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Chitosan Oligomer as a Hopeful Adjuvant for H5n1 Influenza Vaccine
( Le Van Hiep ),( Mai Thi Thanh ),( Dang Thi Hong Van ),( Vo Thi Phuong Khanh ),( Nguyen Anh Dzung ) 한국키틴키토산학회 2008 한국키틴키토산학회지 Vol.13 No.1
Effect of Chitosan oligomer (dp = 8-16) and other adjuvant such as: Aluminum phosphate (AlPO4) and Freund on immune response of H5N1 influenza vaccine in Swiss mice has been investigated. The Swiss mice were twice vaccinated alternative 20 days with dose 0.1 ml/mouse. After 10, 20 and 30 days, the immune response of Swiss mice with H5N1 vaccine was detected. The result showed that after 20 days of the first vaccination, immune response of chitosan oligomer test and Freund was 100%, but Freund test reduced 80% after 30days of vaccination. Meanwhile, immune response of the control and AlPO4 test was very low, only 40%. The Effect of chitosan oligomer and the others on antibody titer has been also investigated. The result showed that the antibody titer of chitosan oligomer test was 60 HIU (Hemagglutination units), 70 HIUs after 10 and 20 days of the first vaccination, and increased up to 112 HIUs after 10 days of the second vaccination and the antibody titer of the chitosan oligomer test was higher than the others. Therefore, chitosan oligomer is a hopeful adjuvant for H5N1 influenza vaccine.
Processed Vietnamese ginseng: Preliminary results in chemistry and biological activity
Thi Hong Van Le,Seo Young Lee,Tae Ryong Kim,Jae Young Kim,권성원,Ngoc Khoi Nguyen,박정일,Minh Duc Nguyen 고려인삼학회 2014 Journal of Ginseng Research Vol.38 No.2
Background: This study was carried out to investigate the effect of the steaming process on chemicalconstituents, free radical scavenging activity, and antiproliferative effect of Vietnamese ginseng. Methods: Samples of powdered Vietnamese ginseng were steamed at 120 C for various times and theirextracts were subjected to chemical and biological studies. Results: Upon steaming, contents of polar ginsenosides, such as Rb1, Rc, Rd, Re, and Rg1, were rapidlydecreased, whereas less polar ginsenosides such as Rg3, Rg5, Rk1, Rk3, and Rh4 were increased as reportedpreviously. However, ocotillol type saponins, which have no glycosyl moiety at the C-20 position,were relatively stable on steaming. The radical scavenging activity was increased continuously up to 20 hof steaming. Similarly, the antiproliferative activity against A549 lung cancer cells was also increased. Conclusion: It seems that the antiproliferative activity is closely related to the contents of ginsenosideRg3, Rg5, and Rk1.
Effects of steaming on saponin compositions and antiproliferative activity of Vietnamese ginseng
Thi Hong Van Le,Seo Young Lee,Gwang Jin Lee,Ngoc Khoi Nguyen,박정일,Minh Duc Nguyen 고려인삼학회 2015 Journal of Ginseng Research Vol.39 No.3
Background: Steaming of ginseng is known to change its chemical composition and biological activity. This study was carried out to investigate the effect of different steaming time-scales on chemical constituents and antiproliferative activity of Vietnamese ginseng (VG). Methods: VG was steamed at 105C for 2e20 h. Its saponin constituents and antiproliferative activity were studied. The similarity of chemical compositions between steamed samples at 105C and 120C were compared. Results: Most protopanaxadiol and protopanaxatriol ginsenosides lost the sugar moiety at the C-20 position with 10e14 h steaming at 105C and changed to their less polar analogues. However, ocotillol (OCT) ginsenosides were reasonably stable to steaming process. Antiproliferative activity against A549 lung cancer cells was increased on steaming and reached its plateau after 12 h steaming. Conclusion: Steaming VG at 105C showed a similar tendency of chemical degradation to the steaming VG at 120C except the slower rate of reaction. Its rate was about one-third of the steaming at 120C.
Effects of steaming on saponin compositions and antiproliferative activity of Vietnamese ginseng
Le, Thi Hong Van,Lee, Seo Young,Lee, Gwang Jin,Nguyen, Ngoc Khoi,Park, Jeong Hill,Nguyen, Minh Duc The Korean Society of Ginseng 2015 Journal of Ginseng Research Vol.39 No.3
Background: Steaming of ginseng is known to change its chemical composition and biological activity. This study was carried out to investigate the effect of different steaming time-scales on chemical constituents and antiproliferative activity of Vietnamese ginseng (VG). Methods: VG was steamed at $105^{\circ}C$ for 2-20 h. Its saponin constituents and antiproliferative activity were studied. The similarity of chemical compositions between steamed samples at $105^{\circ}C$ and $120^{\circ}C$ were compared. Results: Most protopanaxadiol and protopanaxatriol ginsenosides lost the sugar moiety at the C-20 position with 10-14 h steaming at $105^{\circ}C$ and changed to their less polar analogues. However, ocotillol (OCT) ginsenosides were reasonably stable to steaming process. Antiproliferative activity against A549 lung cancer cells was increased on steaming and reached its plateau after 12 h steaming. Conclusion: Steaming VG at $105^{\circ}C$ showed a similar tendency of chemical degradation to the steaming VG at $120^{\circ}C$ except the slower rate of reaction. Its rate was about one-third of the steaming at $120^{\circ}C$.
Processed Vietnamese ginseng: Preliminary results in chemistry and biological activity
Le, Thi Hong Van,Lee, Seo Young,Kim, Tae Ryong,Kim, Jae Young,Kwon, Sung Won,Nguyen, Ngoc Khoi,Park, Jeong Hill,Nguyen, Minh Duc The Korean Society of Ginseng 2014 Journal of Ginseng Research Vol.38 No.2
Background: This study was carried out to investigate the effect of the steaming process on chemical constituents, free radical scavenging activity, and antiproliferative effect of Vietnamese ginseng. Methods: Samples of powdered Vietnamese ginseng were steamed at $120^{\circ}C$ for various times and thei extracts were subjected to chemical and biological studies. Results: Upon steaming, contents of polar ginsenosides, such as Rb1, Rc, Rd, Re, and Rg1, were rapidly decreased, whereas less polar ginsenosides such as Rg3, Rg5, Rk1, Rk3, and Rh4 were increased as reported previously. However, ocotillol type saponins, which have no glycosyl moiety at the C-20 position, were relatively stable on steaming. The radical scavenging activity was increased continuously up to 20 h of steaming. Similarly, the antiproliferative activity against A549 lung cancer cells was also increased. Conclusion: It seems that the antiproliferative activity is closely related to the contents of ginsenoside Rg3, Rg5, and Rk1.
Minh Mang Thang, the Mysterious Vietnamese Prescription Containing Korean Ginseng
Thi Hong Van Le,Van Dan Nguyen,Manh Hung Tran 고려인삼학회 2024 인삼문화 Vol.6 No.1
Emperor Minh Mang (明命), the second ruler of the Nguyen Dynasty in Vietnam, reigned from 1820 to 1841. He is widely regarded by contemporary historians as the most distinguished monarch of his dynasty, despite some controversial policies. One aspect of his extraordinary legacy is the remarkable 142 offspring he sired - 78 princes and 64 princesses - earning him the unprecedented distinction of having the most progeny among kings in world history. Vietnamese people suppose Minh Mang's prolific reproductive success to the consumption of a specially prescribed medicine known as Minh Mang Thang (明命湯, MMT). This medicine, often associated with sexual potency and fertility, is characterized by intriguing names such as "One night Five sexes ," "One night Six sexes born Five babies ," or "Six sexes Three pregnancies ." Vietnamese folklore vividly recounts Minh Mang's exceptional sexual prowess, attributing it to the use of MMT. MMT formulations, which include various herbs, notably Korean ginseng, may incorporate additional botanical ingredients depending on their intended purpose. This paper aims to explore the origins, history, ingredients, and applications of MMT, unraveling the mystery behind this mystical prescription that has inspired several oriental medicinal researchers. Through this investigation, we seek to shed light on the cultural and historical contexts surrounding Minh Mang's use of MMT and its enduring impact on traditional Vietnamese medicine and folklore. Vietnam boasts a legendary herbal medicine recipe associated with Emperor Minh Mang, bearing the intriguing names "One night Five sexes ",1) "One night Six sexes born Five babies ",2) and "Six sexes Three pregnancies ".3) This unique medicinal concoction, simply known as Minh Mang Thang (MMT),4) has been the subject of numerous handed-down prescriptions. This paper aims to delve into the history, origin, prescription, and uses of MMT.
The Determinants of Environmental Information Disclosure in Vietnam Listed Companies
NGUYEN, Thi Le Hang,NGUYEN, Thi Thu Hien,NGUYEN, Thi Thanh Huyen,LE, Thi Hong Anh,NGUYEN, Van Cong Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.2
Environmental pollution and climate change in Vietnam are now becoming a major concern. This situation is increasing the pressure on the companies to improve their social responsibility in production and business activities and disclose the environmental information to meet the requirements of stakeholders. This study investigates the internal and external factors of the company that affects the environmental information disclosure of listed companies on the Vietnam stock market as business sector, firm size, corporate manager perceptions, profitability, financial leverage, community pressure, pressures from stakeholders, government pressure influencing environmental information disclosure. Analytical data collected through the survey of 120 listed companies on the Ho Chi Minh City Stock Exchange (HOSE). By testing Cronbach's Alpha, exploratory factor analysis (EFA) and logistic regression analysis, the results of the study show that the level of environmental information disclosure of listed companies on the stock market in Vietnam depends heavily on government regulations, followed by the pressure from stakeholders, community pressure, views of business managers, companies size, business sector, and particularly profitability and financial leverage factors that have a negative relationship with environmental information disclosure.