The Development Of The High Performance, Rapid Oil-soluble And Stable Liquid Rosemary Antioxidant And Its Complex Antioxidant

In order to develop a high performance, rapid oil-soluble and stable liquid rosemary antioxidant and its complex antioxidant, solving effectively many shortcomings of the current rosemary antioxidants, this thesis, basing that the modifier could strengthen supercritical extraction process, propose a new extraction method of the rosemary antioxidant by using supercritical CO2fluid combined with a co-solvent carrier. The effects of a series of different co-solvent carriers and supercritical CO2extraction conditions on the supercritical extraction efficiency were researched and the main results were as follows:1. Among a series of different co-solvent carriers studied, the solubilization effect of the complex co-solvent carrier, the E6K-25%ET was the most outstanding. The results showed that as a formulated co-solvent carrier, E6K-25%ET, could not only improve greatly the physical-chemical properties of the antioxidant extract of rosemary, but also promote sharply the solubility of carnosic acid during the extraction, which resulted in that the extraction yield of carnosic acid increased up to more than78%from25.83%in the pure supercritical CO? extraction. In addition, it was also found that a certain amount of C8added in the co-solvent carrier could not only reduce the ratio of ET in the complex co-solvent carrier but also did not have any effect on the yield of carnosic acid, which subsequently could reduce the volume of ET and production cost to some extent.2. The influence of the crushing degree of raw material, the extraction temperature, the static or dynamic extraction time, and the addition method of the co-solvent carrier were on the extraction examined respectively using single-factor test methods. The results showed as follows:(1) when the raw materials were crushed into powder by using claw crusher with a sieve (sieve pore size1.2mm), the extraction yield of carnosic acid was supreme;(2) Fixing the extraction pressure to30MPa, the extraction yield of carnosic acid was the highest when the extraction temperature was at60℃;(3) Considering the extraction yield of carnosic acid and the production cost, the optimum extraction time should be static extraction for45min, and then dynamic extraction for45min;(4) When the co-solvent carrier was directly added during extraction the yield of carnosic acid was better compared with that from other methods, and the difference between different addition methods of co-solven significantly reduced in the yield of carnosic acid with the increasing volume of the co-solvent carrier.3. The preferred co-solvent carrier,E6K-25%ET, could give a outstanding liquid rosemary antioxidant, with high performance of antioxidation, rapid oil solubility and good physical stability. The antioxidant activity of this liquid rosemary antioxidants was much better than that of BHT, BHA and natural VE, overcoming many shortcomings of other current rosemary antioxidants on the market. Therefore, the liquid rosemary antioxidant could be promoted and employed as a new type of antioxidant.4. The complex liquid rosemary antioxidant was formulated using soy lecithin, ascorbyl palmitate, citric acid monoglyceride and liquid rosemary antioxidants. It was showed that the antioxidant activity of the complex rosmary antioxidant was much better than those of BHT, BHA, natural VE and single Herbs(?)RA-OS100, but less than TBHQ. The complex rosemary antioxidants had a good heat resistance:complex rosemary antioxidant≈herbs(?)RA-OS100TBHQ> BHT> vitamin E, BHA.