Guabijú (Myrcianthes pungens): Characterization of in natura and lyophilized Brazilian berry

The guabijú (Myrcianthes pungens) is a fruit native from Brazil, characterized by its pleasant sweet flavor, yellow pulp and purple skin in the ripe stage. Its maturation period occurs between december and april in the southern regions of Brazil. The aim of this study was to evaluate the physico-chemical characteristics of guabijú in natura and lyophilized from two different harvest times (December and January). The proximal composition, bioactive profile (anthocyanins, phenolic compounds, and antioxidant activity), mineral profile (Ca, Cu, Fe, Mg, Mn, K, and Zn), and color parameters (L*, a*, and b*) were evaluated. The fruits from January presented a higher content of carbohydrates, reducing sugars, antioxidant potential, and more intense characteristic color, while the fruits from December showed a higher total anthocyanin and mineral content. Moreover, the samples submitted to lyophilization showed good retention of bioactives, highlighting as a suitable method of processing to increase the stability without profound physico-chemical changes. In the colorimetric analysis, the lyophilized samples have a higher intensity of red color, especially in guabijú from January. Both guabijú forms (in natura and lyophilized) from two harvesting times were considered a source of bioactives, with great potential for application in foods.

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Physico-chemical characterization of a spent UO2 fuel with respect to its stability under final disposal conditions

MRS Proceedings ◽

10.1557/opl.2014.656 ◽

2014 ◽

Vol 1665 ◽

pp. 283-289 ◽

Cited By ~ 2

Author(s):

Ernesto González-Robles ◽

Detlef H. Wegen ◽

Elke Bohnert ◽

Dimitrios Papaioannou ◽

Nikolaus Müller ◽

...

Keyword(s):

Spent Nuclear Fuel ◽

Chemical Characterization ◽

Pressurized Water Reactor ◽

Pressurized Water ◽

Final Disposal ◽

Fuel Rod ◽

Physico Chemical ◽

The Stability ◽

Fission Gas Release

ABSTRACTTwo adjacent fuel rod segments were irradiated in a pressurized water reactor achieving an average burn-up of 50.4 GWd/tHM. A physico-chemical characterisation of the high burn-up fuel rod segments was performed, to determine properties relevant to the stability of the spent nuclear fuel under final disposal conditions. No damage of the cladding was observed by means of visual examination and γ-scanning. The maximal oxide layer thickness was 45 µm. The relative fission gas release was determined to be (8.35 ± 0.66) %. Finally, a rim thickness of 83.7 µm and a rim porosity of about 20% were derived from characterisation of the cladded pellets.

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Physico-chemical characterization of the pulp and peel of Brazilian Pitomba (Talisia esculenta (A. St.-Hill.) Radlk)

Research Society and Development ◽

10.33448/rsd-v9i1.1774 ◽

2020 ◽

Vol 9 (1) ◽

pp. e122911774

Author(s):

Layanne Nascimento Fraga ◽

Anne Karoline de Souza Oliveira ◽

Bruna Pinheiro Aragão ◽

Ana Mara de Oliveira e Silva ◽

Elma Regina Silva de Andrade Wartha ◽

...

Keyword(s):

Chemical Composition ◽

Vitamin C ◽

Bioactive Compounds ◽

Mineral Content ◽

Chemical Characterization ◽

The State ◽

High Income ◽

Fresh Sample ◽

Physico Chemical

This study aimed to evaluate the physico-chemical composition and bioactive compounds of pulp and the peel of the pitomba arising from the state of Sergipe/Brazil. The income, the physico-chemical characterization, mineral content, vitamin C and carotenoids of pulp and pitomba peel were determined. The peel presented high income (44,60% of the fruit). A significant amount of vitamin C (20,68 ± 2,93 mg/100g of fresh sample) and carotenoids (43,56 ± 2,04 μg/mL of the extract) were observed in the pulp, while the peel had a high mineral content, mainly potassium (223,00 ± 2,00 mg/100g), calcium (78,90 ± 0,40 mg/100g) and magnesium (47,50 ± 0,90 mg/100g). The constituents’ knowledge of the peel and pulp of the pitomba in natura adds value to the fruit, since it allows a better use of it, considering that the peel is discarded and only its pulp is consumed.

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Preparation and Characterization of Tea Polyphenols/Starch Inclusion Complex

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.432.413 ◽

2013 ◽

Vol 432 ◽

pp. 413-417 ◽

Cited By ~ 6

Author(s):

Li Ming Zhang ◽

Zhi Ying Hu ◽

Li Hu Yan ◽

Run Liu Li ◽

Cheng Wei Cao ◽

...

Keyword(s):

Differential Scanning Calorimetry ◽

Inclusion Complex ◽

Inclusion Complexes ◽

Tea Polyphenols ◽

X Ray Diffraction ◽

Scanning Calorimetry ◽

X Ray ◽

The Stability ◽

Good Retention

In order to improving the stability and bioavailability of tea polyphenols (TP), the TP/starchinclusion complex(TPSIC) was prepared by adding TP to starch slurry during gelatinization, and its TPreleasing behaviorswas investigated. The formation of inclusion complex was confirmed by powder X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The TPSIC showed a characteristic of V-type crystallinity and a looser gel matrix. The encapsulation increased the stability of TP and generated a good releasing behavior after enzymatic erosion. The lower releasing rate indicated that the prepared inclusion complexes had good retention ability and effectively reduced the releasing rate of TP. The releasing rate of TPSIC increased with the increase of TP concentration.

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Purification, characterization and effect of physico-chemical agents on the stability of ?-galactosidase from betel leaves

Journal of Bio-Science ◽

10.3329/jbs.v18i0.8785 ◽

1970 ◽

Vol 18 ◽

pp. 108-115

Author(s):

MS Shovon ◽

SCD Sharma ◽

N Roy

Keyword(s):

Gel Filtration ◽

Deae Cellulose ◽

Piper Betle ◽

Experimental Conditions ◽

Betel Leaf ◽

Sodium Phosphate Buffer ◽

Chemical Agents ◽

Physico Chemical ◽

The Stability

Context: β-galactosidase are present in a wide variety of organisms including plants, animals and microorganisms. Exploration of this enzyme from plant source will help to address the problems faced in the food and allied industries that look for enzymes with novel properties. Objectives: The aim of this study is to explore the purification, characterization and analysis of β-galactosidase from betel leaves. Materials and Methods: Aomal Bangla variety of betel leaf (Piper betle Linn.) was collected from betel vine. The column chromatographic method was done at 4°C using conventional method. The protein concentration was determined by UV-spectrophotometer at 280 nm. The activities of β-galactosidase were done by spectrophotometric method. All other reagents used in the study were of analytical grade. Unless specified, all the experimental conditions are maintained at 4°C. Results: After extraction of β-galactosidase from betel leaves, the crude enzyme was applied to DEAE-cellulose chromatography with sodium phosphate buffer (pH 7.0). The active fraction from DEAE-column chromatography was dialyzed with buffer and applied to CM-cellulose chromatography. The β-galactosidase activity from CM-cellulose chromatography was loaded to Sephadex G-75 Gel filtration chromatography. In this column, the enzyme β-galactosidase was eluted in a single peak. The homogeneity of purity was checked by disc gel electrophoresis and a single band was obtained. The optimum pH of β-GS-I, β-GS-II and β-GS-III were 3.5, 3.8 and 4.2, respectively. The optimum temperatures of the enzymes were 53, 51 and 56°C, respectively. Conclusion: The results obtained in this study suggest that three β-galactosidases namely β-GS-I, β-GS-II and β-GS-III were purified from betel leaves. This is the first report of purification and characterization of β-galactosidase from betel leaves. Keywords: Betel leaves; β-galactosidase; MW; characterisation; stability. DOI: http://dx.doi.org/10.3329/jbs.v18i0.8785 JBS 2010; 18(0): 108-115

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Pembuatan dan Pengujian Stabilitas Bubuk Pewarna Alami dari Daun Bayam Merah (Alternanthera amoena Voss.)

JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI ◽

10.24843/jrma.2020.v08.i03.p10 ◽

2020 ◽

Vol 8 (3) ◽

pp. 409

Author(s):

Niken Ayu Permatasari ◽

Fitri Afifah

Keyword(s):

Citric Acid ◽

Moisture Content ◽

Low Ph ◽

Natural Dye ◽

Total Anthocyanin ◽

Randomized Design ◽

Lower Solubility ◽

Red Color ◽

Two Factors ◽

The Stability

Redleaf amarant (Alternanthera amoena Voss.) is a kind of leaf that used as natural dye because its composition consists anthocyanin which produce red color in low pH condition. The aims of this research was to produce natural dye powder from readleaf amaranth and to test its stabilized during the storage. The experimental design that used Completed Randomized Design (CRD) with two factors were concentration of maltodextrin (15%, 20%, 25%) and the solvent (aquadest, aquadest+HCl 1%, aquadest+ citric acid 5%). The result showed that the best treatment of natural dye powder from redleaf amaranth was found in the addition of maltodextrin concentration of 15% and aquadest+citric acid 5% with resulted in yield of 15,69%, moisture content 4,36%, total anthocyanin 0,587 mg/g substance, 99,00% of solubility, and 0Hue 6,34 (red-purple). The higher concentrations of maltodextrin caused higher yield and solubility that resulted, the lower moisture content and total of anthocyanin, and also paler color that resulted. The testing of the stability of natural dye powder to light, pH, and temperature produces a good stability and a less significant quality reduction until day 10. The longer the storage caused higher moisture content, the lower solubility and total antocyanin, and paler color that resulted. Key words: anthocyanin, maltodextrin, natural dye powder, redleaf amarant

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TEM characterization of Au/Polysilicon interactions

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100176381 ◽

1990 ◽

Vol 48 (4) ◽

pp. 650-651

Author(s):

N. David Theodore ◽

Leslie H. Allen ◽

C. Barry Carter ◽

James W. Mayer

Keyword(s):

Solid Phase ◽

Single Crystal Silicon ◽

Chemical Vapor ◽

Electrical Contacts ◽

Silicon Substrates ◽

Crystal Silicon ◽

Transmission Electron ◽

Polysilicon Films ◽

The Stability

Metal/polysilicon investigations contribute to an understanding of issues relevant to the stability of electrical contacts in semiconductor devices. These investigations also contribute to an understanding of Si lateral solid-phase epitactic growth. Metals such as Au, Al and Ag form eutectics with Si. reactions in these metal/polysilicon systems lead to the formation of large-grain silicon. Of these systems, the Al/polysilicon system has been most extensively studied. In this study, the behavior upon thermal annealing of Au/polysilicon bilayers is investigated using cross-section transmission electron microscopy (XTEM). The unique feature of this system is that silicon grain-growth occurs at particularly low temperatures ∽300°C).Gold/polysilicon bilayers were fabricated on thermally oxidized single-crystal silicon substrates. Lowpressure chemical vapor deposition (LPCVD) at 620°C was used to obtain 100 to 400 nm polysilicon films. The surface of the polysilicon was cleaned with a buffered hydrofluoric acid solution. Gold was then thermally evaporated onto the samples.

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