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- 주제어 : Polyvinyl alcohol particles (검색결과 2 건)
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Bo Liu,Chao Li,Yicheng Wang,Jun Nie,Xiaoqun Zhu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
The vortex-ring derived particles are new type of non-spherical hydrogel particles, which are prepared byimitating the process of vortex-ring in nature. However, the traditional existing vorticity ring derivedhydrogel particles were prepared by dropping polyelectrolyte solution into contra-ion coagulation bath,which limited the choice of materials. In this paper, a strategy of preparation non-spherical hydrogel particlesby using non-polyelectrolyte polyvinyl alcohol through the method of vortex ring was proposed. Based on the principle that the boraciated polyvinyl alcohol solution could be quickly gelled underalkaline condition, the spherical and various derivative shapes (red cell, bowl, dish, ring) of polyvinylalcohol vortex-ring derived hydrogel particles (PVHP) were prepared. The hydrogel particles have theability to assemble into different modules by dynamic borate bond in the hydrogel particles. Also, thisdynamic borate bond endowed the PVHP decomposable and recyclable performances. In addition,two-compartments, three-compartments and magnetic PVHP were also prepared, endowing PVHP withseveral functions. which opens up a new environmentally friendly way for the preparation of multifunctionalparticles.
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이종익,곽병국,심형진,이종범,이용철,유재형,한상문 중앙대학교 의과대학 의과학연구소 2003 中央醫大誌 Vol.28 No.1
The aim of the study was to evaluate the possibility of therapeutic use of chitosan microspheres as a new embolic material. Twenty four New Zealand white rabbits were divided into four groups. Polyvinyl alhocol (PVA) particles (150-250 ㎛ ) was used in group 1. Chitosan microspheres were used in group 2 (150-250 ㎛ ), group 3 (250-355 ㎛) and group 4 (355-500 ㎛) respectively. Arteriography of right kidney was performed using 4 F cobra catheter. Embolization was continued until complete occlusion of the right renal artery was achieved. Catheters were tested whether the lumen is obstructed by embolic materials during and after embolization. One animal was sacrificed in each group on the 1st and 3rd day, 1st, 2nd, 4th, and 8th week respectively. Basic hematologic and blood chemisty were analyzed, and gross and microscopic pathologic findings were observed. Chitosan microspheres were round to oval shape, and had smooth surface and even size under the light microscope. Successful embolizations were achieved in all twenty four rabbits. On gross pathologic examination, all chitosan microsphere groups showed no differences from PVA particle group in renal contraction and discoloration. Histologically chitosan microsphere groups had a higher incidence of vasculitis. but did not show any recanalization in comparison with PVA particle group. Hematologic and blood chemisty showed no significant abnormal change in all groups. In conclusion, effective, technically easy and safe embolizations were achieved with chitosan microspheres in rabbit kidney. Chitosan microspheres might be a good embolic material.
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