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Soy Protein Isolate Film by Incorporating Mandelic Acid as Well as Through Fermentation Mediated by Bacillus Subtilis 被引量:2
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作者 Rakesh Kumar Priya Rani K.Dinesh Kumar 《Journal of Renewable Materials》 SCIE 2019年第2期103-115,共13页
Soy protein isolate(SPI)biopolymeric films were prepared by adding different contents of mandelic acid(1 to 5%wrt SPI)to glycerol plasticized SPI by solution casting method.Also,SPI was fermented by Bacillus subtilis ... Soy protein isolate(SPI)biopolymeric films were prepared by adding different contents of mandelic acid(1 to 5%wrt SPI)to glycerol plasticized SPI by solution casting method.Also,SPI was fermented by Bacillus subtilis to get fermented SPI films by solution casting.Molecular mass determination of mandelic acid incorporated and fermented SPI films was carried out by sodium dodecyl sulphate-polyacrylamide gel electrophoresis(SDS-PAGE).Mandelic acid incorporated and fermented SPI films were characterized by Fourier-transform infrared spectroscopy(FT-IR),dynamic mechanical analysis(DMA),tensile strength,water uptake and optical transmittance studies.Results indicated that incorporation of mandelic acid in SPI resulted in high tensile strength(8.03 MPa)and highα-relaxation(Tα)as well as low water uptake.On the other hand,films cannot be prepared from fermented SPI with SPI contents of 8%and 12%.However,film from fermented SPI with 16%SPI content could be prepared but it exhibited low tensile strength(3.18 MPa)and low Tαas well as high water uptake.The resulting mandelic acid incorporated SPI films were also subjected to antimicrobial studies.At all the concentration of mandelic acid,we can easily observe the antimicrobial effect in mandelic acid incorporated SPI films unlike fermented SPI films.This work will be helpful in fabricating antimicrobial SPI film from renewable resources. 展开更多
关键词 Soy protein isolate mandelic acid FERMENTATION FILM tensile properties antimicrobial properties
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Enantioselective extraction of mandelic acid enantiomers based on chiral ligand exchange 被引量:1
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作者 唐课文 黄可龙 《Journal of Central South University of Technology》 2005年第2期123-128,共6页
Based on the chiral ligand exchange, the distribution behavior of mandelic acid enantiomers, and the partition of Cu2+ at different pH values were studied in a water/alcohol two-phase system containing Cu2+ and N-n-(... Based on the chiral ligand exchange, the distribution behavior of mandelic acid enantiomers, and the partition of Cu2+ at different pH values were studied in a water/alcohol two-phase system containing Cu2+ and N-n-(dodecyl-L-proline(A).) The influences of the solvent sort, the pH value, the concentrations of Cu2+ and chiral ligand on the partition coefficient(K) and separation factor(α) were discussed. The experimental results show that the A formed has more stable ternary complex with D-mandelic acid enantiomer than with L-mandelic acid enantiomer. There is an important influence of the pH value on K and α. When the pH values are less than 3.5, the formation of binary complexes is thermodynamically unfavourable. K and α become maximum when pH values are above 3.5 and the molar ratio of the chiral ligand to Cu2+ is 2∶1. 展开更多
关键词 ligand exchange EXTRACTION chiral separation mandelic acid enantiomers
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Optical Separation of Racemic Phenyl-alanine, and Structure of Complex Consisting of R-Phenylalanine and R-Mandelic Acid
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作者 HUZi-Qiang XUDuan-Jun +2 位作者 XUYuan-Zhi WUJing-Yun CHIANGMichaelY 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2004年第1期38-40,共3页
The racemic phenylalanine has been separated by (R)-mandelic acid through the formation of diastereomeric molecular complex. The crystal of the title chiral complex (C8H8O3 C9H11NO2, Mr = 317.33) belongs to monoclinic... The racemic phenylalanine has been separated by (R)-mandelic acid through the formation of diastereomeric molecular complex. The crystal of the title chiral complex (C8H8O3 C9H11NO2, Mr = 317.33) belongs to monoclinic, space group C2 with a = 19.391(3), b = 5.715(4), c = 15.755(3) ? b = 115.23(1), V = 1579(1) 3, Z = 4, Dc = 1.335 g/cm3, F(000) = 672, m = 0.099 mm-1, R = 0.033 and wR = 0.060 for 1278 observed reflections (I > 2s(I)). The complex consists of (R)-mandelic acid and (R)-phenylalanine in 1:1 molar ratio, and the complex molecules form layered crystal structure by self-assembly through intermolecular H-bonding between carboxyl and carboxylate of the neighboring molecules. 展开更多
关键词 optical separation crystal structure mandelic acid PHENYLALANINE
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Mandelic Acid Single-Crystal Growth:Experiments vs Numerical Simulations
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作者 Q.Tan S.A.Hosseini +2 位作者 A.Seidel-Morgenstern D.Thevenin H.Lorenz 《Communications in Computational Physics》 SCIE 2023年第1期77-100,共24页
Mandelic acid is an enantiomer of interest in many areas,in particular for the pharmaceutical industry.One of the approaches to produce enantiopure mandelic acid is through crystallization from an aqueous solution.We ... Mandelic acid is an enantiomer of interest in many areas,in particular for the pharmaceutical industry.One of the approaches to produce enantiopure mandelic acid is through crystallization from an aqueous solution.We propose in this study a numerical tool based on lattice Boltzmann simulations to model crystallization dynamics of(S)-mandelic acid.The solver is first validated against experimental data.It is then used to perform parametric studies concerning the effects of important parameters such as supersaturation and seed size on the growth rate.It is finally extended to investigate the impact of forced convection on the crystal habits.Based on there parametric studies,a modification of the reactor geometry is proposed that should reduce the observed deviations from symmetrical growth with a five-fold habit. 展开更多
关键词 mandelic acid phase-field model lattice Boltzmann method ventilation effect
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Separation of mandelic acid and its derivatives with new immobilized cellulose chiral stationary phase 被引量:2
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作者 Jie ZHOU Qian LIU +1 位作者 Guang-jun FU Zhen-zhong ZHANG 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2013年第7期615-620,共6页
A new liquid chromatographic method has been developed for the chiral separation of the enantiomers of mandelic acid and their derivatives 2-chloromandelic acid, 4-hydroxymandelic acid, 4-methoxymandelic acid, and 3,4... A new liquid chromatographic method has been developed for the chiral separation of the enantiomers of mandelic acid and their derivatives 2-chloromandelic acid, 4-hydroxymandelic acid, 4-methoxymandelic acid, and 3,4,5-trismethoxymandelic acid. The enantiomers were separated by a CHIRALPAKIC (250 mm×4.6 mm, 5 μm). Mandelic acid, 4-methoxymandelic acid, and 3,4,5-trismethoxymandelic acid were baseline resolved (resolution factor (RS )=2.21, RS =2.14, and RS =3.70, respectively). In contrast, the enantioselectivities between CHIRALPAKIC and 2-chloromandelic acid and 4-hydroxymandelic acid investigated were low. By comparing the chromatographs of mandelic acid enantiomers and mandelic acid spiked with (R)-mandelic acid, it was determined that the first effluent was (R)-mandelic acid. 展开更多
关键词 CHIRALPAKIC Enantiomeric separation High-performance liquid chromatography (HPLC) mandelic acid DERIVATIVES
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Synthesis,structure and spectroscopic studies of europium complex with S(+)-mandelic acid
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作者 M.Babij A.Mondry 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第12期1188-1191,共4页
The Eu^3+ complexes with S(+)-mandelic acid were synthesized in the form of powders by mixing aqueous solutions of EuCl3, S(+)-mandelic acid and NaOH in different molar ratios. The powders were characterized by... The Eu^3+ complexes with S(+)-mandelic acid were synthesized in the form of powders by mixing aqueous solutions of EuCl3, S(+)-mandelic acid and NaOH in different molar ratios. The powders were characterized by elemental analysis, X-ray powder diffraction (XRPD.) method, Fourier transform infrared (FTIR) and Raman spectroscopy, UV-vis reflectance and luminescence spectra as well as luminescence lifetime measurements. It was found that all studied powders of Eu^3+ complexes with S(+)-mandelic acid were isostructural and crystalline and formed compounds with the formula Eu(Man)3(H2O)2. 展开更多
关键词 EUROPIUM mandelic acid EMISSION FTIR spectroscopy Raman sDectroscopy rare earths
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Molecular Basis for Stereospecific Hydrolysis of Ethyl Mandelate by Thermophilic Esterase
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作者 ZHANG Guo-yan TAO Jin +1 位作者 ZHENG Liang-yu CAO Shu-gui 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2011年第5期841-844,共4页
The stereospecific hydrolysis of mandelate can be effectively catalyzed by hyperthermophilic acylpeptide esterase APE 1547(Aeropyrum pernix esterase 1547). APE 1547 used in this reaction showed a remarkable stereodi... The stereospecific hydrolysis of mandelate can be effectively catalyzed by hyperthermophilic acylpeptide esterase APE 1547(Aeropyrum pernix esterase 1547). APE 1547 used in this reaction showed a remarkable stereodi-scrimination in favour of R-mandelic acid(99% e.e.) with an enantiomeric ratio E〉200. The results of computer simulation are consistent with the experimental results. It can be inferred that the R-substrate adopted a binding mode productive of the reaction due to the formation of the hydrogen bond at the active site of APE 1547. 展开更多
关键词 Hyperthermophilic acylpeptide esterase BIOCATALYST Stereospecific hydrolysis mandelic acid Computer simulation
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