Abstract:菊糖与十八烷基异氰酸酯在有机溶剂中发生甲氨酰化反应,生成的氨甲基菊糖具有表面活性。氨甲基菊糖能明显降低界面张力且在电解质介质中有较高的浊点。实验表明,当NaCl浓度达到4mol/L、MgSO4浓度达到1mol/L,温度升至100℃时溶液仍然未混浊。聚乙二醇(PEG)系列表面活性剂在电解质溶液中没有这么高的浊点,从而显示了氨甲基菊糖作为表面活性剂的优越性。通过储藏实验,发现以改性菊糖为表面活性剂的乳液性能稳定。

Abstract:研究了热风干燥（AD）菜心复水时间、碱性复水液及护色剂对蔬菜纸的影响,并优化了蔬菜纸的护色工艺。实验结果表明,在复水时间为6-10min时蔬菜纸色泽较好,复水时间越长,蔬菜纸的维生素C（VC）质量分数越低。在pH=7-8的条件下复水时,蔬菜纸色泽较好但VC质量分数较低。乙酸锌溶液对蔬菜纸的护色效果最好,对蔬菜纸的VC质量分数影响不大。

Abstract:基于梨果实非损伤条件下的跌落冲击动力学特征,采用非线性黏弹性本构模型表征其流变特性。依据跌落冲击未损伤时的试验结果,进行模型参数识别。结果表明理论模型与试验结果十分吻合。采用本模型结合试验结果能较准确方便地确定果实跌落冲击的流变特征参数。研究结果为果实黏弹性流变特性分析以及模型表征提供了一种新方法。

Abstract:研究了亲脂性表面活性剂的性质和用量对W/O/W型复合乳状液稳定性的影响,采用两种类型的亲脂性表面活性剂：新型的聚合型高分子表面活性剂聚氧乙烯（30）二聚羟基硬脂酸脂（Arlacel P135）和传统的小分子表面活性剂Span80和Tween80的混合物（质量比9∶1,HLB=5.4）制备复乳。采用离心保留率、光学显微镜和黏度等方法评价初乳和复乳的稳定性。结果表明,与小分子表面活性剂Span80和Tween80的混合物相比,大分子聚合表面活性剂Arlacel P135可以显著地提高复合乳状液的稳定性,在优化的条件下复乳的稳定性可以达到2000r/min离心15min不分层。

Abstract:作者研究了从红薯中提取黄酮类活性物质的最佳方法以及该提取物的抗氧化性。设计四因素三水平的正交试验,用水浴法和超声法对红薯中黄酮类物质的提取方法进行了研究,选取最佳条件。通过DPPH体系法,氮蓝四唑(NBT)光化合还原法和抗坏血酸Cu2+-H2O2体系法,分别研究最佳条件下薯皮薯肉提取物的抗氧化性。结果表明:水浴法以固液质量体积比1g∶15mL,体积分数70%乙醇水溶液在65℃浸提1h为最佳;超声法以固液质量体积比1g∶15mL,体积分数70%乙醇水溶液超声35min浸提为最佳。在提取方法中,超声法优于水浴法,其黄酮得率分别为2.80mg/g和2.14mg/g;抗氧化性实验表明,薯肉中提取的黄酮类活性物质对DPPH、O2-·、·OH的清除率分别可达80.34%、66.23%、53.32%,薯皮中提取的黄酮类活性物质的清除率分别可达86.81%、84.59%、75.06%。

Abstract:The crude solution containing extracellular polysaccharide was obtained by centrifugation and ultrafiltration from the Dunaliella salina culture, followed by the ethanol precipitation, washing with acetone and anhydrous ether and freeze drying. After the

Abstract:用红外光谱法对羟丙基-β-环糊精的结构进行了定性分析,用气相色谱-质谱联用方法,通过对质谱图解析,详细研究了羟丙基-β-环糊精中羟丙基的分布。此羟丙基-β-环糊精以C2位取代为主,计算得到其平均取代度为6.41。

Abstract:In this study, the milk components SCC,NAGase, peroxidase, catalase, lipase, and FFA were analysed and compared 434 milk samples from 30 Holstein cows. The results showed that the SCC in summer were higher than that in winner and the SCC was highest in Se

Abstract:In this manuscript, the flavonoid of Moringa oleifera leaves was extracted with ethanol refluxing method, then the crude total flavonoid was chormatographed by AB-8 microporous absorbent resins to obtain the total flavones of Moringa oleifera leaf (TFM),

Abstract:The fruits of Berberis heteropoda Schrenk were used as experimental material to extract the red pigment. The harmful trace elements in this pigment were tested. And the edible safety was studied by the methods of toxicology. The results indicated that the

Abstract:In lab-scale, with anaerobic floccules sludge as sludge source, sluphate-reducing bacteria granular sludge was cultivated. The operation conditions of SRB granular sludge form were studied. The results indicated that inflow sulfate concentration, carbon s

Abstract:In this study, with quinine bisulphate as a reference, fluorescence efficiency for seven alcohol materials were determined. It is found that all of them are weak fluorescence materials. In order to get the best fluorescence efficiency from the mixture of

Abstract:对粗状假丝酵母产生脂肪酶的培养条件进行了研究。结果表明,该菌株产脂肪酶的适宜培养基组成为:桐油15mL/L,黄豆粉30g/L,糊精10g/L,硝酸铵10g/L,MgSO4·7H2O1g/L,K2HPO42g/L,Tween800.5g/L;最佳培养为温度30℃、发酵液起始pH6,摇瓶发酵脂肪酶活力达到1467U/mL。

Abstract:以荷S180实体瘤的昆明小鼠为模型,研究了总状蕨藻粗多糖(CRP)的抗瘤作用及其对免疫器官等的影响,采用细胞培养法研究了CRP及其两个主要级分(CRPF1和CRPF2)对正常小鼠免疫细胞功能的影响。实验结果显示:总状蕨藻粗多糖对S180实体瘤具有显著的抑制作用,其抑瘤率和免疫活性与给药方式、剂量等因素有关,在注射和灌胃给药条件下,当CRP剂量分别为25mg/(kg.d)和100mg/(kg.d)时,其抑瘤率达到最大值,分别为46.2%和58.2%,且在注射给药时能显著地增加小鼠的脾脏指数。在50~200mg/(kg.d)范围内,灌胃给药时能升高小鼠碳廓清指数;细胞培养结果显示:CRP能提高正常小鼠的免疫功能,不过,其对静止淋巴细胞增殖的促进作用和对小鼠腹腔巨噬细胞MФ分泌NO的促进作用均小于CRPF1和CRPF2。以上事实表明,总状蕨藻多糖具有较强的抗肿瘤和增强小鼠免疫力的作用。

Abstract:利用序批式呼吸运动计量法研究了硝化颗粒污泥硝化作用的基质抑制及其动力学模型。实验结果表明：随着基质质量浓度的逐渐升高,亚硝化速率和硝化速率都呈先增后降的趋势,然而即使在较高的基质质量浓度下,硝化颗粒污泥仍具有较强的基质降解能力;硝化颗粒污泥亚硝化作用和硝化作用的基质抑制都可用Haldane模型较好地进行描述,其相关系数分别为0.96和0.98。

Abstract:In this study, the white rot fungi was used to deal fermentation production protein feed stuff with herb-medicine residues as substrate by solid-state fermentation. The optimum fermentation conditions were obtained based on. It was found that the protein

Abstract:This paper used three methods to extract invertase from yeast, which included in this manuscript, three different extraction method breaking cells by adding methylbenzene, frost grinding, and adding SDS for extracting invertase from yeast were investigate

Abstract:研究了培养基组分和培养条件对黑曲霉菌株Aspergillusniger LW-1固态发酵产β-甘露聚糖酶的影响。在单因素试验的基础上,采用Plackett-Burman和Box-Behnken实验设计确定的最佳产酶培养基组成和培养条件：麸皮与豆饼粉质量比为7.5∶2.5（g/g）,其它物质相对于固体物料的质量分数分别为魔芋粉4%,KH2PO40.3%,玉米浆5%,CaCl20.1%,MgSO40.1%,（NH4）2SO41%,液固质量比为1.5∶1,自然pH;32℃静置培养84h,期间翻曲1次。最高酶活可达24879IU/g。

Abstract:研究了低色素出芽短梗霉菌株G-58发酵液的后处理工艺。发酵液热处理后,用活性炭脱色,活性炭适宜添加量是0.6%,多糖得率94.5%,脱色率为34.8%;乙醇为沉淀剂,用量为发酵液体积3倍;多糖沉淀再用体积分数75%乙醇洗涤3次脱盐,多糖得率90.6%,多糖纯度96.8%;60℃热风干燥;产品白色、易溶,相对分子质量较大;最终多糖得率是85.6%。

Abstract:以D311离子交换树脂为载体,通过离子交换吸附法对Lipolase100L脂肪酶进行了固定化。采用考马斯亮蓝法测定了酶蛋白在离子交换树脂上的吸附率,考察并得到了酶固定化的最佳条件：在pH10缓冲液下,加酶液量为每克预处理过的树脂加入1.5mL,吸附时间为10h,吸附温度为35℃。所得固定化酶用于催化合成月桂酸月桂醇酯,在反应物质的量比为1∶1时,水质量分数为8%,在50mL异辛烷有机溶剂中固定化酶用量为200mg,反应时间为210min,温度为55℃的最佳条件下,酯化率可达91.3%。

Abstract:利用现有的超临界流体萃取实验装置,以CO2为萃取剂,考察了萃取压力、温度、CO2流量及原料颗粒大小等因素对枸杞籽油萃取率的影响,并由此确定了较佳的萃取工艺条件：萃取压力25-30MPa,操作温度318-323K,枸杞籽颗粒度40-50目,CO2流量0.3-0.4m^3/h,此时枸杞籽油萃取率最高,可达15.5%。并基于萃取器微分单元和固态原料颗粒微分单元质量守恒原理,建立了微分方程,利用直线推动力近似理论拟合总传质推动力及平衡吸收常数,化简方程,对实验结果进行了数值模拟,优化了实验条件。

Abstract:The present study was to investigate antitumor effects of Extract from Cruciferous Vegetables 6320 (isothiocyanate, basically). In vitro, MTT assay, cell morphological changes, cell growth curve were used to observe the inhibitory effects of Extract 6320

Abstract:In this paper, the conception and the structure of the electronic tongue together with recent achievements on its construction were reviewed. The electronic tougue mainly comprised three different parts. The first is the sensors array which was composed o

Abstract:Immunoassay is an important method in modern life science, and can be qualitative and quantitative analysis. The principle of immunoassay is the specific reaction between antibody and antigen, which has high sensitivity, high specificity, and convenient.

Abstract:益生菌的生存能力和稳定性是生产者在技术和市场方面临的两大挑战。由于芽孢对多种不利环境有极大的抗性而成为近年来益生菌剂中一个研究热点。芽孢的抗性与多种因素有关,并通过芽孢这种独特结构来实现。Spo0A和σ是芽孢形成过程中基因表达的关键调节因子。杆菌和梭菌在芽孢形成中的主要差别是梭菌形成感受态细胞和淀粉粒的积累。为了得到最高的菌体浓度和芽孢形成率,需要优化培养条件。其中,遗传性、接种量、培养温度、pH值、无机盐、淀粉、菌体浓度、营养因子的限量添加都与芽孢的形成有重要关系。