Preparation of pellets containing Pothomorphe umbellata extracts by extrusion-spheronization: improvement of 4-nerolidylcatechol photostability

Revista Brasileira de Farmacognosia

César A. De Araújo-júnior²  Fernanda S. De Oliveira Costa²  Stephânia F. Taveira²  Ricardo N. Marreto²  Marize C. Valadares¹  Eliana M. Lima² 

[1] ,Universidade Federal de Goiás Faculdade de Farmácia Laboratório de Tecnologia Farmacêutica,Brazil

关键词: extrusion-spheronization;    film coating;    herbal extracts;    multiparticulate solid dosage forms;    nerolidylcatechol;    photostability;   

DOI  :  10.1590/S0102-695X2012005000125

来源: SciELO

【 摘 要 】

Pothomorphe umbellata (L.) Miq., Piperaceae, has been extensively used in Brazilian folk medicine and it is well known for its strong antioxidant properties. However, its main active constituent, 4-nerolydilcatechol (4-NC), is sensitive to ultraviolet and visible light, which can limit the use of intermediate and final herbal preparations of this species. In the present work, coated multiparticulate solid dosage forms of P. umbellata were obtained with the purpose of increasing the stability of 4-NC. P. umbellata extract was used as a wetting liquid for the preparation of pellets by extrusion-spheronization. Pellets were coated in a fluidized bed by three different polymers (hydroxypropylmethylcellulose (HPMC), polyvynilpirrolidone K-30 (PVP-K30), and polyvinyl alcohol-polyethylene glycol graft-copolymer (PVAPEG)). 4-NC photostability was evaluated by an accelerated photostability protocol. Pellets showed a narrow size distribution and low friability. 4-NC photodegradation followed a second order degradation kinetics with similar k values for the percolate, uncoated pellets and HPMC coated pellets. Photoprotection was higher in pellets coated with PVP-K30 and PVA-PEG. PVA-PEG coated pellets with 6 and 9% weight gain resulted in a final concentration of 4-NC approximately cinco times higher than uncoated pellets or liquid extracts, suggesting the potential of this formulation as a multiparticulate solid dosage form for P. umbellata extracts.

【 授权许可】

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