دانلود رایگان مقاله لاتین بیونانوکامپوزیت از سایت الزویر
عنوان فارسی مقاله:
تهیه خواص فیلم خوراکی بیونانوکامپوزیت جدید بر اساس پکتین و نانوسلولز کریستالی
عنوان انگلیسی مقاله:
Preparation and characterization of a novel bionanocomposite edible film based on pectin and crystalline nanocellulose
سال انتشار : 2016
برای دانلود رایگان مقاله بیونانوکامپوزیت اینجا کلیک نمایید.
مقدمه انگلیسی مقاله:
1. Introduction
The known history of carrageenans started when Schmidt (1844) reported the isolation of the mucilage from the red seaweed Chondrus crispus. From that time up to the 1970s it was established that carrageenans have a structure based on a linear chain with a repeating pair of a 3-linked -d-galactopyranosyl residue and a 4-linked -d-galactopyranosyl residue. The last residue occurs frequently as a 3,6-anhydro--d-galactopyranosyl moiety. Carrageenans are substituted with large amounts of sulfate ester groups (Stortz & Cerezo, 2000; Stortz, 2005; Usov, 2011). They differ from agarans, found in other red seaweeds, that have the 4- linked residue belonging to the l-series. A landmark in carrageenan studies was the discovery that, in certain families, different sexual stages produce different carrageenans (Chen, McLachlan, Neish, & Shacklock, 1973; McCandless, Craigie, & Walter, 1973; Pickmere, Parsons, & Bailey, 1973). A new landmark was the finding in the early 1990s, of agarans or agaran/carrageenan hybrids in three carrageenophyte species (Craigie & Rivero-Carro, 1992). Those dl-hybrids, though commonly found within the Cryptonemiales and other non-carrageenophytic taxa, were found for the first time in carrageenan-producing seaweeds (Ciancia & Cerezo, 2010; Stortz, 2005; Usov, 2011). These hybrids were shortly afterwards found in gametophytes (Ciancia, Matulewicz, & Cerezo, 1993; Ciancia, Matulewicz, & Cerezo, 1997; Flores, Cerezo, & Stortz, 2002) and sporophytes (Stortz & Cerezo, 1993; Stortz, Cases, & Cerezo, 1997) of the carrageenophytes Gigartina skottsbergii and Iridaea undulosa, even within their fibrilar cell walls (Flores, Stortz, Rodríguez, & Cerezo, 1997; Flores, Stortz, & Cerezo, 2000). Some l-galactose was also found in the carrageenophytes Rhodophyllis divaricata and Sarcodia montagneana (Chopin, Kerin, & Mazerolle, 1999). The presence of agarans and hybrids was later confirmed in other carrageenophytic seaweeds like Kappaphycus alvarezii (Estevez, Ciancia, & Cerezo, 2000; Estevez, Ciancia, & Cerezo, 2004), Gymnogongrus torulosus (Estevez, Ciancia, & Cerezo, 2001; Estevez, Ciancia, & Cerezo, 2008), Hypnea musciformis (Cosenza, Navarro, Fissore, Rojas, & Stortz, 2014) and Gymnogongrus tenuis (Perez Recalde et al., 2016). It may be asserted that these agarans or hybrids appeared in every carrageenophyte where they were searched for, helped by the availability of new techniques that allow detection of small amounts of l-galactose and its derivatives (Cases, Cerezo & Stortz, 1995; Falshaw & Furneaux, 1995; Navarro & Stortz, 2003). At the same time, several agarophytes were found to produce carrageenans or dl-hybrids (Navarro & Stortz,2003; Takano, Shiomoto, Kamei, Hara, & Hirase, 2003), although none of them were from the main agar-producing orders Gelidiales and Gracillariales (Stortz, 2005; Takano et al., 2003). The proportion of agaran structures within the carrageenophytes was usually low, and required KCl precipitation and/or alkaline treatment to concentrate the l-galactose-rich structures, although an important proportion of agaran diads was found in G. torulosus (Estevez et al., 2008; Usov, 2011). Hypnea musciformis is a widely-distributed red seaweed known to produce large amounts of -carrageenan (Alves et al., 2012). In a previous work (Cosenza et al., 2014) we extracted the polysaccharides from Hypnea musciformis with room temperature- and hot water, and fractionated them with potassium chloride. All the fractions were characterized rheologically and the carrageenan fractions were characterized chemically. In order to acquire a better knowledge ofthe structure of agarans and dl-hybrids presentin carrageenophytes, in the current work we subfractionated the 2 M KCl-soluble fractions (R-2S and H-2S), and to characterize chemically the structures of the isolated subfractions. The discovery of the presence of 3-C-carboxy-d-erythrofuranosyl stubs in signifi- cant amounts is an important outcome of this work.
برای دانلود رایگان مقاله بیونانوکامپوزیت اینجا کلیک نمایید.
کلمات کلیدی:
Preparation and Characterization of Novel Bionanocomposite Based ... ijnrs.damghaniau.ac.ir/article_515688_d8e7240c1286f1500dcc8813df56d6a2.pdf by MM Marvizadeh - 2014 - Cited by 1 - Related articles Preparation and Characterization of Novel Bionanocomposite Based on Tapioca. Starch/Gelatin/Nanorod-rich ZnO: Towards Finding Antimicrobial Coating for. Preparation and characterization of hydroxyapatite reinforced with ... nmj.mums.ac.ir/article_4094_535.html Rating: 1.7 - 1,653 votes Preparation and characterization of hydroxyapatite reinforced with hardystonite as a novel bio-nanocomposite for tissue engineering. Article 6, Volume 2, Issue 2 ... SID.ir | PREPARATION AND CHARACTERIZATION OF NOVEL ... en.journals.sid.ir/ViewPaper.aspx?ID=427372 by MM MARVIZADEH - 2014 - Cited by 1 - Related articles Download Free Full-Text of an article PREPARATION AND CHARACTERIZATION OF NOVEL BIONANOCOMPOSITE BASED ON TAPIOCA ... Synthesis and Characterization of Bionanocomposites with Tunable ... pubs.acs.org/doi/abs/10.1021/bm901186u by P Tingaut - 2009 - Cited by 166 - Related articles Dec 21, 2009 - In the present study, novel bionanocomposite materials with tunable properties were successfully prepared using a poly(lactic acid) (PLA) ... Preparation and characterization of novel PVA bionanocomposites ... www.tandfonline.com/doi/full/10.1080/00914037.2016.1263952 by M Ahmadipour - 2017 Apr 25, 2017 - Also the preparation and characterization of HNCs based on the various metal ... prepared the series of novel bionanocomposites by casting ... Preparation and structural characterization of novel bionanocomposite ... mallakpour.iut.ac.ir/.../preparation-and-structural-characterization-n... - Translate this page Preparation and structural characterization of novel bionanocomposite poly(ester-imide)s containing TiO2 nanoparticles S-valin and L-tyrosine amino acids ...
