1. Separationof antivirals usingorganicsolvents
blendingtechnique
Ledipasvir in mixturewith Copovidone 1- Sofosbuvir
2-Ledipasvir copovidone
3- Naphthalene(internalstandard)
Gradientelution:
1-Paracetamol
2-PhenylephrineHCl
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
Isocraticelutionmethodfor
separationof OxybutininHCl and
preservativesissyrup:
1- Methyl paraben sodium
2- propyl paraben sodium
3- Oxybutinin HCl
1- PseudoephedrineHCl
2- Chlorpheniraminemaleate
on C8 packing
Separationof butylated hydroxyl-
touene fromointmentbasafter
ectraction:
1- Butylated hydroxyl toluene

3. 1- Amprolium
Separationof B1, B6 byionpairing
1- PyridoxineHCl
2- ThiamineHCl
Separationof Critical pair1, 2
withresolutionRs =3 andK 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 B12ampoul and
propyl parabenas
preservative
1- Cyanocobalamine
2- Propyl paraben
1-Caffeine
2-Clorpheniraminemaleate
3-Dextromethorphane
GC method
1- n-butanol
2-propyleneglycol
GC method
C8 packing with 10um particle size

5. Separationdone byionpairingtechniqueandits effectonfolicacidmolecules:
1- Folicacid
2- Cyanocobalamine
1- Cyanocobalamine
2- Folicacid
Separationof 1,2 princple peaksonC8 packingwith10um particlesize andreversedelutionsequenceof the
same two peaksbythe same mobile phase onC18 packingwith5um 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 umparticle size

6. Thyme extractGuava extract
Fennel extract
Eucalyptus extract