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  • 1
    Online Resource
    Online Resource
    Four flavonols from the seed of Hibiscus sabdariffa. Linn. growing in Binh Thuan Province
    Viet Nam National University Ho Chi Minh City ; 2019
    In:  Science and Technology Development Journal Vol. 22, No. 4 ( 2019-11-30), p. 348-351
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 22, No. 4 ( 2019-11-30), p. 348-351
    Abstract: Introduction: Hibiscus sabdariffa Linn. (Malvaceae) is a medicinal plant popularly distributed in Asian countries. As of 2019, no chemical investigations from the Vietnamese plant were found. This paper reported the isolation and elucidation of compounds isolated from the seeds of Hibiscus sabdariffa Linn. (Malvaceae) growing in Binh Thuan province. Method: The maceration was applied to the seeds of the plant to afford the crude extract which was then fractionated by liquid-liquid extraction to obtain the ethyl acetate extract. The extract was carried out by using normal phase silica gel column chromatography and thin-layer chromatography. Analysis of spectroscopic data including HR-ESI-MS, 1D and 2D-NMR and a comparison of the NMR data with that in the literature led to the structural elucidation of isolated compounds. Results: Four flavonols comprising quercetin 3-O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (1), quercetin 3-O-β-D-glucopyranoside (2), quercetin (3) and kaempferol (4) were isolated from the ethyl acetate extract. Conclusions: This is the first time the isolated compounds were found from the seeds of this plant.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v22i4.1690
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2019
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  • 2
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    Chemical constituents from leaves of Avicennia lanata non ridley, Phamhoang (Avicenniaceae)
    Viet Nam National University Ho Chi Minh City ; 2013
    In:  Science and Technology Development Journal Vol. 16, No. 2 ( 2013-06-30), p. 20-25
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 16, No. 2 ( 2013-06-30), p. 20-25
    Abstract: Avicennia lanata non Ridley, Phamhoang, Avicenniaceae widely grows in mangrove forests. There were some studies on plants of mangrove forests, and these results showed that they contained many interesting bioactive compounds. Nevertheless, Avicennia lanata has not yet been chemically and biologically studied in Viet Nam. From the hexane extract of the leaves of Avicennia lanata, ursolic acid (1), lupeol (2), betulin (3), sitosterol (4), sitosterol 3–O–β–D–glucopyranoside (5), and tectochrysin (6) were isolated. Their structures were identified by comparing their NMR data as well as physical properties with those in literatures. Further studies on this plant are in progress.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v16i2.1437
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2013
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  • 3
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    Online Resource
    Triterpenoids and coumarins from the leaves of Sterculia foetida Linn.
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science and Technology Development Journal Vol. 23, No. 4 ( 2020-10-25), p. First-
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 23, No. 4 ( 2020-10-25), p. First-
    Abstract: Introduction: Sterculia foetida Linn. is widely distributed in tropical countries. As the continuous study on the hexane and ethyl acetate extracts of Sterculia foetida leaves, the isolation and structural determination of four triterpenoids and two coumarins were addressed. Method: The crude extract was prepared from dried power of Sterculia foetida leaves by maceration method in ethanol. This extract was then separated by liquid-liquid partition with n-hexane, chloroform, and ethyl acetate, respectively, to obtain the corresponding extracts. The hexane and ethyl acetate extracts were applied to multiple silica gel column chromatography to yield six compounds. Their chemical structures were determined by the NMR data analysis as well as the comparison their spectroscopic data and physical properties with those of reported literature. Results: Four triterpenoid compounds, including betulinic acid (1), conyzasaponin G (2), taraxerol (3), and taraxer-14-ene- 1a,3b -diol (4), and two coumarins fraxetin (5), and aesculin (6) were identified. Conclusion: To the best of our knowledge, they have not been reported in the leaves of Sterculia foetida before, and compound 2 was known to present in Sterculia genus for the first time.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v23i4.2449
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 4
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    Petrographical, petrochemical characteristics of Ta Kou massif granitoids, Ham Thuan Nam, Binh Thuan
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science and Technology Development Journal - Natural Sciences Vol. 4, No. 1 ( 2020-04-04), p. First-
    Details
    In: Science and Technology Development Journal - Natural Sciences, Viet Nam National University Ho Chi Minh City, Vol. 4, No. 1 ( 2020-04-04), p. First-
    Abstract: Ta Kou is an isometric shape with an area of ​​about 15 km2. Petrographical composition is mainly biotite-hornblende granodiorite; minors are altered light-colored fine-grained biotite granite. Mineral composition is mainly plagioclase 45–50, quartz 25, potassium feldspar 15–20, biotite 5–10, hornblende (5–7); secondary is pyroxen; Accessory minerals include zircon, apatite, orthit, muscovite and rare ore. In some places, near fault or high arch of massif, rocks have been altered by other magma, especially near faults due to post-magma activity including fine-grained biotite granite which caused strongly by alkalization such as increasing the content of potassium felspar (35–50%) and quartz 30; reducing plagioclase content (30–25%); amphibole -colored minerals is rare, and pyroxene is absent. Chemical composition of medium acid granodiorite SiO2 61.08–62.14 (61.85); total alkalinity (K2O+Na2O) 5,99–6,04 (6.00); ratio of alkaline K2O/Na2O: 0.74-0.77 (0.75 〈 1). Characterized trace elements content of granodiorite: Rb and Ba are low but Sr is quite high; ratios Rb/Sr: 0.24; Ba/Sr 1.40, Ba/Rb: 5.85; K/Rb: 245.39; La/Yb: 10.33; Ce/Yb: 22.11; normal Eu anomalies. When influencing the post-magmatic activity, some granite is more acidific, the chemical composition of altered granite SiO2 72.27–74.07 (73.17); total alkalinity (K2O+Na2O): 7.48–7.96 (7.72); the ratio of alkaline  K2O/Na2O: 1.60–1.69 (1.64 〉 1). Characterized trace elements content of altered granite: Ba and Sr are low but high Rb; ratios of Rb/Sr: 1.43; Ba/Sr: 3.06, Ba/Rb: 2.79; K/Rb: 218.05; La/Yb: 8.60 and Ce/Yb: 15.74; strong Eu anomalies.Ta Kou granitoids belong to the medium to high aluminum series, medium to high potassium alkaline series, negative Eu anomalies are from normal to strong, type of I- granite. Granitoid characterized subduction-related formation and altered, which may be due to the effects of later phase magmatic activity. Compared with granitoid formations in South Vietnam, Ta Kou massif granitoids belong to phase 2 of Định Quán complex.  
    Type of Medium: Online Resource
    ISSN: 2588-106X , 2588-106X
    URL: Article
    DOI: 10.32508/stdjns.v4i1.597
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 5
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    Online Resource
    CHEMICAL CONSTITUENTS FROM LEAVES OF SONNERATIA ALBA J.E. SMITH (SONNERATIACEAE)
    Viet Nam National University Ho Chi Minh City ; 2011
    In:  Science and Technology Development Journal Vol. 14, No. 4 ( 2011-12-30), p. 11-17
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 14, No. 4 ( 2011-12-30), p. 11-17
    Abstract: Sonneratia alba J.E. Smith, Sonneratiaceae widely grows in mangrove forests. There were some studies on plants of mangrove forests, and these results showed they contained many interesting bioactive compounds. Nevertheless, Sonneratia alba has not much been studied, especially, has not yet been chemically and biologically studied in Viet Nam. From the petroleum ether extract of the leaves of Sonnertia alba, oleanolic acid (1), betulin (2), betulinic acid (3), alphitolic acid (4), methyl gallate (5) and 5-hydroxymethylfurfural (6) were isolated. Their structures were identified by comparing their NMR data as well as the physical properties with those in literatures. Among them, (1) had high yield (about 0.15% of dried leave) with numerous pharmacological activities including inhibitory activity against HIV-1 protease with IC50 of 6.3 mM, anti-inflammatory, anti-cancer. So, Sonneratia alba should be exploited to afford to a valuable source in food and pharmaceutical products. Further studies on this plant are in progress.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v14i4.2043
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2011
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  • 6
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    Online Resource
    OLEANANE SAPONINS FROM POLYSCIAS GUILFOYLEI BAIL. (ARALIACEAE)
    Viet Nam National University Ho Chi Minh City ; 2009
    In:  Science and Technology Development Journal Vol. 12, No. 10 ( 2009-05-28), p. 21-28
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 12, No. 10 ( 2009-05-28), p. 21-28
    Abstract: Polyscias guilfoylei Bail has just studied by our group. From leaves of this plant, four compounds had been isolated: isophytol, oleanolic acid, 3-0-B-D glucopyranosylspinasterol and 3-0-B-D-glucopyranosyloleanolic acid [5]. Now we presented five saponins isolated from leaves of this plant: B-D-glucuronopyranosyloleanolic acid (1), a mixture of two saponins of 3-0-B-D-glucopyranosyl-(1→3)-B-D-glucuronopyranosyloleanolic acid (2a) and 3-0-B-D-glucopyranosyl-(1→4)-B-D-glucurono-pyranosyloleanolic acid (2b) with the ratio of (2:3), 3-0-B-D-glucopyranosyl-(1→3)-[B-D-gluco-pyranosyl-(1→4)3-B-D glucuronopyranosyloleanolic acid (3), 3-0-B-D-glucopyranosyl-(1→2)-(B-D-glucopyranosyl (1→4 )] -B-D-glucuronopyranosyloleanolic acid (4) and 3-0-B-D-glucopyranosyl-( 1→4)-B-D- glucuronopyranosyloleanolic acid 28-0-B-D-glucopyranosyl ester (5). Their chemical structures were established by spectroscopic analysis.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v12i10.2295
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2009
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  • 7
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    SOME COMPOUNDS FROM FLOWER OF WEDELIA TRILOBATA (L.) HITCH. (ASTERACEAE)
    Viet Nam National University Ho Chi Minh City ; 2011
    In:  Science and Technology Development Journal Vol. 14, No. 2 ( 2011-06-30), p. 20-27
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 14, No. 2 ( 2011-06-30), p. 20-27
    Abstract: Wedelia trilobata Hitch. has not much been chemically and biologically studied. From the flower of Wedelia trilobata, ten compounds were isolated: friedelan-3β-ol (or epifriedelanol) (1), erythrodiol (2), 28-hydroxy-3β -tetradecanoyloxyolean-12-ene (or 3β -tetradecanoyloxyerythrodiol) (3), 3β-henicosanoyloxyolean-12-en-28-oic acid (4), 3β-pentadecanoyloxyolean-28(13)-lactone (5), kaura-9(11),16-dien-18-oic acid (or grandiflorenic acid) (6), 2-(3-hydroxy-3,7,11,15- tetramethylhexadecyl)-3,5,6-trimethyl-1,4-dihydroxybenzene (or tocopherolhydroquinone) (7), gramisterol (8), stigmasterol (9) and b-sitosterol 3-O-b-D-glucopyranoside (10). The structures of these compounds were determined through the interpretation of their NMR data and compared with references.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v14i2.1939
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2011
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  • 8
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    Use of compost as biological filter to remove gaseous hydrogen sulfide
    Nguyen, Le Lien Thi ; Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Vietnam ; Nguyen, Duy ; [et al.]
    Viet Nam National University Ho Chi Minh City ; 2021
    In:  Science & Technology Development Journal - Engineering and Technology ( 2021)
    Details
    In: Science & Technology Development Journal - Engineering and Technology, Viet Nam National University Ho Chi Minh City, ( 2021)
    Abstract: Odor pollution is very popular in developing countries. Odors can arise from many different sources, cause discomfort to expose, and also have certain effects on health. Odors can come from the anaerobic digestion of waste, from a factory's wastewater treatment system, or from manufacturing operations in industries such as seafood processing or animal feed production, tanning, and rubber processing. The composition of the odor is often diverse with many gases, mainly in low concentrations. Because it is gaseous pollution, the odor has the risk of spreading widely, the collection must be carried out in a wide range, the flow of gas to be treated is often large. In this study, one of the basic components of odors, H2S, was of interest to be treated because of its prevalence and toxic nature. Currently, although there are many technologies to handle H2S, the application in odor treatment still has many shortcomings. The current technologies such as adsorption and absorption are not suitable for the removal of H2S in odor because of the low efficiency but high cost. In this study, a cheap and available commercial compost fertilizer was used for the removal of gaseous H2S in a lab-scale biofilter. Results showed that microorganisms had an avital role in H2S removal. The factors affecting the biological removal of H2S were determined to be relative humidity (RH), operation time, presence of mixing/turning, and height of compost column. The high H2S removal efficiency of 94.2% was obtained at RH of 50% and compost height of 400 mm, which is suggested for full-scale biofilter design. Under turning condition of once per two days for compost column, the biofilter system was stable at removal efficiency of over 80% during at least 12 days of operation.
    Type of Medium: Online Resource
    ISSN: 2615-9872
    URL: Article
    DOI: 10.32508/stdjet.v4iSI1.910
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2021
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  • 9
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    Online Resource
    Isolation of dihydroxyacetone-producing acetic acid bacteria in Vietnam
    Viet Nam National University Ho Chi Minh City ; 2016
    In:  Science and Technology Development Journal Vol. 19, No. 4 ( 2016-12-31), p. 31-38
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 19, No. 4 ( 2016-12-31), p. 31-38
    Abstract: Sixty-six acetic acid bacteria (AAB) were isolated from fourty-five flowers and fruits collected in Hochiminh City, Vietnam. Of the sixty-six, thirty-one isolates were selected as dihydroxyacetone (DHA)-producing AAB based on the reaction with Fehling’s solution and grouped into three groups by routine identification with phenotypic features. Group I composed of fourteen isolates and was assigned to the genus Acetobacter, Group II composed of thirteen isolates and was assigned to the genus Gluconobacter and Group III was the remaining four isolates and was assigned to the genus Gluconacetobacter. Ten isolates among the thirteen isolates of Group II gave a larger amount of DHA (22.2–26.0 mg/mL) than Gluconobacter oxydans NBRC 14819T (19.8 mg/mL), promising for the potential use in producing DHA. In phylogenetic analysis based on 16S rRNA gene sequences, six isolates of the ten potential DHA producers were suggested to be candidates for new taxa in the genus Gluconobacter.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v19i4.625
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2016
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  • 10
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    Online Resource
    PHOTOCATALYTIC TIO THIN FILMS FABRICATED BY DC REACTIVE MAGNETRON SPUTTERING
    Viet Nam National University Ho Chi Minh City ; 2009
    In:  Science and Technology Development Journal Vol. 16, No. 3 ( 2009-02-15), p. 16-23
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 16, No. 3 ( 2009-02-15), p. 16-23
    Abstract: Titanium dioxide thin films that were deposited by unbalanced DC reactive magnetron sputtering on glass substrates have a high crystal structure and large surfac especially getting the anatase phase at the fairly low temperature substrates T, = 446K . The films were charaterized by X-ray diffraction, attomic force AFM, UV-vis spectroscopy. The photocatalytic properties of TiO2 thin films were tested with the degradation methylene blue MB under UV light irradiation. The best fabricated photocatalytic TiOthin films were found with such parameters: gas ratio 0 Ar = 0,06; sputtering power P, = 275W (1p = 0,5 A; Vp = 550V); target - substrate distance h = 4cm; pressure p = 13 mtorr, film thickness d = 660 nm and substrate temperature Tg = 485 K. These films also have a reused probability several times without decreasing amount of Methylene Blue (MB) degradation.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v16i3.2215
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2009
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