e rt K . G h az aryan b , M arina A . S h e yranyan c , G rig o r V . G yu lk h andanyan a a I ns titu te o f B io c h e m is try, N at. A c . S c i. o f A rm e nia, 5 /1 , P . S e v ak s tr., Y e re v an, 001 4, A rm e nia; b Y e re v an S tate M e dic al U niv e rs ity, 2 , K o ryu n s tr., Y e re v an, 002 5 , A rm e nia; c Y e re v an S tate U niv e rs ity, 1 A le x M ano o g ian, Y e re v an, 002 5 , A rm e nia ABSTRACT T h e b ind ing o f na no p artic le s z e o lite w ith a nu m b e r o f c atio nic p o rp h yrins s tu d ie d . P re v io usly, it w as e stab lish e d th at th e m ain m e c h anis m o f b inding th e z e o lite nano p artic le s w ith c atio nic p o rp h yrins is an io nic b o nd . S inc e b ind ing o f p o rp h yrins as lig a nd s to nano p artic le s at th e initial s tag e o f inte rac tio n is d e te rm ine d b y th e B ro w nian m o tio n o f p o rp h yrins , it is o b v io u s th a t th e inte rac tio n o f p o rp h yrins w ith nano p artic le s m a y d e p e nd o n th e te m p e rature . I n th e p re se nt p ap e r b y m e th o ds o f ab so rp tio n and fluo re sc e nc e sp e c tro sc o p y w a s s tu d ie d th e c o m p le x a tio n o f p o rp h yrins w ith z e o lite na no p artic le s at d iffe re nt te m p e rature c o nditio ns. I t w as e stab lish e d, th at th e re is a c le ar te m p e rature de p e nde nc e o f th e c o m p le x atio n o f c atio nic m e tallo p o rp h yrins w ith z e o lite nano p artic le s , a nd fo r c o rre c t de te rm inatio n o f th e p e rc e ntag e o f b ind ing m u s t b e s tric t th e rm o s ta ting o f th e e x p e rim e ntal c o nd itio ns . Keywords: z e o lite nano p artic le s , c atio nic p o rp h yrins , b inding , te m p e rature de p e nde nc e , th e rm o s tating c o nd itio ns