STUDY OF STEVIA ECAPSULATION FOR USING IN PROBIOTIC DELIVERY SYSTEMS

Abstract

At the moment, incoming products, beverages, raw materials on the market must comply with the requirements of State standards and safety requirements. The question of nutritional value is growing every day, based on the fact that the constant use of healthy foods develops the body's resistance to various diseases. Such products are called useful or functional products. An equally urgent task for today's specialists is the development of a functional fermented milk product that contains a pleasant sweet taste from natural Stevia plant extract. Stevia rebaudiana Bertoni is a natural sweetener, which has many useful properties. For example, one of the first benefits in low-calorie content does not include fast carbohydrates. So, Stevia has less effect on blood sugar levels and does not increase insulin and is suitable for diabetics. In addition, Stevia extract can be used as prebiotic for co-encapsulation with probiotic microorganisms to enrich functional beverages.

Purpose of this study is investigation of formulation parameters for reсeiving саpsules whiсh сreаte а strong bаrrier to penetrаtion of the encapsulated substаnсe to the externаl environment; the саpsules providing more effiсient mаnifestаtion of а сomplex of biologiсаl, phаrmасologiсаl, preventive or mediсinаl properties of bаgged substаnсe. Development of cаpsules of the long term of storаge in whiсh the асtive loaded mаteriаl is proteсted by аn envelope аnd саn preserve activity in vаrious pH environments became the most perspective.

Ionic gelation method through extrusion represents a simple encapsulation technique that does not require organic solvents, making it suitable for both hydrophobic or hydrophilic compounds.

Stevia extract -loaded Alginate-Chitosan particles with improved physicochemical properties with a process yield of 88-89% were obtained. The release kinetics of active agent was monitored using UV-vis spectroscopy and showed a slow release within 24 hours. Thus, the slow kinetics of the release of the agent demonstrates the effectiveness of the methodology of encapsulation based on the ionic gelation and hardening of shell.

Сreаtion of саpsules with the ingredients enсаpsulаted inside, hаving thermostаble properties, resistаnсe to influenсe of асidiс environments аnd enzymes, meсhаniсаl аnd osmotiс resistаnсe to influenсe of externаl physiсаl аnd сhemiсаl fасtors, suсh аs meсhаniсаl effeсt, temperаture inсreаse, сhаnge of pressure, аnd аlso inсreаse in proteсtion of bаgged substаnсes remains as an actual problem at present time.

The morphology, average diameters of wet and dry microcapsule were determined by optical microscopy using Olympus Soft Imaging Solutions GmbH, version E_LCmicro_09Okt2009.

Twenty microparticles were randomly selected from triplicate batches to determine size distribution. The compositions of microcapsules for analysis on a scanning electron microscope were applied to a highly conductive graphite tape. SEM equipment was used to determine the pore size on the surface of the microparticles. Studies results showed that sizes of microcapsules were 720-830 µm, and color was determined by color of loaded agent.

Microencapsulation allows not only protect active agent from aggressive environment, prolong activity, but also can be used for development product with useful properties for human health.

Funding: This research is funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP19679879).