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Cereal biomacromolecules are an important source not just of calories but also of functional ingredients in foods and as raw materials for biodegradable nonfood applications. Their important role is evidenced by an ever‐increasing number of peer‐reviewed publications on these topics. Current research is increasingly focused on understanding the fine structure of the macromolecules and their interactions with other ingredients within a food matrix for their impact on health. Furthermore, these learnings about the fine structure and interactions have relevance to functionality in nonfood applications. This focus issue attempts to summarize the state of the knowledge and research gaps related to the three major biomacromolecules in cereals: starch, proteins, and nonstarch polysaccharides (dietary fiber). Click on Current Issues on left and then July/August 2013 to view the articles in this Focus Issue. (From the Mobile site, go to the July/August 2013 issue.) 相似文献
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Oat β‐glucan enriched extruded cereals with molecular weights (MWs) ranging from 2,180,000 to 326,000 were produced. Test meals composed of 31 g of available carbohydrate, 8.3–8.7 grams of β‐glucan, and milk were administered to subjects and their postprandial blood glucose levels monitored for 2 hr. White bread plus milk and a control wheat bran cereal plus milk were administered, and white bread alone served as a reference food for estimation of glycemic index (GI) of the cereals, after adjusting for the effect of adding milk to white bread. Both oat bran and wheat bran cereals significantly reduced peak blood glucose rise (PBGR) and area under the curve (AUC) versus white bread alone or white bread plus milk. There was a significant inverse relationship between AUC and log10[weight average MW] (r2 = 0.96, P = 0.0192). There was a significant inverse relationship between PBGR and log10[viscosity] of in vitro extracts from all cereals, including the wheat control (r2 = 0.96, P = 0.0031). However, no significant differences in glycemic responses among the oat bran cereals were found with pairwise comparisons. All cereals were low GI (<55) and were significantly lower than white bread alone or white bread plus milk. Among the oat bran cereals, palatability was positively correlated with MW (r2 = 0.98, P = 0.0110). 相似文献
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近几年建瓯市奶牛养殖业发展迅速,短期内出现了牧草供应紧张和占用良田种植牧草的现象。为此,福建省水土保持试验站和建瓯市水土保持试验站积极探索在荒坡地、老茶果园和工程开挖、堆弃土边坡等水土流失地种植Ⅱ系狼尾草的开发利用,引种获得成功。本文分析了种植Ⅱ系狼尾草的效益,并总结其种植技术与管理经验,为推广种植提供参考。 相似文献
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Abstract. Pollution by inorganic and organic substances is increasingly disrupting the natural functions of soils. Some soils seem capable of receiving and holding chemical compounds, at the same time retaining their ecological flexibility, but others are readily damaged and should be regarded as vulnerable to particular pollution scenarios.
At the request of the Chemical Time Bombs (CTB) Project, the International Soil Reference and Information Centre (ISRIC) organized an international workshop to assess the feasibility of increasing awareness of 'soil vulnerability' by a mapping exercise for Europe (SOVEUR), at a scale of 1:5 M, with reference to selected organic and inorganic contaminants. The workshop participants outlined procedures for a GIS-based approach to determining areas where vulnerable soils occur, and formulated proposals for the implementation phase of the SOVEUR programme. Funding is now sought for continuation of the work outlined in this paper. 相似文献
At the request of the Chemical Time Bombs (CTB) Project, the International Soil Reference and Information Centre (ISRIC) organized an international workshop to assess the feasibility of increasing awareness of 'soil vulnerability' by a mapping exercise for Europe (SOVEUR), at a scale of 1:5 M, with reference to selected organic and inorganic contaminants. The workshop participants outlined procedures for a GIS-based approach to determining areas where vulnerable soils occur, and formulated proposals for the implementation phase of the SOVEUR programme. Funding is now sought for continuation of the work outlined in this paper. 相似文献
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禾谷类作物是最重要的粮食作物,为人类提供了必需的营养物质,淀粉、脂肪、蛋白质、维生素和矿物质作为谷物的主要营养素,其含量是培育健康谷物的关键。为给育种研究中有效提升禾谷类籽实的营养品质及谷物的有效利用提供参考,并为培育更具全面营养的谷物提供理论依据,从饮食源头上为人类健康保驾护航。本文基于近年来相关文献资料的梳理归纳,对几种主要的禾谷类作物小麦、大麦、燕麦、水稻和玉米中的几种主要营养素含量进行比较分析,对影响这些营养物质含量和品质的遗传因素进行分析总结,认为小麦、大麦、燕麦、水稻、玉米等禾谷类籽实所含的各类营养物质有较大差异,不同物种遗传背景的差异是导致不同禾谷类籽实营养物质差异的根本原因,而在进化过程中基因突变的平行性又是导致禾谷类籽实中相同营养元素被同类基因编码调控的直接原因。 相似文献
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H. M. ApSimon S. Couling D. Cowell R. F. Warren 《Water, air, and soil pollution》1995,85(4):1891-1896
European emissions of reduced nitrogen, arising principally from agriculture, are comparable with those of oxidised nitrogen from mobile and stationary combustion sources. It is therefore important to include ammonia emissions in working towards a new protocol on nitrogen under the programme of the UN Economic Commission for Europe on the control of transboundary air pollution. However the nature of the sources and the subsequent atmospheric transport and chemistry are very different from other acidifying pollutants. This paper describes work in hand under the MARACCAS project to compare agricultural activities in different European countries and to assess the applicability and efficacy of potential abatement measures. The aim is to derive abatement costs for each country relating successive emission reductions to the costs of achieving them, to be used by the UN ECE Task Force on Integrated Assessment Modelling (TFIAM) — in particular with our Abatement Strategies Assessment Model, ASAM. The paper will also address the large uncertainties involved in integrated assessment modelling with respect to ammonia, and suggest how these may be allowed for in deriving cost-effective abatement strategies. 相似文献
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Coppola L Castillo Md Monaci E Vischetti C 《Journal of agricultural and food chemistry》2007,55(2):396-401
Biobeds developed in Sweden bind and degrade pesticides from point sources. The objective of this work was to adapt the biobed to Italian operating conditions, for example, to identify organic materials as effective as those in the original Swedish composition. The capacity of urban and garden composts alone or mixed with citrus peel or straw to degrade chlorpyrifos and its metabolite TCP was compared to the typical Swedish biomix consisting of straw, peat, and soil. A tendency for higher 14C-chlorpyrifos mineralization and lower TCP levels was observed in the biomixes with garden compost alone or amended with straw. In a second trial, a high correlation of lower TCP with increasing levels of straw in typical Swedish biomixes was observed. Straw stimulates production of lignin-degrading enzymes such as manganese peroxidase (MnP), and further trials with pure MnP showed that this enzyme degrades TCP. Materials with an active lignin-degrading microflora are a prerequisite for effective dissipation of chlorpyrifos and non-accumulation of TCP. Thus, lignocellulosic materials as straw and garden composts should be present in biomixes to be used under Italian conditions. 相似文献
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《Cereal Chemistry》2017,94(1):151-157
The development of innovative legume‐enriched rice products is a promising way to exploit rice varieties with a low sensory grade. In this work, a multidisciplinary approach was applied to the characterization of extruded breakfast cereals prepared from African‐grown Oryza glaberrima (cv. Viwonor) or Oryza sativa (cv. Jasmine 85) enriched with 30% cowpea flour, obtained from sprouted or nonsprouted cowpea. Regardless of the rice species, addition of sprouted cowpea flour conferred a peculiar volatiles profile, rich in sour, bitter, and astringent taste. Protein structural indices provided molecular insights about the macroscopic differences among samples. Extruded products from O. glaberrima were characterized by lower expansion rates with respect to those obtained from O. sativa , regardless of the type of cowpea flour. Sprouting time had a positive influence on the hardness of extruded glaberrima‐based products, facilitating formation of a more compact matrix, but it did not influence sativa‐ based products. Therefore, the breakdown of protein during sprouting appeared fundamental for the incorporation of legume proteins in more compact matrices, such as the one from sativa rice. In the glaberrima‐based products, addition of sprouted cowpea resulted in further loosening of the structure, and this was more evident at increased sprouting times. 相似文献
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Tiiu Kull 《Biological conservation》2006,129(1):1-3