Dynamic rheological study of Sterculia striata and karaya polysaccharides in aqueous solution

Brito, Ana Cristina Facundo de; Sierakowski, Maria Rita; Reicher, Fany; Feitosa, Judith P.A.; Paula, Regina C.M. de

doi:10.1016/j.foodhyd.2004.10.035

Cited by 79 publications

(48 citation statements)

References 24 publications

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“…25 Physicochemical properties, as well as the structural, occurrence, production, food, and nonfood applications of GK have been widely studied by different research groups. [26][27][28] GK is a partially acetylated polysaccharide and has a branched structure and high molecular mass of ∼16.0 × 10 9 Da, and is grouped under substituted rhamnogalacturonoglycan (pectic) type tree gums. This gum contains about 60% neutral sugars (rhamnose and galactose) and 40% acidic sugars (glucuronic acid and galacturonic acids).…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Padil¹,

Černík²

2013

IJN

198

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Background:Copper oxide (CuO) nanoparticles have attracted huge attention due to catalytic, electric, optical, photonic, textile, nanofluid, and antibacterial activity depending on the size, shape, and neighboring medium. In the present paper, we synthesized CuO nanoparticles using gum karaya, a natural nontoxic hydrocolloid, by green technology and explored its potential antibacterial application. Methods: The CuO nanoparticles were synthesized by a colloid-thermal synthesis process. The mixture contained various concentrations of CuCl 2 ⋅ 2H 2 O (1 mM, 2 mM, and 3 mM) and gum karaya (10 mg/mL) and was kept at 75°C at 250 rpm for 1 hour in an orbital shaker. The synthesized CuO was purified and dried to obtain different sizes of the CuO nanoparticles. The well diffusion method was used to study the antibacterial activity of the synthesized CuO nanoparticles. The zone of inhibition, minimum inhibitory concentration, and minimum bactericidal concentration were determined by the broth microdilution method recommended by the Clinical and Laboratory Standards Institute. Results: Scanning electron microscopy analysis showed CuO nanoparticles evenly distributed on the surface of the gum matrix. X-ray diffraction of the synthesized nanoparticles indicates the formation of single-phase CuO with a monoclinic structure. The Fourier transform infrared spectroscopy peak at 525 cm −1 should be a stretching of CuO, which matches up to the B 2u mode.The peaks at 525 cm −1 and 580 cm −1 indicated the formation of CuO nanostructure. Transmission electron microscope analyses revealed CuO nanoparticles of 4.8 ± 1.6 nm, 5.5 ± 2.5 nm, and 7.8 ± 2.3 nm sizes were synthesized with various concentrations of CuCl 2 ⋅ 2H 2 O (1 mM, 2 mM, and 3 mM). X-ray photoelectron spectroscopy profiles indicated that the O 1s and Cu 2p peak corresponding to the CuO nanoparticles were observed. The antibacterial activity of the synthesized nanoparticles was tested against Gram-negative and positive cultures. Conclusion:The formed CuO nanoparticles are small in size (4.8 ± 1.6 nm), highly stable, and have significant antibacterial action on both the Gram classes of bacteria compared to larger sizes of synthesized CuO (7.8 ± 2.3 nm) nanoparticles. The smaller size of the CuO nanoparticles (4.8 ± 1.6 nm) was found to be yielding a maximum zone of inhibition compared to the larger size of synthesized CuO nanoparticles (7.8 ± 2.3 nm). The results also indicate that increase in precursor concentration enhances an increase in particle size, as well as the morphology of synthesized CuO nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Padil¹,

Černík²

2013

IJN

198

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“…Furthermore, half of the rhamnose residues of the main chain are 1,4-linked to β-D-galactose units [92,98,99]. The chemical composition of gum samples obtained from different Sterculia species and from different places of origin was found to be quite similar [96,100].…”

Section: Tree Gums -An Overviewmentioning

confidence: 99%

Green Synthesis: Nanoparticles and Nanofibres Based on Tree Gums for Environmental Applications

Padil

Černík

2016

Ecological Chemistry and Engineering S

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Abstract:The recent advances and potential applications of nanoparticles and nanofibres for energy, water, food, biotechnology, the environment, and medicine have immensely conversed. The present review describes a 'green' method for the synthesis and stabilization of nanoparticles and 'green electrospinning' both using tree gums (arabic, tragacanth, karaya and kondagogu). Furthermore, this review focuses on the impending applications of both gum stabilized nanoparticles and functionalized membranes in remediation of toxic metals, radioactive effluents, and the adsorptive removal of nanoparticulates from aqueous environments as well as from industrial effluents. Besides, the antibacterial properties of gum derivatives, gum stabilized nanoparticles, and functionalized electrospun nanofibrous membranes will also be highlighted. The functionalities of nanofibrous membranes that can be enhanced by various plasma treatments (oxygen and methane, respectively) will also be emphasized.

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“…Foram elas: cajueiro (Anacardium occidentale), [104][105][106] angico (Anadenanthera macrocarpa), 107 timbaúba (Enterolobium contortisilliqum), 108 Albizia lebbeck, 109 ciriguela (Spondia purpurea) 110 e chichá (Sterculia striata). 111,112 Todos eles apresentam galactose e acido urônico, embora em teores bem diferentes. A goma do chichá, por exemplo, é a que contém o maior teor de grupamentos ácido (quase 50%) e é, também, a mais viscosa.…”

Section: Polissacarídeo De Exsudatosunclassified

Polissacarídeos da biodiversidade brasileira: uma oportunidade de transformar conhecimento em valor econômico

2009

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Recebido em 21/1/09; aceito em 3/3/09; publicado na web em 17/3/09 POLYSACCHARIDES FROM BRAZILIAN BIODIVERSITY: AN OPPORTUNITY TO CHANGE KNOWLEDGE INTO ECONOMIC VALUE. A brief comment about general characteristics of polysaccharide was presented. Brazilian trade of polysaccharides was obtained from the "Ministério de Desenvolvimento, Indústria e Comércio Exterior" -Brazil. A list of these products was prepared and their price and amount analyzed in the period of 1998-2007. Some chemical properties and application of polysaccharides from our biodiversity was described. In this review they were classified by origin, in vegetal (exudate, seed, fruit, seaweed), animal and bacteria source. There is a trade deficit that can be reverted if part of the accumulated scientific knowledge was used to promote the national economic development in the field.Keywords: polysaccharide; Brazilian biodiversity; economic development. introduçãoBiodiversidade foi definida por Arnt, de uma forma bem criativa, como sendo: 1 "o cofre de um patrimônio químico inexplorado de remédios, alimentos, fertilizantes, pesticidas, cosméticos, solventes, fermentos, têxteis, plásticos, celulose, óleos e energia, além de moléculas, enzimas e genes em número quase infinito."A diversidade contida no cofre é inexata. Estima-se que a diversidade da fauna nacional seja de cerca de 2 milhões de espécies de animais, exceto insetos, representando 14% da biota mundial. Para conhecê-la estima-se que seriam necessários mais dez séculos de trabalho, se o ritmo atual de estudo fosse mantido. 2 Com relação à flora, acredita-se que existam no país cerca de 55 mil espécies vegetais (22% do total mundial), 3 muitas ainda desconhecidas.O valor econômico da nossa diversidade biológica é de difícil mensuração. Uma estimativa é de que seja próximo de 4 trilhões de dólares. 4 Apesar desse elevado "valor econômico", sabe-se que ela por si só não é garantia de crescimento econômico. Transformar biodiversidade em desenvolvimento, através do seu uso sustentado e de seus recursos derivados, é o grande desafio. A etapa inicial para vencer esse desafio é transformar conhecimento em valor econômico e em bem-estar da população, uma das maiores preocupações das sociedades atuais.Diversos produtos utilizados pela sociedade têm como fonte a flora brasileira. Medicamentos, alimentos e seus aditivos, fibras, óleos naturais e essenciais, cosméticos, produtos químicos, biocombustível, são alguns bons exemplos. Inúmeras são as classes de compostos químicos que podem ser extraídos das nossas espécies vegetais. Uma delas é representada pelos polissacarídeos. Pretende-se discorrer sobre o estado atual do conhecimento científico dos polissacarídeos da biodiversidade brasileira, e pontuar o potencial e a necessidade de aplicação industrial. características Gerais de PolissacarídeosPolissacarídeos são polímeros naturais, os quais podem ser constituídos de um único ou de diferentes tipos de monossacarídeos. Celulose, alginato e goma arábica são exemplos de homo-, co-, e hetero-polissacarídeos, r...

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Dynamic rheological study of Sterculia striata and karaya polysaccharides in aqueous solution

Cited by 79 publications

References 24 publications

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Green synthesis of copper oxide nanoparticles using gum karaya as a biotemplate and their antibacterial application

Green Synthesis: Nanoparticles and Nanofibres Based on Tree Gums for Environmental Applications

Polissacarídeos da biodiversidade brasileira: uma oportunidade de transformar conhecimento em valor econômico

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