Study On The Modification Process And Physichemical Properties Of Soybean Residue Insoluble Dietary Fiber

Every year our country brings and consumes plenty of soy bean, so there will be lots of soybean residue and soybean hull, much of which have not been well developed and used, only a little of which have been used as feed or fuel, or even scraped. The low utilization also caused great pollution to environment. This paper takes soybean residue as material and studies its insoluble dietary fiber modification technology and its physichemical properties. The whole data from experimentations provides theoretic gist for the synthetically using of soybean residue. The following are the main contents and results of the test.1. Determine of modification process:take the water binding capacity as examine items and using chemical method to modify insoluble dietary fiber on the soybean residue. The single-factor experiment has been done after screening best Modify reagents. It has been shown from the orthogonal test that the optimum modification process is respectively 0.1%for concentration of disodium hydrogen phosphate,50℃for heating temperature,60minute for heating time and 1:60 liquid ratio. The hydration characteristics of soybean residue insoluble dietary fiber have significantly increased after modification.2. The physichemical properties of insoluble dietary fiber on the soybean residue were water-binding capacity 11.95g/g, swelling force capacity 17.90ml/g, combining water capacity 7.1g/g, and fat binding capacity4.35g/g. The modified products has a better properties then before and the physiological functions enhanced.3. Analyze the NO2- adsorption capacity at 37℃under adsorption pH=2,3,5,7 and the soybean residue insoluble dietary fiber adsorpt 56umol/g,53umol/g,40umol/g and 34umol/g, respectively. The results showed that the NO2- absorption capacity of the soybean residue insoluble dietary fiber pull down when pH increased.4. It has been shown from the study that the soybean residue insoluble dietary fiber have adsorption capacity on six heavy metal ion. The adsorption capacity was Pb2+ 0.524 mmol/g, Cu2+ 0.456 mmol/g, Zn2+ 0.040 mmol/g, Fe3+ 0.019 mmol/g, Mg2+ 0.190 mmol/g, Ca2+ 0.303mmol/g.5. The structural characteristics of modified dietary fiber:①The modified dietary fiber and market dietary fiber has a high degree of consistency on the basic structure. It is mainly reflected in the infrared spectra, both them have characteristic absorption peaks of polysaccharide and has a peaks of phosphate group at 1000-1100 cm-1.②The X-ray diffraction show that the modification reagents may make decreased on crystallinity and polymerization degree and make the structure of the product looser, but the change to the structure was limited view from the crystallinity. ③DSC curve shows that the modified dietary fiber are single, and pure, can adsorbed more water.④Scanning electron microscopy showed that the modified dietary fiber are smaller then market dietary fiber and the surface of the tiny grain is gassy, fold, conspicuous laminated structure and has cellular structure.In conclusion, proved by the results of X-RD, DSC, SEM, the sodium hydrogen phosphate can do same modification on the structure of soybean residue insoluble dietary fiber under this process condition. The hydration properties and adsorption characteristics have been improved effectively after modification. We can predict that the physiological functions and food processing characteristics will be further improved. The modification Process of the soybean residue insoluble dietary fiber is simple, low cost and has value for development.