1
|
Synytsya A, Janstová D, Šmidová M, Synytsya A, Petrtýl J. Evaluation of IR and Raman spectroscopic markers of human collagens: Insides for indicating colorectal carcinogenesis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 296:122664. [PMID: 36996519 DOI: 10.1016/j.saa.2023.122664] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 02/26/2023] [Accepted: 03/21/2023] [Indexed: 06/19/2023]
Abstract
Vibrational spectroscopic methods are widely used in the molecular diagnostics of carcinogenesis. Collagen, a component of connective tissue, plays a special role as a biochemical marker of pathological changes in tissues. The vibrational bands of collagens are very promising to distinguish between normal colon tissue, benign and malignant colon polyps. Differences in these bands indicate changes in the amount, structure, conformation and the ratio between the individual structural forms (subtypes) of this protein. The screening of specific collagen markers of colorectal carcinogenesis was carried out based on the FTIR and Raman (λex 785 nm) spectra of colon tissue samples and purified human collagens. It was found that individual types of human collagens showed significant differences in their vibrational spectra, and specific spectral markers were found for them. These collagen bands were assigned to specific vibrations in the polypeptide backbone, amino acid side chains and carbohydrate moieties. The corresponding spectral regions for colon tissues and colon polyps were investigated for the contribution of collagen vibrations. Mentioned spectral differences in collagen spectroscopic markers could be of interest for early ex vivo diagnosis of colorectal carcinoma if combine vibrational spectroscopy and colonoscopy.
Collapse
Affiliation(s)
- Alla Synytsya
- Department of Analytical Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Daniela Janstová
- Department of Analytical Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Miroslava Šmidová
- Department of Analytical Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Andriy Synytsya
- Department of Carbohydrates and Cereals, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Jaromír Petrtýl
- 4th Internal Clinic-Gastroenterology and Hepatology, 1(st) Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, U Nemocnice 2, 128 00 Prague 2, Czech Republic
| |
Collapse
|
2
|
Kumar Vate N, Pawel Strachowski P, Undeland I, Abdollahi M. Structural and functional properties of collagen isolated from lumpfish and starfish using isoelectric precipitation vs salting out. Food Chem X 2023; 18:100646. [PMID: 37008722 PMCID: PMC10053375 DOI: 10.1016/j.fochx.2023.100646] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 03/10/2023] [Accepted: 03/13/2023] [Indexed: 03/17/2023] Open
Abstract
The possibility of replacing the very time and resource demanding salting out (SO) method with isoelectric precipitation (IP) during collagen extraction from common starfish and lumpfish was investigated. The effect of IP on yield, structural and functional properties of the collagens was therefore compared with SO. Application of IP resulted in a higher or similar collagen mass yield compared with SO from starfish and lumpfish, respectively. However, the purity of collagens recovered with IP was lower than those recovered with SO. Replacing SO with IP did not affect polypeptide pattern and tropohelical structural integrity of collagen from the two resources as revealed with SDS-PAGE and FTIR analysis. Thermal stability and fibril formation capacity of collagens recovered with IP were also well preserved. Overall, the results showed that the IP can be a promising resource smart alternative for the classic SO precipitation during collagen extraction from marine resources.
Collapse
|
3
|
Vate NK, Undeland I, Abdollahi M. Resource efficient collagen extraction from common starfish with the aid of high shear mechanical homogenization and ultrasound. Food Chem 2022; 393:133426. [PMID: 35751213 DOI: 10.1016/j.foodchem.2022.133426] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 05/29/2022] [Accepted: 06/06/2022] [Indexed: 11/04/2022]
Abstract
Processes currently used for collagen extraction are complicated requiring a great deal of time and chemicals. Here, high shear mechanical homogenization (HSMH) and ultrasound (US) were integrated in the pretreatment step of collagen extraction from common starfish to reduce chemical use and time consumption. Effects of the assistant technologies on yield, structural integrity and functionality of collagen were also investigated. HSMH reduced the deproteinization time from 6 h to 5 min and its required amount of alkali 4 times, compared with classic methods. HSMH + US reduced the demineralization time from 24 h to 12 h and improved its efficiency in extraction of minerals. Collagen extraction with HSMH and HSMH + US resulted in similar yield as the classic method and did not affect triple helical structural integrity, polypeptide pattern, thermal stability or fibril-formation capacity of the collagens. Altogether, HSMH and US can effectively improve resource efficiency during collagen extraction without imposing negative effect on collagen quality.
Collapse
Affiliation(s)
- Naveen Kumar Vate
- Department of Biology and Biological Engineering-Food and Nutrition Science, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Ingrid Undeland
- Department of Biology and Biological Engineering-Food and Nutrition Science, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Mehdi Abdollahi
- Department of Biology and Biological Engineering-Food and Nutrition Science, Chalmers University of Technology, 412 96 Gothenburg, Sweden.
| |
Collapse
|
4
|
González-González DC, Rodríguez-Félix DE, García-Sifuentes CO, Castillo-Ortega MM, Encinas-Encinas JC, Santacruz Ortega HDC, Romero-García J. Collagen scaffold derived from tilapia ( Oreochromis niloticus) skin: Obtention, structural and physico-chemical properties. JOURNAL OF AQUATIC FOOD PRODUCT TECHNOLOGY 2022. [DOI: 10.1080/10498850.2022.2048332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
| | | | | | | | | | | | - Jorge Romero-García
- Departamento de Materiales Avanzados, Centro de Investigación en Química Aplicada (CIQA), Saltillo, México
| |
Collapse
|
5
|
Choi D, Heo J, Hong J. Investigation of the Structural Mechanism and Film Growth on Cytoprotective Type I Collagen-Based Nanocoating of Individual Cellular Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:4587-4598. [PMID: 33822629 DOI: 10.1021/acs.langmuir.1c00276] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Cell surface coating using the layer-by-layer assembly (LbL) method has many advantages for biomedical applications. Because the cell surface is a dynamic and highly complex structure, it is hypothesized that LbL multilayer films on cells have characteristics different from those observed in traditional film characterization results. Here, to demonstrate the mechanism of LbL-film formation on cells, LbL films are prepared on HeLa cells using collagen (Col) and hyaluronic acid (HA). The growth behavior of the film and the main driving forces inducing the formation of an LbL film on the cells are investigated. Col self-assembles via electrostatic and hydrophobic interactions; therefore, the Col-based film on the cells grows laterally rather than volumetrically. For the film construction conditions, the ionic density and chain conformation of the polymers change, resulting in mainly hydrophobic interactions. Additional interactions, such as hydrophobic interactions and biological recognition between the substrate and building blocks, also exist and tightly stabilize the films on the cells. The Col/HA film shows an even distribution on the cell surface as the extracellular matrix, and it activates proliferation and the cytoprotective signaling pathway under harsh conditions, resulting in the focal adhesion kinase signaling pathway and low lactate dehydrogenase release. Therefore, information for film construction on cells is beneficial to understand the effectiveness of an LbL film for cells.
Collapse
Affiliation(s)
- Daheui Choi
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Jiwoong Heo
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Jinkee Hong
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Republic of Korea
| |
Collapse
|
6
|
González-Masís J, Cubero-Sesin JM, Guerrero S, González-Camacho S, Corrales-Ureña YR, Redondo-Gómez C, Vega-Baudrit JR, Gonzalez-Paz RJ. Self-assembly study of type I collagen extracted from male Wistar Hannover rat tail tendons. Biomater Res 2020; 24:19. [PMID: 33292808 PMCID: PMC7681980 DOI: 10.1186/s40824-020-00197-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 10/21/2020] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Collagen, the most abundant protein in the animal kingdom, represents a promising biomaterial for regenerative medicine applications due to its structural diversity and self-assembling complexity. Despite collagen's widely known structural and functional features, the thermodynamics behind its fibrillogenic self-assembling process is still to be fully understood. In this work we report on a series of spectroscopic, mechanical, morphological and thermodynamic characterizations of high purity type I collagen (with a D-pattern of 65 nm) extracted from Wistar Hannover rat tail. Our herein reported results can be of help to elucidate differences in self-assembly states of proteins using ITC to improve the design of energy responsive and dynamic materials for applications in tissue engineering and regenerative medicine. METHODS Herein we report the systematic study on the self-assembling fibrillogenesis mechanism of type I collagen, we provide morphological and thermodynamic evidence associated to different self-assembly events using ITC titrations. We provide thorough characterization of the effect of pH, effect of salts and protein conformation on self-assembled collagen samples via several complementary biophysical techniques, including circular dichroism (CD), Fourier Transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), atomic force microscopy (AFM), scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA). RESULTS Emphasis was made on the use of isothermal titration calorimetry (ITC) for the thermodynamic monitoring of fibrillogenesis stages of the protein. An overall self-assembly enthalpy value of 3.27 ± 0.85 J/mol was found. Different stages of the self-assembly mechanism were identified, initial stages take place at pH values lower than the protein isoelectric point (pI), however, higher energy release events were recorded at collagen's pI. Denatured collagen employed as a control exhibited higher energy absorption at its pI, suggesting different energy exchange mechanisms as a consequence of different aggregation routes.
Collapse
Affiliation(s)
- Jeimmy González-Masís
- Escuela de Ciencia e Ingeniería de los Materiales, Instituto Tecnológico de Costa Rica, Cartago, 159-7050, Costa Rica
| | - Jorge M Cubero-Sesin
- Escuela de Ciencia e Ingeniería de los Materiales, Instituto Tecnológico de Costa Rica, Cartago, 159-7050, Costa Rica
| | - Simón Guerrero
- Instituto de Investigación Interdisciplinar en Ciencias Biomedicas SEK (I3CBSEK), Facultad de Ciencias de la Salud, Universidad SEK, Fernando Manterola 0789, 7500000, Santiago, Chile
| | - Sara González-Camacho
- Biological Assays Laboratory (LEBi), Universidad de Costa Rica, San Pedro de Montes de Oca, San José, Costa Rica
| | - Yendry Regina Corrales-Ureña
- National Nanotechnology Laboratory, National Center for High Technology (LANOTEC-CeNAT-CONARE), 1174-1200, Pavas, San José, Costa Rica
| | - Carlos Redondo-Gómez
- National Nanotechnology Laboratory, National Center for High Technology (LANOTEC-CeNAT-CONARE), 1174-1200, Pavas, San José, Costa Rica
| | - José Roberto Vega-Baudrit
- National Nanotechnology Laboratory, National Center for High Technology (LANOTEC-CeNAT-CONARE), 1174-1200, Pavas, San José, Costa Rica
- National University of Costa Rica, UNA, 86-3000, San José, Heredia, Costa Rica
| | - Rodolfo J Gonzalez-Paz
- National Nanotechnology Laboratory, National Center for High Technology (LANOTEC-CeNAT-CONARE), 1174-1200, Pavas, San José, Costa Rica.
| |
Collapse
|
7
|
Proton Conduction via Water Bridges Hydrated in the Collagen Film. J Funct Biomater 2020; 11:jfb11030061. [PMID: 32887392 PMCID: PMC7563757 DOI: 10.3390/jfb11030061] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 08/12/2020] [Accepted: 09/01/2020] [Indexed: 01/16/2023] Open
Abstract
Collagen films with proton conduction are a candidate of next generation of fuel-cell electrolyte. To clarify a relation between proton conductivity and formation of water networks in the collagen film originating from a tilapia’s scale, we systematically measured the ac conductivity, infrared absorption spectrum, and weight change as a function of relative humidity (RH) at room temperature. The integrated absorbance concerning an O–H stretching mode of water molecules increases above 60% RH in accordance with the weight change. The dc conductivity varies in the vicinity of 60 and 83% RH. From those results, we have determined the dc conductivity vs. hydration number (N) per unit (Gly-X-Y). The proton conduction is negligible in the collagen molecule itself, but dominated by the hydration shell, the development of which is characterized with three regions. For 0 < N < 2, the conductivity is extremely small, because the water molecule in the primary hydration shell has a little hydrogen bonded with each other. For 2 < N < 4, a quasi-one-dimensional proton conduction occurs through intra-water bridges in the helix. For 4 < N, the water molecule fills the helix, and inter-water bridges are formed in between the adjacent helices, so that a proton-conducting network is extended three dimensional.
Collapse
|
8
|
Moula Ali AM, Prodpran T, Benjakul S. Effect of squalene as a glycerol substitute on morphological and barrier properties of golden carp (Probarbus Jullieni) skin gelatin film. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2019.105201] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
9
|
Chen J, Li M, Yi R, Bai K, Wang G, Tan R, Sun S, Xu N. Electrodialysis Extraction of Pufferfish Skin ( Takifugu flavidus): A Promising Source of Collagen. Mar Drugs 2019; 17:E25. [PMID: 30621157 PMCID: PMC6356396 DOI: 10.3390/md17010025] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 12/12/2018] [Accepted: 12/27/2018] [Indexed: 01/12/2023] Open
Abstract
Collagen is widely used in drugs, biomaterials, foods, and cosmetics. By-products of the fishing industry are rich sources of collagen, which can be used as an alternative to collagen traditionally harvested from land mammals. However, commercial applications of fish-based collagen are limited by the low efficiency, low productivity, and low sustainability of the extraction process. This study applied a new technique (electrodialysis) for the extraction of Takifugu flavidus skin collagen. We found electrodialysis to have better economic and environmental outcomes than traditional dialysis as it significantly reduced the purification time and wastewater (~95%) while maintaining high extraction yield (67.3 ± 1.3 g/100 g dry weight, p < 0.05). SDS-PAGE, amino acid composition analysis, and spectrophotometric characterization indicated that electrodialysis treatment retained the physicochemical properties of T. flavidus collagen. Heavy metals and tetrodotoxin analyses indicated the safety of T. flavidus collagen. Notably, the collagen had similar thermal stability to calf skin collagen, with the maximum transition temperature and denaturation temperature of 41.8 ± 0.35 and 28.4 ± 2.5 °C, respectively. All evidence suggests that electrodialysis is a promising technique for extracting collagen in the fishing industry and that T. flavidus skin collagen could serve as an alternative source of collagen to meet the increasing demand from consumers.
Collapse
Affiliation(s)
- Junde Chen
- Marine Biological Resource Comprehensive Utilization Engineering Research Center of the State Oceanic Administration, The Third Institute of Oceanography of the State Oceanic Administration, Xiamen 361005, China.
| | - Min Li
- Plants for Human Health Institutes, North Carolina State University, Kannapolis, NC 28081, USA.
| | - Ruizao Yi
- Marine Biological Resource Comprehensive Utilization Engineering Research Center of the State Oceanic Administration, The Third Institute of Oceanography of the State Oceanic Administration, Xiamen 361005, China.
| | - Kaikai Bai
- Marine Biological Resource Comprehensive Utilization Engineering Research Center of the State Oceanic Administration, The Third Institute of Oceanography of the State Oceanic Administration, Xiamen 361005, China.
| | - Guangyu Wang
- Marine Biological Resource Comprehensive Utilization Engineering Research Center of the State Oceanic Administration, The Third Institute of Oceanography of the State Oceanic Administration, Xiamen 361005, China.
| | - Ran Tan
- Marine Biological Resource Comprehensive Utilization Engineering Research Center of the State Oceanic Administration, The Third Institute of Oceanography of the State Oceanic Administration, Xiamen 361005, China.
| | - Shanshan Sun
- Marine Biological Resource Comprehensive Utilization Engineering Research Center of the State Oceanic Administration, The Third Institute of Oceanography of the State Oceanic Administration, Xiamen 361005, China.
| | - Nuohua Xu
- Marine Biological Resource Comprehensive Utilization Engineering Research Center of the State Oceanic Administration, The Third Institute of Oceanography of the State Oceanic Administration, Xiamen 361005, China.
| |
Collapse
|
10
|
Ali AMM, Kishimura H, Benjakul S. Extraction efficiency and characteristics of acid and pepsin soluble collagens from the skin of golden carp (Probarbus Jullieni) as affected by ultrasonication. Process Biochem 2018. [DOI: 10.1016/j.procbio.2018.01.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
11
|
Zhang F, Wang HW, Tominaga K, Hayashi M. Intramolecular vibrations in low-frequency normal modes of amino acids: L-alanine in the neat solid state. J Phys Chem A 2015; 119:3008-22. [PMID: 25723274 DOI: 10.1021/jp512164y] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper presents a theoretical analysis of the low-frequency phonons of L-alanine by using the solid-state density functional theory at the Γ point. We are particularly interested in the intramolecular vibrations accessing low-frequency phonons via harmonic coupling with intermolecular vibrations. A new mode-analysis method is introduced to quantify the vibrational characteristics of such intramolecular vibrations. We find that the torsional motions of COO(-) are involved in low-frequency phonons, although COO(-) is conventionally assumed to undergo localized torsion. We also find the broad distributions of intramolecular vibrations relevant to important functional groups of amino acids, e.g., the COO(-) and NH3(+) torsions, in the low-frequency phonons. The latter finding is illustrated by the concept of frequency distribution of vibrations. These findings may lead to immediate implications in other amino acid systems.
Collapse
Affiliation(s)
- Feng Zhang
- †Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan
| | - Houng-Wei Wang
- ‡Center for Condensed Matter Sciences, National Taiwan University, 1 Roosevelt Road, Section 4, Taipei 10617, Taiwan
| | - Keisuke Tominaga
- †Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan
| | - Michitoshi Hayashi
- ‡Center for Condensed Matter Sciences, National Taiwan University, 1 Roosevelt Road, Section 4, Taipei 10617, Taiwan
| |
Collapse
|
12
|
Use of Ethylenediaminetetraacetic Acid as a Scavenger for Chromium from “Wet Blue” Leather Waste: Thermodynamic and Kinetics Parameters. J CHEM-NY 2014. [DOI: 10.1155/2014/754526] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
One serious consequence of the current consumer society is the transformation of the environment into a waste receptacle arising from human activities. Because of the potential toxic effects of chromium solid waste containing this metal there are grounds for serious concern for the tanning and leather processing industry. The application of tannery waste as organic fertilizer has led to extensive contamination by chromium in agricultural areas and may cause the accumulation of this metal in soils and plants. This work evaluated the extraction of Cr+3and Cr+6contained in solid waste from the leather industry through density functional theory (DFT) calculations. The Gibbs free energy calculations reveal that the chelator ethylenediaminetetraacetic acid (EDTA) forms more stable complexes with metal ions of chromium compared with the structures of the complexes [Cr(NTA)(H2O)2] and [Cr-collagen], the latter used to simulate the protein bound chrome leather.
Collapse
|
13
|
Magazù S, Migliardo F, Parker SF. Vibrational Properties of Bioprotectant Mixtures of Trehalose and Glycerol. J Phys Chem B 2011; 115:11004-9. [DOI: 10.1021/jp205599a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Salvatore Magazù
- Department of Physics, University of Messina, Viale D’Alcontres
31, P.O. Box 55, 98166 Messina, Italy
| | - Federica Migliardo
- Department of Physics, University of Messina, Viale D’Alcontres
31, P.O. Box 55, 98166 Messina, Italy
| | - Stewart F. Parker
- ISIS Facility, Rutherford Appleton Laboratory, Chilton,
Oxon, OX11 0QX United Kingdom
| |
Collapse
|
14
|
Matmaroh K, Benjakul S, Prodpran T, Encarnacion AB, Kishimura H. Characteristics of acid soluble collagen and pepsin soluble collagen from scale of spotted golden goatfish (Parupeneus heptacanthus). Food Chem 2011; 129:1179-86. [PMID: 25212354 DOI: 10.1016/j.foodchem.2011.05.099] [Citation(s) in RCA: 133] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2010] [Revised: 04/01/2011] [Accepted: 05/20/2011] [Indexed: 11/24/2022]
Abstract
Acid soluble collagen (ASC) and pepsin soluble collagen (PSC) were extracted from scale of spotted golden goatfish (Parupeneus heptacanthus) with the yields of 0.46% and 1.20% (based on dry weight basis), respectively. Both ASC and PSC were characterised as type I collagen, containing α1 and α2 chains. β and γ components were also found in both collagens. Based on FTIR spectra, the limited digestion by pepsin did not disrupt the triple helical structure of collagen. ASC and PSC contained glycine (336-340 residues/1000 residues) as the major amino acid and had imino acids of 186-189 residues/1000 residues. Maximal transition temperatures (Tmax) were 41.58 and 41.01°C for ASC and PSC, respectively. From zeta potential analysis, net charge of zero was found at pH 4.96 and 5.39 for ASC and PSC, respectively. Both collagens exhibited high solubility in acidic pH (2-4) and were soluble in the presence of NaCl at concentration up to 20 and 30g/l for ASC and PSC, respectively.
Collapse
Affiliation(s)
- Kanokwan Matmaroh
- Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
| | - Soottawat Benjakul
- Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.
| | - Thummanoon Prodpran
- Department of Material Product Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
| | - Angel B Encarnacion
- Department of Agriculture-Bureau of Fisheries and Aquatic Resources, PCA Bldg. Elliptical Rd., Diliman, Quezon City, Philippines
| | - Hideki Kishimura
- Laboratory of Marine Products and Food Science, Research Faculty of Fisheries Science, Hokkaido University, Hakodate, Hokkaido 041-8611, Japan
| |
Collapse
|