Aijiren polypropylene screw micro vials atha kugwiritsidwa ntchito m'masamplers ambiri odziwika bwino a gasi ndi liquid chromatography. Mabotolo opepuka awa, otsika mtengo amapangidwa kuchokera ku polypropylene yolimba yomwe ili ndi kukana kwamankhwala abwino.