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Determination of Tocopherol Contents in Refined Edible Oils Using an HPLC Method
Jiang-Ning Hu,Xue-Mei Zhu,Prakash Adhikari,Dan Li,In-Hwan Kim,Ki-Teak Lee 한국식품영양과학회 2009 Preventive Nutrition and Food Science Vol.14 No.3
A high-performance liquid chromatography method was applied to determine the contents of tocopherols in edible oils using a LiChrosorb DIOL HPLC column and hexane fortified with 0.1% acetic acid in an isocratic mode. The validation of the method included tests for linearity, sensitivity, accuracy, precision, and recovery. All calibration curves showed good linear regression (r<SUP>2</SUP>>0.9995) within the tested ranges. The established method offered good precision and accuracy with overall intra-day and inter-day variations of 0.94~4.27 and 1.77~4.88%, respectively. The tocopherol recoveries ranged from 91.44~108.90%. Subsequently, the method was successfully applied to qualitatively and quantitatively determine the total contents of α, γ, and δ-tocopherols in 12 selected refined edible oils, showing a range of 0.92 to 188.71 mg/100 g.
Myoelectric Control of Artificial Limbs—Is There a Need to Change Focus? [In the Spotlight]
Ning Jiang,Dosen, S.,Muller, K-R,Farina, D. IEEE 2012 IEEE signal processing magazine Vol.29 No.5
<P>In this article, the basic concept of myoelectric control and the state of the art in both industry and academia will be presented. It will emerge that there is a gap between industrial and academic achievements and that this gap will continue to expand unless a change of focus in systems for myoelectric control occurs.</P>
Jiang-Ning Hu,Bin Shan,Ze-Yuan Deng,Jing Li,Ya-Wei Fan,Rong Liu,Zheng Ruan 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.6
A high-speed counter-current chromatography (HSCCC) method was developed for isolation of 5alkaloids from lotus (Nelumbo nucifera Gaertn.) leaves. The 2-phase solvent system of HSCCC composed of light petroleum-ethyl acetate-methanol-water was set up in 2-step separation process in the proportion of 3:5:3:5 for isolation of N-nornuciferine and armepavine, and in the proportion of 1:5:1:5 for that of anonaine, pronuciferine,and nuciferine. The purity of anonaine (14.6mg), pronuciferine (29.7 mg), N-nornuciferine (31.4 mg), nuciferine (22.1 mg),and armepavine (23.3 mg) isolated from 150 mg crude extract of lotus leaves were examined as 95.6, 88.2, 92.5,94.3, and 92.1%, respectively.
A Scalable and Robust Approach to Collaboration Enforcement in Mobile Ad-Hoc Networks
Jiang Ning,Hua Kien A.,Liu, Danzhou The Korea Institute of Information and Commucation 2007 Journal of communications and networks Vol.9 No.1
Mobile ad-hoc networks (MANETs) have attracted great research interest in recent years. Among many issues, lack of motivation for participating nodes to collaborate forms a major obstacle to the adoption of MANETs. Many contemporary collaboration enforcement techniques employ reputation mechanisms for nodes to avoid and penalize malicious participants. Reputation information is propagated among participants and updated based on complicated trust relationships to thwart false accusation of benign nodes. The aforementioned strategy suffers from low scalability and is likely to be exploited by adversaries. In this paper, we propose a novel approach to address these problems. With the proposed technique, no reputation information is propagated in the network and malicious nodes cannot cause false penalty to benign hosts. Nodes classify their one-hop neighbors through direct observation and misbehaving nodes are penalized within their localities. Data packets are dynamically rerouted to circumvent selfish nodes. As a result, overall network performance is greatly enhanced. This approach significantly simplifies the collaboration enforcement process, incurs low overhead, and is robust against various malicious behaviors. Simulation results based on different system configurations indicate that the proposed technique can significantly improve network performance with very low communication cost.
Jiang Ning Hu,Jeung-Hee Lee,Jung Ah Shin,Jae Eul Choi,Ki-Teak Lee 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.2
A high performance liquid chromatography (HPLC) method has been successfully developed to identify and quantify major ginsenosides in Korean ginseng seeds and roots. Using gradient elution of acetonitrile and water without buffer, the 6 major ginsenosides (Rb<sub>1</sub>, Rb<sub>2</sub>, Rc, Rd, Re, and Rg<sub>1</sub>) were identified. Compared with ginseng roots, the amount of ginsenoside Re and Rd in ginseng seeds were significantly higher than those in ginseng roots (p<0.05). In ginseng seeds, the content of protopanaxtriol (PPT) was higher than that of protopanaxdiol (PPD) and the ratio of PPT and PPD was approximately 2.2 : 1. However, the content of PPT was lower than that of PPD in ginseng roots. It should be mentioned that both content of PPT and PPD in ginseng seeds were much higher than those in ginseng roots.
Production of Lipase-catalyzed Structured Lipids from Mustard Oil with Capric acid
Jiang-Ning Hu,Md. Abdul Alim,Jeung-Hee Lee,Prakash Adhikari,Ki-Teak Lee 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.2
To reduce the content of undesirable erucic acid in mustard oil (MO), it was enzymatically modified with capric acid using immobilized lipase TL IM to produce structured lipid (SL). After reaction, the content of erucic acid was reduced up to 21.7% under the performed reactions in this study. Meanwhile, unsaturated fatty acids existing at sn-2 position (oleic acid, linoleic acid, and linolenic acid) in MO were not much changed.
Determination of Tocopherol Contents in Refined Edible Oils Using an HPLC Method
Hu, Jiang-Ning,Zhu, Xue-Mei,Adhikari, Prakash,Li, Dan,Kim, In-Hwan,Lee, Ki-Teak The Korean Society of Food Science and Nutrition 2009 Preventive Nutrition and Food Science Vol.14 No.3
A high-performance liquid chromatography method was applied to determine the contents of tocopherols in edible oils using a LiChrosorb DIOL HPLC column and hexane fortified with 0.1% acetic acid in an isocratic mode. The validation of the method included tests for linearity, sensitivity, accuracy, precision, and recovery. All calibration curves showed good linear regression ($r^2$>0.9995) within the tested ranges. The established method offered good precision and accuracy with overall intra-day and inter-day variations of 0.94$\sim$4.27 and 1.77$\sim$ 4.88%, respectively. The tocopherol recoveries ranged from 91.44$\sim$108.90%. Subsequently, the method was successfully applied to qualitatively and quantitatively determine the total contents of $\alpha$, $\gamma$, and $\delta$-tocopherols in 12 selected refined edible oils, showing a range of 0.92 to 188.71 mg/100 g.
Wen-Ning Xu,Huo-Liang Zheng,Run-Ze Yang,Tao Liu,Wei Yu,Xin-Feng Zheng,Bo Li,Sheng-Dan Jiang,Lei-Sheng Jiang 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-
The main pathological mechanism of intervertebral disc degeneration (IVDD) is the programmed apoptosis of nucleus pulposus (NP) cells. Oxidative stress is a significant cause of IVDD. Whether mitophagy is induced by strong oxidative stress in IVDD remains to be determined. This study aimed to investigate the relationship between oxidative stress and mitophagy and to better understand the mechanism of IVDD in vivo and in vitro. To this end, we obtained primary NP cells from the human NP and subsequently exposed them to TBHP. We observed that oxidative stress induced mitophagy to cause apoptosis in NP cells, and we suppressed mitophagy and found that NP cells were protected against apoptosis. Interestingly, TBHP resulted in mitophagy through the inhibition of the HIF-1α/NDUFA4L2 pathway. Therefore, the upregulation of mitochondrial NDUFA4L2 restricted mitophagy induced by oxidative stress. Furthermore, the expression levels of HIF-1α and NDUFA4L2 were decreased in human IVDD. In conclusion, these results demonstrated that the upregulation of NDUFA4L2 ameliorated the apoptosis of NP cells by repressing excessive mitophagy, which ultimately alleviated IVDD. These findings show for the first time that NDUFA4L2 and mitophagy may be potential therapeutic targets for IVDD.
Thermodynamic simulation and structural optimization of the collimator in the drift duct of EAST-NBI
Tang Ning,Hu Chun-dong,Xie Yuan-lai,Wei Jiang-long,Cui Zhi-Wei,Xie Jun-Wei,Pan Zhuo,Jiang Yao 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11
The collimator is one of the high-heat-flux components used to avoid a series of vacuum and thermal problems. In this paper, the heat load distribution throughout the collimator is first calculated through experimental data, and a transient thermodynamic simulation analysis of the original model is carried out. The error of the pipe outlet temperature between the simulated and experimental values is 1.632%, indicating that the simulation result is reliable. Second, the model is optimized to improve the heat transfer performance of the collimator, including the contact mode between the pipe and the flange, the pipe material and the addition of a twisted tape in the pipe. It is concluded that the convective heat transfer coefficient of the optimized model is increased by 15.381% and the maximum wall temperature is reduced by 16.415%; thus, the heat transfer capacity of the optimized model is effectively improved. Third, to adapt the long-pulse steady-state operation of the experimental advanced superconducting Tokamak (EAST) in the future, steady-state simulations of the original and optimized collimators are carried out. The results show that the maximum temperature of the optimized model is reduced by 37.864% compared with that of the original model. The optimized model was changed as little as possible to obtain a better heat exchange structure on the premise of ensuring the consumption of the same mass flow rate of water so that the collimator can adapt to operational environments with higher heat fluxes and long pulses in the future. These research methods also provide a reference for the future design of components under high-energy and long-pulse operational conditions