共查询到20条相似文献，搜索用时 250 毫秒
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几十年来，世界各地的工程技术人员一直在设法设计一台能够生产高质量糖晶体的连续分蜜机，原糖（作精炼糖厂原料或直接消费）和白糖用户提出的严格的质量标准。因为间歇分蜜机可生产较高纯度和不损的砂糖晶体，传统上一直由间歇式分蜜机担当此任。倾向于将连续分蜜机用于生产较低纯度的糖，此外，与外壳发生高能量碰撞时会造成晶体被损。而且，连续分蜜机所产砂糖较湿且含块状糖。1993年STG工程公司为澳大利亚的CSR有限公司制造了一台样面，用于分蜜澳大利亚中糖膏和乙糖膏，该机可生产国际上各精炼糖厂用于生产高级糖的原糖，该机所生产的高级糖并无先前遇到的质量问题，在此不久，也为Manildra Harwood精炼糖厂制造了一台白糖样机，用于生产高级精炼白砂糖的甲糖膏，乙糖膏和丙糖膏分蜜。 相似文献
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几十年来,世界各地的工程技术人员一直在设法设计一台能够生产高质量糖晶体的连续分蜜机。原糖(作精炼糖厂原料或直接消费)和白糖用户提出的严格的质量标准。因为间歇式分蜜机可生产较高纯度和不损的砂糖晶体,传统上一直由间歇式分蜜机担当此仃。倾向于将连续分蜜机用于生产较低纯度的糖,此外,与外壳发生高能量碰撞时会造成晶体破损。而且,连续分蜜机所产砂糖较湿且含块状糖。1993年STG工程公司为澳大利亚的CSR有限公司制造了一台样机,用于分蜜澳大利亚甲糖膏和乙糖膏。该机可生产国际上各精炼糖厂用于生产高级糖的原糖。该机所生产的高级糖并无先前遇到的质量问题。在此不久,也为Manildra Harwood精炼糖厂制造了一台白糖样机,用于生产高级精炼白砂糖的甲糖膏、乙糖膏和丙糖膏分蜜。 相似文献
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自1991/1992年榨季以来,我区部分糖厂先后使用南宁市檀香助剂厂生产的TZ—2003、TZ—3006蔗糖酯以代替太古油、红油粉作消泡剂和降粘剂,收到很好的效果。 蔗糖酯是由蔗糖与各种脂肪酸基化合而成的一类有机化合物,是一种活性极强的表面活性剂。据调查了解,南康、宁明、东门、 相似文献
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以大豆油制取牛物柴油的副产物甘油为原料,在乙酸的催化下与HCI反应合成出3-氯-1,2-丙二醇,在二氯甲烷溶剂中再与NaOH反应制得缩水甘油,通过气相色谱测定两步反应的产率分别为84.6%、89.6%,并用红外光谱进行了结构鉴定.将合成的缩水甘油与十二胺在碱催化下制备了不同聚合度的十二胺聚甘油醚表面活性剂,产率大于80%;以FTIR、ESI-MS确认了该表面活性剂的结构.用吊环法测定了该表面活性剂水溶液在25℃时的表面张力,考察了不同聚合度对其表而化学性质的影响.结果表明:十二胺二聚甘油醚、四聚甘油醚、六聚片油醚水溶液的临界胶束浓度cmc(mmol·L-1)分别为0.32、0.055和0.20,先减小而后增大;最低表面张力γcmc(mN·m-1)分别为28.46、29.41和34.02,逐渐增大.该表面活性剂还具有良好的乳化、润湿及泡沫性能. 相似文献
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目前我国制糖设备、工艺滞后，制糖成本高，产品质量低，制约了蔗糖业的发展。新型的甘蔗以质论价设备、自动卸蔗输送机设备、甘蔗渣干燥设备、铸钢压榨辊、连续助晶、煮糖设备，全程自动控制的应用，可提高制糖行业的竞争力。 相似文献
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Cactus pear fruit: A new source for a natural sweetener 总被引：2，自引：0，他引：2
Sáenz C. Estévez A. M. Sepúlveda E. Mecklenburg P. 《Plant foods for human nutrition (Dordrecht, Netherlands)》1998,52(2):141-149
The use of cactus pear ( Opuntia ficus indica L.) to obtain a new natural liquid sweetener was studied. The juice of the fruit (16.5 ° Brix) was clarified with enzymes, treated with active carbon to take out the color and vacuum concentrated to obtain a 60 °Brix syrup or liquid sweetener. Physical and chemical characteristics determined included: aw; reducing sugars (as inverted sugar); glucose (%); ash content (%); sugar composition by TLC; OD (420 nm) and Y, x, y chromaticity coordinates; viscosity (cps) and density (g ml-1). Sensory analyses to determine the relative sweetness were also conducted. Cactus pear syrup contained 52.38% reducing sugar. The syrup had a pH of 4.31, a viscosity of 27.05 cps, an Aw of 0.83, a density of 1.2900 g ml-1, an acidity (as citric acid) of 0.74% and an ash content of 1.4%. Compared with traditional sweeteners such as fructose and glucose syrup, the acidity was greater than that of HFCS (high fructose corn syrup) of 0.035%, and the ash values were considered a little high compared to glucose syrup which is 1.0%; these disparities can be attributed to the different processing conditions employed. Sensory evaluation revealed the same relative sweetness for cactus pear syrup and glucose, but lower than fructose; cactus pear syrup had a relative sweetness value of 67 with respect to sucrose (100). 相似文献
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外源糖可以缓解盐害,提高植物耐盐性。为探究外源糖对盐胁迫下小黑麦幼苗糖代谢的影响及其机理,以小黑麦品种东农8809为材料,通过施加0.5mmol·L~(-1)葡萄糖和0.5mmol·L~(-1)蔗糖,探讨了100mmol·L~(-1) NaCl胁迫下外源糖处理的小黑麦幼苗相对电导率、碳水化合物含量和糖代谢关键酶活性的变化。结果表明,在盐胁迫下,与未经外源糖处理(CK)相比,外源葡萄糖、蔗糖预处理的小黑麦幼苗叶片的相对电导率显著降低,可溶性糖含量及蔗糖合成酶、蔗糖磷酸合成酶、果糖-6-磷酸激酶和己糖激酶活性提高,尤其是己糖激酶活性显著高于其他处理,丙酮酸激酶活性降低。说明盐胁迫下,施加外源糖可以促进蔗糖和葡萄糖进入蔗糖合成途径和糖酵解途径,促进淀粉向可溶性糖转化,从而提高可溶性糖含量,降低渗透势,提高细胞吸水能力,以缓解盐胁迫对小黑麦的伤害程度。 相似文献
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本文以蔗糖脂肪酸三酯（sucrose fatty acid triester，STE）和磷脂酰胆碱（phosphatidylcholine，PC）为原料制备蔗糖酯磷脂复合物，并通过傅里叶红外光谱分析（Fourier infrared spectrum，FT-IR）、热重分析（thermogravimetric analysis，TGA）和差示扫描量热分析（differential scanning calorimetry，DSC）对制备的蔗糖酯磷脂复合物进行表征分析；以STE为吸附脱磷剂，考察STE在菜籽油脱磷工艺中的应用。研究结果表明，STE与PC在无水乙醇体系中形成了新型的STE-PC复合物，与STE和PC相比，STE-PC复合物具有更低的相变熔融温度；另外，STE对菜籽油中的磷脂有一定的吸附脱除作用，在脱磷温度为55oC、STE添加量为3.5%、脱磷时间为30min条件下，脱磷率可达37.2%。 相似文献
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腐植酸浸种对盐胁迫下小麦萌发种子及幼苗生理特性的影响 总被引：4，自引：0，他引：4
为研究盐胁迫下腐植酸浸种对小麦幼苗生理特性的影响,采用春小麦品种龙麦26和克旱16为试验材料,分别用清水和腐植酸浸种,测定了NaCl胁迫下萌发种子的α-淀粉酶活性、幼苗根系和叶片的总可溶性糖、蔗糖和果糖含量,以及浸出液的电导率。结果表明,盐胁迫下萌发种子的α-淀粉酶活性降低,幼苗根冠比增加,但幼苗整体鲜重降低,叶片和根系浸出液电导率增大,总可溶性糖含量增加,叶片蔗糖和果糖含量增加,根系蔗糖含量降低。腐植酸浸种降低了α-淀粉酶活性,增加了叶片总可溶性糖和根系蔗糖含量,减少了根系总可溶性糖和叶片蔗糖含量,降低了叶片和根系浸出液电导率。推测腐植酸浸种可能是通过调控果糖浓度变化,缓解了盐胁迫下小麦幼苗的质膜损伤。 相似文献
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为探讨荔枝品种资源果实成熟期间的糖、酸变化特点,对15份荔枝品种资源果实成熟进程中假种皮的糖、酸含量变化及其完熟果的还原糖、蔗糖含量进行分析。结果表明,15份荔枝资源果实成熟进程中的糖的变化可分为还原糖积累型和蔗糖积累型2大类,其中还原糖积累型又可分为4个亚类;不同品种资源间,完熟果的还原糖、蔗糖含量差异显著,还原糖的含量在67.50~118.63 mg/g,蔗糖的含量在13.60~93.27 mg/g,大部分的荔枝资源其果实主要积累还原糖;荔枝果实假种皮的可滴定酸含量在成熟的前期急剧下降,后期变化趋缓;以完熟果的各糖分指标进行聚类分析可将15份荔枝资源分为2个类群5个组群。 相似文献
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Summary Field experiments with four potato cultivars showed that there were significant differences in susceptibility to attack by
wireworm,Agriotes obscurus. The two most susceptible cultivars had the lowest total glycoalkaloid (TGA) contents. Laboratory experiments with wireworms
feeding on tuber slices demonstrated that regions characterized by a low sugar and a high glycoalkaloid concentration were
avoided as feeding sites. Bio-assays with glycoalkaloids also showed that paper discs treated with a mixture of solanine and
chaconine were avoided by wireworms.
According to a forward stepwise regression analysis based on data from four cultivars and six regions of the tuber. TGA was
the key factor in predicting larval feeding, accounting for 65% of the total variation. Differences in reducing sugar levels
(fructose + glucose) explained an additional 13% of the variation. Differences in chlorogenic acid and sucrose levels added
very little to the accuracy of the prediction. 相似文献
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Patricia M. Duplessis Alejandro G. Marangoni Rickey Y. Yada 《American Journal of Potato Research》1996,73(10):483-494
The accumulation of reducing sugars in stored potato tubers is of significant commercial importance because of its effect on processing quality. The process by which the accumulation of sugars occurs involves the interaction of many metabolic pathways and is yet to be fully described. Low temperature conditions result in an accumulation of ATP in potato tissue. Published evidence suggests that low temperature activation of the alternative pathway (cyanide resistant respiration) leads to decreased ATP levels and simultaneous increases in sucrose concentrations. This sucrose becomes the substrate for vacuolar acid invertase resulting in the accumulation of reducing sugars. Inhibition of the alternative pathway results in decreased sugar accumulation thereby minimizing the sucrose available to the acid invertase and the subsequent reducing sugar accumulation. Control of the alternative pathway on its own, or in combination with acid invertase activity, may provide insight into the phenomenon of low temperature sweetening in stored potato tubers. 相似文献
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The target of this work was to develop a novel, industrially applicable process for simultaneously releasing different valuable components from wheat bran, including carbohydrates, oligomeric arabinoxylan and antioxidants. The process was based on alkaline pretreatment with potassium hydroxide (KOH) and subsequent enzymatic hydrolysis. Increasing KOH-dosage and thermal severity in pretreatment promoted carbohydrate solubilisation in hydrolysis, reaching glucose and arabinoxylan yields up to 86% and 76%, respectively. Release of antioxidants was particularly promoted by increasing KOH-dosage, while both the pretreatment severity and KOH-dosage promoted the release of oligomeric arabinoxylan in enzymatic hydrolysis. Two bran syrups, with or without KOH-treatment, were tested in bread making by substituting added sugar in the dough with bran syrup. The KOH-derived KCl also substituted 30% of NaCl in the bread formulation. The addition of bran syrup did not affect the baking properties of wheat bread dough. However, a decrease in bread flavour balance was observed with addition of syrup from KOH-pretreated bran. Conceptual level techno-economic assessment indicated that production of bran syrup would be economically feasible at a minimum selling price of 770 €/t and 1030 €/t with KOH-pretreatment and without KOH, respectively. 相似文献