海藻酸鈣納米膠囊的制備、表征及流變性研究
[Abstract]:Nanocapsule technology refers to embedding sensitive components in coatings or wall materials (usually polymers) to protect them from the physical and chemical effects of the surrounding media. It can encapsulate liquid flavor in capsules or membranes and isolate them from the outside environment. Nanocapsule technology effectively solves the problem of liquid flavor. Sodium alginate (SA) is a kind of natural polysaccharide extracted from natural algae. It has a wide range of sources and good biocompatibility. Its gel process is mild, so SA is widely used in the preparation of encapsulated drugs, proteins and cell wall materials. Calcium alginate nanocapsules (CANs) were prepared by ionic polymerization in an oil-in-water emulsion system. The concentration of SA, CaCl2, types of emulsifiers, dosage of emulsifiers, emulsifying methods and emulsifying time of calcium alginate nanocapsules (SIZE) and particle size dispersion coefficient (PDI) were systematically investigated. The preparation conditions were studied by adding amount, stirring speed of calcium chloride, oil droplet acceleration and reaction temperature. DLS, SEM, FTIR and TGA were used to characterize the size of the calcium alginate nanocapsules (CANs), the apparent morphology, chemical molecular structure and stability, and also to the sea. The thermal stability, stability and rheological properties of calcium alginate nanocapsule emulsion were characterized. Steady state and dynamic rheological behavior of alginate nanocapsule emulsion prepared by different concentration of sodium alginate, emulsifier concentration, emulsification method, flavoring dosage and reaction temperature were systematically tested. Size and PDI of calcium nanocapsules (CANs) are greatly affected by preparation conditions. The optimum preparation conditions of calcium alginate nanocapsules are as follows: SA concentration is 0.02%, CaCl2 concentration is 0.080%, emulsifier is AE09, emulsifier dosage is 1/10 of essence dosage, emulsification is obtained by single factor parallel experiment. The method was ultrasonic emulsification for 10 minutes, oil-water ratio was 1:1, flavor addition was 0.6%, stirring speed was 1000r/min, sodium alginate dropping acceleration was 0.5 d/s, reaction temperature was 45 C. Under the optimum preparation conditions, calcium alginate nanocapsules showed irregular spherical shape and were measured by light scattering instrument. The average particle size was 110.2 nm, and the particle size distribution coefficient (PDI) was 0.062. The wall material sodium alginate (SA), core material citrus flavor and calcium alginate nanocapsules (CANs) were embedded in the wall material by infrared spectroscopy. During the preparation of calcium alginate nanocapsules, the wall material sodium alginate reacted with calcium chloride to form egg lattice structure. The thermogravimetric analysis of citrus flavour, calcium alginate nanocapsules and blank nanocapsules showed that the thermal stability of citrus flavors was enhanced at high temperature after being encapsulated by sodium alginate and calcium chloride. The results showed that the thermal stability of calcium alginate nanocapsule emulsion was 98.6%, and the stability was 94.8%. The rheological properties of calcium alginate nanocapsule emulsion were characterized. The dynamic rheological experiment showed that the linear viscoelastic region of calcium alginate nanocapsule emulsion was 0.1%-10%. With the increase of the oscillation frequency, the nanocapsule emulsion changed from sticky to elastic. The steady temperature rheology experiment showed that the safe temperature range of 27-40 cm was the sample. The nanocapsule emulsion prepared as a non Newtonian nanofluid showed shear thinning in the range of 0.001-10s-1 shear rate. The viscosity remained basically unchanged in the range of 10-000s-1 shear rate. Calcium alginate nanoparticles were prepared from different concentrations of sodium alginate, emulsifier dosage, flavoring dosage and reaction temperature. The dynamic modulus test results showed that the loss modulus of calcium alginate nanocapsule emulsion at low frequency was higher than that of storage modulus, and the viscosity characteristics dominated. When the frequency increased, the storage modulus slowly exceeded the loss modulus, and nano latex showed elastic characteristics. The size of the capsules is different, so the transition frequency from viscosity to elasticity is different and the turning frequency decreases with the increase of particle size. Steady state rheological test results show that the prepared alginate nanocapsule emulsion is non Newtonian nanofluid, and nanocapsule emulsion shows shear thinning in the range of 0.001-10s-1 shear rate. When the shear rate increased by 10-1000s-1, the viscosity remained unchanged. Different preparation conditions resulted in different particle sizes of calcium alginate capsules. The larger the particle size, the lower the apparent viscosity, and the smaller the slope of apparent viscosity reduction.
【學(xué)位授予單位】:上海應(yīng)用技術(shù)學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TB383.1
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