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Search Results: 1 - 10 of 5277 matches for " Stevia Leaf Extract "
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Microencapsulation Stability of Stevia Leaf Extracts of Stevia rebaudiana Bert Using Inulin-Chitosan  [PDF]
Mutmainah Mutmainah, Yohanes Martono, Yuvianti Dwi Franyoto, Lia Kusmita
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105925
Extract of Stevia leaf of rebaudiana Bert has a content that is easily oxidized by the presence of light and heating so it is not stable during storage. A microencapsulation process is carried out which aims to protect the contents in the extract. This study aims to determine the effect of storage temperature on the physical stability of the microencapsulation of Stevia leaf of rebaudiana Bert with a combination of encapsulants inulin chitosan. A study was conducted to determine the effect of temperature on the mi-croencapsulation stability of Stevia leaf of rebaudiana Bert over a period of 1 month. Tests carried out on the microencapsulation of Stevia leaf of re-baudiana Bert include the examination of the physical parameters of the microcapsules, namely the microencapsulation yield, moisture content, sol-ubility, flow rate, non-encapsulated and encapsulated extracts content and determination of particle distribution and morphological form. The test results show that the storage temperature does not affect the microen-capsulation stability of Stevia leaf of rebaudiana Bert, because the SEM test results did not change i.e. the particle size distribution of 1 - 1000 μm. The average yield obtained from making microencapsulation of Stevia leaf extract of rebaudiana Bert was 98.20%. Storage temperatures of 5?C, 25?C and 40?C affect the physical stability of the microencapsulation of Stevia leaf extract of rebaudiana Bert due to changes in the profile of physical characteristics during storage.
Effect of leaf and bark aqueous extract of Anogeissus latifolia on growth performance of Vigna unguiculata  [PDF]
Jahangeer A. Bhat, Munesh Kumar, Bhupendra Singh
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.24055
Abstract: The present study was carried out to assess the effect of leaf and bark aqueous extract of Anogeissus latifolia tree on Vigna unguiculata traditional crop to understand the suitability of treecrop combination in agricultural fields. Different concentrations of leaf (1%, 3% and 5%) and bark (1%, 3% and 5%) aqueous extract of A. latifolia were used to study radicle and plumule growth of Vigna unguiculata. The leaf and bark aqueous extract have shown minimum allelopathic effect on V. unguiculata and suppressed/stimulated radicle and plumule growth under different concentrations. The wide distribution of Anogeissus latifolia in a subtropical region of Garhwal Himalaya, provides good fodder fuel wood and timber to the villagers. Therefore introducing Anogeissus latifolia in agricultural field and maintaining the existed trees at boundaries of agricultural fields can be useful to the villagers requirements for the villages and wherever the possible allopathic effect exit can be minimized by lopping the branches of trees and use of naturally flecked off bark for fuel wood purposes.
Soybean (Glycine Max) Leaf Extract Based Green Synthesis of Palladium Nanoparticles  [PDF]
Ramesh Kumar Petla, Singaravelu Vivekanandhan, Manjusri Misra, Amar Kumar Mohanty, Nallani Satyanarayana
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2012, DOI: 10.4236/jbnb.2012.31003
Abstract: Palladium (Pd) nanoparticles were synthesized using protein rich soybean leaf extract based biological process. Reduction of palladium ions by soybean leaf extract was examined by UV-visible spectroscopic technique. It was believed that the proteins and some of the amino acids that are exist in soybean leaf extracts were actively involved in the reduction of palladium ions. Further it was confirmed by Fourier transformations infrared spectroscopic (FTIR) analysis. These amino acids are not only involving in the reduction of palladium ions but also acting as surfactants that inhibits the rapid agglomeration. The phase purity of the synthesized palladium nanoparticles was investigated through X-Ray Diffraction (XRD) analysis and the obtained pattern was compared with JCPDS data. Transmission electron microscopic (TEM) images of the palladium particles were recorded and the particle size was found to be ~15 nm.
Wound healing potential of aqueous crude extract of Stevia rebaudiana in mice
Kuntal Das
Revista Brasileira de Farmacognosia , 2013,
Abstract: The present study was carried out to evaluate the wound healing potential of crude aqueous extract of Stevia rebaudiana (Bertoni) Bertoni, Asteraceae, in experimental animals. All experiments were conducted following standard procedures. The crude extract was administered topically in graded doses of 150, 250 and 500 mg/kg b.w. was used for evaluating the wound healing potential in excision wound model for fourteen days and orally in the incision wound model for ten days, respectively. Povidone iodine ointment was used as standard (5.0% w/w). Dose dependent activities resulted in both the wound models when compared to the standard (povidone iodine) and the control. Topical application of crude aqueous extract of S. rebaudiana (500 mg/kg b.w) in excision wound model decreased significantly the wound area by 15th day, i.e. 48.2±2.0 compared with control 94.1±1.2. Epithelization time was decreased from 17.3±0.21 to 12.0±0.10 and hydroxylproline content was increased from 32.2±0.11 to 67.6±0.10 when compared with control. In incision wound model breaking strength of wounds, wet and dry granulation of the tissue weight and hydroxyproline were increased significantly from control with AESR. In conclusion, AESR leaves accelerated wound healing activity in mice and thus supports its traditional use.
Ekstrak Daun Beluntas (Pluchea indica Less.) sebagai (Pluchea indica Less.) sebagai Obat Antistres pada Ayam Broiler
D. Setiaji,A. Sudarman
Media Peternakan , 2005,
Abstract: The aim of the study was to find a cheaper alternative antistress for broiler rather than the commercial synthetic one. Ninety DOC strain CP 707 were used in this study which were divided into 18 groups, each consist of 5 chicken and kept in the animal house with a litter system. This study used Completely Randomized Design with six treatments and three replications. The treatments were: 1) drinking water + commercial antistress as positive control, 2) drinking water without extract of beluntas leaf and without commercial antistress as negative control, 3) drinking water + 5% extract of beluntas leaf given continuously, 4) drinking water + 5% extract of beluntas leaf given discontinuously (given only at the time when commercial antistress was given), 5) drinking water + 10% extract of beluntas leaf given continuously, 6) water + 10% extract of beluntas leaf given discontinuously. The results showed that treatments significantly (P<0.05) affected leucocytes number, erythrocytes number, haemoglobin, feed intake, and feed conversion, but did not affect hematocrit value, heterophil/lymphocyte ratio, water intake, and average daily gain. It is concluded that the extract of beluntas leaf can be used as antistress up to 10% of drinking water and is better given discontinuously.
The Allelopathic Effect of Pictacia Leaf Extracts and Pure Essential Oil Components on Pelargonium Ringo Deep Scarlet F1 Hybrid Seed Germination
Yahya BulutSaban Kordali,Omer Atabeyoglu
Journal of Applied Sciences , 2006,
Abstract: The allelopathic effects of leaf extracts obtained from Pictacia vera, Pictacia lentiscus and Pictacia terebinthus and limonene, β-pinene, α-pinene, α-terpinene and terpinen-4-ol, which occur in essential oils of plants, on seed germination at 1000 and 5000 ppm doses were investigated. Among the tested extracts000 ppm doses of chloroform and ethyl alcohol extracts of P. terebinthus increased the seed germination with a rate of 80 and 76.67%. However000 and 5000 ppm doses of terpinen-4-ol had very toxic effect on the seed germination. Both treated doses of this compound completely stopped the seed germination on Pelargonium Ringo Deep Scarlet F1 Hybrid. On the other hand, petroleum ether extract of P. lentiscus treated at 5000 ppm doses increased the seed germination rate.
Leaf Area Distribution Pattern and Non-Destructive Estimation Methods of Leaf Area for Stevia rebaudiana (Bert.) Bertoni
K. Ramesh,Naleeni Ramawat,Virendra Singh
Asian Journal of Plant Sciences , 2007,
Abstract: Leaf area is a valuable index for evaluating growth and development of sweet herb Stevia [Stevia rebaudiana (Bert.) Bertoni]. A simple methodology was developed during 2006 to estimate the leaf area through Leaf Area Distribution Pattern (LADP) and regression equations. Plant height, leaf height as well as the length and breadth of all the measurable leaves were measured and their area was measured through Area meter (AM 300) for a six month old crop of Stevia. A leaf area coefficient of 0.548 was found to fit for the linear equation without intercept. LADP was prepared with relative leaf height and relative leaf area. Based on the adjusted second order polynomial equation of LADP, the relative leaf height of plants representing the mean leaf area was ascertained and a regression equation was obtained to calculate the total leaf area of the plant. The results were validated with 3, 4 and 5 months old crops as well as with another accession. Different combinations of prediction equations were obtained from length and breadth of all leaves and a simplest equation i.e, linear equation was used to predict the leaf area. A non-destructive methodology for estimating leaf area of Stevia based on linear measurement was developed in this study.
Antioxidant and Anti-Tyrosinase Activity from Olea Leaf Extract Depended on Seasonal Variations and Chromagraphy Treatment  [PDF]
Dao-Mao Yang, Ming-An Ouyang
International Journal of Organic Chemistry (IJOC) , 2012, DOI: 10.4236/ijoc.2012.24054
Abstract: In the present study, olive leaf extract, harvested from four seasons, extracted with solvent (methanol and water), was treated by D101 and Sephadex LH-20, and divided into 10 fractions by TLC detection. The antioxidant activity was evaluated using DPPH, superoxide anion scavenging and reducing power assays. Tyrosinase inhibitory activity was also performed with L-DOPA as substrate. On extraction method, there is no significant difference in methanol and water. Among 12 months, autumn showed the best harvest time in whole. OLE showed 90% tyrosinase inhibitory activity and inhibition type was non-competitive competition. By chromagraphy treatment, the ingredients of polysacchmaride and protein showed high bioactivity towards antioxidant and anti-tyrosinase activity, the rest part showed different extent of activity and prove some effect by chromatography treatment indirectly. OLE might be a valuable bioactive source and can be applicable in both the cosmetic and medical use.
Phytochemical Profiling with Antioxidant and Antimicrobial Screening of Amaranthus viridis L. Leaf and Seed Extracts  [PDF]
Saud Asif Ahmed, Sumaira Hanif, Tehreema Iftkhar
Open Journal of Medical Microbiology (OJMM) , 2013, DOI: 10.4236/ojmm.2013.33025
Abstract: Methanol extracts of the dried leaves and seeds of Amaranthus viridis were collected and used for phytochemicals and antibacterial analysis. By detecting the MIC and zone inhibition, the antibacterial activity was determined against different bacterial and fungal strains. The extract yields from the leaves and seeds ranged 5.5-6.1 and 2.42%-3.72% w/w, respectively. Phytochemical investigation of this plant determines that tanins (6.07%-5.96%), saponins (53%-32%), alkaloids (13.14% - 11.42%), protiens (16.76%-24.51%) and glycosides (63.2%-32.3%) were rich in leaves. The extracts also contained appreciable levels of total phenolic contents (2.81-3.61 GAE, g/100 g), total flavanoid contents (18.4-5.42 QE, g/100 g) and DPPH free radical scavenging activity, showing IC50 (83.45-75.95 μg/mL) along with reducing power was calculated. The MIC of extracts ranged 178 - 645 μg/mL. The results of this study suggest the possibility of using the methanolic extracts in treating the diseases caused by the test organisms.

Efficacy of aqueous leaf extracts and synthetic insecticide on pod-sucking bugs infestation of cowpea (Vigna unguiculata (L.) Walp) in the Guinea Sa-vanna Region of Nigeria  [PDF]
Michael M. Degri, Duna M. Mailafiya, Joshua W. Wabekwa
Advances in Entomology (AE) , 2013, DOI: 10.4236/ae.2013.12003
Abstract: Pod-sucking bugs (PSBs) infestation by Ano-plocnemissp./ Riptortussp./Clavigrallasp./Nezaraviridula( Linnaeus) greatly limits cowpea (Vignaunguiculata (L.) Walp) production throughout sub-Saharan Africa. The efficacy of aqueous leaf extracts (ALEs) (5 percent weight/volume concentration) of three botanicals and one synthetic insecticide against PSBs infestation was thus evaluated. The botanicals tested include Aza- dirachtaindicaA. Juss, Chromolaenaodorata (L.) and Ricinuscommunis (L.), whilst the synthetic insecticide was Uppercot 500 EC ( Lambda cyhalothrin 30 g + Dimethoate 250 g ). The effects of these treatments on the number of PSBs/ pods/seeds, pod/seed weight and grain yield were assessed during 2008 and 2009 rainy seasons in Bayo, Borno State, Guinea Savanna region, Nigeria. The number of PSBs was lower on crops treated with Uppercot 500 EC (0.00 - 0.31). This was followed by crops treated with the ALEs ofA.indica/C.odorata (0.31 - 1.33) and R.communis (0.72 - 3.72) than the untreated (3.06 - 5.64) ones.The number of pods/pod weight per plant, seeds/seed weight per pod and total grain yield were generally higher on cowpea crops treated with Uppercot 500 EC (26/17 g, 14/19 g and 1618 kg). This was followed bycrops treated with the ALEs of A.indica/C.odorata (23 - 25/14 - 15 g, 12 - 13/15 g and 1268 - 1310 kg) and R.communis( 21/13 g, 11/14 g and 972 kg) than the untreated (16/9 g, 7/10 g and 312 kg) ones. Although Uppercot 500 EC was most effective inprotecting cowpea against PSBs attack, theALEs of A.indica and C.odorata appreciably protected treated crops against infestation, giving relatively high total grain yield. Both botanical scan thus serve as alternatives to synthetic insecticides for managing PSBs attack on cowpea.

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