Advanced Materials Research Vols. 634-638

Abstract: The capillary electrophoresis (CE) is a powerful analytical technique in analytical chemistry and bioanalytical chemistry due to its high resolution, minimal sample requirements and low operating costs. Recent advances of application of CE for the analysis of traditional Chinese medicine is critically reviewed in this paper. After a simple discussion of the mode of separation and detection, special attention is focused on application of CE techniques and strategies for the qualitative and quantitative analysis in traditional Chinese medicine.

Abstract: In the process of Biomedicine PV Grid, in order not to affect the quality of the grid, must ensure that the output current of photovoltaic power generation system and grid voltage maintain a high degree of consistency in the frequency, phase and amplitude. In order to make the output current of PV Grid inverter to meet the relevant standard of the grid, the appropriate grid filter and control strategy is the key. In order to improve the quality of the grid current and reduce the pollution of the grid harmonic current on the grid, select the three-phase full-bridge inverter circuit with LCL filters. In the grid control strategy, select the double loop current control based on grid current and capacitance current, and introduce the PR control into the double loop control system, analyze that PR control can achieve zero steady state error tracking of grid sinusoidal reference current and anti-grid voltage disturbances. Make double loop current control and SVPWM control combined, and prove the stability of this method through the simulation experiment.

Abstract: The impact of activator varieties on the activation effect in preparing activated carbon with corncob adopting chemical activation process were researched in this paper, the results showed that phosphoric acid as the activator was much better than potassium hydroxide and zinc chloride. It was deduced from the orthogonal experiment results that the impact of activation temperature on the activation effect is the greatest, impregnation ratio takes the second place, and the activator concentration the least. Suitable parameters of activation process were obtained: when the activator concentration is 50%, activation temperature 500°C, impregnation ratio 2.7:1, the iodine value of activated carbon is 822.08mg/g.

Abstract: The relationship of adsorption characteristic about active carbon and the haze in clarified apple juice was investigated. Particle size and addition and adsorption temperature of active carbon were studied.0.18mm particle size with the biggest specific surface area and 0.075mm particle size with the widest microspore distribution of active carbon lowered the turbidity and contents of haze active protein and that of haze active phenolics. Contents of haze active protein and that of haze active phenolics in apple juice were decreased by increasing the adding amounts of active carbon. High temperature of adsorption showed the positive relationship with volume of haze active phenolic and the negative relationship with volume of haze active protein. Particle size of active carbon with 0.18mm or 0.075mm and addition of 15g/kg and adsorption temperature with 50°C are chosen in reducing the haze in apple juice. Absorbability of active carbon has great effects on the haze of apple juice.

Abstract: Eggshell calcium citrate (ESCC) prepared by pulsed electric field (PEF) may be a new calcium resource to help treat and prevent calcium deficiency. An absorption assessment of ESCC prepared by PEF was performed in male mice with apparent calcium absorption. Compared with control group, ESCC prepared by PEF at doses of 133.0 mg/(kg•d) significantly improved the alkalinity phosphatase (ALP) activity (P < 0.05) and decreased the levels of tartrate-resistant acid phosphatase (TRAP) (P < 0.05). The ratio of calcium and phosphorus were in the normal range. Therefore, ESCC prepared by PEF could promote the absorption of calcium in mice.

Abstract: The aim of this work was to determine the inhibitory effect of deer blood hydrolysates addition on lipid oxidation, color deterioration and microbial contamination of ground beef during during 9 days of refrigerated storage. The pH value, total plate count, thiobarbituric acid-reactive substances value (TBARS), total volatile basic nitrogen (TVB-N) and color were also determined. The results showed that the treatments added hydrolysates had significant inhibitory effects on lipid oxidation and kept the red color of ground beef in 9 days, when compared with controls (P < 0.05). Furthermore, the inhibitory effect enhanced as the adding level of the hydrolysates increased (P < 0.05). These results suggest that deer blood hydrolysates are good source of natural antioxidants.

Abstract: The aim of the work was to research antioxidant activity of the anthoyanins extracts of black soybean. The whole soybean through defatted, were to determine the phenolic and anthocyanin contents in black soybean extracts and to examine antioxidant activity of extract against DPPH and ABTS assays, and Ferric Reducing Antioxidant Power (FRAP), and superoxide anion radical scavenging activity. The defatted sample was extracted using ethanol by ultrasonic. The optimum DPPH and ABTS radical scavenging capacity (%) were 68.34% and 70.12%, VC was 59.76% and 95.23%, respectively, and contains high levels of reducing power and superoxide anion radical scavenging activity. The present results indicate that the anthoyanins extract from black soybean has greater anti-oxidative and is useful in functional food and other applications.

Abstract: The galactooligosaccharide (GOS) was produced by Bulgarian lactic acid bacteria fermentation and further refined by application of an ultrafiltration-nanofiltration continuous membrane combination technology established in this paper. Results revealed that the optimum of membrane operation conditions for ultrafiltration were 0.05 Mpa at the feed concentration of 2.5 g/L, and the optimal conditions for nanofiltration were 45 °C, 0.4 Mpa. After refining by membrane combination technology, 96.70% of proteins were removed and the relative quality ratio of the refined GOS product was increased by 22 times or so, which mainly contained oligomers with DP 3 and DP 2, and mostly distributed between 108 Da and 2415 Da. These findings suggest that the ultrafiltration-nanofiltration continuous membrane combination technology is a new and favorable processes method for enrich or refining of milk-derived GOS obtained by fermentation.

Abstract: Deer blood was hydrolyzed using Alcalase with hydrolysis time ranged form 0 to 6 h, and the degree of hydrolysis (DH) of protein hydrolysates increased with increasing hydrolysis time (P < 0.05). The reducing power, radicals scavenging activities and Cu2+-chelation ability of deer blood hydrolysate (DBH) significantly enhanced with increasing hydrolysis time (P < 0.05). The antioxidant activity of DBH, indicated by thiobarbituric acid-reactive substance (TBARS) values in a liposome-oxidizing system, increased with increasing DH (P < 0.05). The results indicated that antioxidant activity of DBH depended on hydrolysis time, and the hydrolyzed deer blood could be a potent food antioxidant.

Abstract: Inactivation of polyphenol oxidase (PPO) and peroxidase (POD) in hami melon juice by treatment with dense phase carbon dioxide (DPCD) was investigated. DPCD treatment (60min, 35MPa 65°C), caused 79% and 81% loss in PPO and POD activities, respectively. The inactivation dynamics followed the first-order reaction kinetics. Higher pressures or temperatures resulted in higher inactivation constants. The treatment time needed for 90% inactivation and the activation energies for PPO and POD decreased in the presence of DPCD, compared with a 65°C thermal treatment. Pressure sensitivity at 65°C was also investigated. The results proved that DPCD was effective for inducing enzyme inactivation in hami melon juice.