Preparation of a composite monolith with functional graphene oxide and its application in the online enrichment of ursolic acid in medicinal plant

2020 ◽  
Vol 137 (36) ◽  
pp. 49081
Author(s):  
Huan Yu ◽  
Haiyan Liu ◽  
Xiaoya Pang ◽  
Miaomiao Zhang ◽  
Hongyuan Yan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Medicinal Plant ◽  
Ursolic Acid ◽  
Functional Graphene Oxide

Dielectric properties of photocrosslinkable polyimide/functional graphene oxide composites

2015 ◽  
Vol 157 ◽  
pp. 201-204 ◽  
Author(s):  
Zhigeng Chen ◽  
Jianqing Zhao ◽  
Shijing Yan ◽  
Yanchao Yuan ◽  
Shumei Liu
Keyword(s):  
Graphene Oxide ◽  
Dielectric Properties ◽  
Functional Graphene Oxide ◽  
Oxide Composites

scholarly journals Characterization and Quantification of Triterpenes in the Neotropical Medicinal Plant Souroubea sympetala (Marcgraviaceae) by HPLC-APCI-MS

2008 ◽  
Vol 3 (11) ◽  
pp. 1934578X0800301 ◽  
Author(s):  
Martha Mullally ◽  
Kari Kramp ◽  
Ammar Saleem ◽  
Marco Otorola Rojas ◽  
Pablo Sanchez Vindas ◽  
...  
Keyword(s):  
Medicinal Plant ◽  
Ursolic Acid ◽  
Betulinic Acid ◽  
Plant Organs ◽  
Immature Fruit ◽  
Pentacyclic Triterpenes ◽  
Wood Bark

A rapid, two-solvent, HPLC-APCI-MS method was developed to identify and quantify four pentacyclic triterpenes (betulinic acid, ursolic acid, α-amyrin and β-amyrin) in extracts of the neotropical medicinal plant Souroubea sympetala. Analysis of plant organs, wood, bark, leaves, immature fruit and flowers, indicated that the phytochemical distribution and quantity of triterpenes varies across the plant, with betulinic acid and ursolic acid the major constituents in the bark, wood, fruit and flowers and the amyrins the major constituents of the leaves.

Achieving high-performance epoxy nanocomposites with trifunctional poly(oxypropylene)amines functionalized graphene oxide

2019 ◽  
Vol 31 (5) ◽  
pp. 557-569 ◽  
Author(s):  
Tong Sun ◽  
Huawei Zou ◽  
Ya Zhou ◽  
Rui Li ◽  
Mei Liang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
High Performance ◽  
Flexural Modulus ◽  
Covalent Bonds ◽  
Spectra Analysis ◽  
Functionalized Graphene Oxide ◽  
Ep Matrix ◽  
Functional Graphene Oxide ◽  
The Relationship

In this article, two types of functional graphene oxide (GO) with amine-rich surface were synthesized through chemically grafting two different molecular chain length trifunctional poly(oxypropylene)amines T5000 and T403, which were named as T5000-GO and T403-GO, respectively. The functionalized GO was then added to epoxy (EP) resin. Fourier transform infrared spectra analysis confirmed successful chemical functionalization on GO. Both T403-GO and T5000-GO were tightly embedded in the EP, because the amine-rich surface of functionalized-GO could form covalent bonds with the EP matrix, thereby contributing to the enhancement of mechanical properties. Particularly, T5000-GO, which has longer grafting molecule chains, achieved better compatibility and dispersibility in the EP matrix, resulting in a better reinforcing efficiency in mechanical properties. For example, the T5000-GO/EP composites showed an incremental enhancement in tensile strength with increasing filler concentrations, whereas their T403-GO/EP counterparts failed to follow the same trend. Meanwhile, the T5000-GO/EP composites with only 0.1-wt% T5000-GO achieved a prominent increase in flexural strength (approximately 50%) and flexural modulus (approximately 26.8%), which were higher than those of T403-GO-filled counterparts. This work indicated that the compatibility and interphase between GO and EP could be designed by manipulating the length of grafting molecule chains, thereby providing a better understanding of the relationship between the structure and mechanical properties of the graphene/EP nanocomposites.

Shear-induced orientation of functional graphene oxide sheets in isotactic polypropylene

2016 ◽  
Vol 51 (11) ◽  
pp. 5185-5195 ◽  
Author(s):  
Lin Gan ◽  
Feng Qiu ◽  
Yong-Bo Hao ◽  
Kai Zhang ◽  
Zheng-Yong Zhou ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Isotactic Polypropylene ◽  
Functional Graphene Oxide ◽  
Graphene Oxide Sheets

scholarly journals Chemical Constituents of Dichloromethane Extract of CultivatedSatureja khuzistanica

2007 ◽  
Vol 4 (1) ◽  
pp. 95-98 ◽  
Author(s):  
Firouz Matloubi Moghaddam ◽  
Mahdi Moridi Farimani ◽  
Sabah Salahvarzi ◽  
Gholamreza Amin
Keyword(s):  
Spectral Analysis ◽  
Medicinal Plant ◽  
Ursolic Acid ◽  
Chemical Constituents ◽  
Natural Occurrence ◽  
Aerial Parts

Four compounds β-sitosterol, β-sitosterol-3-O-β-d-glucopyranoside, ursolic acid and 4′,5,6-trihydroxy-3′, 7-dimethoxyflavone were characterized from the dichloromethane extract of the aerial parts ofSatureja khuzistanica(Lamiaceae), a native medicinal plant growing in Iran, on the basis of spectral analysis and comparing with the data in literature. The natural occurrence of these compounds can be conclusive for the chemotaxonomic characterization of the genusSatureja.

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