排序方式: 共有32条查询结果,搜索用时 296 毫秒
1.
2.
3.
The rheological changes in rice noodles by the substitution of corn bran and the effect of temperature on the xanthophyll content (lutein and zeaxanthin) of the corn bran-rice flour noodles were evaluated. The use of corn bran increased the water holding capacity of rice flour at room temperature while the opposite results were observed after heating. The pasting parameters of rice flour-corn bran mixture were reduced with increasing levels of corn bran and the mixture paste exhibited more dominant liquid-like behavior. The noodles containing corn bran exhibited lower expansion ratio and softer textural properties. The levels of lutein and zeaxanthin in raw corn bran were 336.9 and 123.1 μg/100 g, respectively and were significantly reduced (P < 0.05) by heating. While lutein and zeaxanthin were not detected in the control noodles without corn bran, their levels in corn bran-incorporated noodles ranged from 56.2 to 137.3 μg/100 g and from 37.9 to 61.9 μg/100 g, respectively and were significantly reduced by 37.7–45.4% (P < 0.05) after cooking. Thus, the heat-labile characteristics of two xanthophylls were clearly observed. This study provides useful information on the processing performance and xanthophyll content of corn bran, possibly extending its use in a wider variety of foods. 相似文献
4.
5.
一种用于农业产业化经营决策的估计方法——农副产品需求的收入弹性估计方法 总被引:2,自引:0,他引:2
为了促进农业产业化经营决策的科学化,运用收入弹性理论,研究了我国农副产品需求的估计方法,探讨了农业产业化经营决策应遵循的思路。 相似文献
6.
7.
《Journal Of Aquatic Food Product Technology》2013,22(3):127-149
ABSTRACT The value of fish is largely dependent on fillet size and species but greater value could be obtained by finding commercial uses for the remaining fish frame, particularly fish by-products. Vitamin E and polyunsaturated fatty acids, particularly docosahexaenoic acid (DHA) and eicosapentaenoic (EPA), are of economic importance to the food and pharmaceutical industries and are available for extraction from fish waste. The objective of this study was to compare α-tocopherol levels and the fatty acid profile from several demersal species (cod, ling, saithe and haddock, n = 15) caught in Irish coastal waters over a one-year period (2001). α-Tocopherol levels in samples of liver, viscera and cut-off (any residual flesh from belly flap) were extracted and subsequently measured by high performance liquid chromatography (HPLC). Total fatty acids were extracted and determined by gas chromatography (GC). Results indicated that a-tocopherol levels in liver were higher (P < 0.05) than those in viscera or cut-off. Regardless of species, α-tocopherol levels were found in the following order: liver > viscera > cut-off. In general, α-tocopherol levels were highest in autumn and lowest in spring. Overall, percent free fatty acid levels recorded in liver and viscera samples were higher (P < 0.05) than those in cut-off samples. Percent free fatty acid varied significantly (P < 0.05) with each season, and was generally greater in autumn samples. An inverse relationship was observed between percent fat and moisture levels recorded in this study. The major fatty acids identified in each fish species and each by-product were 16:0 (palmitic), 18:0 (stearic), 18:1 (oleic) 20:5n-3 (eicosapentaenoic acid, EPA) and 22:6n-3 (docosahexaenoic, DHA). The highest percent of total identified fatty acids were reported in the autumn catch, including the highest EPA and DHA levels. Overall, liver samples had the highest levels of EPA and DHA. 相似文献
8.
In the last decades, worldwide biofuel production increased up to 105 billion liters in 2010; in this year, the world's first biodiesel producer was the European Union. Biodiesel is produced from a variety of oils, mainly soybean, Brassicaceae and sunflower. One of the most important biodiesel production byproducts are seed meals. The most common use of seed meals is for animal nutrition, but another potential use is agricultural soil organic amendments. Soil biological and biochemical properties have been widely used as soil quality indicators, due to their quick response to changes in soil management. Although there are many studies on the effects of regular amendments on respiration and enzymatic activities of the soil, very few papers refer to the effect of seed meals. Therefore, the aim of this study was to investigate the short-term effect of seed meal amendment on soil respiration and enzymatic activities (alkaline phosphatase, dehydrogenase, fluorescein diacetate hydrolase, arylsulphatase and β-glucosidase). The two seed meals used were obtained from Brassica carinata (A.) Braun (Ethiopian mustard) and sunflower (Helianthus annuus L.). The study was carried out, from June 2007 to October 2007, at an experimental farm of CRA-ORT, Battipaglia, in the Sele River (Plain Salerno, Campania Region, Italy). The results of this study support an alternative use of seed meals as organic amendments. Generally, a significant positive response of enzymatic activities, evaluated in this study, to the addition of seed meals, indicates a beneficial effect on soil quality as regards microbial activity. 相似文献
9.
With the worldwide increase of fisheries, fish wastes have had a similar increase, alternatively they can be seen as a source of novel substances for the improvement of society’s wellbeing. Elasmobranchs are a subclass fished in high amounts, with some species being mainly bycatch. They possess an endoskeleton composed mainly by cartilage, from which chondroitin sulfate is currently obtained. Their use as a viable source for extraction of type II collagen has been hypothesized with the envisaging of a biomedical application, namely in biomaterials production. In the present work, raw cartilage from shark (Prionace glauca) and ray (Zeachara chilensis and Bathyraja brachyurops) was obtained from a fish processing company and submitted to acidic and enzymatic extractions, to produce acid-soluble collagen (ASC) and pepsin-soluble collagen (PSC). From all the extractions, P. glauca PSC had the highest yield (3.5%), followed by ray ASC (0.92%), ray PSC (0.50%), and P. glauca ASC (0.15%). All the extracts showed similar properties, with the SDS-PAGE profiles being compatible with the presence of both type I and type II collagens. Moreover, the collagen extracts exhibited the competence to maintain their conformation at human basal temperature, presenting a denaturation temperature higher than 37 °C. Hydrogels were produced using P. glauca PSC combined with shark chondroitin sulfate, with the objective of mimicking the human cartilage extracellular matrix. These hydrogels were cohesive and structurally-stable at 37 °C, with rheological measurements exhibiting a conformation of an elastic solid when submitted to shear strain with a frequency up to 4 Hz. This work revealed a sustainable strategy for the valorization of fisheries’ by-products, within the concept of a circular economy, consisting of the use of P. glauca, Z. chilensis, and B. brachyurops cartilage for the extraction of collagen, which would be further employed in the development of hydrogels as a proof of concept of its biotechnological potential, ultimately envisaging its use in marine biomaterials to regenerate damaged cartilaginous tissues. 相似文献
10.