PHÁT HIỆN MỘT SỐ THUỐC HẠ GLUCOSE MÁU TRỘN LẪN TRONG CHẾ PHẨM DƯỢC LIỆU BẰNG PHƯƠNG PHÁP SẮC KÝ LỎNG HIỆU NĂNG CAO (HPLC)

Circular No. 10/2021/TT-BYT stipulated that several hypoglycemic drugs, such as metformin hydrochloride, are prohibited from adulterating medicinal herbal preparations. Therefore, this study aims to develop a procedure to detect five hypoglycemic drugs, including metformin hydrochloride, glibenclamide, gliclazide, glimepiride, and glipizide, adulterated in herbal preparations by using the high-performance liquid chromatography (HPLC) method. The chromatographic program includes the methanol:phosphate buffer pH 3 mobile phase 70/30 (v/v), chromatographic column C18 (250 × 4.6 mm, 5 μm), and analysis time of 25 minutes. The procedure has high specificity, accuracy and precision, according to AOAC. We detected six herbal products reacting positively with glibenclamide and one with both metformin hydrochloride and glibenclamide.Thông tư số 10/2021/TT-BYT quy định một số thuốc hạ glucose máu, như metformin hydroclorid, là các chất cấm trộn lẫn trong chế phẩm có nguồn gốc từ dược liệu. Do đó, mục tiêu nghiên cứu này là xây dựng quy trình phát hiện năm loại hoạt chất hạ glucose máu, gồm metformin hydroclorid, glibenclamid, gliclazid, glimepirid và glipizid, trộn lẫn trong chế phẩm có nguồn gốc dược liệu bằng phương pháp sắc ký lỏng hiệu năng cao (HPLC). Chúng tôi đã xây dựng được chương trình sắc ký gồm hệ pha động methanol:đệm phosphat pH 3 với tỷ lệ 30/70 (v/v), cột sắc ký C18 (250 × 4,6 mm, 5 μm), và thời gian phân tích 25 phút. Phương pháp thẩm định có tính đặc hiệu cao, độ đúng, độ lặp lại và độ tái lặp cao, đạt yêu cầu theo AOAC. Chúng tôi đã phát hiện bảy mẫu chế phẩm dược liệu dương tính trong đó sáu mẫu dương tính với glibenclamid và một mẫu dương tính đồng thời với metformin và glibenclamid

ẢNH HƯỞNG CỦA VITAMIN E BỔ SUNG VÀO THỨC ĂN ĐẾN HIỆU QUẢ SINH SẢN, CHẤT LƯỢNG TRỨNG VÀ ẤU TRÙNG CÁ KHOANG CỔ NEMO (Amphiprion ocellaris (CUVIER, 1830))

This study was carried out to determine the effects of vitamin E (a-tocopherol) in five levels (0, 125, 250, 375 and 500 mg vitamin E/kg feed) in broodfish diets on reproductive, egg and larval quality parameters of clownfish (Amphirion ocellaris). Each treatment was repeated in triplicate and the supplemental feeding trial was arranged for 13 months. The result showed that there were no significant differences in re-maturation and spawning periods, spawning frequency, fecundity, egg diameter and larval size of Nemo fish observed between the treatments. However, diets supplemented with vitamin E positively influenced the rate of egg loss, hatching rate of egg and survival rate of the 3 days post hatch. The overall result of this experiment indicated that the optimum vitamin E requirement of clownfish for reproductive performance was 375 mg vitamin E/kg feed.Thí nghiệm được thực hiện nhằm xác định ảnh hưởng của vitamin E (0, 125, 250, 375 và 500 mg/kg thức ăn) được bổ sung trong thức ăn cá bố mẹ đến các chỉ số sinh sản, chất lượng trứng và ấu trùng cá khoang cổ Nemo (Amphiprion ocellaris). Mỗi nghiệm thức được lặp lại 3 lần và thí nghiệm được tiến hành trong 13 tháng. Kết quả đã cho thấy thời gian tái thành thục và sinh sản, tần suất sinh sản, sức sinh sản thực tế, đường kính trứng và kích thước ấu trùng không bị ảnh hưởng bởi chế độ ăn bổ sung vitamin E ở các mức khác nhau. Tuy nhiên, chế độ ăn có bổ sung vitamin E đã ảnh hưởng tích cực đến tỷ lệ hao hụt của trứng, tỷ lệ trứng nở và tỷ lệ sống của ấu trùng 3 ngày tuổi. Kết quả nghiên cứu chỉ ra rằng nhu cầu vitamin E tối ưu của cá khoang cổ Nemo đạt được hiệu quả sinh sản là 375 mg vitamin E/kg thức ăn

Kinetics of neutralizing antibodies against Omicron variant in Vietnamese healthcare workers after primary immunization with ChAdOx1-S and booster immunization with BNT162b2

We studied the development and persistence of neutralizing antibodies against SARS-CoV-2 ancestral strain, and Delta and Omicron (BA.1 and BA.2) variants in Vietnamese healthcare workers (HCWs) up to 15 weeks after booster vaccination. We included 47 HCWs, including group 1 (G1, N = 21) and group 2 (G2; N = 26) without and with breakthrough Delta variant infection before booster immunization, respectively). The study participants had completed primary immunization with ChAdOx1-S and booster vaccination with BNT162b2. Neutralizing antibodies were measured using a surrogate virus neutralization assay. Of the 21 study participants in G1, neutralizing antibodies against ancestral strain, Delta variant, BA.1, and BA.2 were (almost) abolished at month 8 after the second dose, but all had detectable neutralizing antibodies to the study viruses at week 2 post booster dose. Of the 26 study participants in G2, neutralizing antibody levels to BA.1 and BA.2 were significantly higher than those to the corresponding viruses measured at week 2 post breakthrough infection and before the booster dose. At week 15 post booster vaccination, neutralizing antibodies to BA.1 and BA.2 dropped significantly, with more profound changes observed in those without breakthrough Delta variant infection. Booster vaccination enhanced neutralizing activities against ancestral strain and Delta variant compared with those induced by primary vaccination. These responses were maintained at high levels for at least 15 weeks. Our findings emphasize the importance of the first booster dose in producing cross-neutralizing antibodies against Omicron variant. A second booster to maintain long-term vaccine effectiveness against the currently circulating variants merits further research

Effects of water scarcity awareness and climate change belief on recycled water usage willingness: Evidence from New Mexico, United States

The global water crisis is being exacerbated by climate change, even in the United States. Recycled water is a feasible alternative to alleviate the water shortage, but it is constrained by humans’ perceptions. The current study examines how residents’ water scarcity awareness and climate change belief influence their willingness to use recycled water directly and indirectly. Bayesian Mindsponge Framework (BMF) analytics was employed on a dataset of 1831 residents in Albuquerque, New Mexico, an arid inland region in the US. We discovered that residents’ willingness to use direct recycled potable water is positively affected by their awareness of water scarcity, but the effect is conditional on their belief in the impacts of climate change on the water cycle. Meanwhile, the willingness to use indirect recycled potable water is influenced by water scarcity awareness, and the belief in climate change further enhances this effect. These findings implicate that fighting climate change denialism and informing the public of the water scarcity situation in the region can contribute to the effectiveness and sustainability of long-term water conservation and climate change alleviation efforts

Spatiotemporal evolution of SARS-CoV-2 Alpha and Delta variants during large nationwide outbreak of COVID-19, Vietnam, 2021

We analyzed 1,303 SARS-CoV-2 whole-genome sequences from Vietnam, and found the Alpha and Delta variants were responsible for a large nationwide outbreak of COVID-19 in 2021. The Delta variant was confined to the AY.57 lineage and caused >1.7 million infections and >32,000 deaths. Viral transmission was strongly affected by nonpharmaceutical interventions

Determination of Chemical Constituents of Curcuma Zedoaria Rhizomes in Champasak - Laos and Gialai - Vietnam

Analysis results obtained by using GC-MS method show that there are differences in both the number and types of compounds that have been identified in curcuma zedoaria rhizomes in Champasak (Laos) and Gia Lai (Vietnam). The total number of constituents that have been identified in curcuma zedoaria rhizomes in Champasak is 36, in which the constituents of the essential oil and of the extract are 25 and 27 respectively.There are 16 constituents that are present in both the essential oil and the extract.The constituent with the highest designation content is Benzofuran, 6-ethenyl-4,5,6,7-tetrahydro-3,6-dimethyl-5-isopropenyl-trans- with 44.02% in the hexane extract. Meanwhile, the total number of constituents that have been identified in curcuma zedoaria rhizomes in GiaLai is 31, in which the constituents of the essential oil and of the extract are 17 and 18 respectively.There are 4 constituents that are present in both the essential oil and the extract. The constituent with the highest designation content is Curdion with 26.30% in the essential oil. This demonstrates that the composition and quantity of the constituent chemical compounds in curcuma zedoaria depend on climatic conditions and terrain where the plants survive and grow

Resveratrol suppressed lps-induced cox-2 VIA miR-146a-5p inhibition in raw246.7 cells

Trans-resveratrol (Res) is a well-known natural stilbene frequently found in grapes which have been reported to possess antioxidant, anti-cancer activities and inhibited COX-2 expression. MicroRNAs (miRNAs) are short endogenous non-coding RNAs involved in the regulation of mRNA stability and protein synthesis. In our research, resveratrol isolated from Vitis heyneana Roem. & Schult Vitis heyneana was observed to suppress lipopolysaccharides (LPS)-induced COX-2 expression in Raw264.7 cells in a dose dependent manner. Using qPCR it was revealed that LPS induced the expression of miR-25, miR- 125a, miR-125b, miR-146a-5p, miR-146a-3p and miR-455. However, we only observed miR-146a-5p expression significantly decreased in resveratrol compared to untreated-control group. In addition, resveratrol abrogated the effect of miR-146a-5p mimic induced-COX-2 expression in Raw264.7 cells. Taken together, this study demonstrated for the first time the involvement of miR-146a-5p in resveratrol inhibited LPS-induced COX-2 expression in Raw264.7 cells

Kinetic Model of Moisture Loss and Polyphenol Degradation during Heat Pump Drying of Soursop Fruit (Annona muricata L.)

The aim of this study is to investigate the impact of time and temperature of the heat pump drying process of soursop slices at different levels on moisture content and total polyphenol content (TPC). Twelve types of classical kinetic models have been used in this work to describe the suitability of experimental data with models. The conformity is assessed based on statistical values (e.g., coefficient of determination (R2), Chi–square value (X2), etc.). The loss of moisture in the material is described in accordance with Fick’s diffusion law. Value of moisture rate (MR), and effective moisture diffusivities (Deff) have been identified. Experimental results show that MR value depends on the time and drying temperature, Deff increases when increasing the drying temperature from 20–50 °C with values of 1.24 × 10−9, 1.85 × 10−8, 7.69 × 10−8, and 5.54 × 10−7 m/s2. The Singh et al. model is the best option to describe the moisture of the sliced soursop drying process at 30 °C (R2 = 0.97815). The largest TPC decomposition occurs at a temperature of 50 °C. The ability to decompose TPC is proportional to the drying temperature. The TPC decomposition dynamic model follows a first–order reaction when drying at 20 °C with a determinant coefficient R2 = 0.9693