甜菜叶片表型与其产质量的关系

甜菜生产用种主要依靠进口,来源不同的品种表型各异,甜菜高产高糖的表型特征,是育种和栽培管理最直观和简捷的指标.本研究利用丰产和高糖两种类型的2对甜菜品种为材料,通过连续两年对不同类型甜菜营养生长期叶片的形态指标进行比较,分析各指标与甜菜产量和含糖的关系.研究结果表明,丰产型甜菜品种在整个生育期的叶片长度和生育前期叶面积...     

基于层次分析法的叶用甜菜种质资源观赏性评价

根据叶用甜菜品种的观赏特性,运用层次分析法初步建立叶用甜菜品种观赏价值的评价模型,包含叶梗、叶片和整体感3个方面共11个评价因子.结果表明:叶梗是评价叶用甜菜观赏价值的核心要素;叶梗色、叶梗厚、叶丛型是重要因子,分别以红、粉红、粉白叶梗,叶梗厚度厚和直立型叶丛为优良性状.利用该评价模型对8个甜菜品种进行观赏价值综合评价...     

论糖蜜稀释对煮糖的影响

糖蜜稀释在制糖企业生产当中起着举足轻重的作用,稀释的好坏程度关系到糖膏煮制的结晶率和结晶速度的提升,是制糖企业提升综合实力的重要因素.本文通过强化糖蜜稀释工作,进行不同的实验对比分析糖蜜稀释对乙、丙糖膏结晶率、煮炼时间等因素的影响,论述重视糖蜜稀释工作的重要性.     

赤砂糖中二氧化硫含量测定的不确定度分析

采用GB 5009.34-2016《食品安全国家标准食品中二氧化硫的测定》中蒸馏法对赤砂糖中二氧化硫进行测定,分析该方法不确定度来源,对不确定度各个分量进行评估.结果表明,测定赤砂糖中二氧化硫含量不确定度的主要来源为标准滴定溶液消耗的体积和重复性测量,当二氧化硫含量为0.053 g/kg时,扩展不确定度为0.0034 ...     

Optimization of Enzymatic Process Condition for Protein Enrichment,Sugar Recovery and Digestibility Improvement of Soy Flour

Soy protein is a valuable nutritional supplement for food and animal feed. While protein constitutes ~50 % of defatted soy flour (SF), it coexists with complex carbohydrates (30–35 %) which may have anti‐nutritional effects. An enzymatic process can remove the carbohydrate and produce protein‐enriched soy products. The hydrolysate with monomerized carbohydrates is valuable fermentation feedstock. In this study, Aspergillus niger and Trichoderma reesei enzymes were compared for use in the process. Effects of pH (3.2–6.4), temperature (40–60 °C), enzyme‐to‐SF ratio (0–2 ml/g) and SF loading (150–350 g/l) were evaluated for the enzymatic conversion of SF carbohydrate to reducing sugar (Y_RS) and total soluble carbohydrate (Y_TC) in the hydrolysate. Effects of these single factors and interactions between factors were investigated. Optimal pH and temperature were similar for both enzymes: pH 4.8 and 50–51 °C for Y_TC, and pH 5.1–5.2 and 48–51 °C for Y_RS. The two enzymes also gave similar protein contents in resultant soy protein concentrates, i.e., 74–75 % with 2 ml/g enzyme broth and 150 g/l SF, which were higher than the 64–68 % protein in commercial concentrates. A. niger enzyme was significantly more effective in carbohydrate conversion, achieving Y_RS = 75 % and Y_TC = 78 % with 2 ml/g enzyme and 150 g/l SF, higher than the Y_RS (30 %) and Y_TC (64 %) obtained with T. reesei enzyme. Monomerization was essentially complete in hydrolysate produced with A. niger enzyme.     

提高CCD糖液浓度测量系统精度的方法

为了实现糖液浓度的在线精密测量,在分析CCD测量原理的基础上,开发了基于ARM的糖液浓度测量系统,并分析了测量系统误差及对精度的影响;通过研究CCD信号边缘梯度特性,应用多项式插值的亚像素边缘检测算法提高了像素定位精度。实验结果表明,与传统的折光仪相比,该系统具有较高的分辨率和测量精度。     

Magnetic particles for sugar separation from sulphuric acid solution generated during nano‐crystalline cellulose production

Nano‐crystalline cellulose (NCC) is a renewable material having different applications ranging from drug delivery to a reinforcing filling agent in polymer synthesis. Concentrated sulphuric acid is used to hydrolyze cellulosic biomass to obtain NCC. Manufacturers are keen to reuse the diluted acid solution left after the process. However, the presence of mono and oligosaccharides makes it unsuitable for repeated use. About 99 % of these compounds have been successfully separated from the acid solution by employing NaOH‐treated magnetic particles developed during this investigation. It has been observed that by NaOH treatment, zeta potential of the magnetic particles could be increased from +11 mV to +37.5 mV; correspondingly, sugar removal efficiency was increased from 23.04 % to more than 99 %. Thus a direct correlation between the change in zeta potential of the particles and sugar separation efficiency has been observed.     

稀酸催化小麦秸秆分步水解研究

利用农作物秸秆水解产物酿造酒精是发展可再生能源的一条重要途径,促进秸秆组分中半纤维素和纤维素的高效、低成本水解转化是实现这一途径的关键和瓶颈。以小麦秸秆为原料,稀硫酸为催化剂,研究了秸秆组分中半纤维素和纤维素的分步水解工艺,通过正交试验优化了酸浓度、原料固含量、反应时间和反应温度等工艺条件,在优化的分步水解工艺条件下原料转化充分,还原糖得率较高。     

ABR-活性污泥法在制糖废水处理中的工程应用

制糖废水主要含有大量的有机物,COD和BOD浓度较高,同时还含有氮、磷、钾元素。采用ABR-活性污泥法工艺对其进行处理,ABR对COD去除率达到65%左右,出水COD为65 mg/L左右,直接运行费用为1.25元/m3。