In this work,we measure the Raman scattering cross sections（RSCSs） of the carbon-carbon（CC） stretching vibrational modes of canthaxanthin in benzene,acetone,n-heptane,cyclohexane,and m-xylene.It is found that the ...In this work,we measure the Raman scattering cross sections（RSCSs） of the carbon-carbon（CC） stretching vibrational modes of canthaxanthin in benzene,acetone,n-heptane,cyclohexane,and m-xylene.It is found that the absolute RSCS of CC stretching mode of canthaxanthin reaches a value of 10 24 cm ^-2 ·molecule ^-1 ·sr ^-1 at 8×10 ^-5 M,which is 6 orders of magnitude larger than general RSCS（10 30 cm 2 ·molecule 1 ·sr 1）,and the RSCSs of canthaxanthin in various solvents are very different due to the hydrogen bond.A theoretical interpretation of the magnetic experimental results is given,which is introduced in a qualitative nonlinear model of coherent weakly damped electron-lattice vibration in the structural order of polyene chains.In addition,the optimal structure and the bond length alternation（BLA） parameter of canthaxanthin are calculated using quantum chemistry calculation（at the b3lyp/6-31g（d,p） level of theory）.The theoretical calculations are in good agreement with the experimental results.Furthermore,the combination of Raman spectroscopy and the quantum chemistry calculation study would be a quite suitable method of studying the structures and the properties of the π-conjugated systems.展开更多
A series of studies were conducted to establish a methodology for the accurate and efficient determination of canthaxanthin in feed ingredients. Agilent ZORBAX Eclipse DB-C 18 analytical column （4.6×150 mm, 5μm...A series of studies were conducted to establish a methodology for the accurate and efficient determination of canthaxanthin in feed ingredients. Agilent ZORBAX Eclipse DB-C 18 analytical column （4.6×150 mm, 5μm） was used and kept at 25 ℃. The mobile phase was acetonitrile ： methanol （v/v）=95 ： 5, and eluted compounds were detected by DAD absorbance （470 nm）. The flow rate was maintained at 1.0 mL·min^-1. The response of the method was linear over the range 1.0-20.0 μg·mL^-1 canthaxanthin assay solution （R^2=0.9998）. Recovery assays done with standard canthaxanthin to feed ingredient resulted in an average recovery of 103%. Variation coefficient was less than 3.53%. This method is proved to be simple, precise, sensitive and reproductive.展开更多
Raman spectra and ultraviolet-visible（UV-Vis） absorption spectra of linear polyene molecule-canthaxan-thin in n-hexane are measured and analyzed.In addition,the optimized structure of canthaxanthin was calculated vi...Raman spectra and ultraviolet-visible（UV-Vis） absorption spectra of linear polyene molecule-canthaxan-thin in n-hexane are measured and analyzed.In addition,the optimized structure of canthaxanthin was calculated via density functional theory（DFT） functional B3LYP.With decreasing the concentration,Raman scattering cross section （RSCS） of fundamental frequency is extremely high,and the UV-Vis absorption bands become narrower.The results of coherent weakly damped electron-Lattice vibration model were analyzed.展开更多
We report on a temperature-dependent resonance Raman spectral characterization of the polyene chain of canthax- anthin. It is observed that all vibrational intensities of the polyene chain are inversely proportional t...We report on a temperature-dependent resonance Raman spectral characterization of the polyene chain of canthax- anthin. It is observed that all vibrational intensities of the polyene chain are inversely proportional to temperature, which is analyzed by the resonance Raman effect and the coherent weakly damped electron/lattice vibrations. The increase in intensity of the CC overtone/combination relative to the fundamental with temperature decreasing is detected and discussed in terms of electron/phonon coupling and the activation energy Uop. Moreover, the polyene chain studies using the density functional theory B3LYP/6-31 G＊ level reveal a prominent peak at 1525 cm-1 consisting of two closely spaced modes that are both dominated by C=C stretching coordinates of the polyene chain.展开更多
Background： Dietary canthaxanthin（CX）, 25-hydroxycholecalciferol（25-OH-D3） and vitamins have been widely reported to be involved in productive and reproductive performance of broiler breeders. However, limited in...Background： Dietary canthaxanthin（CX）, 25-hydroxycholecalciferol（25-OH-D3） and vitamins have been widely reported to be involved in productive and reproductive performance of broiler breeders. However, limited information is available for duck breeders. In this study, a total of 1,560 Cherry Valley SM3 duck breeder females and 312 males were used to assess if the addition of CX and 25-OH-D3 could increase the performance of duck breeders under two different dietary vitamin regimens. Four diets were used under a 2 × 2 factorial arrangement with 2 kinds of vitamin premixes（REGULAR and HIGH; HIGH premix had higher levels of all vitamins except K3 than REGULAR premix）, and with or without the supplementation of the mixture of CX（6 mg/kg） and 25-OH-D3（0.069 mg/kg）. The ducks were fed ad libitum with pelleted diets based on corn-soybean meal from 38 to 77 wk of age.Results： HIGH vitamin premix decreased malondialdehyde（MDA） level（P 〈 0.001） of egg yolk, increased hatchability of fertile eggs（P = 0.029）, increased hatchability of total eggs（P = 0.029）, and decreased serum protein carbonyl level（P = 0.037） of breeder males. The mixture of CX and 25-OH-D3 increased serum calcium of breeder females（P = 0.010）, decreased the cracked egg rate（P = 0.001）, increased the pigmentation of egg yolk（P 〈 0.001）and male bill（P 〈 0.001）, and decreased MDA level of egg yolk（P 〈 0.001） and male serum（P = 0.034）. Interactive effects were observed in cracked egg rate（P = 0.038）, shell thickness（P = 0.011） and serum phosphorus（P = 0.026）of breeder females. HIGH vitamin premix together with the mixture of CX and 25-OH-D3 decreased cracked egg rate and increased shell thickness of duck breeders. Serum phosphorus was decreased in duck breeder females fed REGULAR vitamin premix without the addition of the CX and 25-OH-D3 mixture.Conclusions： Dietary HIGH vitamin premix increased antioxidant status of eggs and breeder males, and increased hatchability. The mixture of CX and 25-OH-D3 enhanced egg shell quality, and promoted pigmentation and antioxidant status of eggs and breeder males.展开更多
Triplet-triplet extinction coefficients for astaxanthin （I） and canthaxanthin （II） in different deaerated polarity solutions of MeCN and benzene were evaluated by laser flash photolysis at 298 K in the spectral re...Triplet-triplet extinction coefficients for astaxanthin （I） and canthaxanthin （II） in different deaerated polarity solutions of MeCN and benzene were evaluated by laser flash photolysis at 298 K in the spectral region from 350 to 650 nm by energy transfer method, employing 2-acetonaphthone as sensitizer. The triplet-triplet extinction coeffi- cients in MeCN and benzene were different in terms of the carotenoid present. The maximum triplet-triplet extinc- tion coefficient was 0.1-1.7 ×10^5 L·mol^-1·cm^-1 in different solvents. The rate constants of triplet decay were I： 1.25×10^10 L·mol^-1·s^-1, II： 1.12×10^10 L·mol^-1·s^-1 in MeCN; and I： 1.75×10^10 L·mol^-1, II： 3.27×10^10 L·mol^-1·s^-1 in benzene. The bimolecular rate constants of energy transfer from triplet excited 2-acetonaphthone to carotenoids were determined from the linear regression of the decay rate constant of 2-acetonaphthone triplet at varying carotenoid concentrations. The triplet lifetimes of ^3AST^＊ and 3CAN^＊ in different solvents were also determined. The results indicated that triplet energy transfer was nearly diffusion-controlled.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 11004252 and 10974067)the National Basic Research Program of China (Grant No. 2012CB722802)
文摘In this work,we measure the Raman scattering cross sections（RSCSs） of the carbon-carbon（CC） stretching vibrational modes of canthaxanthin in benzene,acetone,n-heptane,cyclohexane,and m-xylene.It is found that the absolute RSCS of CC stretching mode of canthaxanthin reaches a value of 10 24 cm ^-2 ·molecule ^-1 ·sr ^-1 at 8×10 ^-5 M,which is 6 orders of magnitude larger than general RSCS（10 30 cm 2 ·molecule 1 ·sr 1）,and the RSCSs of canthaxanthin in various solvents are very different due to the hydrogen bond.A theoretical interpretation of the magnetic experimental results is given,which is introduced in a qualitative nonlinear model of coherent weakly damped electron-lattice vibration in the structural order of polyene chains.In addition,the optimal structure and the bond length alternation（BLA） parameter of canthaxanthin are calculated using quantum chemistry calculation（at the b3lyp/6-31g（d,p） level of theory）.The theoretical calculations are in good agreement with the experimental results.Furthermore,the combination of Raman spectroscopy and the quantum chemistry calculation study would be a quite suitable method of studying the structures and the properties of the π-conjugated systems.
文摘A series of studies were conducted to establish a methodology for the accurate and efficient determination of canthaxanthin in feed ingredients. Agilent ZORBAX Eclipse DB-C 18 analytical column （4.6×150 mm, 5μm） was used and kept at 25 ℃. The mobile phase was acetonitrile ： methanol （v/v）=95 ： 5, and eluted compounds were detected by DAD absorbance （470 nm）. The flow rate was maintained at 1.0 mL·min^-1. The response of the method was linear over the range 1.0-20.0 μg·mL^-1 canthaxanthin assay solution （R^2=0.9998）. Recovery assays done with standard canthaxanthin to feed ingredient resulted in an average recovery of 103%. Variation coefficient was less than 3.53%. This method is proved to be simple, precise, sensitive and reproductive.
基金Supported by the National Natural Science Foundation of China(No.10974067)the Natural Science Foundation of Jilin Province,China(No.20101508)the Technology Development Projects of Jilin Province,China(No.20090534)
文摘Raman spectra and ultraviolet-visible（UV-Vis） absorption spectra of linear polyene molecule-canthaxan-thin in n-hexane are measured and analyzed.In addition,the optimized structure of canthaxanthin was calculated via density functional theory（DFT） functional B3LYP.With decreasing the concentration,Raman scattering cross section （RSCS） of fundamental frequency is extremely high,and the UV-Vis absorption bands become narrower.The results of coherent weakly damped electron-Lattice vibration model were analyzed.
基金supported by the National Natural Science Foundation of China(Grant Nos.10974067 and 11104107)the Program of Jilin Province Science and Technology Department,China(Grant Nos.20090534 and 20101508)the China Postdoctoral Science Foundation,China(Grant No.20110491320)
文摘We report on a temperature-dependent resonance Raman spectral characterization of the polyene chain of canthax- anthin. It is observed that all vibrational intensities of the polyene chain are inversely proportional to temperature, which is analyzed by the resonance Raman effect and the coherent weakly damped electron/lattice vibrations. The increase in intensity of the CC overtone/combination relative to the fundamental with temperature decreasing is detected and discussed in terms of electron/phonon coupling and the activation energy Uop. Moreover, the polyene chain studies using the density functional theory B3LYP/6-31 G＊ level reveal a prominent peak at 1525 cm-1 consisting of two closely spaced modes that are both dominated by C=C stretching coordinates of the polyene chain.
基金National and Sichuan Provincial Science and Technology Projects(2014BAD13B02,2014NZ0030 and 2013NC0047)Academy of Kechuang Feed Industry in SichuanDSM(China)Ltd
文摘Background： Dietary canthaxanthin（CX）, 25-hydroxycholecalciferol（25-OH-D3） and vitamins have been widely reported to be involved in productive and reproductive performance of broiler breeders. However, limited information is available for duck breeders. In this study, a total of 1,560 Cherry Valley SM3 duck breeder females and 312 males were used to assess if the addition of CX and 25-OH-D3 could increase the performance of duck breeders under two different dietary vitamin regimens. Four diets were used under a 2 × 2 factorial arrangement with 2 kinds of vitamin premixes（REGULAR and HIGH; HIGH premix had higher levels of all vitamins except K3 than REGULAR premix）, and with or without the supplementation of the mixture of CX（6 mg/kg） and 25-OH-D3（0.069 mg/kg）. The ducks were fed ad libitum with pelleted diets based on corn-soybean meal from 38 to 77 wk of age.Results： HIGH vitamin premix decreased malondialdehyde（MDA） level（P 〈 0.001） of egg yolk, increased hatchability of fertile eggs（P = 0.029）, increased hatchability of total eggs（P = 0.029）, and decreased serum protein carbonyl level（P = 0.037） of breeder males. The mixture of CX and 25-OH-D3 increased serum calcium of breeder females（P = 0.010）, decreased the cracked egg rate（P = 0.001）, increased the pigmentation of egg yolk（P 〈 0.001）and male bill（P 〈 0.001）, and decreased MDA level of egg yolk（P 〈 0.001） and male serum（P = 0.034）. Interactive effects were observed in cracked egg rate（P = 0.038）, shell thickness（P = 0.011） and serum phosphorus（P = 0.026）of breeder females. HIGH vitamin premix together with the mixture of CX and 25-OH-D3 decreased cracked egg rate and increased shell thickness of duck breeders. Serum phosphorus was decreased in duck breeder females fed REGULAR vitamin premix without the addition of the CX and 25-OH-D3 mixture.Conclusions： Dietary HIGH vitamin premix increased antioxidant status of eggs and breeder males, and increased hatchability. The mixture of CX and 25-OH-D3 enhanced egg shell quality, and promoted pigmentation and antioxidant status of eggs and breeder males.
基金Project supported by the National Natural Science Foundation of China （No. 10675158）.
文摘Triplet-triplet extinction coefficients for astaxanthin （I） and canthaxanthin （II） in different deaerated polarity solutions of MeCN and benzene were evaluated by laser flash photolysis at 298 K in the spectral region from 350 to 650 nm by energy transfer method, employing 2-acetonaphthone as sensitizer. The triplet-triplet extinction coeffi- cients in MeCN and benzene were different in terms of the carotenoid present. The maximum triplet-triplet extinc- tion coefficient was 0.1-1.7 ×10^5 L·mol^-1·cm^-1 in different solvents. The rate constants of triplet decay were I： 1.25×10^10 L·mol^-1·s^-1, II： 1.12×10^10 L·mol^-1·s^-1 in MeCN; and I： 1.75×10^10 L·mol^-1, II： 3.27×10^10 L·mol^-1·s^-1 in benzene. The bimolecular rate constants of energy transfer from triplet excited 2-acetonaphthone to carotenoids were determined from the linear regression of the decay rate constant of 2-acetonaphthone triplet at varying carotenoid concentrations. The triplet lifetimes of ^3AST^＊ and 3CAN^＊ in different solvents were also determined. The results indicated that triplet energy transfer was nearly diffusion-controlled.
