一种快速测定多聚羟基烷酸分子量的方法

以氯仿作溶剂，用黏度法测定了多聚羟基烷酸的分子量．摸索了检测的最佳温度与溶液浓度．比较了黏度外推法与黏度单点法测验结果，建立了黏度法测定多聚羟基烷酸平均分子量的操作方法。该法具有溶剂毒性小、溶解性好、准确度高和操作简便等优点．适用于生产过程和成品检验中的多聚羟基烷酸分子量的测定。     

多聚羟基烷酸的发酵生产研究进展

多聚羟基烷酸（PHA）是一类有良好应用前景的生物可降解塑料，为降低其生产成本，国内外科研工作者进行了大量的研究，本文着重对PHA的发酵生产和提取工艺进行了介绍。     

聚β–羟基烷酸酯的改性研究进展

介绍了聚β-羟基烷酸酯的性能。综述了近年来针对PHA的缺点进行改性的方法:生物合成改性;与生物活性无机材料的复合改性及表面改性。展望了改性后的PHA在组织工程及医用材料中的应用。     

聚β-羟基烷酸酯的改性研究进展

介绍了聚β-羟基烷酸酯的性能.综述了近年来针对PHA的缺点进行改性的方法:生物合成改性;与生物活性无机材料的复合改性及表面改性.展望了改性后的PHA在组织工程及医用材料中的应用.     

新型环境友好型热塑材料聚羟基烷酸的研究进展

在对聚羟基烷酸（PHAs）的结构和性质介绍的基础上，从实际工业应用的角度综述了国内外近年有关它的生物合成、提取及应用中取得的成果与存在的问题，展望了这一新材料的发展趋势与应用前景。     

萃取工艺条件对多聚羟基烷酸中内毒素含量的影响

研究了氯仿萃取条件对新型生物材料多聚羟基烷酸（PHAs）发酵产品中内毒紊含量的影响。通过正交试验优化萃取条件，建立了一种能降低产品中内毒紊含量的萃取工艺。结果表明：将干细胞加入50倍体积氯仿中，在30℃的条件下，120min反复氯仿溶解乙醇沉淀4次，以离心的方式进行固液分离，得到PHAs产品的内毒素含量显著降低。     

芥酸甲酯氧化制备十三烷二酸

提出了一条芥酸甲酯氧化制备十三烷二酸的新工艺路线:以过氧化氢和氧气为氧化剂,芥酸甲酯经烯键环氧化、环氧水解、邻二醇氧化裂解等反应制备十三烷二酸。着重研究了烯键环氧化和环氧水解反应中,影响烯键环氧化反应收率和中间产物羟基值的条件参数。结果表明:含邻二醇的中间产物的羟基值越高,十三烷二酸的总体收率越高;采用新工艺路线,十三烷二酸的总收率达到70.3%,具有工业化应用前景。     

含纳米碳材料的聚羟基烷酸酯可降解复合材料及制备方法

本发明涉及一种含纳米碳材料的聚羟基烷酸酯可降解复合材料及其制备方法,该复合材料为在聚羟基烷酸酯基体中引入高热导纳米碳材料,在所得复合材料中构成高效导热网络,促进结晶放热的消散;纳米碳材料同时作为成核剂,促进聚羟基烷酸酯基体形核结晶;纳米碳材料还作为增韧剂对所得复合材料强韧化;所述的聚羟基烷酸酯基体与纳米碳材料的质量比为10∶1～2000∶1。与现有技术相比,本发明具有加工性能、力学性能、热学性能高,生产成本低等优点。     

生物降解塑料的研究进展——淀粉基塑料、聚乳酸塑料、聚羟基烷酸酯塑料

文章介绍了淀粉基塑料、聚乳酸塑料、聚羟基烷酸酯塑料三类可生物降解材料的特点、应用及研究进展。     

利用有机废水生产聚羟基烷酸(PHAs)的进展

聚羟基烷酸（PHAs,polyhydroxyalkanoates）是由微生物经β-羟基烷酸聚合而成的一类高分子化合物的总称,它具有优良的生物可溶性、生物可降解性、光学活性、压电性等品质。本文综述了近年来利用有机废水生产PHAs的研究进展。     

Copolymers of polyhydroxyalkanoates and polyethylene glycols: recent advancements with biological and medical significance

Copolymers of polyhydroxyalkanoates (PHAs ) and polyethylene glycols (PEGs ) have gained high significance for biological and medical applications within the past few years. PHAs are natural biopolymers (hydrophobic biopolyesters), which can be produced microbially and also synthetically, and PEGs are biocompatible hydrophilic polyethers, which are frequently used in medicine to enhance the effect of bioactive compounds. Both polymers can be conjugated with a variety of other polymers, and in particular the conjugation with each other affords hydrophobic ? hydrophilic PHA‐PEG copolymers with high significance as biomaterials. This paper describes selected recent developments in this field with a focus on synthetic approaches and the suitability of the resulting copolymers for applications in drug delivery and tissue engineering. © 2016 Society of Chemical Industry     

活性污泥合成PHAs单体组分的调控方法

聚羟基烷酸酯（PHAs）是一类生物合成的环境友好高分子塑料，具有广泛应用前景。活性污泥合成PHAs可降低PHAs生产成本，实现废物资源化。PHAs的物化性质取决于其单体组分的结构和含量。基于优化PHAs产量的工艺研究，总结了调控活性污泥合成的聚羟基丁酸 羟基戊酸（PHBV）中羟基戊酰含量的工艺措施和生化原理。已有研究表明，好氧时，碳源类型决定PHBV中的单体组分;一般地，溶解氧浓度（DO）降低，PHBV中HV含量会增加;污泥来源、pH值以及碳源与氮磷浓度比的变化都会影响HV含量;各参数对PHAs组分的影响存在关联性。展望了调控活性污泥合成PHAs中单体组分的进一步研究方向。     

微生物塑料的研究现状及应用前景

综述了近几年来国内外聚羟基脂肪酸酯(PHAs)微生物合成的研究进展,同时对PHAs的应用前景进行了展望。     

Wood flour/polylactide biocomposites toughened with polyhydroxyalkanoates

Polylactide (PLA)‐based wood–plastic composites (WPCs) were successfully manufactured by extrusion blending followed by injection molding. The effects of polyhydroxyanoates (PHAs) on the mechanical and thermal properties and the morphologies of the PLA‐based WPCs were investigated with mechanical testing, thermal analysis, and scanning electronic microscopy (SEM). The inclusion of PHAs in the PLA‐based WPCs produced an increase in the impact resistance and a decrease in the tensile strength. The brittle–ductile transition of the impact strength for the PLA‐based WPCs toughened with PHAs was confirmed when the wood flour content was between 15 and 35 wt %. SEM images showed that the fracture surfaces of the PLA‐based WPCs toughened with PHAs were rougher than that of their nontoughened counterparts. The ternary PLA‐based WPCs exhibited ductile fracture during mechanical testing. Differential scanning calorimetry (DSC) showed that addition of PHAs into the composites caused deviations of the cold crystallization temperature and melting temperature of PLA. Thermogravimetric analysis indicated that the PHAs reduced the thermal stability of the PLA‐based WPCs. PHAs can be a green toughening agent for PLA‐based WPCs. The specific properties evidenced by the biocomposites may hint at their potential application, for example, in the automotive industry and civil engineering. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

脂肪族聚酯降解材料的研究进展

本文对脂肪族聚酯类生物降解材料聚乳酸(PLA)、聚己内酯(PCL)、聚羟基烷酸酯(PHAs)、聚丁二酸丁二醇酯(PBS)等进行了简单的综述,简要地介绍了其主要应用领域及存在的主要问题。     

Polyhydroxyalkanoates,a family of natural polymers,and their applications in drug delivery

Polyhydroxyalkanoates (PHAs) are natural biopolymers produced by various microorganisms as a reserve of carbon and energy. PHA synthesis generally occurs during fermentation under nutrient limiting conditions with excess carbon. There are two main types of PHAs, short chain length PHAs (scl‐PHAs) and medium chain length PHAs (mcl‐PHAs). The mechanical and thermal properties of PHAs depend mainly on the number of carbons in the monomer unit and its molecular weight. PHAs are promising materials for biomedical applications because they are biodegradable, non‐toxic and biocompatible. The large range of PHAs, along with their varying physical properties and high biocompatibility, make them highly attractive biomaterials for use in drug delivery. They can be used to produce tablets, micro‐ and nanoparticles as well as drug eluting scaffolds. A large range of different PHAs have been explored and the results obtained suggest that PHAs are excellent candidates for controlled and targeted drug delivery systems. © 2015 Society of Chemical Industry     

Surface Modification of Polyhydroxyalkanoates toward Enhancing Cell Compatibility and Antibacterial Activity

Biomaterials for in vivo application should induce positive interaction with various histocytes and inhibit bacteria inflection as well. Cells and/or bacteria response to the extracellular environment is therefore the basic principle to design the biomaterials surface in order to induce the specific biomaterial–biological interaction. Polyhydroxyalkanoate (PHAs) are of growing interests because of their natural origin, biodegradability, biocompatibility, and thermoplasticity; however, quite inert and intrinsic hydrophobic characteristics have hindered their extensive usage in medical applications. Surface modification of PHAs tailors the chemistry, wettability, and topography without altering the bulk properties, and introduces specific proteins/peptides and/or antibacterial agents to mediate cell–matrix interactions. This review describes the recent developments on the surface modification of PHAs to construct cell compatible and antibacterial surfaces.     

Bioconversion of residual soybean oil into polyhydroxyalkanoates

The aim of this study is to evaluate the bioconversion of residual soybean oil (RSO) into polyhydroxyalkanoates (PHAs) by selecting microorganism and fermentation condition in order to increase PHAs production. PHAs production by Cupriavidus necator IPT 026 using glucose (PHA 1) and RSO (PHA 2) as substrate is 1.15 ± 0.21 and 2.84 ± 0.04 g L^?1, respectively. FTIR spectra of PHAs were similar to data reported in literature. PHAs presented low crystallinity (PHA 1: 42.69%; PHA 2: 46.44%), high thermal stability (PHA 1: 271.78 °C; PHA 2: 272.52 °C), and low M_W (PHA 1: 140.69 kDa; PHA 2: 254.54 kDa). PHAs produced by RSO are potential candidates for industrial applications, especially ones that demand higher temperatures. This is the first study on the production and characterization of PHAs obtained by C. necator IPT 026 in culture with RSO. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46255.     

厌氧HRT对A/O除磷工艺的影响

为系统考察厌氧水力停留时间（AHRT）对生物除磷效果的影响，本文以实际生活污水作为进水，在实验室连续流厌氧／好氧（A／O）除磷系统稳定运行的基础上，统计了不同AHRT下系统除磷效果及胞内贮存物的变化。设计批式实验，考察了AHRT较长情况下生物增强除磷代谢过程，针对实验过程中出现的厌氧聚羟基链烷酸酯（PHAs）分解和厌氧糖原合成现象，提出聚磷不足情况下聚磷菌代谢的假想模式。最后根据实验结果指出A／O除磷工艺AHRT的确定应以PHAs的合成量最大作为控制目标。