scholarly journals Effects of Ethanolic Extract of Kiam Wood/Cashew Bark and Commercial Phenolic Compounds Oxidized Under Alkaline Condition on Gel Property of Gelatin from Cuttlefish Skin

10.4194/afs14 ◽  
2021 ◽  
Vol 01 (01) ◽  
Author(s):  
Wattan Temdee ◽  
Soottawat Benjakul ◽  
Vijay Kumar Reddy Surasani ◽  
Avtar Singh
Keyword(s):  
Phenolic Compounds ◽  
Ethanolic Extract ◽  
Alkaline Condition ◽  
Amino Group ◽  
Gel Properties ◽  
Covalent Bonds ◽  
Group Content ◽  
Lower Solubility ◽  
Amino Group Content ◽  
Ethanolic Extracts

The effect of ethanolic extracts of kiam wood (EKW) or cashew bark (ECB) and commercial phenolic compounds oxidized under alkaline condition (pH 9) on gel properties of gelatin extracted from cuttlefish skin was investigated. All the oxidized compounds increased gel strength (GS) of gelatin, in which the highest value was noticed for gels containing oxidized catechin (CH-G) and gallic acid (GA-G) (P<0.05). Among the ethanolic extracts, the gel added with EKW (EKW-G) had higher GS than that containing ECB gel (ECB-G) (P<0.05). Both extracts yielded gels with similar GS to those added with oxidized ferulic and tannic acids (P>0.05). Lightness and free amino group content of gels were decreased with the addition of oxidized compounds, regardless of their types. Gels added with oxidized compounds showed lower solubility and amino group content as compared to the control, indicating the formation of nondisulphide covalent bonds in the gel matrix. The treated samples showed a gel network with thicker strands and larger voids, compared with the control gel. Overall, oxidized EKW extract had a similar impact on the gel properties of gelatin to the oxidized phenolic compounds, especially catechin and gallic acids.

EFFECTS OF AMINO-GROUP CONTENT AND HYDROPHOBICITY OF CROSS-LINKEDN,N-DIMETHYLAMINOPROPYLACRYLAMIDE ADSORBENTS ON SELECTIVE REMOVAL OF LIPOPOLYSACCHARIDES

2000 ◽  
Vol 23 (12) ◽  
pp. 1887-1902 ◽  
Author(s):  
Masayo Sakata ◽  
Masami Todokoro ◽  
Hideyuki Hata ◽  
Masashi Kunitake ◽  
Kunio Ohkuma ◽  
...  
Keyword(s):  
Selective Removal ◽  
Amino Group ◽  
Group Content ◽  
Amino Group Content

scholarly journals Enhancement of Hydrophobicity of Fish Skin Gelatin via Molecular Modification with Oxidized Linoleic Acid

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Wipawee Theerawitayaart ◽  
Thummanoon Prodpran ◽  
Soottawat Benjakul
Keyword(s):  
Amino Acids ◽  
Linoleic Acid ◽  
Free Amino ◽  
Amino Group ◽  
Fish Gelatin ◽  
Fish Skin ◽  
Molar Ratios ◽  
Group Content ◽  
Amino Group Content ◽  
Fish Skin Gelatin

Fish gelatin possesses hydrophilicity in nature since it contains a few hydrophobic amino acids and a large portion of hydrophilic amino acids. Low hydrophobicity of fish gelatin results in poor water vapor barrier and water resistance of gelatin films. This can limit its usage as packaging material. To overcome this drawback, the molecular attachment of hydrophobic domains can effectively improve the hydrophobicity of fish gelatin. In this study, fish skin gelatin modified with oxidized linoleic acid (OLA) prepared under various conditions using different molar ratios of OLA/free amino group content was characterized. When OLA was prepared at 60 and 80°C for various oxidation times (0–24 h), the peroxide value (PV) increased continuously up to 9 and 12 h when reaction was performed at 80 and 60°C, respectively. Consequently, the PV decreased until the end of the reaction (24 h). Thiobarbituric acid reactive substances (TBARS) of OLA were increased sharply up to 12 h, regardless of reaction temperatures. Thus, primary and secondary lipid oxidation products mainly occurred within the first 12 h. As gelatin was modified with different OLA at various OLA/free amino group molar ratios, the one modified with OLA prepared at 60°C for 24 h at a molar ratio of 10 : 1 had the highest increases in surface hydrophobicity and carbonyl content with the coincidentally lowest free amino group content, compared with control gelatin (without OLA modification). Fourier transforms infrared (FTIR) spectra also reconfirmed the presence of fatty acid covalently attached to resulting gelatin. Therefore, OLA could be used to modify gelatin and increase its hydrophobicity.

Infrared analysis of the amino group content in functional aminopolydimethylsiloxanes

2009 ◽  
Vol 10 (4) ◽  
pp. 437-441 ◽  
Author(s):  
M. C. Gutiérrez ◽  
M. López-Mesas ◽  
M. T. Lacorte ◽  
J. Cegarra
Keyword(s):  
Infrared Analysis ◽  
Amino Group ◽  
Group Content ◽  
Amino Group Content

scholarly journals Anticancer effects of the combined Thai noni juice ethanolic extracts and 5-fluorouracil against cholangiocarcinoma cells in vitro and in vivo

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jeerati Prompipak ◽  
Thanaset Senawong ◽  
Banchob Sripa ◽  
Albert J. Ketterman ◽  
Suppawit Utaiwat ◽  
...  
Keyword(s):  
Nude Mice ◽  
Combination Treatment ◽  
Synergistic Effects ◽  
Single Agent ◽  
Xenograft Model ◽  
Ethanolic Extract ◽  
Model Combination ◽  
Mouse Xenograft Model ◽  
Ethanolic Extracts

AbstractApplication of 5-fluorouracil (5-FU) in cholangiocarcinoma (CCA) is limited by adverse side effects and chemoresistance. Therefore, the combination therapy of 5-FU with other substances, especially natural products may provide a new strategy for CCA treatment. The aim of this study was to evaluate the combination effects of 5-FU and two ethanolic extracts of Thai noni juice (TNJ) products on CCA cell lines and nude mice xenografts. The results of antiproliferative assay showed the combination treatment of 5-FU and each TNJ ethanolic extract exerted more cytotoxicity on CCA cells than either single agent treatment. Synergistic effects of drug combinations can enable the dose reduction of 5-FU. The mechanism underlying a combination treatment was apoptosis induction through an activation of p53 and Bax proteins. In the nude mouse xenograft model, combination treatments of 5-FU with each TNJ ethanolic extract suppressed the growth of CCA cells implanted mice more than single agent treatments with no effects on mouse body weight, kidney, and spleen. Moreover, low doses of TNJ ethanolic extracts reduced the hepatotoxicity of 5-FU in nude mice. Taken together, these data suggested that the ethanolic extracts of TNJ products can enhance the anti-CCA effect and reduce toxicity of 5-FU.

scholarly journals Betel (Piper betle L.) leaf ethanolic extracts dechlorophyllized using different methods: antioxidant and antibacterial activities, and application for shelf-life extension of Nile tilapia (Oreochromis niloticus) fillets

RSC Advances ◽  
2021 ◽  
Vol 11 (29) ◽  
pp. 17630-17641
Author(s):  
Mohamed Tagrida ◽  
Soottawat Benjakul
Keyword(s):  
Shelf Life ◽  
Nile Tilapia ◽  
Ethanolic Extract ◽  
Antibacterial Activities ◽  
Life Extension ◽  
Piper Betle ◽  
Refrigerated Storage ◽  
Betel Leaf ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Ethanolic Extracts

Betel leaf ethanolic extract dechlorophyllized using sedimentation (BLEE-SED) exhibited enhanced antioxidant and antibacterial activities. BLEE-SED could extend the shelf-life of Nile tilapia fillets during refrigerated storage (4 °C) up to 9 days.

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