羊栖菜提取物体外自由基清除能力的研究

通过不同溶剂对羊栖菜有效成分进行提取,并采用DPPH(二苯代苦味酰自由基)体系、羟基自由基体系、烷基自由基引发的亚油酸氧化体系、超氧阴离子自由基体系对各提取物的抗氧化性进行研究,并同VE、TBHQ(特丁基对苯二酚)、茶多酚进行了比较,结果得出羊栖菜粗提物只在DPPH体系和烷基自由基引发的亚油酸氧化体系中具有清除作用,其中以0 5%Na2CO3(W/V)为溶剂的提取物抗氧化能力最好,而以DPPH体系作为检测系统最为稳定,效果最佳     

Intraparticle diffusivity of Cd ions in a new biosorbent material

Cadmium equilibrium sorption isotherms were determined for formaldehyde crosslinked Sargassum fluitans, establishing that an effective regeneration of the new biosorbent material is possible by an acid wash. Batch desorption kinetics were investigated at pH values of 1·0 and 2·0. By incorporating the linear and non-linear Langmuir equilibrium isotherm relationships into the rate equations, a mathematical model was proposed for modeling the metal desorption process. The model was solved numerically and a MATLAB computer program was used to curve-fit the experimental data. The model successfully predicted the Cd²⁺ elution concentration profile in a batch reactor. The average values of the intraparticle diffusivity of Cd²⁺ in the algal biosorbent calculated from the model were 3·40 × 10⁻⁶ and 1·65 × 10⁻⁶ cm² s⁻¹, 0·473 and 0·229 times the molecular diffusivity of Cd²⁺ in water, at pH values of 1·0 and 2·0, respectively. These values agreed well with theoretical predictions.     

Exploring bioactive fraction of Sargassum wightii: In vitro elucidation of angiotensin-I-converting enzyme inhibition and antioxidant potential

Bioactive fraction of brown algae Sargassum wightii (SWE) was obtained using silica column chromatography and preparative Thin Layer Chromatography (TLC). FT-IR and LC–mass spectrometry ESI analysis revealed presence of various phlorotannins in the SWE. The IC₅₀ value of SWE was found to be 59.91, 51.04, and 55.21 μg/ml for scavenging of 2,2-diphenyl-1-picrylhydrazyl, 2,2-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid), and Ferric Reducing Antioxidant Power assay, respectively. SWE inhibited angiotensin-I-converting enzyme (ACE) in mixed-type manner with IC₅₀ value of 56.96 µg/ml and Ki value of 45 µg/ml. The dual function such as antioxidant and ACE inhibition of SWE warrants further study to understand the antihypertensive potential in vivo.     

羊栖菜干燥技术及其即食汤料包的研究

以羊栖菜为原料,通过对羊栖菜干制技术及调味配方的研究,制成一种方便营养的鸡肉味即食羊栖菜调味包。实验结果表明,干燥羊栖菜的最佳工艺为:在95℃下漂烫90s后热风干燥70℃下3.5小时,脱水羊栖菜的复水形态、色泽等质量较好。最佳菜包配方为脱水红胡萝卜1.5g、脱水羊栖菜6g、脱水香葱0.6g;最佳调味粉配方为:4.5g、I+G0.03g、味精0.5g、大蒜粉0.125 g、生姜粉0.1 g、葱粉0.15 g、白胡椒粉0.1 g;最佳鸡汤味酱包为:棕榈油在3.5 g、食盐1.0 g、酱油1.6 g、鸡骨油1.5 g。     

羊栖菜褐藻糖胶的分级纯化和结构分析

从浙江洞头产羊栖菜中提取得到的褐藻糖胶,经DEAESepharoseCL 6B柱层析得F1、F2和F33个组分,F3又经SepharoseCL 6B柱层析得F31、F32和F333个级分.经凝胶过滤色谱检测,F31、F32和F33为均一组分.化学组成分析表明,这5个级分均为岩藻糖、半乳糖和甘露糖等糖基组成的杂多糖,并含有硫酸酯、糖醛酸以及少量的蛋白质,相对分子质量范围为2.5×104～9.5×105.F33中氮的质量分数为2%,氨基酸分析和紫外扫描表明氮大部分可能来自核酸.F32的硫酸酯对碱基本稳定,表明大部分硫酸酯位于单糖残基的垂直位置.     

Optimization of spray drying process of Sargassum muticum color extract

ABSTRACT

Sargassum muticum is categorized as a brown seaweed species which has been used as a dye fabric colorant in certain regions of Asia. The brown extracts of S. muticum also have antioxidant properties, which could enhance the color and nutrients in food products. However, the color extract is unstable, and also limits the application. This study was performed to encapsulate the color extract with maltodextrin and stabilize the color extract by spray drying technique using combinations of various levels of inlet temperature and feed flow rate. Initially, S. muticum powder was analyzed for moisture content, water activity, solubility, and color properties for optimization purposes. This study showed that the optimum inlet temperature and feed flow rate of the spray drying process to produce good-quality, stable, and acceptable powder properties were at 140°C and 3?rpm, respectively, with 4% of maltodextrin. Then, the powder was analyzed for density, compressibility index, hygroscopicity, particle size, and antioxidant properties. This study represents an interesting food additive to be incorporated in functional food due to the attractive brown colorant and the presence of antioxidants.     

东海药用海藻化学成份分析研究──（Ⅰ）羊栖菜中微量元素分析

本文对盛产于浙江沿海地区的药用海藻—马尾藻科羊栖菜（Ｓａｒｇａｓｓｕｍｆｕｓｉｆｏｒｍｅ（Ｈａｒｖ．）ｓｅｒｃｈｅｌｌ）中的微量元素通过发射光谱法进行了半定量分析测定，结果表明该植物中富含人体所需的各种微量元素，具有较高的开发利用价值．     

羊栖菜褐藻糖胶的分离纯化和组成性质研究

对羊栖菜褐藻糖胶的7种组分进行了分离纯化和性质研究。首先以羊栖菜为原料,通过CaCl2法和酸法抽提褐藻糖胶,然后经DEAE-Cellulose52离子交换柱层析和SephadexG-100凝胶柱层析,分离得到了7个组分,经纸层析和紫外扫描证实均为单一组分。其次对7个组分的性质进行了研究,经GPC凝胶排阻色谱、气相色谱和红外光谱对各组分的相对分子质量、单糖组成、结构性质等进行了测定;经HIO4氧化法和比浊法对各组分的岩藻糖和硫酸根含量进行了测定;最后通过MTT法,研究了各组分对DU-145和SPC-A1细胞的作用,结果表明各组分对该二种癌细胞的增殖均有抑制作用。     

羊栖菜高活性膳食纤维提取工艺的研究

采用酶处理及化学的方法研究了酶解、消化、漂白和活化等工艺条件对提取羊栖菜膳食纤维的影响,筛选出提取膳食纤维的最佳工艺条件。试验结果表明,在该工艺条件下,羊栖菜膳食纤维的产率为26.7%,颜色为类白色,膳食纤维含量为66.22%,钙含量7.72%,膨胀力152mL/g,持水力3490%。     

羊栖菜多酚提取工艺优化

目的对羊栖菜多酚提取工艺进行优化研究。方法通过乙醇溶剂提取羊栖菜中多酚,探讨乙醇浓度、提取时间、料液比以及提取温度等因素对羊栖菜多酚提取的影响,在单因素的基础上,选取乙醇浓度、提取时间和液料比为影响因子,应用Box-Benhnken中心组和设计原理进行3因素3水平实验设计,以羊栖菜多酚的提取量为响应值,运用响应面(response surface methodology,RSM)法对羊栖菜多酚提取工艺进行优化。结果回归模型具有高度显著性,方程对试验拟合较好,可以对羊栖菜多酚提取量进行很好的分析和预测;各因子对提取量的影响大小依次是乙醇浓度料液比提取时间,羊栖菜多酚最佳提取条件为乙醇浓度25%、提取时间3 h、液料比30:1(V:m)、提取温度40℃。结论在此条件下羊栖菜多酚的提取率达7.91 mg/g,与预测值8.02 mg/g基本一致。