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Simultaneous Determination of Gallic Acid and Quercetin in Leaf Extract of Madhuca longifolia from Myanmar by HPLC-DAD: Method Development and Validation AYE Thidaa, ONOOMAR Toyamab and MALAI Satiraphanc* Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Silpakorn University, Sanam Chandra Palace Campus, Nakhon Pathom, 73000, Thailand aayethida979@gmail.com, btoyama_o@ su.ac.th, csatiraphan_m@su.ac.th Keywords: HPLC-DAD, gallic acid, quercetin, Madhuca longifolia, phenolic compound Abstract.
Figure 1 Chemical structure of (A) Gallic acid and (B) Quercetin Material and Methods Chemicals.
Voucher specimens were deposited at the Department of Pharmaceutical Chemistry, Silpakorn University, Thailand.
Kokare, Selected Bioactive Natural Products for Diabetes Mellitus, in: Studies in Natural Products Chemistry.India, 2016, pp.287-322

Chevrotd Laboratory of Physical Chemistry of Polymers and Interfaces, University of Cergy-Pontoise, 5 mail Gay Lussac, Neuville sur Oise, 95031 Cergy-Pontoise Cedex, France a cedric.plesse@u-cergy.fr, b frederic.vidal@u-cergy.fr, c dominique.teyssie@u-cergy.fr, d Claude.chevrot@u-cergy.fr Keywords: conducting polymer, open-air electrochemical actuator, linear deformation, Interpenetrating Polymer Network, hollow fiber.
Such systems are then similar to "three layered" ones but their unusual built-in structure has solved all delamination problems.
MacFarlane, Chemistry of Materials, Vol. 15 (2003) p 2392-98 [5] D.
Chemistry 35 (1996) 1168 [11] Plesse C, Vidal F, Gauthier C, Pelletier JM, Teyssié D, Chevrot C.

Thirdly, during water being injected, those water swellable minute particles and impurities will assemble together and form particle group structure, which will plug pore of oil formation, therefore, resulting in decreasing formation permeability.
Here, chemical plugging removal method will be discussed primarily, which mainly include three classes, firstly, thermo-chemistry plugging removal method[7] uses chemical reaction releasing hot to degrade some materials, such as wax, gum, pitch, etc. , which can restore formation permeability.
Because there are some disadvantage influence factors, the method of thermo-chemistry plugging removal is not a kind of ideal one.
Secondly, hot gas acid plugging removal method [8] uses thermo-chemistry and oxidizing to remove the plugging removal, the application practice proves that this method has definite limitations, during the application, it will enhance cost, and this method is not fit for large scale extending.

The image of acetylated fibre depicts the surface corrosion and circular pot structures due to the removal of wax and hemicellulose from the fibre.
Mariatti, “Exploring the Potential of Betel Nut Husk Fiber as Reinforcement in Polymer Composites: Effect of Fiber Maturity,” Procedia Chemistry, vol. 4, no.
Chikkol Venkateshappa, “NATURAL ARECA FIBER: SURFACE MODIFICATION AND SPECTRAL STUDIES TYPE (METHOD/APPROACH) Spectral studies Council for Innovative Research,” Journal: Journal of Advances in Chemistry, vol. 10, no. 10, pp. 3263–3273, [Online].
Basavaraju, “Areca fiber reinforced epoxy composites: Effect of chemical treatments on impact strength,” Oriental Journal of Chemistry, vol. 31, no. 2, pp. 763–769, 2015, doi: 10.13005/ojc/310218

In recent years, Armillaria mellea has been widely investigated in structures and bioactivities.
Food Chemistry.119 (2010) 1633–1636
The biology and chemistry of hyperlipidemia, J.
Bioorganic & Medicinal Chemistry, 15(2007)4674−4699

A: Chemistry Vol. 185 (2007), p. 133 [14] K.Y.
A: Chemistry Vol. 167 (2004), p. 223 [29] I.
A: Chemistry, Vol. 161 (2004), p. 131 [31] C.
A: Chemistry, Vol. 161 (2004), p. 131 [36] T.
A: Chemistry, Vol. 161 (2004), p. 131 [66] T.

Isolation and Purification of Orientin and Isovitexin from Thlaspi arvense Linn Sai Pang2,Yan Ge2, Lisheng Wang1,a, Xu Liu1, Cuiwu Lin1, Hua Yang1 1School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China 2School of Pharmaceutical Sciences, Guangxi University of Chinese Medicine, Nanning 530001, China aCorresponding author.
Ethyl acetate fraction was separated by semi-preparative HPLC to give compound 1, and butanol fraction was continuously separated by D101 macroporous resin and semi-preparative HPLC to give compound 2, the chemical structures of two compounds were elucidated by 13C-NMR, 1H-NMR, Ms, UV and named as Orientin and Isovitexin (their purity > 98% using normalization method of HPLC).
The two main compounds Orientin and Isovitexin were separated by efficient half preparation liquid chromatography (RPLC) from Thlaspi arvense Linn, and their structures were identified by 13C-NMR, 1H-NMR, MS and UV.
Orientin and Isovitexin belong to flavonoids, which have stable structures, antibacterial and antitoxic activities.

Synthesis and Characterization of a Novel Liquid Crystalline Polymer Bearing Azobenzene Xin-de Tang1, a, Ye Chen2 , Xin Wang2, Fa-qi Yu2 and Mei-shan Pei2 1Institute of New Materials, Shandong Jiaotong University, Jinan 250023, China 2College of Chemistry and Chemical Engineering, University of Ji’nan, Jinan 250002, China axdtang8033@163.com Keywords: Liquid crystalline polymer; Azobenzene; Atom transfer radical polymerization (ATRP); Azo-polymer.
The structure of the resulting polymer was confirmed by nuclear magnetic resonance (NMR), and the molecular weight and its dispersity was characterized by gel permeation chromatography (GPC).
Recently, Zhang et al. reported the LC phase structures and transitions of a combined main-chain/side-chain LC polymer obtained from radical polymerization [6].
Results and Discussions Synthesis and Molecular Structure.

The structure and physical properties of LiNbO3 can be substantially changed by varying its composition [27-29]].
[25] Y.Al-Douri, Makram A.Fakhri, A.Bouhemadou, R.Khenata, M.Ameri, Stirrer time effect on optical properties of nanophotonic LiNbO3, Materials Chemistry and Physics 203 (2018) 243-248
T.Salim, U.Hashim, Heat treatment assisted-spin coating for LiNbO 3 films preparation: Their physical properties, Journal of Physics and Chemistry of Solids 131(2019) 180-188
Belmonte, and V.Pruneri, Micro structured integrated electro optic LiNbO3 modulators Laser & Photon.
Xu, Optical homogeneity and second harmonic generation in Li-rich Mg-doped LiNbO3 crystalsMaterials Chemistry and Physics 88 (2004) 97-101

When designing static push bearing, Manring replaced the traditional deep cavity by shallow cavity with changed geometric structure, simultaneously, adopted the different forms of throttle by our need, bringing comparatively large flexibility for application in engineering; Satish analyzed in theory and calculate the dynamic and static properties of round static pushing bearing with different oil chamber’s shape, finding that the performances of different chamber-type bearing are not same; Because the structure of oil film bearing influences the distribution of oil film, with the development of mechanical trend to high-speed and large-scale, the reliability, security and stability of oil film bearing are posed more demands.
Existed principal problems Hydraulic Dynamic and Static Bearing synthesizes the advantages of the hydrodynamic bearing and hydrostatic bearing, such as integer bearings and the surface of the structure of the Deep and shallow cavity.
Bearing and cabinet can be regarded as rigid connection because of integral structure and the large area of hole contact, which plays a full part in improving oil film stiffness (The static stiffness of bearing superimposed the dynamic stiffness of bearing ), then bearing carrying capacity is improved.
When the pressure of oil liquid decreased to air separated pressure, air is departed from oil liquid turns into air bubble that gradually grow up about the center of original small air bubble, burst up because of shear force, lead to produce heavier local impact force and metal fatigue that with the contact oil liquid, The oil film of bearing can appear local high temperature when the air bubble is adiabatic compression, which result that oil get black and produce corrosive action of chemistry, and these comprehensive action of physics and chemistry make element surface localized corrosion and even damaged, In a word, air bubble is a very harmful phenomenon when fluids are in work, and the harmfulness should be avoided or reduced [19].
Based on this research, it laid solid theoretical foundation for obtaining better distribution of oil temperature, designing the reasonable bearing’s structure, parameters and so on to build nonlinear characteristic mathematical model between oil temperature and pressure, rotational speed, load.