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Relationship between Struciure and Performance of Polyacrylates Used as Chelator in Detergents
Xia, Yong-mei,Cho, Heon-young,Fang, Yun,Liou, Xiao-ya,Suh, Jung-mok 한국공업화학회 2002 Journal of Industrial and Engineering Chemistry Vol.8 No.2
The effects of molecular weight and compositions of polyacrylates, i.e. sodium homopolyacrylates and modified polyacrylates on their tolerance to calcium ion (CaV), dispersancy and flocculence were investigated. The optimum formulations of phosphate-free detergent powder containing the polymers as substitute of phosphate in detergent were obtained by orthogonal test. By increasing the molecular weight of homopolyacrylate in testing range, their CaV are enhanced dramatically and the dispersancy are decreased but still are better than that of sodium tripolyphosphate (STPP). The modified polyacrylates were copolymerized with maleic anhydride (MA), methyl acrylate(AM) and acrylic acid (AA) with different compositions. The composition of copolymer affects its CaV slightly. By increasing the molecular weight in testing range, their CaV are enhanced moderately and the dispersancy of copolymer are slightly decreased. The flocculence of the polymer is enhanced by increasing the molecular weight, and is not related to type of the polymer but CaV of the polymer.
Thermodynamics and Kinetics of Lysozyme Adsorption onto Two Kinds of Weak Cation Exchangers
Yong-Mei Cheng,Xiong-Hua Jin,Dong Gao,Hai-Feng Xia,Jing-Hua Chen 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.5
The present work investigated the adsorption behaviors of lysozyme onto weak cation exchangers at different temperatures. The adsorption isotherm, adsorption thermodynamics and adsorption kinetics were studied. The results indicate that the adsorption of lysozyme onto acrylic acid copolymer based beads (Hydrolite D115) is spontaneous and exothermic, while that onto agarose based beads (CM Sepharose 6 Fast Flow) is also spontaneous, but endothermic. The pseudo second-order kinetic model fits well to the dynamic adsorption experimental data, and the kinetic results are also in concert with the adsorption thermodynamics.
Mei-Fang Chen,Yuan Yuan Zhang,Mei Di He,Cheng Yong Li,Chun Xia Zhou,Peng Zhi Hong,Zhong-Ji Qian 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.2
Marine microalgae have been widely applied in cosmaceuticals, nutraceuticals, and functional foods. In the present study, we first investigated the hepatoprotective effects of peptide purified from microalgae, Isochrysis zhanjiangensis on HepG2 cells alcoholic injury. I. zhanjiangensis was hydrolyzed utilizing chymotrypsin, trypsin, pepsin, and by vitro gastrointestinal digestion. Among hydrolysates, the gastrointestinal hydrolysate showed relatively high free radical scavenging ability preliminarily and was purified with following sequential chromatography methods. The amino acid sequence and molecular mass of the purified peptide from I. zhanjiangensis (PIZ) was identified as Asn-Asp-Ala-Glu-Tyr-Gly-Ile-Cys-Gly-Phe (NDAEYGICGF; MW, 1088.16 Da) via Q-TOF ESI/MS. Additionally, PIZ attenuated ethanol-induced cytotoxicity and inhibited the production of intracellular reactive oxygen species by DCFH-DA assay. Western blot results showed that superoxide dismutase (SOD) and glutathione (GSH) levels up-regulated with PIZ treatment before alcohol exposure while gamma-glutamyltransferase (GGT) protein expression down-regulated. These results provide an opportunity to discover new highly active peptide against alcohol toxicity in HepG2 cells.
조헌영,Yong-mei Xia 한국문화재보존과학회 2002 보존과학회지 Vol.11 No.1
문화재 보존을 위한 처리 과정에는 반드시 세척이 행하여지며, 이 때 세척은 완벽한 세정뿐만 아니라 2차 오염 발생이나 훼손 등에 각별히 조심하여야 한다. 따라서 본 연구에서는 보다 과학적인 방법으로 석조문화재 보존 처리용 세정제를 개발하기 위하여, 국내 석조물에 기생하는 미생물과 오물을 시료로 채취하여 FT-IR분석을 통하여 석재 오물의 화학적인 관능기를 파악하고, 각종 용매를 처리하여 그 용출 특성을 파악하였으며, 세정제에 의한 세정 효과와 풍화율에 대하여 연구하였다. 실험 결과로부터 석재 문화재 세정용 계면활성제로는 산성용액에서도 안정하며, 석재 구성물질과의 반응성이 적고, 각종 2차 오염 발생 가능성이 적으며, 산화제와 산의 활성을 증가시킬 수 있는 비이온 계면활성제가 적당한 것으로 판단되었다. 본 연구에서 개발한 복합형 세정제는 적용실험 결과, 석조 문화재 처리용 세정제로서 좋은 세정력을 가지고있는 것으로 판단된다.
Guided wave field calculation in anisotropic layered structures using normal mode expansion method
Lingfang Li,Hanfei Mei,Mohammad Faisal Haider,Dimitris Rizos,Yong Xia,Victor Giurgiutiu 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.2
The guided wave technique is commonly used in structural health monitoring as the guided waves can propagate far in the structures without much energy loss. The guided waves are conventionally generated by the surface-mounted piezoelectric wafer active sensor (PWAS). However, there is still lack of understanding of the wave propagation in layered structures, especially in structures made of anisotropic materials such as carbon fiber reinforced polymer (CFRP) composites. In this paper, the Rayleigh-Lamb wave strain tuning curves in a PWAS-mounted unidirectional CFRP plate are analytically derived using the normal mode expansion (NME) method. The excitation frequency spectrum is then multiplied by the tuning curves to calculate the frequency response spectrum. The corresponding time domain responses are obtained through the inverse Fourier transform. The theoretical calculations are validated through finite element analysis and an experimental study. The PWAS responses under the free, debonded and bonded CFRP conditions are investigated and compared. The results demonstrate that the amplitude and travelling time of wave packet can be used to evaluate the CFRP bonding conditions. The method can work on a baseline-free manner.
Dan-Jing Hu,Yong-Mei Xia,Jun-Ming Chen 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
A comparative study on lipase catalyzed production of middle chain diacylglycerol was conducted with esterification of glycerol and glycerolysis of triacylglycerol, respectively, in which high diacylglycerol yield and high acyl donor conversion are two desired goals. The esterification provided much higher acyl donor conversion than glycerolysis (with the conversion of 94.42% and 74.21%, respectively). The esterification in packed bed reactor produced more diacylglycerol than that in batch reactor (with relative content in the product of 77.26% and 45.45%, respectively). Mass transfer is one of the limitations during the procedure. Microwave irradiation provides higher reaction rate and selectivity in glycerolysis.
Hong-Li Zhang,Run-Mei Wang,Zhi-Ping Han,Yong-Fang Zhang,Jian-Xia Liu 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2
Bombycoidea comprises 10 families and 4723 species, and the phylogenetic relationships among families are still in debate. In this study, we have determined the complete mitochondrial genome (mitogenome) of Brahmaea porphyria. The 15,429-bp mitogenome contains a common set of 37 mitochondrial genes including 13 proteincoding genes, 22 transfer RNA genes (tRNAs), two ribosomal RNA genes (rRNAs) and an inferred control region, and shares the conserved gene rearrangement (trnM-trnI-trnQ) in most ditrysian mitogenomes. Moreover, we analysed the secondary structure for all the tRNA genes of B. porphyria and the preference of codon usage in the PCGs of B. porphyria. The putative 373-bp control region (CR) possesses three types of conserved elements, including ATAGA, Ploy-T stretch, and microsatellite-like elements. A phylogenetic analysis among available Bombycoidea mitogenomes using the concatenated 37 mitochondrial genes appears to support the hypothesis of (Sphingidae+Bombycidae)+Saturniidae and the relatively basal phylogenetic position of Brahmaeidae within Bombycoidea.
A facile enzymatic synthesis of partial glycerides in an up-flow column reactor
Hui-da Wan,Xue-yi Hu,서양곤,Yong-Mei Xia 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
A facile solvent-free synthesis of partial glycerol caprylates/caprates was studied using an enzyme packed bed reactor (EPBR). In the up-flow EPBR, without addition of molecular sieves or vacuum, the highest conversion of caprylic acid reached 90.2% in 4 h. As a comparison, a same reaction executed in an enzyme batch reactor (EBR) present the highest conversion of caprylic acid of 88% in 9 h with similar reaction conditions. In addition, the EPBR represented a good operating stability than that in EBR. The conversion decrement was only 6.5% for caprylic acid and 4.5% for capric acid after 30 runs (180 h),respectively.