共查询到18条相似文献,搜索用时 78 毫秒
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论述了不同实验条件对小麦降落数值测定的影响,以及影响测定值的主要原因。加水温度以及水质、样品称量、样品含水量对降落值的测定有影响,但样品的细度影响不大。 相似文献
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对小麦降落数值测定原理、试样制备、仪器调试等操作过程和技术要领进行阐述;分析探讨降落数值与小麦品质质量、储存时间的相关联系;提出入库加强降落数值测定,掌握麦粒发芽受损程度,按质分类分仓储存;科学保粮、及时推陈储新;合理搭配,满足需求. 相似文献
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对添加不同剂量α-淀粉酶的小麦粉样品进行降落数值(FN)、真菌降落数值(FFN)、糊化和烘焙面包的分析检验,通过分析实验数据的对应关系,确定烘焙效果较好时的真菌降落数值范围。从而在面包粉生产的重要环节———添加剂添加过程中,能利用真菌降落数值来控制α-淀粉酶的添加量,避免添加不足影响面包粉质量,也避免过量添加增加生产成本,造成浪费。实验表明:FFN值的范围在91~158 s时,烘焙效果较好,FFN值91 s时,综合烘焙效果达到最佳。 相似文献
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食品检验中称样量与检验结果的误差分析 总被引:1,自引:0,他引:1
通过在食品检验中的重量法和容量法和容量法中选取不同的称样量进行检验结果的相对偏差分析对比,讨论在食品检验中如何在标准规定的称样量范围内选取合适的称样量,以减小实际检验工作中检验结果的相对偏差。 相似文献
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Jinhua Wang Elke Pawelzik Joachim Weinert Qinghua Zhao Gerhard A. Wolf 《European Food Research and Technology》2008,226(6):1365-1371
The Hagberg falling number (HFN) is one of the most important quality characteristics of wheat. Six winter wheat cultivars
from three locations in Germany were analysed to assess the factors influencing the HFN. The cultivars and locations affected
significantly the HFN of all the samples. The infection with Fusarium culmorum, determined in another cultivar, also led to an increase in HFN, which suggested that the HFN method is not adequate enough
for the true determination of the alpha-amylase activity of fungus-infected, wheat flour. Furthermore, there was no clear correlation between HFN and thousand-kernel
weight, starch content or pentosan content. The crude protein content was positively related to the HFN, while the total dietary
fibre content depended on the cultivar and location. 相似文献
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Maryke Craven Annelie Barnard Maryke T Labuschagne 《Journal of the science of food and agriculture》2007,87(9):1783-1793
The influence of sudden cold spells during grain filling of wheat on the quality traits of three South African hard red wheat cultivars (Gariep, Elands and Tugela‐DN) was studied, with the emphasis on Hagberg falling number (HFN). Four treatments were used (?1 °C at soft dough stage, ? 1 °C at late milk stage, ? 4 °C at soft dough stage and ? 4 °C at late milk stage) and were administered for one night only. From the results it was concluded that, although limited in duration, such frost conditions did have an effect on the quality of the wheat cultivars. Cultivars differed in their response to the various treatments but also as to what quality traits were affected the most. The ? 4 °C at late milk stage resulted in significantly reduced HFN being measured for both Elands and Tugela‐DN. A similar effect was observed for Gariep, but was not statistically significant. Although the response was limited to the main tillers only, the conclusion was made that it is probable that the reduced HFN would be visible in the pooled sample of head and side tillers. A screening protocol was suggested that would allow classification of cultivars for frost tolerance. Copyright © 2007 Society of Chemical Industry 相似文献
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以3种商品小麦种子为研究材料,分别制取萌动前1 h(吸胀阶段)、萌动后1 h(种皮破裂)、萌动后4 h和原始样品,用显微镜观察其胚部结构,对其蛋白质含量、面筋和降落数值变化进行检测分析,探讨小麦吸胀阶段的质量变化情况。结果表明:吸胀阶段小麦的蛋白质含量、面筋含量及面筋指数没有明显的变化。吸胀阶段小麦的降落数值降低,但均在200 s以上且明显高于萌动后小麦,对其食用品质无不良影响,与萌动后小麦有根本区别。根据外观形态的变化(如胚部隆起)将吸胀阶段小麦认定为生芽粒的一种,并归属为不完善粒不符合生产实际,易引起质量纠纷。 相似文献
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针对陕北长城沿线葡萄栽培中存在的问题,根据葡萄的生长特性,结合多年的生产实践,总结并推广大棚葡萄绕蔓坠枝管理技术。对大棚修建、苗木栽植、引蔓、坠枝修剪、主蔓更新、投资成本及效益对比等主要环节加以介绍。该技术的应用不仅可实现北方葡萄冬季不下架埋土防冻,有效防止倒春寒袭击和秋季连阴雨烂果等问题,而且大大降低栽植及管理成本。与目前主推的大棚小龙干密植栽培相比,栽植成本降低75.7%;按单株需水量、需肥量、苗木价格相同计算,生产资料成本降低81.3%;修剪成本降低了73.2%,且产量提高40%。保证葡萄连年稳产丰产。 相似文献