Microencapsulation by spray-drying of anthocyanin pigments from Corozo ( Bactris guineensis) fruit.
The anthocyanins of Bactris guineensis fruit were isolated with the aid of high-speed countercurrent chromatography (HSCCC) and preparative HPLC, and their chemical structures were elucidated by using spectroscopic methods. Among the identified pigments, cyanidin-3-rutinoside and cyanidin-3-glucoside were characterized as major constituents (87.9%). Peonidin-3-rutinoside, peonidin-3-glucoside, cyanidin-3-(6-O-malonyl)glucoside, and cyanidin-3-sambubioside were present in minor amounts. Four anthocyanin ethanolic extracts (AEEs) were obtained by osmotic dehydration and Soxhlet extraction and physicochemically characterized. The composition of anthocyanins was monitored by HPLC-PDA. The extracts with the highest anthocyanin content were subjected to the spray-drying process with maltodextrin. The so-obtained spray-dried powders were analyzed by scanning electron microscopy (SEM) and found to consist of spherical particles <50 microm in size. The anthocyanin composition was similar to that of the fruit. The microencapsulated powders were analyzed by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), revealing that they are quite stable until 100 degrees C. Storage stability tests of microcapsules showed that the release of anthocyanin pigments follows pseudo-first-order kinetics and that the process rate is increased by temperature and humidity. The most suitable conditions for storage were below 37 degrees C and <76% relative humidity, respectively.
Osorio
Coralia
C
Departamento de Química, Universidad Nacional de Colombia, AA 14490 Bogotá, Colombia.
Acevedo
Baudilio
B
Hillebrand
Silke
S
Carriazo
José
J
Winterhalter
Peter
P
Morales
Alicia Lucía
AL
D000872:Anthocyanins / Q000737:chemistry* / Q000302:isolation & purification; D028023:Arecaceae / Q000737:chemistry*; D003890:Desiccation; D004339:Drug Compounding; D005638:Fruit / Q000737:chemistry; D010316:Particle Size; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification
D000872:Anthocyanins; D010936:Plant Extracts