Title Nano structured star like sorbent for microextraction in packed syringe Type of Research Presentation Keywords star like sorbent, packed syringe, microextraction Abstract Star like poly ionic dendrimer with nano silica core were synthesized and characterized by FT-IR and NMR. And its efficiency were evaluated for preconcentration of bis phenol A in environmental and packed mineral water samples by HPLC. Researchers Nasim Mohammadnezhad (First Researcher)، Amir Abbas Matin (Second Researcher)، naser samadi (Third Researcher)، Hassan Valizadeh (Fourth Researcher)