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Monjurul Haq,Truc Cong Ho,Raju Ahmed,Adane Tilahun Getachew,Yeon-Jin Cho,Jin-Seok Park,Byung-Soo Chun 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Bacterial collagenolytic protease-extracted Bigeye tuna skin collagen was subjected to catalysts-assistedsubcritical water hydrolysis. The degree of hydrolysis was the highest for hydrolysates obtained usingsodium bicarbonate catalysts. The color and pH values of the hydrolysates varied depending of thecatalysts used. Four different assays of antioxidant activities varied with respect to the various collagenhydrolysates with hydrolysates obtained using sodium bicarbonate catalysts showing the highestactivity. Ten bacterial species were studied to evaluate antibacterial activity among which nine showedpositive results. The average molecular size of the peptides in the obtained collagen hydrolysates variedbetween 300 and 425 Da. The total amount of structural and total amino acids varied between 116.63 and49.51, and 196.86 and 265.68 mg/100 g hydrolysate, respectively. The collagen hydrolysates obtainedshowed enormous potential to be used in the food and pharmaceutical industries.
Monjurul Haq,GETACHEWADANETILAHUN,PERIASWAMYSIVAGNANAMSARAVANA,조연진,박슬기,김민정,전병수 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8
Supercritical carbon dioxide (SC-CO2) extracted Atlantic salmon frame bone oil (SFBO) was used for Eicosapentaenoic acid and Docosahexaenoic acid (EPA-DHA) concentrate production by urea complexation. Urea/ fatty acids (2.5 to 4.0 w/w), crystallization temperature (−24 to −8 oC) and crystallization time (8 to 24 h) were studied by Box-Behnken Design (BBD) to maximize EPA-DHA content. Highest EPA-DHA content was 60.63% at urea/fatty acids 4.0 w/w, crystallization temperature −15.67 oC and crystallization time 8 h. EPA-DHA concentrate showed improvement of EPA-DHA from 6.39% in SFBO to 62.34%, increase of astaxanthin content from 21.33 μg/g in SFBO to 44.69 μg/g in EPA-DHA concentrate, no residual urea and reduction of many off-flavor compounds. The EPA-DHA yield showed an inverse relation with the urea/fatty acids, whereas its concentration increased proportionally with urea/ fatty acids. Therefore, EPA-DHA concentrate produced from SFBO by urea complexation may be an efficient technique to provide ω-3 polyunsaturated fatty acids to the consumers.
이희정,Monjurul Haq,PERIASWAMYSIVAGNANAMSARAVANA,조영남,전병수 한국생물공학회 2017 Biotechnology and Bioprocess Engineering Vol.22 No.5
The separation of oil by a suitable technique from the Pacific oyster muscle is important for the utilization of the oil as a ω-3 polyunsaturated fatty acids (ω-3 PUFAs) source and production of bio-functional peptides/ oligosaccharides from oil-free residue. This study was conducted to prepare ω-3 PUFAs concentrate from supercritical carbon dioxide (SC-CO2) extracted Pacific oyster oil by enzymecatalyzed ethanolysis reactions. SC-CO2 extractions were done at different temperatures and pressures to optimize suitable extraction conditions and extracted oils were compared with Soxhlet (n-hexane) extracted oil to evaluate the yield and quality. Oil extracted by SC-CO2 at optimized conditions was used for ethanolysis reaction catalyzed by immobilized sn-1,3 specific lipases, namely Novozymes- 435, Lipozyme TLIM, and Lipozyme RMIM to produce 2-monoacylglycerols (2-MAG) rich in ω-3 PUFAs. The optimum temperature and pressure for SC-CO2 extractions of oyster oil was 50°C and 30 MPa. In this condition, the yield of oil was 5.96% and the acid, peroxide, free fatty acid, and p-anisidine values were 4.49 mg KOH/g, 4.72 meq/kg, 3.42%, and 10.03, respectively. The ω-3 PUFAs content significantly increased in 2-MAG obtained from Novozymes 435, Lipozyme TLIM, and Lipozyme RMIM to 43.03 ± 0.36, 45.95 ± 0.29, and 40.50 ± 0.77%, respectively (p < 0.05). A thin layer chromatography (TLC) analysis confirmed the production and separation of 2-MAG in the ethanolysis process. The ratio of total ω-3 to ω-6 fatty acids was almost twice in 2-MAG of SC-CO2 extracted oyster oil. SC-CO2 extracted Pacific oyster oil can be used for sn-1,3 specific lipases catalyzed ethanolysis to produce ω-3 PUFAs rich in 2-MAG.
A. K. M. Asaduzzaman,Monjurul Haq,전병수 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Various catalysts such as formic acid, acetic acid, sodium hydroxide, sodium bicarbonate, carbon dioxide and nitrogen gas were used for hydrolyzates production from deoiled mackerel muscle by subcritical water hydrolysis. Above 99% hydrolysis yield was obtained using sodium bicarbonate catalyst at 260 °C/70 bar. Histamine and heavy metals concentration were reduced in hydrolyzates. Highest amount of amino acid (400.36 mg/g) and reducing sugar (24.75 mg/g) were found in hydrolyzate obtained at 260 °C/70 bar and 220 °C/30 bar, respectively with sodium bicarbonate catalyst. Antioxidant and ACE-inhibitory activities were significantly higher in hydrolyzates obtained using sodium bicarbonate than that of others.