Research On The Properties Of A Novel Sterols Organogels

The properties of a novel sterols organogels was determined by texture analyzer,polarizing microscope,rheometer,infrared spectroscopy,rapid liquid chromatography quadrupole time of flight mass spectrometry(LC-QTOF-MS),X-ray diffraction and differential scanning calorimetry while the diosgenin and the bonding mixture of diosgenin and ?-sitosterol was used as structurant.Studies have shown that the hardness of the organogels related to the concentration of diosgenin,holding temperature and holding time,the hardness increases when increasing diosgenin's concentration,5 ?>15 ?>25? with theholding time extended,the hardness first increases and then decreases.The hardness provided by diosgenin was equivalently 1.6 times as that of tristearin;the hardness provided by diosgenin and ?-sitosterol was equivalently 1.5 times as that of tristearin.Polarization microscope showed that the crystal microstructure in organogels revealed a dependence on strcturant composition and storage temperature,The diosgenin in the oil phase presented a new kind of self-assembly crystal structure with fibrous,when the ratio of diosgenin and P-sitosterol was 4:1,the crystal structure with turfed shape while the network filling most closely,the crystals developed at 5?were most closely and smallest.Rheological analysis showed that these gels are true gel;G' decreased with the increase of temperature;at the same storage temperature,G' was reduced as the strain increases.The hydroxyl bond was broaden and red-shifted when the diosgenin and the bonding mixture of diosgenin with ?-sitosterol were not completely melt,which indicated the formation of intermolecular hydrogen bonds.While they were completely melt,the stretching vibration of hydroxyl groups resulted in blue-shifted,and keto group appeared.Rapid liquid chromatography quadrupole time of flight mass spectrometry verified that oxidation generated cyclohexenone and cyclohexanone structure,which affected intermolecular hydrogen bonds.With the extension of storage time,the daily average transition rate from ?' to ?form was 1.66%,while in the bonding mixture of diosgenin with ?-sitosterol and the diosgenin sample,the ?' crystal increases,finally only ?' polymorph;the bonding mixture of diosgenin with ?-sitosterol accelerated crystallization,for the melting properties of the organogels,the bonding mixture of diosgenin with ?-sitosterol reduced melting enthalpy,and the diosgenin sample increased melting enthalpy.The hardness,adhesiveness,gumminess of margarine increased with the bonding mixture of diosgenin and P-sitosterol's concentration increased,cohesion was reduced,polyglycerol ester had the best emulsifying effectiveness when the emulsifier concentration was 0.7%,adding different emulsifiers appeared with various degrees of "post-hard" during storage,in which mono-di glyceride had most improvement to post-harden.