232 research outputs found
TLC determination of triazinic pesticides from soils — A comparative study of some extraction methods
No full textPOLYPHENOLS PROFILE AND ANTIOXIDANT ACTIVITY OF SOME ROMANIAN RANUNCULUS SPECIES
No full textThe Ranunculus species are mostly known for their toxic effect due to the anemonine and protoanemonine content. This paper studies the polyphenols and the antioxidant activity of four different spontaneous species from Ranunculus genus (Ranunculaceae family) harvested from Western Romania’s spontaneous flora. The polyphenols profile was established by TLC and UV-Vis spectrophotometric methods. The antioxidant capacity was evaluated by different in vitro methods: DPPH, TEAC, FRAP, CUPRAC and SNP. From the studied species were prepared two different extracts: hydroalcoholic extracts (HA) respectively glycerol-ethanol extracts (GE). The study indicates that the highest total flavonoid content is in R. ficaria herb HA extract (23 % mg/ml), while the total phenolic acids are the highest in R. bulbosus herb GE extract (14,88 % mg/ml). The most important antioxidant activity was observed at GE extracts obtained from herb of R. ficaria, R. sardous and R. bulbosus. With the less antioxidant effect are the R. sceleratus extracts
Application of HPTLC Multiwavelength Imaging and Color Scale Fingerprinting Approach Combined with Multivariate Chemometric Methods for Medicinal Plant Clustering According to Their Species
No full textIn the current study, multiwavelength detection combined with color scales HPTLC fingerprinting procedure and chemometric approach were applied for direct clustering of a set of medicinal plants with different geographical growing areas. The fingerprints profiles of the hydroalcoholic extracts obtained after single and double development and detection under 254 nm and 365 nm, before and after selective spraying with specific derivatization reagents were evaluated by chemometric approaches. Principal component analysis (PCA) with factor analysis (FA) methods were used to reveal the contribution of red (R), green (G), blue (B) and, respectively, gray (K) color scale fingerprints to HPTLC classification of the analyzed samples. Hierarchical cluster analysis (HCA) was used to classify the medicinal plants based on measure of similarity of color scale fingerprint patterns. The 1-Pearson distance measurement with Ward’s amalgamation procedure proved to be the most convenient approach for the correct clustering of samples. Data from color scale fingerprints obtained for double development procedure and multiple visualization modes combined with appropriate chemometric methods proved to detect the similar medicinal plant extracts even though they are from different geographical regions, have different storage conditions and no specific markers are individually extracted. This approach could be proposed as a promising tool for authentication and identification studies of plant materials based on HPTLC fingerprinting analysis
Superelectrophiles and their chemistry / George A. Olah, Douglas A. Klumpp.
No full textIncludes bibliographical references and index.viii, 301 pages
PRACTICAL INVESTIGATION OF GELS CONTAINING ARISTOLOCHIA (ARISTOLOCHIA CLEMATITIS) EXTRACT
No full textThe aim of this study is to embed the active ingredients of the hydroalcoholic extract from the aristolochia (Aristolochia clematitis) into a new semisolid preparation and a viscoelastic methylcellulose based hydrogel in order to broaden the topical applicability of the palette’s range. The methylcellulose based hydroalcoholic gel formulation, preparation and quality evaluation was realized by continuously measuring the product’s physico-chemical parameters. The evaluated physico-chemical parameters: the swelling degree, the equilibrium swelling degree, the swelling rate and the swelling fraction, the swelling rate parameter, the swelling kinetics order, the speed constant
INVESTIGATION OF THERMAL BEHAVIOR OF NIGELLAE SATIVAE SEMEN FROM DIFFERENT TYPES OF EXTRACTS
No full textThermal methods have an important applicability in the pharmaceutical field, such as raw material control, purity determination, thermal stability determination, substance compatibility, qualitative and quantitative analysis of drugs, etc. Data on substance stability are obtained from the analysis of thermal decomposition determinations that occur both under isothermal conditions and under non-isothermal conditions. Thermogravimetry and derived thermogravimetry (TG / DTG) and differential scanning calorimetry (DSC) that are used to study the compatibility of the active substances and excipients have become increasingly important, because identify possible interactions between these components of the drugs. These thermoanalytic techniques have been used to study the behavior of a Nigella sativa semen glycerin macerate. To obtain tinctures and glycerin macerates, the European Pharmacopoeia methodology was followed. The thermoanalytic curves were recorded in a dynamic atmosphere of nitrogen and air (20 ml / min). The sample heating rate was 10° C / min. Thermal TG / DTG and DSC methods were applied in the temperature range of 25-1000° C
COMPARISON OF DIFFERENT EXTRACTION TECHNIQUES FOR THE EVALUATION OF POLYPHENOLS CONTENT IN SUMMER SAVORY EXTRACTS
No full textEfficiency of conventional solvent extraction (maceration and normal refluxing) and novel extraction techniques (ultrasound-assisted extraction-UAE and microwave-assisted extraction-MAE) were compared in order to obtain an enhanced content of total flavonoid, total phenolic compounds and rosmarinic acid from the Satureja hortensis L. (Summer savory) herb. Different mixtures of ethanol-water ratio were used for extraction of these compounds from dry plant material. High level of total flavonoid content was determined for a solvent system consisted of 40% respectively 50% ethanol (extraction systems ES6 and ES5) while the most efficient techniques were normal refluxing (R) and ultrasound-assisted extraction when sweep mode (UAE1) was selected. For the same solvent systems (ES6 and ES5), a high content of total phenolic compounds was determined when the normal refluxing (R) and microwave-assisted extraction (MAE1, with a duty coefficient of 40% and microwave action time1 min) were used for the extraction procedure. For the rosmarinic acid extraction, the maceration technique (M) combined with an ethanol-water system consisted of 60% ethanol (ES4) was found as the most efficient procedure
OLAH GERAK KAPAL MV. CRYSTAL JADE PADA SAAT PROSES SANDAR DI PELABUHAN ES NAKHODKA RUSSIA
No full textABSTRAKSI
Andjar Nirmala Putra, 2019, NIT:5215614.N, “Olah Gerak MV. Crystal Jade pada Saat Proses Sandar di Pelabuhan Es Nakhodka Russia”, skripsi Program Studi Nautika, Program Diploma IV, Politeknik Ilmu Pelayaran Semarang, Pembimbing I: Capt. H. S. Sumardi,S.H.,MM, M.Mar., Pembimbing II: Irma shinta Dewi, M.Pd.
Pelaksanaan olah gerak kapal sandar secara aman di pelabuhan es, memerlukan pengalaman cukup serta kesigapan guna menghindari keraguan dalam mengambil keputusan dalam melakukan olah gerak kapal. Dengan dasar ini penulis merumuskan masalah penelitian mengapa terjadi keterlambatan proses sandar kapal di pelabuhan es Nakhodka Russia?, Bagaimana cara olah gerak kapal pada saat proses sandar memasuki pelabuhan Nakhodka Russia?. Pengamatan ini dilakukan pada saat praktek laut selama 12 bulan di Mv. Crystal Jade. Adapun metode yang digunakan adalah metode kualitatif, teknik analisis data yang digunakan adalah fishbone, teknik pengumpulan data berupa pendekatan terhadap observasi dan data-data tentang olah gerak kapal sandar.
Berdasarkan hasil pengamatan yang dilakukan penulis selama praktek layar di MV. Crystal Jade mengenai olah gerak kapal di pelabuhan es di Nakhodka, adanya masalah-masalah yaitu kurangnya pengetahuan yang dilakukan kru kapal pada saat berolah gerak di perairan es, tindakan olah gerak menghindari bahaya es yang salah dan kurangnya informasi tentang perairan es dapat menyebabkan keterlambatan pada kapal dalam proses sandar. Pembahasan terhadap hasil pengamatan adalah nahkoda yang memberikan pengenalan tentang cara berolah gerak yang baik pada saat olah gerak di perairan es berdasarkan SOP dari perusahaan, memberikan penegasan kepada deck officer dalam tidak boleh ragu- ragu dalam mengambil keputusan.
Dalam hal ini disimpulkan kurangnya pengetahuan dari awak kapal dalam berolah gerak pada saat olah gerak dan kurangnya informasi wilayah perairan es menyebabkan kapal terlambat sandar dan prosedur sandar kapal di pelabuhan dibagi menjadi tahap persiapan dan tahap pelaksanaan. Adapun saran penulis adalah diadakan pengarahan secara berkala maupun pemahaman terhadap kru tentang prosedur olah gerak kapal di perairan es dan dilakukan safety meeting sebelum kapal melaksanakan olah gerak.
ABSTRACT
Andjar Nirmala Putra, 2019, NIT: 5215614 N, “Ship manouvering in MV Crystal Jade during the berhting process at the ice port in Russia's Nakhodka Port”, Thesis Nautical Study Program, Diploma IV Program, Marchant Marine Polytechnic semarang , Advisor I: Capt. H. S. Sumardi, S.H., MM, M.Mar., Advisor II: Irma shinta Dewi, M.Pd
The implementation of the manouvering of the ship safely in the port of ice, requires sufficient experience and alertness to avoid doubts in making decisions in carrying out the movement of the ship. On this basis the authors formulate a problem about why there is a delay in the process of berthing ships at the Nakhodka Russia ice port?,How is manouvering procedure for berthing at the Nakhodka ice port? . This observation was carried out during 12 months of marine practice in MV. Crystal Jade. The method used is a qualitative method, the data analysis technique used is fishbone, data collection techniques in the form of approaches to observation and data about the movement of the ship.
Based on the results of observations made by the author during the practice of the screen in the MV. Crystal Jade concerning the operation of ships at the ice port in Nakhodka, there are problems such as lack of knowledge carried out by ship crews when working on ice waters, motion actions avoiding the danger of wrong ice and lack of information about ice waters causing delays in the ship in the process of berthing. The discussion of the results of the observation is that the captain provides an introduction to how to perform good manouver when operating in ice waters based on the SOP of the company, giving confirmation to the inner deck officer should not be hesitant in making decisions.
In this case, it was concluded that the lack of knowledge of the crew in moving motion when the movement and lack of information on the ice waters caused the ship to be delayed and procedure for ice berthing devided in to two parts : preparing and actuating. The author’s advice is to hold regular briefings as well as an understanding of the crew about the procedures for ship operations in the ice waters hold a safety meeting before entering port
Phytochemical Analysis of Isoflavons from some Fabaceae Species Extracts
No full textPhytoestrogens are natural compounds synthesized almost exclusively by plants of the Fabaceae family. To find new sources of phytoestrogens, we analyzed the isoflavons from different extracts obtained from plants of the Romanian spontaneous flora belonging to the Fabaceae family: Genistella sagittalis, Genista tinctoria, Cytisus albus, Coronilla varia, Lotus cornyculatus and Dorycnium herbaceum. The qualitative and quantitative analysis were performed by liquid chromatography coupled with mass spectrometry. The hydroalcoholic extracts were obtained by sonication in 10 minutes at 60C. They were analyzed before and after hydrolysis. Some of the studied extracts presented a decreased level of isoflavons: Cytisus albus, Coronilla varia, Lotus cornyculatus and Dorycnium herbaceum. Other extracts were found rich in isoflavons. The high quantities from heterosides (daidzin, genistin, ononin) and aglycons (daidzein, genistein and formononetin) were found in Genistella sagittalis and Genista tinctoria. The results obtained for hydrolyzed extracts are inconclusive
Practical Investigation of Gels Containing Aristolochia (<i>Aristolochia Clematitis</i>) Extract
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