http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/1 Tất cả chứa ở đây Wed, 16 Sep 2026 02:45:14 GMT 2026-09-16T02:45:14Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21849 Tín chỉ cacbon từ hệ sinh thái rừng ngập mặn và tiềm năng phát triển sinh kế bền vững của cộng đồng ven biển Việt Nam Nguyễn, Tâm; Nguyễn, Linh Trong bối cảnh biến đổi khí hậu và xu hướng phát triển thị trường cacbon, tín chỉ cacbon từ hệ sinh thái rừng ngập mặn là một giải pháp tiềm năng nhằm góp phần giảm phát thải khí nhà kính và hỗ trợ phát triển bền vững vùng ven biển. Bài báo này nhằm tổng quan về cơ sở khoa học về tín chỉ cacbon từ rừng ngập mặn, phân tích tiềm năng phát triển tại Việt Nam và đánh giá khả năng đóng góp cho sinh kế cộng đồng ven biển. Kết quả nghiên cứu cho thấy rừng ngập mặn Việt Nam có tiềm năng lớn trong phát triển tín chỉ cacbon. Tuy nhiên, việc phát triển lĩnh vực này vẫn còn gặp nhiều hạn chế như thiếu hệ thống đo lường - báo cáo - thẩm định (MRV) hoàn chỉnh, chi phí triển khai cao và cơ chế chia sẻ đồng lợi ích chưa rõ ràng. Nghiên cứu cũng cho thấy tín chỉ cacbon có thể tạo nguồn tài chính hỗ trợ bảo tồn rừng và phát triển sinh kế bền vững cho cộng đồng ven biển. Từ đó, đề xuất hoàn thiện khung pháp lý, nâng cao năng lực kỹ thuật và thúc đẩy các dự án thí điểm trong thời gian tới. Fri, 11 Sep 2026 00:00:00 GMT http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21849 2026-09-11T00:00:00Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21848 Chemical and Photochemical Profiles of Selected Vietnamese Fruit By-Products Le, Xuan Son; Nguyen, Duy Nhut; Nguyen, Dinh Thuat; Nguyen, Van Long; Nguyen, Duy Linh; Dang, Thi Thanh Truyen; Dang, Xuan Cuong Aims: This study characterized the chemical, mineral, and photochemical properties of underutilized tropical fruit by-products in Vietnam—banana pseudostems, dragon fruit peels, and durian husks—to assess their potential in biomaterials, nutraceuticals, and circular agriculture. Study design: Experimental cross-sectional compositional analysis with international benchmarking. Place and Duration of Study: Ho Chi Minh University of Industry and Trade, Vietnam. Samples were collected from U Minh Thượng (An Giang), Bình Thuận, and Đắk Lắk. Methodology: Freeze-dried and ground samples were analyzed for proximate composition, minerals, polyphenols, carotenoids, and betalains using AOAC methods, HPLC–DAD, and UV– Vis/fluorescence spectroscopy. All analyses were performed in triplicate (n = 3). Results: Banana pseudostems were rich in cellulose (38.4%) and hemicellulose (22.5%), highlighting their suitability as lignocellulosic feedstocks. Dragon fruit peels contained betalains (2.45 ± 0.12 mg/g DW) and polyphenols (12.4 mg GAE/g DW), confirming strong antioxidant and pigment potential. Ri6 durian husks exhibited distinct carotenoid and phenolic acid profiles, with elevated calcium (355 mg/100 g DW) and phosphorus (138 mg/100 g DW). Photochemical assays revealed UV-absorbing activity of banana phenolics, photolability of dragon fruit betalains, and stability of durian carotenoids. Comparative analysis with India, Thailand, and Malaysia confirmed Vietnamese samples fall within global ranges while demonstrating cultivar-specific advantages. Conclusion: These findings highlight Vietnamese banana pseudostems, dragon fruit peels, and Ri6 durian husks as promising agro-industrial by-products. Their valorization into bioplastics, natural pigments, nutraceuticals, and compost aligns with circular bioeconomy goals and supports sustainable resource utilization. Wed, 01 Jan 2025 00:00:00 GMT http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21848 2025-01-01T00:00:00Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21847 The first report on the marine snail Phos senticosus (Linnaeus, 1758) causing a tetrodotoxin poisoning in Viet Nam Dao, Viet Ha; Le, Ho Khanh Hy; Pham, Xuan Ky; Nguyen, Phuong Anh; Phan, Bao Vy; Doan, Thi Thiet; Phan, Minh Thu; Nguyen, Ngoc Tung Tetrodotoxin (TTX) and two of its derivatives were detected in two horseshoe crab specimens that were leftover poisonous food in Vietnam using hydrophilic interaction liquid chromatography linked to tandem mass spectrometry (HILICMS/MS) analysis. According to the results, TTX accounted for almost 90% of the total toxicity in both specimens (4.2 and 30.3 g g−1). This was followed by 4,9- anhydroTTX (anh-TTX) (2.8 and 17.1 g g−1) and 4-epimerTTX (4-TTX) (1.9 and 11.4 g g−1). By the phylogenetic analysis based on COXI, two specimens were subsequently identified to be Carcinoscopius rotundicauda, a horseshoe crab that is known to be found across Vietnam and occasionally regarded as local seafood in coastal regions. Together with its strong lethal potency, it was suggested that TTX was the source of food poisoning in Vietnam brought on by the consumption of C. rotundicauda. At 146.2 MU g−1, specimen 2′s toxicity was almost seven times greater than specimen 1′s (20.3 MU g−1). The fact that poisoning symptoms were only observed in those who consumed specimen 2 could be explained by individual differences in TTX toxicity in this horseshoe crab species. To the best of our knowledge, TTX caused by eating horseshoe crabs was originally reported in Vietnam. According to the study, TTX in horseshoe crabs poses a threat to seafood safety in Vietnam. Wed, 01 Jan 2025 00:00:00 GMT http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21847 2025-01-01T00:00:00Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21846 The first report on the marine snail Phos senticosus (Linnaeus, 1758) causing a tetrodotoxin poisoning in Viet Nam Dao, Viet Ha; Le, Ho Khanh Hy; Bui, Quang Nghi; Phan, Bao Vy; Nguyen, Phuong Anh; Doan, Thi Thiet; Phan, Minh Thu; Nobuhisa, Kajino; Kwang-Sik, Choi; Nguyen, Dang Duc; Pham, Xuan Ky The neurotoxic poisonings that result in death with fatalities caused by consumption of Nassarius snails have been reported in Viet Nam but the causative toxin has only been identified in a small number of cases. A poisoning incident by eating marine snails happened in Binh Thuan Province, Viet Nam in March 2021. The leftover food from the incident, 29 snail specimens, later were identified as all Phos senticosus (Linnaeus, 1758) were collected for identification of causative toxin. At 60.7 ± 126.5 µg/g, anh-TTX was detected in the most dominant level, followed by tetrodotoxin (TTX) (46.0 ± 107.6 µg/g) and 4-epiTTX (23.3 ± 24.3 µg/g) by hydrophilic interaction liquid chromatography-tandem mass spectrometry (HILIC-MS/MS) analysis. Overall toxicity was assessed to be 229 ± 526 MU/g in the snail specimens that responded mostly to TTX due to its strong potency. All specimens were reported as toxic in toxicity range of 10–2,672 MU/g, which is comparable to what was found in some other Nassarius species in Taiwan and Viet Nam. Of 29 specimens, 75.8% showed toxicity in the range of 10–100 MU/g, 17.3% indicated toxicity in the range of 100––1,000 MU/g, whereas 6.9% displayed toxicity that was exceptionally high (> 1,000 MU/g). The data demonstrates that TTX is accountable for this poisoning incident. Notebly, it is the first report on TTX in P. senticosus causing the seafood poisoning in Viet Nam, highlighting the threat this species poses to human consumption. As a result, there ought to be a more severe warning about its potential cause of poisoning. Thu, 01 Jan 2026 00:00:00 GMT http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21846 2026-01-01T00:00:00Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21845 Study on biocharacteristics of Symbiodinium sp. isolated from soft coral in coastal water of Quang Nam, south central Vietnam. Dang, Diem Hong; Pham, Van Nhat; Hoang, Thi Huong Quynh; Luu, Thi Tam; Ngo, Thi Hoai Thu; Nguyen, Cam Ha; Hoang, Thi Lan Anh; Nguyen, Hoai Nam; Nguyen, Thi Minh Hang; Chau, Van Minh Phototrophic dinoflagellates of the genus Symbiodinium (= zooxanthellae) are well known as symbionts of corals. They play an important role in maintaining the healthy as well as establishment of new reefs. In addition, products such as toxins or pigments from these symbiotic microalgae are potentially important for applications in the biomedical sciences, especially in new drug development. In this study, we isolated successfully a symbiotic microalga from soft coral Sinularia sp. which was collected in Cu Lao Cham coastal waters of Quang Nam province. Based on morphological characteristics and 18S rRNA gene sequences, isolated SHM8 strain was identified as Symbiodinium goreaui. This symbiont was cultured in different media such as ASP-A8, F2, ES, IMK, K, and L1. L1 culture medium supplemented with taurine concentration of 4.88 mM led to the cell density of SHM8 strain increased in 50% compared to control on day 2 in cultivation; amino acid mixture enhanced cell density by 31.7% on day 5 in cultivation. Supplementation of carbon source (bicarbonate salt of 16.8 g/L) and nitrogen source (nitrate salt of 0.055 g/L) enhanced the cell density by 40% and 27%, respectively on day 6 in culture. Obtained results in this study proved that this microalga can live independently without host. Successful isolation and cultivation of Symbiodinium microalga are one of the necessary conditions for promising researches on the natural bioactive substances from this microalgal biomass in the future in Vietnam. Fri, 11 Sep 2026 00:00:00 GMT http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21845 2026-09-11T00:00:00Z