排序方式: 共有131条查询结果,搜索用时 15 毫秒
11.
Implementation of quality control methods in conjunction with chemometrics toward authentication of dairy products 总被引:2,自引:0,他引:2
The implementation of novel and accurate quality and safety control methods in conjunction with chemometrics in various fields of science, particularly in food science, showed that this combination stands for a very powerful tool for detecting food authenticity. The latter reflects both geographic origin and variety. Dairy products, in particular, have repeatedly worried the public authorities in terms of authentication regarding origin and in view of the many illnesses occasionally due to products of specific origin. Therefore, the development of a robust and reliable system endowed with this discriminatory power (varietal and/or geographic) is of great importance, both in terms of public health and consumer protection. 相似文献
12.
Ioannis S. Arvanitoyannis & Persefoni Tserkezou 《International Journal of Food Science & Technology》2008,43(6):958-988
Although corn and rice waste can be hardly classified among the most hazardous waste, their treatment is very important in view of the great volume of waste materials involved. In this review article, an update is provided for most of the waste treatment techniques (composting, pyrolysis, gasification, combustion) used to alter the physical, chemical or biological character of the waste, to reduce its volume and/or toxicity and to make the waste safer for disposal. Furthermore, all current and potential uses of treated corn and rice waste such as fertilisers, biomass and biogas/biofuel are summarised. Four comprehensive tables and six figures provide a thorough presentation of both waste treatment methods (characteristics, advantages and disadvantages) and uses of treated corn and rice waste. 相似文献
13.
The effect of pH, temperature, dye concentration, and additives on the absorption of the dyes FD & C (Food, Drugs and Cosmetics) Blue 1 and Blue 2 upon poly(ethylene terephalate) (PET) and poly(butylene terephthalate) (PBT) subjected to different draw ratios (and, thus, resulting in different percentage crystallinities determined with DSC and wide-angle X-ray diffraction patterns) was investigated and a correlation between these parameters and the dye uptake was suggested. The absorption kinetics of the dyes on the polyesters were studied and a mechanism based upon the development of hydrogen bonds between the dyes and the end groups (? COOH,? OH) of the polyesters and the swelling of the network was proposed. Finally, an indirect measurement of the Tg values of the polyesters was suggested based upon the different dyeing diffusion rates. © 1994 John Wiley & Sons, Inc. 相似文献
14.
15.
The influence of concentration of the main organic acids such as tartaric, malic, citric, and succinic acids on the cation content (Ca, Mg, Fe, Cu, Zn and Mn) during treatment with optimum mass of two bentonites (Calcium and Calcium-Sodium) in synthetic wine, is studied. Only in case of succinic acid, a lower Fe absorption is observed, probably due to its weaker acid character, compared to other acids. 相似文献
16.
17.
18.
19.
Vegetable industries have been considered responsible for a great amount of pollution; hence, there has been a strong need for the optimization of vegetable waste treatment systems. The currently employed systems are numerous and fall in the following large categories; thermal processes, evaporation, membrance processes, anaerobic digestion, anaerobic co-digestion, biodiesel spraying, combustion, transesterification, coagulation, and composting. Respective methodologies in conjunction with waste treatment methods were presented per waste treatment method. The comparative presentation of the various vegetable waste treatment methodologies showed that though anaerobic digestion stands for the most enviromentally friendly technique, its required longer treatment time in conjuction with its weakness to deal with elemental contaminants makes imperative the employment of a second alternative technique which could either be a membrance process (low energy cost, reliability, reduced capital cost) or a coagulation/flocculation method because of its low cost and high effectiveness. Biogas production appears to be another promising and energy effective waste treatment method. On the other hand, methods like distillation and ozonation (high cost) and electrolysis (experimental level) have not been employed in the field. Finally, new waste management technologies have been described. 相似文献
20.
Y. Maeda K. Sakai A. Nakayama I. Arvanitoyannis N. Kawasaki K. Hayashi S. Aiba N. Yamamoto 《应用聚合物科学杂志》1998,68(13):2095-2106
The thermal properties and biodegradability of block copolyesterethers based on copoly[succinic anhydride (SA)/ethylene oxide (EO)] (polymer composition range SA/EO 42/58–49/51 mol %), synthesized by ring-opening copolymerization and poly(ethylene glycol) (PEG) or poly(propylene glycol) (PPG), were studied. The block copolyesterethers synthesized from higher than 7000 molecular weight (Mn) or high SA content copoly(SA/EO), SA/EO = 48/52 or 49/51, and PEG showed melting points and fusion heats (ΔH) similar to those of the prepolymers without leading to a microphase-separation structure. Enzymatic degradability of the block copolyesterethers synthesized from biodegradable copoly(SA/EO) with a low SA content (SA/EO = 42/58 mol %) and PEG was significantly smaller compared to that of the chain-extended copoly(SA/EO) used as a prepolymer. On the other hand, the block copolymers synthesized by an equimolar amount of copoly(SA/EO) and PPG showed evidence of a microphase-separation structure. An increase in propylene glycol (PG) content interfered with the formation of a microphase-separation structure. However, the block copolyesterethers including nonbiodegradable copoly(SA/EO), with a high SA content (SA/EO = 49/51 mol %), and PPG were found to be enzymatically degradable. In the biodegradation testing with standard activated sludge, the block copolyesterethers were degraded by microorganisms in activated sludge. The relationship between polymer composition and the biodegradation rate by activated sludge shows a similar trend to that of enzymatic hydrolysis. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 2095–2106, 1998 相似文献