Paracetamol
2-Phenylephrine HCl
3-Guaifensine
4-Methyl paraben sodium
5-Propyl paraben sodium
qualificative and quantitative
analytical method for analysis of
preservative in co-trimoxazole
suspension via gradient elution:
1-Sodium benzoate
2-Methyl paraben sodium
3-Propyl paraben sodium
2. Gradient method for rapid washing
out interference of doxycycline after
elution of principle peak:
1-EDTA disodium
Isocratic elution method for
separation of Oxybutinin HCl and
preservatives is syrup:
1- Methyl paraben sodium
2- propyl paraben sodium
3- Oxybutinin HCl
1- Pseudoephedrine HCl
2- Chlorpheniramine maleate
on C8 packing
Separation of butylated hydroxyl-
touene from ointment bas after
ectraction:
1- Butylated hydroxyl toluene
3. 1- Amprolium
Separation of B1, B6 by ion pairing
1- Pyridoxine HCl
2- Thiamine HCl
Separation of Critical pair 1, 2
with resolution Rs = 3 and K for
the last peak = 8 by isocratic
method
1- Lidocaine HCl
2- Methyl paraben
3- Triamcinolone acetonide
4- Propyl paraben
1-Methoxaline
2-Chlorochresol
4. Vitamine B12 ampoul and
propyl paraben as
preservative
1- Cyanocobalamine
2- Propyl paraben
1-Caffeine
2-Clorpheniramine maleate
3-Dextromethorphane
GC method
1- n-butanol
2-propylene glycol
GC method
Separation done by ion pairing
technique and its effect on folic
acid molecules:
1- Folic acid
2- Cyanocobalamine
C8 packing with 10um particle size
5. 1- Cyanocobalamine
2- Folic acid
Separation of 1,2 princple peaks on C8 packing with 10um particle size and reversed elution sequence of the
same two peaks by the same mobile phase on C18 packing with 5um particle size
1- Amprolium
2- Ethopabate
Qualification and quantification method for analysis of preservatives in Phyto extracts
1- Potassium sorbate 2- sodium benzoate 3- Methyl paraben sodium
C18 packing with 5 um particle size
Thyme extract
