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Li Z, Tian-Tian L, Aziz T, Min Z, Sarwar A, Zhennai Y, Alharbi M, Alshammari A, Alasmari AF. Purification of Galacto-oligosaccharide (GOS) by fermentation with Kluyveromyces lactis and Interaction between GOS and casein under simulated acidic fermentation conditions. World J Microbiol Biotechnol 2023; 39:342. [PMID: 37828125 DOI: 10.1007/s11274-023-03791-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 10/04/2023] [Indexed: 10/14/2023]
Abstract
In the enzymatic synthesis of galacto-oligosaccharide (GOS), the primary by-products include glucose, galactose and unreacted lactose. This This study was aimed to provide a method to to purify GOS by yeat fermentation and explore the interaction between GOS and CAS with a view for expanding the prospects of GOS application in the food industry. The crude GOS(25.70 g/L) was purified in this study using the fermentation method with Kluyveromyces lactis CICC 1773. Optimal conditions for purification with the yeast were 75 g/L of the yeast inoculation rate and 50 g/L of the initial crude GOS concentration for 12 h of incubation. After removing ethanol produced by yeast by low-temperature distillation, GOS content could reach 90.17%. A study of the interaction between GOS and casein (CAS) in a simulated acidic fermentation system by D-(+)-gluconic acid δ-lactone (GDL) showed that the GOS/CAS complexes with higher GOS concentrations, e.g., 4% and 6% (w/v), was more viscoelastic with higher water-holding capacity, but decreased hardness, elasticity, and cohesiveness at 6% (w/v) of GOS. The addition of GOS to CAS suspension significantly caused (p<0.05) decreased particle sizes of the formed GOS/CAS complexes, and the suspension system became more stable. FT-IR spectra confirmed the existence of different forms of molecular interactions between CAS and GOS, e.g., hydrogen bonding and hydrophobic interaction, and the change of secondary structure after CAS binding to GOS.
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Affiliation(s)
- Zhihui Li
- Key Laboratory of Geriatric Nutrition and Health, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Engineering and Technology Research Center of Food Additives, Ministry of Education, Beijing Technology and Business University, No. 11 Fucheng Road, Hai-Dian District, Beijing, 100048, China
| | - Lai Tian-Tian
- Key Laboratory of Geriatric Nutrition and Health, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Engineering and Technology Research Center of Food Additives, Ministry of Education, Beijing Technology and Business University, No. 11 Fucheng Road, Hai-Dian District, Beijing, 100048, China
| | - Tariq Aziz
- Key Laboratory of Geriatric Nutrition and Health, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Engineering and Technology Research Center of Food Additives, Ministry of Education, Beijing Technology and Business University, No. 11 Fucheng Road, Hai-Dian District, Beijing, 100048, China
- Laboratory of Animal Health, Department of Agriculture, Food Hygiene and Quality, University of Ioannina, Arta, 47132, Greece
| | - Zhang Min
- Key Laboratory of Agro-Products Primary Processing, Academy of Agricultural Planning and Engineering, MARABeijing, 100125, China
| | - Abid Sarwar
- Key Laboratory of Geriatric Nutrition and Health, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Engineering and Technology Research Center of Food Additives, Ministry of Education, Beijing Technology and Business University, No. 11 Fucheng Road, Hai-Dian District, Beijing, 100048, China
| | - Yang Zhennai
- Key Laboratory of Geriatric Nutrition and Health, Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Engineering and Technology Research Center of Food Additives, Ministry of Education, Beijing Technology and Business University, No. 11 Fucheng Road, Hai-Dian District, Beijing, 100048, China.
| | - Metab Alharbi
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Abdulrahman Alshammari
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Abdullah F Alasmari
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
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Lei D, Qin L, Wang M, Li H, Lei Z, Dong N, Liu J. Insights into the Acid-Induced Gelation of Original Pectin from Potato Cell Walls by Gluconic Acid- δ-Lactone. Foods 2023; 12:3427. [PMID: 37761136 PMCID: PMC10529492 DOI: 10.3390/foods12183427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
The acid-induced gelation of pectin in potato cell walls has been gradually recognized to be related to the improvement in the cell wall integrity after heat processing. The aim of this study was to characterize the acid-induced gelation of original pectin from a potato cell wall (OPP). Rheological analyses showed a typical solution-sol-gel transition process of OPP with different additions of gluconic acid-δ-lactone (GDL). The gelation time (Gt) of OPP was significantly shortened from 7424 s to 2286 s. The complex viscosity (η*) of OPP gradually increased after 4000 s when the pH was lower than 3.13 and increased from 0.15 to a range of 0.20~6.3 Pa·s at 9000 s. The increase in shear rate caused a decrease in η, indicating that OPP belongs to a typical non-Newtonian fluid. Furthermore, a decrease in ζ-potential (from -21.5 mV to -11.3 mV) and an increase in particle size distribution (from a nano to micro scale) was observed in OPP after gelation, as well as a more complex (fractal dimension increased from 1.78 to 1.86) and compact (cores observed by cryo-SEM became smaller and denser) structure. The crystallinity of OPP also increased from 8.61% to 26.44%~38.11% with the addition of GDL. The above results call for an investigation of the role of acid-induced OPP gelation on potato cell walls after heat processing.
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Affiliation(s)
- Dandan Lei
- School of Liquor and Food Engineering, Guizhou University, Guiyang 550025, China;
| | - Likang Qin
- School of Liquor and Food Engineering, Guizhou University, Guiyang 550025, China;
| | - Mei Wang
- Institute of Food Processing Technology, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China; (M.W.); (J.L.)
| | - Haoxin Li
- The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, School of Public Health, Guizhou Medical University, Guiyang 550025, China;
| | - Zunguo Lei
- Institute of Food Processing Technology, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China; (M.W.); (J.L.)
| | - Nan Dong
- Guizhou Key Laboratory of Agricultural Biotechnology, Guiyang 550006, China;
| | - Jia Liu
- Institute of Food Processing Technology, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China; (M.W.); (J.L.)
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Hu L, Jia Y, Zhang X, Zhang Y, Dang M, Li C. Application of Persimmon Pectin with Promising Emulsification Properties as an Acidified Milk Drinks Stabilizer. Foods 2023; 12:foods12102042. [PMID: 37238860 DOI: 10.3390/foods12102042] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/29/2023] [Accepted: 05/17/2023] [Indexed: 05/28/2023] Open
Abstract
The present study aimed to evaluate the capability of persimmon pectin (PP) as a stabilizer for acid milk drinks (AMDs) compared with commercial high-methoxyl pectin (HMP) and sugar beet pectin (SBP). The effectiveness of pectin stabilizers was assessed by analyzing particle size, micromorphology, zeta potential, sedimentation fraction, storage, and physical stability. Results of CLSM images and particle size measurements showed that PP-stabilized AMDs had smaller droplet sizes and more uniform distributions, indicating better stabilization potential compared with the HMP- and SBP-stabilized AMDs. Zeta potential measurements revealed that the addition of PP significantly increased the electrostatic repulsion between particles and prevented aggregation. Moreover, based on the results of Turbiscan and storage stability determination, PP exhibited better physical and storage stability compared with HMP and SBP. The combination of steric repulsion and electrostatic repulsion mechanisms exerted a stabilizing effect on the AMDs prepared from PP. Overall, these findings suggest that PP has promising potential as an AMD stabilizer in the food and beverage industry.
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Affiliation(s)
- Lanlan Hu
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Environment Correlative Food Science, Ministry of Education, Wuhan 430070, China
| | - Yangyang Jia
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Environment Correlative Food Science, Ministry of Education, Wuhan 430070, China
- School of Food Science, Henan Institute of Science and Technology, Xinxiang 453003, China
| | - Xiaoxiao Zhang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Environment Correlative Food Science, Ministry of Education, Wuhan 430070, China
| | - Yajie Zhang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Environment Correlative Food Science, Ministry of Education, Wuhan 430070, China
| | - Meizhu Dang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Environment Correlative Food Science, Ministry of Education, Wuhan 430070, China
| | - Chunmei Li
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
- Environment Correlative Food Science, Ministry of Education, Wuhan 430070, China
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Li PW, Ma J, Wei XF, Zhang ZY, Wang RM, Xiao J, Wang JQ. Modification and application of highly active alkaline pectin lyase. AMB Express 2022; 12:130. [PMID: 36210372 PMCID: PMC9548460 DOI: 10.1186/s13568-022-01472-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 09/27/2022] [Indexed: 11/25/2022] Open
Abstract
Alkaline pectate lyase has developmental prospects in the textile, pulp, paper, and food industries. In this study, we selected BacPelA, the pectin lyase with the highest expression activity from Bacillus clausii, modified and expressed in Escherichia coli BL21(DE3). Through fragment replacement, the catalytic activity of the enzyme was significantly improved. The optimum pH and temperature of the modified pectin lyase (PGLA-rep4) were 11.0 and 70 °C, respectively. It also exhibited a superior ability to cleave methylated pectin. The enzyme activity of PGLA-rep4, measured at 235 nm with 0.2% apple pectin as the substrate, was 554.0 U/mL, and the specific enzyme activity after purification using a nickel column was 822.9 U/mg. After approximately 20 ns of molecular dynamics simulation, the structure of the pectin lyase PGLA-rep4 tended to be stable. The root mean square fluctuation (RMSF) values at the key catalytically active site, LYS168, were higher than those of the wildtype PGLA. In addition, PGLA-rep4 was relatively stable in the presence of metal ions. PGLA-rep4 has good enzymatic properties and activities and maintains a high pH and temperature. This study provides a successful strategy for enhancing the catalytic activity of PGLA-rep4, making it the ultimate candidate for degumming and various uses in the pulp, paper, and textile industries.
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