Journal
PHARMACEUTICAL DEVELOPMENT AND TECHNOLOGY
Volume 24, Issue 1, Pages 12-23Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10837450.2017.1410556
Keywords
Pectin; propolis waste material; l-alanyl-l-glutamine; microparticles; spray drying; neutrophils
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Funding
- CAPES (Coordination of Improvement of Higher Education Personnel) [BEX 9519/13-0]
- CNPq (National Counsel of Technological and Scientific Development) [470965/2013-4]
- FINEP (Financier of Studies)
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Catabolic conditions like acquired immunodeficiency syndrome, cancer, and burn can cause immunosuppression. Amino acids such as alanine and glutamine are essential for the activity of the immune system. Propolis is immunostimulant and the waste of propolis extraction has been reused with technological and therapeutic purposes. Therefore, this study describes the association of propolis byproduct extract (BPE) with pectin to prepare spray-dried microparticles containing the dipeptide l-alanyl-l-glutamine as stimulant systems of neutrophils. The use of a factorial design allowed selecting the best formulation, which was characterized by morphology, size, and entrapment efficiency analyses. In addition, the systems were characterized by thermal and X-ray diffraction analysis, Fourier-transform infrared spectroscopy, in vitro drug release, and in vitro cytotoxicity and stimulation test of neutrophils. Small well-structured microparticles with good entrapment efficiency values were achieved. Thermal stability of formulation was observed, and it was proved that pectin, BPE and l-alanyl-l-glutamine were dispersed throughout the matrix. The drug was released from the microparticles during 24 h governed by swelling and diffusion. The drug-loaded formulations showed a significant stimulating effect on neutrophils. These structures could increase the activity of immune cells, and other in vitro and in vivo studies should be performed in the future.
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