1. Chemistry Department, Faculty of Science, Menofia University, Shebin El-Kom, Egypt
2. Faculty of Specific Education, Ain Shams University, Abassia, Cairo, Egypt
3. Hormone Department, National Research Centre, Dokki, Cairo, Egypt
4. Tanning Materials and Leather Technology Department, National Research Centre, Dokki, Cairo, Egypt
5. Chemistry Department, Faculty of Science, Qassim University, Buraydah, Saudi Arabia