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David G. Popovich,Yiyu Lee,Lu Li,Wei Zhang 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.3
A triterpenoid containing bitter melon (Momordica charantia) seed (BMS) extract was found to reduce cultured 3T3-L1 cell viability. The 50% lethal concentration values were determined to be 0.78 ± 0.01 mg/mL at 24 hours, 0.69 ± 0.01 mg/mL at 48 hours, and 0.56 ± 0.02 mg/mL at 72 hours. 3T3-L1 cells were utilized as models of pre-adipocyte to adipocyte differentiation. BMS extract also caused a G_2/M arrest in the cell cycle reducing cells by 23.9%, 37.7%, and 34.7% compared with the control after 72 hours of treatment at concentrations of 0.4, 0.5, and 0.6 mg/mL respectively. BMS extract did not increase the release of lactate dehydrogenase from 3T3-L1 cells, which was unexpected. Furthermore, BMS extract reduced lipid accumulation during differentiation from pre-adipocyte to adipocyte corresponding to reduction in overall triglyceride of 32.4% after 72 hours compared with untreated control cells. BMS is an underutilized agricultural commodity that may have potential for nutraceutical and functional food development.
Ginsenosides analysis of New Zealand-grown forest Panax ginseng by LC-QTOF-MS/MS
Chen, Wei,Balan, Prabhu,Popovich, David G. The Korean Society of Ginseng 2020 Journal of Ginseng Research Vol.44 No.4
Background: Ginsenosides are the unique and bioactive components in ginseng. Ginsenosides are affected by the growing environment and conditions. In New Zealand (NZ), Panax ginseng Meyer (P. ginseng) is grown as a secondary crop under a pine tree canopy with an open-field forest environment. There is no thorough analysis reported about NZ-grown ginseng. Methods: Ginsenosides from NZ-grown P. ginseng in different parts (main root, fine root, rhizome, stem, and leaf) with different ages (6, 12, 13, and 14 years) were extracted by ultrasonic extraction and characterized by Liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry. Twenty-one ginsenosides in these samples were accurately quantified and relatively quantified with 13 ginsenoside standards. Results: All compounds were separated in 40 min, and a total of 102 ginsenosides were identified by matching MS spectra data with 23 standard references or published known ginsenosides from P. ginseng. The quantitative results showed that the total content of ginsenosides in various parts of P. ginseng varied, which was not obviously dependent on age. In the underground parts, the 13-year-old ginseng root contained more abundant ginsenosides among tested ginseng samples, whereas in the aboveground parts, the greatest amount of ginsenosides was from the 14-year-old sample. In addition, the amount of ginsenosides is higher in the leaf and fine root and much lower in the stem than in the other parts of P. ginseng. Conclusion: This study provides the first-ever comprehensive report on NZ-grown wild simulated P. ginseng.
Nikolay G. Razumov,Anatoly A. Popovich,QingSheng Wang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.2
This paper presents the results of experimental studies on the treatment of Fe–23Cr–11Mn–1N high-nitrogen stainlesssteel powder alloys, synthesized by the mechanical alloying (MA) of elemental powders in the flow of a thermal plasma. Fe–23Cr–11Mn–1N high-nitrogen stainless steel powder alloys were prepared by MA in the attritor under an argon atmosphere. For spheroidization of Fe–23Cr–11Mn–1N high-nitrogen stainless steel powder alloys, the TekSphero 15 plantmanufactured by Tekna Plasma Systems Inc was used. The studies have shown the possibility of obtaining Fe–23Cr–11Mn–1N high-nitrogen spherical powders steel alloys from the powder obtained by MA. According to the results of a series ofexperiments, it was found that the results of plasma spheroidization of powders essentially depend on the size of the fractiondue to some difference in the particle shape and flowability, and on the gas regime of the plasma torch. It is established thatduring the plasma spheroidization process, some of the nitrogen leaves the alloy. The loss rate of nitrogen depends on thesize of the initial particles.
Ginsenosides analysis of New Zealand – grown forest Panax ginseng by LC-QTOF-MS/MS
Wei Chen,Prabhu Balan,David G. Popovich 고려인삼학회 2020 Journal of Ginseng Research Vol.44 No.4
Background: Ginsenosides are the unique and bioactive components in ginseng. Ginsenosides areaffected by the growing environment and conditions. In New Zealand (NZ), Panax ginseng Meyer(P. ginseng) is grown as a secondary crop under a pine tree canopy with an open-field forest environment. There is no thorough analysis reported about NZ-grown ginseng. Methods: Ginsenosides from NZ-grown P. ginseng in different parts (main root, fine root, rhizome, stem,and leaf) with different ages (6, 12, 13, and 14 years) were extracted by ultrasonic extraction and characterizedby Liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry. Twenty-one ginsenosides in these samples were accurately quantified and relatively quantified with 13ginsenoside standards. Results: All compounds were separated in 40 min, and a total of 102 ginsenosides were identified bymatching MS spectra data with 23 standard references or published known ginsenosides from P. ginseng. The quantitative results showed that the total content of ginsenosides in various parts of P. ginsengvaried, which was not obviously dependent on age. In the underground parts, the 13-year-old ginsengroot contained more abundant ginsenosides among tested ginseng samples, whereas in the abovegroundparts, the greatest amount of ginsenosides was from the 14-year-old sample. In addition, the amount ofginsenosides is higher in the leaf and fine root and much lower in the stem than in the other parts ofP. ginseng. Conclusion: This study provides the first-ever comprehensive report on NZ-grown wild simulatedP. ginseng.
Tagir Makhmutov,Nikolay Razumov,Artem Kim,Nikolay Ozerskoy,Alina Mazeeva,Anatoliy Popovich 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1
Spherical powders of CoCrFeNiMnW0.25high-entropy alloy were obtained from elemental powders by mechanical alloying(MA) at various energy modes followed by plasma spheroidization. Samples obtained from low-energy MA-powdershave an inhomogeneous microstructure and phase composition. Samples obtained from MA-powders with homogeneousstructures have a high degree of sphericity and chemical homogeneity; the face-centered cubic solid solution represents thephase composition of the powders. The resulting powders can be used in powder-based additive manufacturing technologies.