HACCP在低聚半乳糖生产中的应用研究

HACCP(危害分析与关键控制点)是食品工业中预防各类危害,确保食品卫生质量及安全性的一种先进的管理方法。随着近几年低聚半乳糖的发展,低聚半乳糖以其独特的功能优势越来越受到了市场的喜爱。在低聚半乳糖实际生产中适时引入HACCP原理进行管理尤为重要。对HACCP在酶法转化法生产低聚半乳糖生产中的应用进行了研究。     

低聚木糖功效及其在健康食品中的应用概述

在中国食品配料蓬勃发展的高速增长期,各类食品配料如雨后春笋破土而出。据相关统计数据显示,目前各类食品配料多达上万种,从普通的添加剂到功能性营养补充剂应有尽有。对于食品配料的认识也不尽相同,但毋庸置疑食品配料已经与人们生活息息相关。文章着重叙述了功能糖领域的超强双歧因子低聚木糖。市场上含有功能糖的终端食品有很多,这些功能性食品备受消费者青睐,例如大家耳熟能详的脑白金、山东龙力生物研发的低聚木糖豆奶粉、低聚木糖醋等的市场前景看好。     

新刊导读

食品添加剂功能性食品添加剂在保健食品中的应用和发展趋势/凌关庭//中国食品用化学品.-1999,(4).-9～14 本文分类按系统地介绍了目前国内外功能性食品添加剂的功能、应用情况及发展趋势。功能性低聚糖/尤新//中国食品用化学品.-1999,(3).-1～5 本文介绍了功能性低聚糖的生理活性,日本市场概况,特别报道了低聚异麦芽糖、低聚龙胆糖、低聚果糖的特性、组成和用途。新型防霉剂双乙酸钠/章朝晖//化工时刊.-1999,13(6) -6～10     

大豆低聚肽的开发与应用

用大豆蛋白粉或大豆分离蛋白为原料,经蛋白水解酶水解制得大豆低聚肽。所制的大豆低聚肽在pH 2-8的范围内几乎是完全溶于水的。它们具有较高的抗氧化活性,显著的促进发酵作用,同时亦是非常有效的ACE抑制剂。大豆低聚肽在保健食品、婴幼儿食品和运动食品等方面有广泛的应用,具有良好的社会和经济效益。     

低聚木糖在食品工业中的应用及发展前景

介绍了低聚木糖在饮料、保健食品、焙烤食品中的应用,概述了低聚木糖的发展前景.     

低聚果糖在特殊医学用途食品中的应用

低聚果糖(scFOS)是一种理想的益生元和膳食纤维,具有高度溶解性且黏度较低,能很好契合特殊医用食品需要通过管道进食的要求,可以调节肠道功能,维持大肠完整性,可以抵抗肠道有害微生物的定植,预防结肠癌等特性,动物及很多人体体外实验都证实了进食scFOS的生理学功效。本文介绍了低聚果糖在特殊医学用途食品中的广泛应用,如调节肠道功能,维护大肠完整性,预防结肠癌等。     

低聚异麦芽糖发展中的问题及当前对策

本文针对低聚异麦芽糖发展中存在的问题,阐述了如何研究应用低聚异麦芽糖生理功能,开发功能食品,拓展销售市场,以及如何在改进工艺、完善配套设备基础上提高产品质量。     

低聚异麦芽糖发展中的问题及当前对策

本文针对低聚异麦芽糖发展中存在的,阐述了如何研究应用低聚异麦芽糖生理功能,开发功能食品,拓展销售市场,以及如何在改进工艺,完善配套设备基础上提出产品质量。     

低聚壳聚糖的制备与应用研究

壳聚糖经过降解后达到较小分子量（Mw1000—100000）范围的低聚壳聚糖因具有特殊的生物活性和功能性质而日益受到研究者们的重视与关注。本文概要综述了国内外低聚壳聚糖的研究进展，包括低聚壳聚糖的制备方法，如酶降解法、酸水解法、氧化降解法、物理法等，以及低聚壳聚糖在医药、抗菌、化妆品、农业、食品等方面的应用。     

果胶含量的测定

<正> 果胶是一种以半乳糖醛酸为主的复合多糖类物质,它也是一种植物胶,可作为食品的增稠剂和凝冻剂,并对桔汁生产中的混浊体起稳定剂作用,在医药上也可作为治疗胃肠道及胃溃疡疾病的良好药剂。选择适宜条件,对果胶样品中半乳糖醛酸含量进行快速、准确测定,这对果胶的大量生产及应用都具有重要的意义。本实验所用的果胶样品是以黄岩蜜桔的     

Preparation and characterization of multilayer Gd2O2S:Tb phosphor screen for X-ray detection application

Gd2O2S:Tb (GOS) phosphor screen, generally with a multilayer structure, has been widely used in digital X-ray imaging. GOS phosphor screen is fabricated via a slip casting route, which is an effective method to obtain multilayer composites with good strength. The GOS slurry was prepared using the menhaden oil, polyvinyl butyral and PEG-400 as dispersant, binder and plasticizer, respectively, and slip casted on a support layer. After the GOS scintillation layer is formed, a transparent polyethylene terephthalate film is covered on it as a protective layer. The X-ray excited emission spectra of the obtained GOS phosphor screen is well match to the spectral response of a-Si:H photodiode, and the spatial resolution was close to 3.7 LP/mm, which could meet the request of the commercial application.     

Graphene oxide-based SPR biosensor chip for immunoassay applications

This work develops a highly sensitive immunoassay sensor for use in graphene oxide sheet (GOS)-based surface plasmon resonance (SPR) chips. This sensing film, which is formed by chemically modifying a GOS surface, has covalent bonds that strongly interact with the bovine serum albumin (BSA), explaining why it has a higher sensitivity. This GOS film-based SPR chip has a BSA concentration detection limit that is 100 times higher than that of the conventional Au-film-based sensor. The affinity constants (K_A) on the GOS film-based SPR chip and the conventional SPR chip for 100 μg/ml BSA are 80.82 × 10⁶ M^-1 and 15.67 × 10⁶ M^-1, respectively. Therefore, the affinity constant of the GOS film-based SPR chip is 5.2 times higher than that of the conventional chip. With respect to the protein-protein interaction, the SPR sensor capability to detect angle changes at a low concentration anti-BSA of 75.75 nM on the GOS film-based SPR chip and the conventional SPR chip is 36.1867 and 26.1759 mdeg, respectively. At a high concentration, anti-BSA of 378.78 nM on the GOS film-based SPR chip and the conventional SPR chip reveals two times increases in the SPR angle shift. Above results demonstrate that the GOS film is promising for highly sensitive clinical diagnostic applications.     

Potential health benefits of conjugated trienoic acids

Current studies on physiological functions of certain plant seed oils containing conjugated trienoic acids as a major fatty acid component are indicative of the possible usefulness of these oils as a new type of functional oils. Here, we describe the potential health benefits of conjugated trienoic acids.     

Thermal,dynamic‐mechanical,and dielectric properties of surfactant intercalated graphite oxide filled maleated polypropylene nanocomposites

Graphite oxide (GO) and amine surfactant intercalated graphite oxide (GOS) filled maleated polypropylene (PPgMA) nanocomposites were prepared directly by solution blending. In this study, the effects of the surfactant intercalation on the crystalline structure, thermo‐mechanical, and dielectric properties of PPgMA/GO and GOS composites are reported. Wide‐angle X‐ray diffraction exhibited a lower intensity diffraction peak of the monoclinic (α) phase of PPgMA for PPgMA/GOS composites compared with the unfilled sample. Differential scanning calorimetry exhibited a single characteristic melting peak of monoclinic (α) crystalline phase. The incorporation of GOS hardly showed any change in T_m. However, the significant decrease in the melting enthalpy of PPgMA/GOS composite, which was lower than that of GO filled PPgMA, demonstrated the high degree of dispersion of the GOS flakes in the PPgMA matrix. Dynamical mechanical analysis indicated that incorporation of GO or GOS into PPgMA increased both the storage modulus and the glass transition temperature, due to the hydrogen bonding between GO and the maleic anhydride group of PPgMA. Dielectric analyzer showed significant increase in both dielectric permittivity and dielectric loss at high temperature regimes in the GOS nanocomposites. The finely dispersed GOS in the PPgMA matrix manifested the interfacial polarization, which gave rise to much greater ε′ and ε″ than that of PPgMA/GO hybrid. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

纳米二氧化硅/氧化石墨烯复合物对普通硅酸盐水泥力学性能的影响

氧化石墨烯(GO)在水泥中的分散性较差,限制了其提高水泥基复合材料性能。采用溶胶-凝胶法制备了纳米二氧化硅/氧化石墨烯复合物(GOS),在模拟的水泥孔隙溶液中对比了GO和GOS的分散稳定性;同时,制备了添加纳米片的水泥浆体,研究了GO和GOS对其力学性能的影响。结果表明:GOS在水泥环境中的分散稳定性明显优于GO;与对照组相比,GO/水泥基复合材料的28 d抗折和抗压强度分别提高了20.48%和13.14%,而GOS/水泥基复合材料分别提高了35.42%和23.90%。微观分析表明,GO/水泥基复合材料内部形成花状水化晶体,GOS/水泥基复合材料内部的水化晶体彼此交联,结构致密,降低了水泥脆性,提高了韧性。     

功能性甜味剂—低聚糖的研究进展

着重介绍了功能性低了聚糖的主要种类、结构、生理功能、生产方法等,并对其发展前景进行展望。     

Beneficial Effects of Soybean-Derived Bioactive Peptides

Peptides present in foods are involved in nutritional functions by supplying amino acids; sensory functions related to taste or solubility, emulsification, etc.; and bioregulatory functions in various physiological activities. In particular, peptides have a wide range of physiological functions, including as anticancer agents and in lowering blood pressure and serum cholesterol levels, enhancing immunity, and promoting calcium absorption. Soy protein can be partially hydrolyzed enzymatically to physiologically active soy (or soybean) peptides (SPs), which not only exert physiological functions but also help amino acid absorption in the body and reduce bitterness by hydrolyzing hydrophobic amino acids from the C- or N-terminus of soy proteins. They also possess significant gel-forming, emulsifying, and foaming abilities. SPs are expected to be able to prevent and treat atherosclerosis by inhibiting the reabsorption of bile acids in the digestive system, thereby reducing blood cholesterol, low-density lipoprotein, and fat levels. In addition, soy contains blood pressure-lowering peptides that inhibit angiotensin-I converting enzyme activity and antithrombotic peptides that inhibit platelet aggregation, as well as anticancer, antioxidative, antimicrobial, immunoregulatory, opiate-like, hypocholesterolemic, and antihypertensive activities. In animal models, neuroprotective and cognitive capacity as well as cardiovascular activity have been reported. SPs also inhibit chronic kidney disease and tumor cell growth by regulating the expression of genes associated with apoptosis, inflammation, cell cycle arrest, invasion, and metastasis. Recently, various functions of soybeans, including their physiologically active functions, have been applied to health-oriented foods, functional foods, pharmaceuticals, and cosmetics. This review introduces some current results on the role of bioactive peptides found in soybeans related to health functions.     

Application of tris(hydroxymethyl)phosphine as a coupling agent for β‐galactosidase immobilized on chitosan to produce galactooligosaccharides

β‐Galactosidase was immobilized on chitosan using tris(hydroxymethyl)phosphine (THP) as a coupling agent to produce galactooligosaccharides (GOS) from lactose. Both the THP‐immobilized and the free enzymes were maximally achieved at pH 5.0 and the optimal temperature was 55 °C. The residual activities for the THP‐immobilized enzyme and the free enzyme were 75 and 25%, respectively, after being incubated in 0.1 mol dm^?3 sodium acetate buffer (pH 5.0) at 55 °C for 13 days. The formation of GOS was catalyzed by free and THP‐immobilized β‐galactosidase from lactose. The yield of GOS produced by the free enzyme from the lactose solution (36%, w/v) at 55 °C was 43% on a dry weight basis, which was similar to the 41% GOS yield produced by the THP‐immobilized enzyme system. Copyright © 2005 Society of Chemical Industry     

Potential of Integrated Semi-Continuous Enzymatic Synthesis and Filtration Processes for Efficiency Enhancement

Galacto-oligosaccharides (GOS), increasingly popular prebiotics, are synthesized by enzymatic conversion of lactose. Among others, the total production costs are significantly influenced by the costly enzyme. Therefore, it was investigated if the reuse and full recovery of the enzyme is feasible, followed by the development of a semi-continuous process in order to maintain a consistent high GOS yield. As a preliminary step, the enzyme-catalyzed reaction was recorded within the permissible operating parameters. It was successfully shown that steady high GOS yields can be synthesized semi-continuously within a filtration plant functioning as an enzymatic membrane reactor.