Advanced Materials Research Vol. 700

Abstract: Effect of four materials including trehalose, soluble starch, raffinose and galactose on survival of Lactobacillus acidophilus was studied by counting viable cells before and after freeze-drying. The concentrations of five carbohydrates were all 3%, 6%, 9%, 12% and 15%. Results showed as follows: the optimal concentrations of trehalose, soluble starch, raffinose and galactose were 12%, 9%, 3% and 15%, the survival of Lactobacillus acidophilus was 42.62%, 56.50%, 45.05% and 42.69% and the viable cells of lyophilized powder were 0.40×10¹¹cfu/g,0.45×10¹¹cfu/g, 0.52×10¹¹ and 1.09×10¹¹cfu/g, respectively.

Abstract: Tilapia (Oreochromis niloticus) protein was hydrolysed by papain, and then the tilapia (Oreochromis niloticus) protein hydrolysates (TPH) chelated with ferrous ions at various mass ratios of TPH to FeCl₂ (5:1, 10:1 and 20:1) to obtain the biological materials of chelate I, chelate II and chelate III, respectively. The ferrous-binding rate and antioxidant activities of the chelates were investigated. It was found that the ferrous-binding rate increased with the increase of mass ratios (TPH/FeCl₂) from 5:1 to 20:1. The DPPH radical scavenging activity and reducing power activity of chelate III were highest in the chelates, and the lipid peroxidation inhibition activity of the chelate III was obviously higher than that of TPH. Compared with TPH, marked changes in microstructure were observed in the biological material of TPH-iron chelate.

Abstract: Study on characteristics and formation mechanism of inland saline water is conducive to develop and utilizing saline water resources scientifically and reasonably. Taking alluvial plain of the Yellow River in the Northwest of Shandong as an example, based on experimental data, chemical composition and spatiotemporal variation characteristics of inland saline groundwater are discussed and its formation mechanism is revealed. Result shows old interchannel belt, sullen water flow, high evaporation and different hydro-geochemistry functions are formation conditions of high salinity saline water in inland area. From the mainstream of old channel to saline water area of interchannel belt, groundwater hydro-chemistry type by HCO3- evolves into the Cl.SO₄ -Mg.Na.Ca type and Cl.SO₄-Na.Mg.Ca type gradually.Thus, improving measures such as pumping saline water in non-flood season and treating water with reverse osmosis material and so on are put forward to make the saline water evolve into fresh water.

Abstract: The recognize of hydrogeological conditions is not clear, and there has always been states of dry up in Jinan spring. This paper divides jinan monoclinic structure into three primary ground water systems, and three secondary karst water subsystems based on the groundwater system theory. On that basis, reveal the recharge source of Jinan springs through the analysis of regional aquifer medium and hydrodynamic characteristic, further confirm that the hydraulic connection of western suburb is better close with downtown than that of eastern suburb by regression analysis method, so the recharge well can be designed and allocated in western suburb to recharge groundwater.This paper introduces inverted filter's materials needed by recharge well such as quartz sand and limestone, as well as advantages and disadvantages of them. These conclusions provide scientific basis for spring protection and the mining of karst water with high quality.

Abstract: In this work, a new crystalline PEO cross-linked CD films combining PEO and CDs (α-CD and β-CD) was prepared, and their compositions (CD/PEO; wt/wt) ranging from 1/99 to 6/94. The hydroxyl groups of PEO with M_n of 20,000 were converted to chlorine groups through reaction with thionyl chloride. PEO cross-linked CD films with various compositions were successfully prepared via the epoxy-amine reaction between amino-CD and PEO-epoxy. The thermal and swelling behavior were studied for the PEO cross-linked CD films. It was found that the cross-linked PEO films form hydrogel in water, achieving a swelling ratio higher than 20 times of original weight. The swelling properties of these cross-linked films depend on the fraction of CDs. The crystallinity of these films was very high, and crystallization rate of PEO was accelerated by cross-linking with CDs.

Abstract: Effect of four emulsifiers including Tween 20, Tween 40, Tween 60 and Tween 80 on emulsifying effectiveness of phytosterol adding to milk was studied by single factor and orthogonal experiment. The concentrations of four emulsifiers were all 0.2%, 0.3%, 0.4%, 0.5%, 0.6% and 0.7%. The optimal emulsified conditions showed as follows: the optimal concentrations of Tween 20, Tween 40, Tween 60 and Tween 80 were 0.40%, 0.40%, 0.20% and 0.30%, respectively, the emulsification R reached 1.043 under the conditions mentioned above.

Abstract: Effect of hot water extract (HWE) from Fructus tribuli on growth of Lactobacillus casei, Lactobacillus reuteri, Lactobacillus rhamnosus and Lactobacillus bulgaricus with material properties was studied by measuring optical density at 600nm (OD₆₀₀) and pH using MRS media as the control. The addition of HWE (v/v) was 1%, 2%, 3%, 4% and 5%. Results were as follows: addition of HWE has the significant inhibition on growth of Lactobacillus reuteri and Lactobacillus bulgaricus and the significant promotion on growth of Lactobacillus casei and Lactobacillus rhamnosus. The optimum concentration of HWE in MRS media was 2% for Lactobacillus casei and 3% for Lactobacillus rhamnosus, respectively.