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Pepsin

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https://www.readbyqxmd.com/read/28323499/antiproliferative-activity-of-egg-yolk-peptides-in-human-colon-cancer-cells
#1
Marwa N Yousr, Akram A Aloqbi, Ulfat M Omar, Nazlin K Howell
Egg yolk peptides were successfully prepared from egg yolk protein by-products after lecithin extraction. Defatted egg yolk protein was hydrolyzed with pepsin and pancreatin and purified by gel filtration to produce egg yolk gel filtration fraction (EYGF-33) with antiproliferative activity. The highlight of this study was that the peptide EYGF-33 (1.0 mg/ml) significantly inhibits cell viability of colon cancer cells (Caco-2) with no inhibitory effects on the viability of human colon epithelial normal cells (HCEC) after 48 h...
March 21, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28322047/thiol-ene-monolithic-pepsin-microreactor-with-a-3d-printed-interface-for-efficient-uplc-ms-peptide-mapping-analyses
#2
Alexander Jönsson, Rasmus R Svejdal, Nanna B Bøgelund, Tam T T N Nguyen, Henrik Flindt, Jörg P Kutter, Kasper D Rand, Josiane Penelope Lafleur
To improve the sample handling, and reduce cost and preparation time, of peptide mapping LC-MS workflows in protein analytical research, we here investigate the possibility of replacing conventional enzymatic digestion methods with a polymer microfluidic chip-based enzyme reactor. Off-stoichiometric thiol-ene is utilized as both bulk material and as a monolithic stationary phase for immobilization of the proteolytic enzyme pepsin. The digestion efficiency of the, thiol-ene based, immobilized enzym reactor (IMER) is compared to that of a conventional, agarose packed bed, pepsin IMER column commonly used in LC-MS-based protein analyses...
March 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28319020/in%C3%A2-vitro-preparation-and-assessment-of-radical-reducing-peptide-from-octopus-aegina-using-digestive-proteases
#3
Sekar Sudhakar, Rasool Abdul Nazeer
Antioxidant peptides protect biological macromolecules against radical damages. The use of these peptides was evaluated using free radicals scavenging assays [2,2-diphenyl-1 picrylhydrazyl (DPPH) and hydroxyl] with the help of UV-visible and electron spin resonance (ESR) spectroscopy methods. The Octopus aegina mantle protein were tested upon hydrolysis using gastrointestinal enzymes up to 12 h, where pepsin hydrolysate exhibited superior properties (DPPH: 44.39±0.67% and hydroxyl: 38.84±1.07%) compared with trypsin and α-chymotrypsin...
March 16, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28317757/antihypertensive-peptides-from-animal-products-marine-organisms-and-plants
#4
REVIEW
Seung Yun Lee, Sun Jun Hur
Bioactive peptides from food proteins exert beneficial effects on human health, such as angiotensin-converting enzyme (ACE) inhibition and antihypertensive activity. Several studies have reported that ACE-inhibitory peptides can come from animal products, marine organisms, and plants-derived by hydrolyzing enzymes such as pepsin, chymotrypsin, and trypsin-and microbial enzymes such as alcalase, thermolysin, flavourzyme, and proteinase K. Different ACE-inhibitory effects are closely related with different peptide sequences and molecular weights...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28316472/peptide-analysis-and-the-bioactivity-of-whey-protein-hydrolysates-from-cheese-whey-with-several-enzymes
#5
Renda Kankanamge Chaturika Jeewanthi, Myeong Hee Kim, Na-Kyoung Lee, Yoh Chang Yoon, Hyun-Dong Paik
The aim of this study was identifying a suitable food grade enzymes to hydrolyze whey protein concentrates (WPCs), to give the highest bioactivity. WPCs from ultrafiltration retentate were adjusted to 35% protein (WPC-35) and hydrolyzed by enzymes, alcalase, α-chymotrypsin, pepsin, protease M, protease S, and trypsin at different hydrolysis times (0, 0.5, 1, 2, 3, 4, and 5 h). These 36 types of hydrolysates were analyzed for their prominent peptides β-lactoglobulin (β-Lg) and α-lactalbumin (α-La), to identify the proteolytic activity of each enzyme...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/28315219/assessment-of-ige-reactivity-of-%C3%AE-casein-by-western-blotting-after-digestion-with-simulated-gastric-fluid
#6
Sara Benedé, Rosina López-Fandiño, Elena Molina
Cow's milk allergy is defined as an immunologically mediated adverse reaction to cow's milk proteins and it is usually, along with hen's egg allergy, the first food allergy identified in childhood.One of the main aspects to consider when evaluating the allergenic potential of food proteins is the effect of gastric digestion. It is known that allergens are usually able to survive the harsh acidic environment of the stomach, tolerate the presence of surfactants, and resist digestion by pepsin. They might also be digested into high molecular weight peptide fragments, which retain the same, or sometimes increased, IgE-binding...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28303301/impact-of-tapered-cuff-tracheal-tube-on-microaspiration-of-gastric-contents-in-intubated-critically-ill-patients-a-multicenter-cluster-randomized-cross-over-controlled-trial
#7
Emmanuelle Jaillette, Christophe Girault, Guillaume Brunin, Farid Zerimech, Hélène Behal, Arnaud Chiche, Céline Broucqsault-Dedrie, Cyril Fayolle, Franck Minacori, Isabelle Alves, Stéphanie Barrailler, Julien Labreuche, Laurent Robriquet, Fabienne Tamion, Emmanuel Delaporte, Damien Thellier, Claire Delcourte, Alain Duhamel, Saad Nseir
PURPOSE: Studies on the impact of tapered-cuff tracheal tubes on rates of microaspiration and ventilator-associated pneumonia (VAP) in intubated patients have reported conflicting results. The aim of this study was to determine the influence of this shape of tracheal cuff on abundant microaspiration of gastric contents in critically ill patients. METHODS: All patients intubated in the intensive care unit (ICU) and requiring mechanical ventilation for at least 48 h were eligible for this multicenter cluster-randomized controlled cross-over open-label study...
March 16, 2017: Intensive Care Medicine
https://www.readbyqxmd.com/read/28300572/the-potential-role-of-aspiration-in-the-asthmatic-airway
#8
Eoin B Hunt, Chris Ward, Stephen Power, Ashley Sullivan, Jeffrey Pearson, Susan Lapthorne, Paul M O'Byrne, Joseph Eustace, Barry J Plant, Michael M Maher, John MacSharry, Desmond M Murphy
BACKGROUND: Many asthmatics remain sub-optimally controlled despite current treatments. Reasons include comorbidities that could aggravate asthma, including gastro-esophageal reflux (GER). We aimed to investigate whether aspiration occurs in asthmatic patients and if so does it correlate with asthma control. METHODS: Patients had ACQ-7, FeNO, and spirometry performed to characterize their level of asthma control. Barium swallow with provocation was performed to assess for predisposition to aspiration...
March 11, 2017: Chest
https://www.readbyqxmd.com/read/28299945/in-vitro-and-in-vivo-cholesterol-lowering-ability-of-lactobacillus-pentosus-kf923750
#9
F Bendali, K Kerdouche, S Hamma-Faradji, D Drider
Lactobacillus pentosus KF923750 was characterised for probiotic related properties and then characterised for cholesterol uptake in vitro as well as in vivo using rabbits fed a high-cholesterol diet. The survival percentage of L. pentosus KF923750 was 100% at pH 3, 52.18% at pH 2 and 36.21% at pH 2 plus pepsin. Similarly, this strain appeared resistant to bile (0.1% [98.42%], 0.3% [88.52%], 0.5% [75.60%] and 1% [71.15%]), after 4 h exposure. Moreover, L. pentosus KF923750 controlled growth of Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 25923 through the production of a bacteriocin-like inhibitory substance and anti-adhesive capabilities...
March 16, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/28290301/in-vitro-protein-digestibility-of-pork-products-is-affected-by-the-method-of-processing
#10
Li Li, Yuan Liu, Xiaoyu Zou, Jing He, Xinglian Xu, Guanghong Zhou, Chunbao Li
Processing contributes to different flavors and textures of pork products. However, processing methods have also showed a great impact on meat nutrition. In this study, protein digestibility and digested products were compared among four kinds of processed pork products (cooked pork, emulsion-type sausage, dry-cured pork and stewed pork). Cooked samples were homogenized and digested by pepsin and trypsin. The digestibility of meat proteins was evaluated by particle size measurement, SDS-PAGE, and LC-MS/MS. Emulsion-type sausage had the highest digestibility and the lowest particle size (P<0...
February 2017: Food Research International
https://www.readbyqxmd.com/read/28282970/new-platform-for-simple-and-rapid-protein-based-affinity-reactions
#11
Kei Kubota, Takuya Kubo, Tetsuya Tanigawa, Toyohiro Naito, Koji Otsuka
We developed a spongy-like porous polymer (spongy monolith) consisting of poly(ethylene-co-glycidyl methacrylate) with continuous macropores that allowed efficient in situ reaction between the epoxy groups and proteins of interest. Immobilization of protein A on the spongy monolith enabled high-yield collection of immunoglobulin G (IgG) from cell culture supernatant even at a high flow rate. In addition, immobilization of pepsin on the spongy monolith enabled efficient online digestion at a high flow rate.
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28277888/a-screening-approach-for-identifying-gliadin-neutralizing-antibodies-on-epithelial-intestinal-caco-2-cells
#12
Harald Hundsberger, Anita Koppensteiner, Elisabeth Hofmann, Doris Ripper, Maren Pflüger, Valerie Stadlmann, Christian Theodor Klein, Birgit Kreiseder, Michael Katzlinger, Andreas Eger, Florian Forster, Albert Missbichler, Christoph Wiesner
Celiac disease (CD) is a chronic inflammatory condition caused by the ingestion of gliadin-containing food in genetically susceptible individuals. Undigested peptides of gliadin exert various effects, including increased intestinal permeability and inflammation in the small intestine. Although many therapeutic approaches are in development, a gluten-free diet is the only effective treatment for CD. Affecting at least 1% of the population in industrialized countries, it is important to generate therapeutic options against CD...
March 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28276072/bitterness-in-sodium-caseinate-hydrolysates-role-of-enzyme-preparation-and-degree-of-hydrolysis
#13
Dara O'Sullivan, Alice B Nongonierma, Richard J FitzGerald
BACKGROUND: Enzymatic hydrolysis of sodium caseinate (NaCas) may lead to the development of bitterness. Careful selection of hydrolysis conditions (i.e., enzyme preparation and duration) yielding different degrees of hydrolysis (DH) may aid in the development of low bitterness. RESULTS: Eighteen NaCas hydrolysates were generated with four enzyme preparations (Alcalase 2.4L, Prolyve 1000, FlavorPro Whey and pepsin) to different DH values. Hydrolysate bitterness score, assessed using a trained panel (10 asessors), generally increased at higher DH values for Alcalase, Prolyve and pepsin hydrolysates...
March 8, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28275769/immunomodulatory-effect-of-protease-hydrolysates-from-ovotransferrin
#14
Lin Liu, Mingsheng Xu, Yonggang Tu, Huaying Du, Yulan Zhou, Gaoxiang Zhu
Proteins and bioactive peptides in avian egg white exert diverse biological activities. This study is designed to investigate the effect of protease hydrolysates from ovotransferrin (OVT) on bone marrow-derived dendritic cells (BMDCs) maturation. The results show that OVT-derived pepsin hydrolysate effectively inhibits lipopolysaccharide (LPS)-induced BMDCs maturation by reducing the expression levels of MHC-II, CD83, CD86 and the production of TNF-α, IL-12p70, and RANTES, but increases the production of IL-10...
March 9, 2017: Food & Function
https://www.readbyqxmd.com/read/28274424/influence-of-hydrolysis-behaviour-and-microfluidisation-on-the-functionality-and-structural-properties-of-collagen-hydrolysates
#15
Yehui Zhang, Yousheng Zhang, Xueming Liu, Lihua Huang, Zhiyi Chen, Jingrong Cheng
The functionality and structural properties of pig skin hydrolysates with different degrees of hydrolysis (DH, 10% and 20%) and microfluidisation (120MPa), prepared by pepsin and Alcalase® have been investigated in this study. Extensive hydrolysis can significantly improve the absolute value of the zeta potential and surface hydrophobicity. The particle distribution of hydrolysates decreased with increasing DH. The numbers of free sulfhydryl (SH) and disulfide bonds (SS) were significantly increased with increasing DH (p<0...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28274422/antioxidant-and-functional-properties-of-protein-hydrolysates-obtained-from-squid-pen-chitosan-extraction-effluent
#16
Amin Shavandi, Zhihao Hu, SueSiang Teh, Jenny Zhao, Alan Carne, Adnan Bekhit, Alaa El-Din A Bekhit
Squid pens were subjected to alkali hydrolysis to extract chitin and chitosan. Proteins present in the alkaline extraction wastewater were recovered at pH 3, 4, 5 and 6, and were subjected to hydrolysis by trypsin, pepsin and a bacterial protease called HT for 1, 2, 4 and 24h. Hydrolysis of the extracted proteins with either trypsin or HT generated more antioxidant activity than hydrolysis with pepsin. Higher ACE-inhibitory activity was generated in the trypsin and pepsin hydrolysates than in the HT hydrolysate...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28263835/plant-expressed-hepatitis-b-core-antigen-virus-like-particles-characterization-and-investigation-of-their-stability-in-simulated-and-pig-gastro-intestinal-fluids
#17
Alberto Berardi, George P Lomonossoff, David J Evans, Susan A Barker
Virus-like particles (VLPs) are potential oral vaccine candidates, as their highly compact structure may allow them to withstand the harsh conditions of the gastro-intestinal (GI) environment. Hepatitis B core antigen (HBcAg) is an immunogenic protein that assembles into 30 or 34nm diameter VLPs. Here, the stabilities of both the HBcAg polypeptide itself and the three-dimensional structure of the VLPs upon exposure to in vitro and ex vivo simulated gastric and intestinal fluids were investigated. Plant-expressed HBcAg VLPs were efficiently purified by sucrose density gradient and characterized...
March 2, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28259659/bean-peptides-have-higher-in-silico-binding-affinities-than-ezetimibe-for-the-n-terminal-domain-of-cholesterol-receptor-niemann-pick-c1-like-1
#18
Luis M Real Hernandez, Elvira Gonzalez de Mejia
Niemann-Pick C1 like-1 (NPC1L1) mediates cholesterol absorption at the apical membrane of enterocytes through a yet unknown mechanism. Bean, pea, and lentil proteins are naturally hydrolyzed during digestion to produce peptides. The potential for pulse peptides to have high binding affinities for NPC1L1 has not been determined. In this study , in silico binding affinities and interactions were determined between the N-terminal domain of NPC1L1 and 14 pulse peptides (5≥ amino acids) derived through pepsin-pancreatin digestion...
March 1, 2017: Peptides
https://www.readbyqxmd.com/read/28258530/catesbeianin-1-a-novel-antimicrobial-peptide-isolated-from-the-skin-of-lithobates-catesbeianus-american-bullfrog
#19
Huihui Xu, Yang Zhang, Xin Feng, Kunyuan Tie, Yuan Cao, Wenyu Han
OBJECTIVES: To identify and characterize a novel antimicrobial peptide, catesbeianin-1. RESULTS: Catesbeianin-1 is 25 amino acids long and is α-helical, cationic and amphipathic. It had antimicrobial activity against Gram-positive and Gram-negative bacteria. It was resistant against trypsin and pepsin. Catesbeianin-1 exhibited moderate hemolytic activity (approx 8%) at 100 μg/ml, and its HC50 (50% hemolytic concentration) was 300 μg/ml. Its cytotoxicity was approx 10-20% at 100 μg/ml, and its CC50 (50% cytotoxic concentration) was >100 μg/ml...
March 3, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28254002/probing-deep-into-the-binding-mechanisms-of-folic-acid-with-%C3%AE-amylase-pepsin-and-trypsin-an-experimental-and-computational-study
#20
Weizhong Shi, Yanqing Wang, Hongmei Zhang, Zhengming Liu, Zhenghao Fei
The inhibitions of folic acid (FA) towards three digestive enzymes, including α-amylase, pepsin and trypsin, were examined. The results showed that FA was able to reduce the enzymatic activity of α-amylase, pepsin, and trypsin by the formation of FA-enzyme complexes. The fluorescence spectral data indicated that the binding of FA with α-amylase, pepsin and trypsin resulted in strong fluorescence quenching of Tyr and Trp residues by hydrophobic interactions, hydrogen bonding and electrostatic interactions...
July 1, 2017: Food Chemistry
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