一次喷射液化法生产麦芽糖浆

以碎米为原料,采用耐高温α-淀粉酶进行液化的一次喷射液化法生产麦芽糖浆。通过调浆、液化、糖化等工序的优化实验从而确定了最佳工艺条件。     

酶法小麦粗淀粉生产高麦芽糖浆工艺研究

高麦芽糖浆是淀粉糖的一个重要分枝,具有麦芽糖含量高,葡萄糖含量低,外观无色透明、甜度低、熬温高、吸湿性低、抗结晶性好等特点。可广泛应用于酿造、焙烤、软饮料、罐头和糖果工业中,作为水分调节剂、稳定剂、保持剂和食品填充剂。高麦芽糖浆应用于糖果,特别是硬糖果中可防止糖果发烊,提高产品的保质期。在冷饮中,如冰淇淋、冷冻甜点心加人高麦牙糖浆可防止在制作过程中冰晶形成和蔗糖结晶析出。我厂在有关科研院所的帮助下,经过多次试验,成功地实现了小麦粗淀粉生产高麦芽糖浆的规模化生产,为小麦粗淀粉开辟了一条有效的应用途…     

大米淀粉酶法液化工艺的研究

对大米淀粉的酶法液化工艺进行了研究,通过正交试验,得到大米淀粉液化工艺最佳条件为:大米淀粉浓度为20%,耐高温α-淀粉酶用量12 U/g淀粉,液化时间11 min,作用温度95℃,pH值为6.5.在此条件下,所得液化液的DE值为11.08%,糖化后麦芽糖含量为84.84%.     

麦芽糖酶法液化工艺

对大米淀粉的酶法液化工艺进行研究,通过正交试验,得到大米淀粉液化工艺最佳条件为:大米淀粉浓度为20%,耐高温α-淀粉酶用量30U/g,液化时间20min,作用温度95℃,pH值为6.5.在此条件下,所得液化液的DE值为14.18%.     

大米粉浆喷射液化试验

目前,我国工业生产中大多采用高温连续液化法或多段液化法,然而采用水蒸汽直接喷雾含酶淀粉乳的“喷射液化法”是一种比较好的液化方法,可使淀粉中蛋白类杂质凝固得较好,液化液过滤速度较快。本文通过实验对比证实,采用喷射液化法,可使液化液透明度增加,杂质絮凝块变大,过滤速度加快,并可减少α-淀粉酶的用量;液化蒸汽压力降低到2kg/cm~2,总糖收率高于升温液化法。     

双酶法生产高麦芽糖浆研究

首先研究了双酶的部分酶学性质。以玉米淀粉为原料，用耐高温α-淀粉酶水解至DE值为16．5％，再用真菌α-淀粉酶在最佳条件下作用21h，可得到含纯麦芽糖0．311g／mL的产品。该产品葡萄糖；量为0.017g／mL，糊精含量为2．7％，生产出优质高麦芽糖浆。     

二次通用旋转组合设计优化玉米高麦芽糖浆液化条件

以玉米淀粉为原料,采用耐高温α-淀粉酶为关键液化酶,以液化DE值和折光率为研究对象,考察底物浓度、加酶量、液化时间、液化温度、无水氯化钙用量以及pH值对液化DE值和折光率的影响,通过二次通用旋转组合设计,优化出玉米淀粉制备高麦芽糖浆的最佳液化条件。结果表明:在加酶量7.544μ/g、液化温度77.2℃、液化时间10.8min的条件下,玉米液化液DE值的理论预测值为6.76。     

淀粉喷射液化技术降低啤酒生产能耗

目前,淀粉以较高的浸出率和较低廉的价格等优势,逐步取代大米和玉米而成为啤酒生产的主要辅料,并深受国内各大啤酒集团的青睐。     

耐高温α-淀粉酶液化大米淀粉制取高麦芽糖浆的工艺研究

利用耐高温α-淀粉酶水解大米淀粉制取高麦芽糖浆,对液化过程中的影响因素进行了研究,研究发现液化液的DE值在11%时对制取高麦芽糖浆最有利,其工艺最佳条件为:每1 g淀粉耐高温α-淀粉酶用量为12 U,大米淀粉浆液的质量分数为20%,液化温度为95℃、pH值为6.5、液化时间10 min.     

浅谈连续喷射液化法在柠檬酸生产中的应用

我国柠檬酸工业长期以来主要采用薯干为原料,并利用间歇液化法直接进行柠檬酸发酵。但是,薯干原料存在着价高质次,影响柠檬酸的产酸水平,提取收率及设备的正常运行等问题同时薯于受到栽培期的限制,存在种植地区窄,收购季节短,贮藏损失大等缺点。加上与现在流行的连续喷射液化法相比,间歇液化法存在料液受热不均匀,蒸气消耗量大,蛋白质凝聚情况差,以致液化效果不好等不足。因此,目前许多厂家都改用玉米粉并应用连续喷射液化技术来生产柠檬酸。这样不仅降低了成本,而且缩短了发酵周期,提高了柠檬酸的收得率,经济效益显著。本人…     

高压对肉类基本成分的影响

高压处理能够在不破坏肉类风味和营养成分的前提下延长肉类制品的保藏期,同时,肉类经高压处理后其感官性状、组织结构都会发生明显的变化,而这些变化都与肉类的基本组成成分具有密切的关系。综述了压力处理对肉类基本成分的影响。     

Effect of high hydrostatic pressure (HHP) on structure and activity of phytoferritin

High hydrostatic pressure (HHP) has drawn considerable attention because of its potential application in food industry. Ferritin, an iron storage protein, is widely distributed in food made from legume seeds, which is highly stable due to its shell-like structure. Therefore, it is of special interest to know whether or not high HHP treatment has effect on this protein. In this study, the structure and activity of soybean seed ferritin (SSF) were examined by circular dichroism spectrum (CD), UV–VIS and fluorescence spectrophotometry in conjunction with stopped-flow light scattering upon treatment with HHP at 400 MPa for 10 min. Results revealed that such treatment has little effect on the primary and secondary structure of SSF, but pronouncedly altered its tertiary and quaternary structure. As a result, the protein aggregation property and iron release activity were dramatically changed, while its activity of iron oxidative deposition was kept unchanged.     

利用高温流化米酿制新型黄酒

我们将高温流化技术应用于黄酒生产的原料处理中，酿制了新型的高温流化米黄酒，并对高温流化米黄酒和蒸饭黄酒的成分进行了比较，发现高温流化米黄酒的各项成分与蒸饭黄酒的指标相近，但其中氨基氮较之蒸饭黄酒低得多，高温流化米黄酒还具有一种特殊的香味。     

Screening of rice cultivars for brewing high quality turbid rice wine

To screen proper rice cultivars for brewing high quality turbid rice wine, 5 high-yield rice cultivars, 9 high-eating-quality rice cultivars and 5 glutinous rice cultivars were collected. At the end of fermentation, significant differences (p < 0.05) were observed in the fermentation properties, sensory properties and suspension stability of the original fermented mash (OFM) among individual rice cultivars. The assayed fermentation properties of OFM included pH value, total acidity, amino acidity, reducing sugar, alcohol yield, fusel alcohols and ethyl acetate. Seven rice cultivars were screened out for producing high quality wine by the comparative analysis. This research provided the basic scientific data for producing potential high quality turbid rice wine.     

Isolation and characterization of protein fractions from deoiled rice bran

Rice bran contains underutilised protein materials. Sequential extraction of rice bran protein (RBP) from defatted rice bran was conducted based on the differences in their solubility. Three extraction methods were investigated. Method 1 involved the isoelectric and acetone precipitation using water, 50 g kg⁻¹ NaCl, 0.02 mol L⁻¹ NaOH and 70% ethanol as extracting solvents for albumin (pH 4.1), globulin (pH 4.3), glutelin (pH 4.8) and prolamin, respectively. Method 2 adopted dialysis and sequential extraction was carried out with 20 g kg⁻¹ NaCl, 70% ethanol, 0.1 mol L⁻¹ acetic acid and 0.1 mol L⁻¹ NaOH solution as extracting solvents. Method 3 combined dialysis, isoelectric and acetone precipitation for the extraction. Based on the yields and data obtained from sodium dodecyl sulphate polyacrylamide gel electrophoresis, size-exclusion chromatography and differential scanning calorimetry, method 3 was chosen for the isolation and characterization of RBPs. Rice bran protein fraction (RBPF)—albumin, globulin, glutelin and prolamin were obtained in good yields. Denaturation temperature and enthalpy values of denaturation of RBPF vary. Highest phytate content was found in albumin and lowest in prolamin. The highest antioxidative and hemagglutinating activities were observed in albumin.     

微射流均质处理对碎米淀粉性质影响的研究

采用高压微射流均质处理碎米制备低蛋白含量的大米淀粉产品,并对淀粉颗粒形貌学、大小、淀粉破损率以及热学性质进行观察与测定。研究表明:高压微射流均质压力达到100MPa,均质次数为2次的情况下,可以获得最低蛋白回收率与纯度的淀粉样品,分别为15.30%和1.29%。淀粉颗粒表面积平均粒径(d32)与体积平均粒径(d43)分别从19.70μm与121.04μm降低到9.30μm与65.13μm。破损淀粉的比例从46.72%显著提高到64.66%,且对大米淀粉的热性质影响并不显著。该处理能有效解聚大米淀粉-蛋白质复合体结构,制备出结构和性质更接近天然大米淀粉的产品,有利于其在食品工业中的应用。     

Functional properties of the Maillard reaction products of rice protein with sugar

The glycation of rice proteins with reducing sugars was investigated in an attempt to improve their solubility and functionality. Rice proteins isolated from a Chinese milled medium-grain rice were glycated with glucose, lactose, maltodextrin, or dextran in 2% aqueous dispersions. The sugar that provided the most improvement of the solubility, emulsification activity (EA) and emulsification stability (ES) of the Maillard reaction products was glucose. The optimum reaction conditions were at pH 11, 100 °C, and reaction time 15 min, which increased the solubility, EA and ES of rice protein from 20%, 0.46 and 11.1 to 92%, 0.64 and 18.2, respectively. Extending the reaction time beyond 15 min continued the development of latter-stage Maillard browning products without improvements in the functional properties of the Maillard reaction products. SEC–HPLC analysis with light scattering detection showed a decrease of the weight-averaged molecular weight from 500 to 100 K during the initial 15 min.     

高浓酿造法生产高辅料啤酒的研究

该文通过试验研究,确定了75%高辅料的糖化工艺、麦汁16°P高浓度的发酵工艺、高浓稀释工艺。采用上述工艺不仅生产的产品质量达到GB4927标准,而且感官指标和风味都比较稳定。从而提高了现有设备的利用率,增加了产量,降低了成本,提高了企业的经济效益。     

Physical and structural changes induced by high pressure on corn starch,rice flour and waxy rice flour

The impact of high pressure (HP) processing on corn starch, rice flour and waxy rice flour was investigated as a function of pressure level (400 MPa; 600 MPa), pressure holding time (5 min; 10 min), and temperature (20 °C; 40 °C). Samples were pre-conditioned (final moisture level: 40 g/100 g) before HP treatments. Both the HP treated and the untreated raw materials were evaluated for pasting properties and solvent retention capacity, and investigated by differential scanning calorimetry, X-ray diffractometry and environmental scanning electron microscopy. Different pasting behaviors and solvent retention capacities were evidenced according to the applied pressure. Corn starch presented a slower gelatinization trend when treated at 600 MPa. Corn starch and rice flour treated at 600 MPa showed a higher retention capacity of carbonate and lactic acid solvents, respectively. Differential scanning calorimetry and environmental scanning electron microscopy investigations highlighted that HP affected the starch structure of rice flour and corn starch. Few variations were evidenced in waxy rice flour. These results can assist in advancing the HP processing knowledge, as the possibility to successfully process raw samples in a very high sample-to-water concentration level was evidenced.Industrial relevanceThis work investigates the effect of high pressure as a potential technique to modify the processing characteristics of starchy materials without using high temperature. In this case the starches were processed in the powder form - and not as a slurry as in previously reported studies - showing the flexibility of the HP treatment. The relevance for industrial application is the possibility to change the structure of flour starches, and thus modifying the processability of the mentioned products.