Science and Technology Development Journal - Natural Sciences http://stdjns.scienceandtechnology.com.vn/index.php/stdjns <p><span id="result_box" class="" lang="en"><span title="Tạp chí đã được phát hành tại các thư viện của các đơn vị thành viên của ĐHQG-HCM, các Sở Khoa học Công nghệ của các tỉnh thành trên cả nước và được Hội đồng học hàm Giáo sư Nhà nước đánh giá cao."><strong>Science and Technology Development Journal</strong> - <strong>Natural Science</strong> <strong>(STDJNS)</strong> (<strong>2588-106X</strong>) is the official journal of Viet Nam National University Ho Chi Minh City, Viet Nam, published by Viet Nam National University Ho Chi Minh City, Viet Nam. STDNS has been developed and separated from section of <strong>Nature Sciences</strong> of <strong>Science &amp; Technology Development Journal</strong> (<strong>STDJ</strong>) (<strong>1859-0128</strong>). From 2017, this section became a dependent journal with title <strong>Science and Technology Development Journal</strong> - <strong>Natural Science.&nbsp;</strong>STDJNS is a multiple discipline science journal covering from all fields of natural sciences included mathematics., computer science, chemistry science, physic, biology, environment, information technology...</span></span></p> <p><span id="result_box" class="" lang="en"><span title="Tạp chí Phát triển Khoa học và Công nghệ (PTKH&amp;CN) của Đại học Quốc gia thành phố Hồ Chí Minh (ĐHQG-HCM) được thành lập từ năm 1997, ra số đầu tiên vào tháng 1 năm 1998. Từ năm 2006 Tạp chí đã"><strong>Science and Technology Development Journal</strong> (STDJ), Vietnam National University - Ho Chi Minh City (VNU-HCM) was established in 1997. And the first issue was published in January 1998 with </span><span title="đăng ký mã số chuẩn quốc tế ISSN 1859-0128.">ISSN 1859-0128. </span><span title="Từ đó cho đến nay, Tạp chí PTKH&amp;CN đã trở thành diễn đàn khoa học quan trọng nhất của đội ngũ cán bộ nghiên cứu, giảng viên, nghiên cứu sinh của ĐHQG-HCM và cũng là diễn đàn khoa học công nghệ đáng tin cậy của">Since then, STDJ has become the most important scientific forum of scientists from VNU-HCM as well as</span><span title="nhiều nhà nghiên cứu, giảng viên các trường đại học khác tại Việt Nam."> other universities. </span><span title="Tạp chí đã trải qua 20 năm phát triển và đã trở thành nhịp cầu giao lưu khoa học, cũng như làm phong phú tài liệu tham khảo cho đội ngũ giảng viên, nghiên cứu sinh, sinh viên ĐHQG-HCM nói riêng và các Trường đại">The magazine has undergone 20 years of development and has become a bridge for scientific exchanges, as well as enriching reference materials for the faculty, doctoral students, students of VNU-HCM in particular and other universities, institutes...</span></span></p> <p><span id="result_box" class="" lang="en"><span title="Tạp chí đã được phát hành tại các thư viện của các đơn vị thành viên của ĐHQG-HCM, các Sở Khoa học Công nghệ của các tỉnh thành trên cả nước và được Hội đồng học hàm Giáo sư Nhà nước đánh giá cao.">STDJNS is a multiple discipline science journal covering from all fields of natural sciences included mathematics., computer science, chemistry science, physic, biology, environment, information technology... </span><br></span></p> <p><span class="" lang="en"><span title="• Khoa học Trái đất và Môi trường"><span id="result_box" class="" lang="en">&nbsp;</span></span></span></p> Viet Nam National University Ho Chi Minh City en-US Science and Technology Development Journal - Natural Sciences 2588-106X <p>Copyright The Author(s) 2018. This article is published with open access by Vietnam National University, Ho Chi Minh city, Vietnam. This article is distributed under the terms of the&nbsp;<a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons Attribution License (CC-BY 4.0)</a> which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.&nbsp;</p> Aristolactame and aporphine alkaloid from the ethyl acetate extract of stems Melodorum fruticosum L. http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/1202 <p>Melodorum fruticosum (Annonaceae), a shrub with fragrant yellow flowers, distributed in South East Asia, more specifically indigenous to Thailand, Laos, Cambodia, and Vietnam. In Vietnam, M. fruticosum has been used as folk medicine remedies for the treatment of digestive diseases, abdominal dyspepsia in women after giving birth. This plant has been used as a tonic, a mild cardiac stimulant, antipyretics and as a hematinic to resolve dizziness by Thai people. The essential oil of M. fruticosum flowers is used in aromatherapy and as traditional medicines in Thailand. Its flowers and barks have been reported to have antifungal, antioxidant, and cytotoxic activities. Phytochemical investigation on the fractions EA.3 and EA.4 from the ethyl acetate extract of stem of M. fruticosum led to the isolation of five alkaloids including aristolactame AII (1), goniopedalin (2), piperolactame C (3), 10-amino-3,6-dihydroxy-2,4-dimethoxyphenanthrene-1-carboxylic acid (4) and noraristolodione (5). Their chemical structures were elucidated by 1D and 2D–NMR, ESI-MS as well as compared with data in the literatures. All these compounds were isolated for the first time from the M. fruticosum collected at Di Linh district, Lam Dong province, Vietnam. All isolated were evaluated for their cytotoxicity against KB, Hep-G2, and MCF-7 cell lines. Among them, compound (2) showed weak cytotoxicity against the tested cell lines.</p> Hương Thị Mỹ Nguyễn Liên Thị Mỹ Đỗ ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 2022-07-20 2022-07-20 6 3 press press 10.32508/stdjns.v6i3.1202 title description none g Six flavonoids from the ethyl acetate extract of the pericarp of Garcinia schomburgkiana http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/1200 <p>Garcinia is a genus of Clusiaceae, distributed throughout tropical Asia, Africa, New Caledonia, Polynesia, and Brazil. In traditional medicine, the fruits of Garcinia have been utilized in infusions for treating wounds, ulcers, and dysentery. Extracts of the pericarp and seeds of Garcinia have demonstrated antioxidant, anti-inflammatory, leishmanicidal, and antiprotozoal activities. Garcinia plants contained a broad range of biologically active metabolites which, in the last few decades, have received considerable attention due to the chemical compositions of their extracts, with compounds possessing beneficial effects in several diseases. These species provide a rich natural source of bioactive compounds with relevant therapeutic properties and anti-inflammatory effects, such as flavonoid, xanthone, biflavonoid, biphenyl derivaties, and benzophenone. This paper demonstrated the relevance of the genus as a rich source of compounds with valuable therapeutic properties, with potential use in the prevention and treatment of nontransmissible chronic diseases. Phytochemical investigation on the fraction EA4 from the ethyl acetate extract of the pericarp Garcinia schomburgkianna led to the isolation of six flavonoid compounds such as quercetin (1), kaempferol (2), luteolin (3), cirsiliol (4), quercetin 3-O-β-D-glucopyranoside or isoquercetin (5) and quercetin 3-O-α-L-rhamnopyranoside (6). Their chemical structures were elucidated by 1D, 2D–NMR as well as compared with the literatures. Compounds (1), (3), (4), (5), (6). were isolated for the first time from the species Garcinia schomburgkiana collected at Quang Binh province, Vietnam.</p> Trí Hữu Nguyễn Tuyết Thị Ánh Nguyễn Lien Thi-My Do ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 2022-08-09 2022-08-09 6 3 press press 10.32508/stdjns.v6i3.1200 title description none g Triterpenoids and triterpenoid saponins from leaves of Bougainvillea spectabilis http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/1197 <p>The genus Bougainvillea with about 18 species belonging to the family Nyctaginaceae is a widespread group throughout the world. Bougainvillea spectabilis was traditionally used in Indian and Mexico for treatment hepatitis, cough, and diarrhea. Ethanolic and methanolic extracts from leaves and stems of this plant showed anti–inflammatory activity. Some pharmacological studies have focused on antidiabetic activity of this species. Some extracts from leaves, bark exhibited hypoglycemic, -glucosidase, and amylase inhibitor activities. Phytochemical investigations have reported the isolation of flavonoids, triterpenoid saponins, and steroids. Leaves of B. spectabilis were collected and extracted with ethanol at room temperature by maceration method to obtain the ethanolic extract. By partitioning with n–hexane, ethyl acetate successively yields n–hexane and ethyl acetate extracts. Column chromatographies on normal phase silica gel, reversed–phase RP–18, and Sephadex LH–20 were used to isolate compounds 1–6. Their chemical structures were elucidated by HRESIMS, 1D, and 2D–NMR and compared with those reported in the literature, including lupeol (1), (20S)–3β–acetoxylupan–29–oic acid (2), maslinic acid (3), 3–O––D–(6'–O–methyl)glucuronopyranosyloleanolic acid (4), 3–O––D–(6'–O–ethyl)glucuronopyranosyloleanolic acid (5), and 3–O––D–glucopyranosyl–(14)––D–(6'–O–methyl)glucuronopyranosyloleanolic acid (6). All these compounds were isolated for the first time from the genus Bougainvillea.</p> Nga Thi Vo Lien Thi My Do Quy Bao Pham Tuyet Thi Anh Nguyen ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 2022-08-09 2022-08-09 6 3 press press 10.32508/stdjns.v6i3.1197 title description none g Effects of nitrogen on growth and nitrate accumulation in mustard green (Brassica juncea L. ) in the hydroponic system http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/1170 <p>Nitrate content (NO3-) is one of the important indicators to assess the quality of leafy vegetables. Many studies have shown that vegetables in local markets containing high levels of nitrate that induce harmful effects on human health. In Vietnam, publications on the correlation between NO3-/+NH4 ratio and the nitrate accumulation are limited. Mustard green (Brassica juncea L.) is a popular vegetable and has a high nutrient (rich in fiber and micronutrients). However, the effect of nitrogen on the nitrate accumulation by hydroponic has not been elucidated. In this study, mustard green was grown in four media with different NO3-/+NH4 ratios (2/1; 1.5/1; 3/1, and 4/0) in the hydroponic reflux system. Results showed that the nitrogen requirement of mustard green depended on growth stages. Mustard green needed a low NO3-/+NH4 ratio at the slow growth stage (seedlings) and a high NO3-/+NH4 ratio at the fast one. In addition, the increase of the nitrate content also improved the chlorophyll content in the leaves. The complete removal of +NH4 in the medium stimulated the nitrate accumulation in leaves. The study showed that the suitable hydroponic medium for mustard green was MS medium supplemented with twice KNO3. The KNO3 addition in the hydroponic medium increased the chlorophyll content, the fresh weight, and ensured the content of nitrate (417.59 ± 10.51 mg/kg) within the allowable limits (&lt; 500 mg/kg).</p> Tran Thi Thanh Hien Tran Thanh Thang ##submission.copyrightStatement## http://creativecommons.org/licenses/by/4.0 2022-08-15 2022-08-15 6 3 press press 10.32508/stdjns.v6i3.1170 title description none g