ENCAPSULATION OF L-ASCORBIC ACID WITHIN THE NATURAL BIOPOLYMER—GALACTOMANNAN—USING THE SPRAY-DRYING METHOD: PREPARATION, CHARACTERIZATION, AND EVALUATION OF ANTIOXIDANT ACTIVITY

Química Nova

Souza, Carlos A. G. de¹  Cunha, Arcelina P.¹  Siqueira, Sônia M. C.¹  Amorim, Antônia F. V. de¹  Gonçalves, Tamara¹  Ricardo, Nágila M. P. S.¹  Morais, Selene M. de¹  Universidade Estadual do Ceará, Fortaleza, BR¹  Universidade Federal do Ceará, Fortaleza, BR¹  Gomes, Rayane N.¹ 

关键词:  ascorbic acid;    microparticles;    Delonix regia;    galactomannan;   

DOI  :  10.5935/0100-4042.20150104

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In this study, the spray drying technique was used to prepare L-ascorbic acid (AA) microparticles encapsulated with galactomannan-an extract from the seeds of the Delonix regia species. The physico-chemical characteristics, antioxidant activity, and encapsulation efficiency of the AA microparticles were evaluated and characterized using thermogravimetric analysis, differential scanning calorimetry, infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. The free-radical scavenging activity of the AA microparticles was determined at different environmental conditions using DPPH (1,1-diphenyl-2-picryl-hydrazyl). X-ray diffraction measurements demonstrated a loss of crystallinity in AA after the encapsulation process, and a DSC scan also showed the loss of the compound's melting peak. Thermogravimetric analysis showed small differences in the thermal stability of galactomannan before and after the incorporation of AA. The mean diameters of the obtained spherical microspheres were in the range of 1.39 ± 0.77 µm. The encapsulation efficiency of AA microparticles in different environmental conditions varied from 95.40 to 97.92, and the antioxidant activity showed values ranging from 0.487 to 0.550 mg mL-1.

【 授权许可】

Unknown