Modification of fish skin collagen film and absorption property of tannic acid

Abstract

Fish collagen is a biomacromolecule material and is usually used as a clarifying agent. However, fish collagen is not recyclable, and sedimentation usually occurs in the clarification process using fish collagen so that the filtration process is inevitable. This work aimed to provide a recyclable modified fish skin collagen film (MFCF) for adsorption of tannic acids. The collagen from channel catfish skin was extracted and used for preparation of the fish skin collagen film (FCF) and MFCF. The result indicated that the mechanical properties of MFCF were improved by addition of 2 ml/L glycerol, 6 ml/L polyvinyl alcohol (PVA) and 2 ml/L glutaraldehyde in 15 g/L collagen solution. As the most important property of adsorption material, the hydroscopicity of MFCF was only 54%, significantly lower than that of FCF (295%). Therefore, MFCF would not collapse in water. The infrared and thermal properties of MFCF were also investigated in this work. Results indicated that, in comparison to FCF, the physical and chemical properties of MFCF had been improved significantly. MFCF had higher shrink temperature (79.3°C) and it did not collapse in distilled water at normal temperature. Furthermore, absorption and desorption properties of tannic acid were studied. MFCF showed good capability of absorption and desorption of tannic acid, which leaded to the suggestion that MFCF could have potential applications in adsorption material.

Physical crosslinkings of edible collagen casing

“…It is worthy to note that with increasing concerns for food safety, glutaraldehyde is not allowed to use as a processing agent for foods, as authorized by Hygienic Standards for Uses of Food Additives (versions 2760-2011) in China and the petition of glutaraldehyde as crosslinking agent in manufacture of edible collagen sausage casings (GRP 2G0280) is still being held in abeyance by FDA up to November 2014. Thus, the move toward the development of green, and safe crosslinking for the enhanced properties of collagens and collagen based films continues to essentially impact researchers and scientists in food industries [13,14].…”

Extraction of Collagen from By-products, Designed to Increase the Quantity and Quality of Production in Agriculture

“…To cross-link the fish skin collagen extracts, 2 mL/L glycerol and 2 mL/L glutaraldehyde solution was used in concentration of 15 g/L collagen (Liu et al, 2014).…”

“…Studies on improving the mechanical properties of fish skin collagen films (Liu et al, 2014) have led to a reduction of film hygroscopicity from 295% to 54%, an increase in shrinkage temperature of the film (73.9°C) and film stability in distilled water at normal temperature. This paper presents experiments for extracting collagen from fish skin waste, compared with extracting collagen from by-products of bovine leather, tanned or untanned, applying thermal-enzymatic hydrolysis processes, in terms of parameters specific to each type of leather processed.…”

Study of chemical properties and evaluation of collagen in mantle, epidermal connective tissue and tentacle of Indian Squid, Loligo duvauceli Orbigny

“…It is widely distributed in skin, bones, cartilages, tendons, ligaments, blood vessels, teeth, cornea and other organs of vertebrates (Senaratne et al 2006). Collagen finds immense use in all major fields such as, food, pharmaceutical and photographic industries (Liu et al 2011;Regenstein and Zhou 2007). It also plays a noteworthy role in cosmetic, biomedical and leather industry (Kittiphattanabawon et al 2005).…”

“…It also plays a noteworthy role in cosmetic, biomedical and leather industry (Kittiphattanabawon et al 2005). In food industry, it is used as clarifying agent (Liu et al 2011); to develop edible casings for sausages, salami and snack sticks, and gelatine and denatured collagen, as stabilizers and thickeners (Hassan and Mathew 1996). Scientists report that skin collagen from various species such as, brown-banded bamboo shark (Kittiphattanabawon et al 2010); bigeye snapper (Jongjareonrak et al 2005), Nile perch (Muyonga et al 2004), Baltic cod (Sadowska et al 2003) and deep-sea red fish (Wang et al 2007) could be a promising alternative resource for collagen.…”