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https://www.readbyqxmd.com/read/28152036/bioactivity-of-a-modified-human-glucagon-like-peptide-1
#1
Fangfang Xu, Kevin Yueju Wang, Nan Wang, Gangqiang Li, Dehu Liu
Diabetes has become the third largest cause of death in humans worldwide. Therefore, effective treatment for this disease remains a critical issue. Glucagon-like peptide-1 (GLP-1) plays an important role in glucose homeostasis, and therefore represents a promising candidate to use for the treatment of diabetes. Native GLP-1, however, is quickly degraded in in the circulatory system; which limits its clinical application. In the present study, a chemically-synthesized, modified analogue of human GLP-1 (mGLP-1) was designed...
2017: PloS One
https://www.readbyqxmd.com/read/28114854/gastrointestinal-stability-of-dihydromyricetin-myricetin-and-myricitrin-an-in-vitro-investigation
#2
Dong Xiang, Chen-Guang Wang, Wen-Qing Wang, Chun-Yang Shi, Wei Xiong, Meng-Die Wang, Jian-Guo Fang
The gastrointestinal (GI) stability of three flavonoids, dihydromyricetin (DMY), myricetin (MYR), and myricitrin (MYT), was examined in simulated physiological fluids. Several factors that may influence the degradation rate of theses flavonoids were evaluated, including pH and the presence of pepsin and pancreatin enzymes. We found that GI stability followed the order of MYT > DMY > MYR. These flavonoids were stable in simulated gastric fluids and buffer solutions (pH 1.2), but encountered a pseudo-first-order kinetic degradation in simulated intestinal fluids and buffer solutions (pH 6...
January 23, 2017: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/28049799/pancreatin-trypsin-solution
#3
(no author information available yet)
No abstract text is available yet for this article.
January 3, 2017: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/27988123/short-communication-inhibition-of-angiotensin-1-converting-enzyme-by-peptides-derived-from-variants-of-bovine-%C3%AE-casein-upon-apical-exposure-to-a-caco-2-cell-monolayer
#4
Bjørn Petrat-Melin, Thao T Le, Hanne S Møller, Lotte B Larsen, Jette F Young
This study investigated the consequence of genetically contingent amino acid substitutions in bovine β-casein (CN) genetic variants A(1), A(2), B, and I on the structure and bioactive potential of peptides following in vitro digestion. The β-CN variants were digested in vitro using pepsin and pancreatin, and a peptide profile was obtained by liquid chromatography tandem mass spectrometry, revealing among others, the β-casomorphin precursor peptides VYPFPGPIHN and VYPFPGPIPN, derived from variant A(1)/B and from A(2)/I, respectively...
February 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/27977191/hydrolysis-of-dicaffeoylquinic-acids-from-ilex-kudingcha-happens-in-the-colon-by-intestinal-microbiota
#5
Minhao Xie, Guijie Chen, Bing Hu, Li Zhou, Shiyi Ou, Xiaoxiong Zeng, Yi Sun
Monocaffeoylquinic acids (mono-CQAs) can be hydrolyzed or metabolized by pancreatin, intestinal brush border esterase, and microbiota in the colon. Data about the conversion of dicaffeoylquinic acids (diCQAs) in digestion are scarce. The diCQA-rich fraction including 3,4-, 3,5-, and 4,5-diCQAs was prepared from Ilex kudingcha, and the conversion in simulated gastricintestine was investigated. Artificial saliva, gastric and pancreatic fluids, Caco-2 monolayer cells, and anaerobic fermentation model were utilized to mimic digestions of the oral cavity, stomach, small intestine, and colon in vitro...
December 28, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27951472/soy-protein-concentrate-mitigates-markers-of-colonic-inflammation-and-loss-of-gut-barrier-function-in-vitro-and-in-vivo
#6
Zachary T Bitzer, Amy L Wopperer, Benjamin J Chrisfield, Ling Tao, Timothy K Cooper, Jairam Vanamala, Ryan J Elias, John E Hayes, Joshua D Lambert
Whereas a number of studies have examined the effects of soy isoflavones and tocopherols on colonic inflammation, few have examined soy protein. We determined the radical scavenging and cytoprotective effects of soy protein concentrate (SPC) in vitro and its anti-inflammatory effects in dextran sulfate sodium (DSS)-treated mice. Cotreatment with SPC protected Caco-2 human colon cells from H2O2-induced cell death and mitigated intracellular oxidative stress. Treatment of differentiated Caco-2 cells with SPC blunted DSS-induced increases in monolayer permeability...
November 27, 2016: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/27940083/statistical-investigation-of-simulated-fed-intestinal-media-composition-on-the-equilibrium-solubility-of-oral-drugs
#7
Zhou Zhou, Claire Dunn, Ibrahim Khadra, Clive G Wilson, Gavin W Halbert
Gastrointestinal fluid is a complex milieu and it is recognised that gut drug solubility is different to that observed in simple aqueous buffers. Simulated gastrointestinal media have been developed covering fasted and fed states to facilitate in vitro prediction of gut solubility and product dissolution. However, the combination of bile salts, phospholipids, fatty acids and proteins in an aqueous buffered system creates multiple phases and drug solubility is therefore a complex interaction between these components, which may create unique environments for each API...
March 1, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27933988/niosomes-consisting-of-tween-60-and-cholesterol-improve-the-chemical-stability-and-antioxidant-activity-of-epigallocatechin-gallate-under-intestinal-tract-conditions
#8
Rong Liang, Ling Chen, Wallace Yokoyama, Peter A Williams, Fang Zhong
In order to improve the chemical stability and antioxidant activity of (-)-epigallocatechin gallate (EGCG) in the gastrointestinal tract, niosomes composed of Tween-60 and cholesterol were developed to encapsulate EGCG in this investigation. EGCG loaded niosomes with encapsulation efficiency around 76% exhibited a small Z-average diameter about 60 nm. Compared to free EGCG, the EGCG remaining in dialysis tubes was significantly improved for niosomes at pH 2 and 7.4. Meanwhile, the residual EGCG for niosomes increased from 3% to 49% after 2 h incubation in simulated intestinal fluid (SIF)...
December 7, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27867770/soymilk-residue-okara-as-a-natural-immobilization-carrier-for-lactobacillus-plantarum-cells-enhances-soymilk-fermentation-glucosidic-isoflavone-bioconversion-and-cell-survival-under-simulated-gastric-and-intestinal-conditions
#9
Xia Xiudong, Wang Ying, Liu Xiaoli, Li Ying, Zhou Jianzhong
Cell immobilization is an alternative to microencapsulation for the maintenance of cells in a liquid medium. However, artificial immobilization carriers are expensive and pose a high safety risk. Okara, a food-grade byproduct from soymilk production, is rich in prebiotics. Lactobacilli could provide health enhancing effects to the host. This study aimed to evaluate the potential of okara as a natural immobilizer for L. plantarum 70810 cells. The study also aimed to evaluate the effects of okara-immobilized L...
2016: PeerJ
https://www.readbyqxmd.com/read/27789354/does-the-commonly-used-ph-stat-method-with-back-titration-really-quantify-the-enzymatic-digestibility-of-lipid-drug-delivery-systems-a-case-study-on-solid-lipid-nanoparticles-sln
#10
Martha Heider, Gerd Hause, Karsten Mäder
Enzymatic digestion of lipid drug carriers is very important. Commonly, pancreatin induced formation of fatty acids is monitored by the pH-stat method, which provides a fast, but unspecific readout. However, according to the literature, the pKa values of long chain fatty acids are strongly dependent on the local environment and might vary between 4.2 and 10.15. The high pKa values would lead to an incomplete detection of the lipid digestion and false results. In order to investigate these issues in more detail, we produced cetyl palmitate solid lipid nanoparticles (CP-SLN) stabilized with poloxamer 188 or polysorbate 80...
December 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27777464/sustainable-use-of-silver-warehou-seriollela-punctata-effects-of-storage-processing-conditions-and-simulated-gastrointestinal-digestion-on-selected-in-vitro-bioactivities
#11
V Manikkam, M L Mathai, W A Street, O N Donkor, T Vasiljevic
Australian underutilised fish species may serve as a potential source of valuable proteins and potent bioactive peptides. This novel research is the first to investigate the effects of storage-processing conditions and an in-vitro simulated gastrointestinal digestion (pepsin-pancreatin) on bioactive peptides' release during storage of fish fillet, derived from Australian silver warehou (Seriolella punctata). In-vitro bioactivities including angiotensin-converting enzyme and trypsin inhibitory and antioxidant activities were analysed...
September 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/27770892/preparation-of-chitosan-based-multifunctional-nanocarriers-overcoming-multiple-barriers-for-oral-delivery-of-insulin
#12
Lei Li, Guohua Jiang, Weijiang Yu, Depeng Liu, Hua Chen, Yongkun Liu, Zaizai Tong, Xiangdong Kong, Juming Yao
To overcome multiple barriers for oral delivery of insulin, the chitosan-based multifunctional nanocarriers modified by L-valine (LV, used as a target ligand to facilitate the absorption of the small intestine) and phenylboronic acid (PBA, used as a glucose-responsive unit) have been designed and evaluated in this study. The resultant nanocarriers exhibited low cytotoxicity against HT-29 cells and excellent stability against protein solution. The insulin release behaviors were evaluated triggered by pH and glucose in vitro...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27664971/characterization-of-peptides-from-common-bean-protein-isolates-and-their-potential-to-inhibit-markers-of-type-2-diabetes-hypertension-and-oxidative-stress
#13
Luis Mojica, Diego A Luna-Vital, Elvira González de Mejía
BACKGROUND: Diabetes and hypertension are diseases affecting a high proportion of the world population; the use of food-based products such as common bean peptides may contribute to reduce the risk of complications associated to chronic diseases. The aim was to produce and characterize peptides from common bean protein isolates and evaluate their potential to inhibit markers of type-2 diabetes, hypertension and oxidative stress. RESULTS: Mexican black and Brazilian Carioca bean isolated proteins were characterized after pepsin/pancreatin digestion...
September 24, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27664667/digestibility-and-antigenicity-of-%C3%AE-lactoglobulin-as-affected-by-heat-ph-and-applied-shear
#14
Toheder Rahaman, Todor Vasiljevic, Lata Ramchandran
Processing induced conformational changes can modulate digestibility of food allergens and thereby their antigenicity. Effect of different pH (3, 5, 7), temperature (room temperature, 120°C) and shear (0s(-1), 1000s(-1)) on simulated gastrointestinal digestibility of β-lg and post digestion antigenic characteristics have been studied. At all pH levels unheated β-lg showed resistance to peptic digestion with high antigenic value while it was fairly susceptible to pancreatin with moderate reduction in antigenicity...
February 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27618657/efficacy-of-pancreatic-exocrine-replacement-therapy-for-patients-with-unresectable-pancreatic-cancer-in-a-randomized-trial
#15
Sang Myung Woo, Jungnam Joo, So Young Kim, Sang-Jae Park, Sung-Sik Han, Tae Hyun Kim, Young Hwan Koh, Seung Hyun Chung, Yun-Hee Kim, Hae Moon, Eun Kyung Hong, Woo Jin Lee
BACKGROUND: Weight loss in pancreatic cancer is associated with maldigestion due to pancreatic duct obstruction. Pancreatic exocrine replacement therapy (PERT) may significantly improve fat and protein absorption. OBJECTIVES: This prospective, double-blind, randomized, placebo-controlled phase II trial assessed whether PERT could reduce or prevent weight loss in patients with unresectable pancreatic cancer. METHODS: Sixty seven patients with unresectable pancreatic cancer were randomized to receive enteric coated PERT, consisting of 6-9 capsules of pancreatin (457...
November 2016: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
https://www.readbyqxmd.com/read/27586964/effect-of-four-commonly-used-dissolution-media-surfactants-on-pancreatin-proteolytic-activity
#16
Maya Guncheva, Erika Stippler
Proteolytic enzymes are often used in dissolution testing of cross-linked gelatin capsules that do not conform to the dissolution specification. Their catalytic activity, however, can be affected when they are added to a dissolution media containing solubility enhancers, such as surfactants. The aim of this study was to assess the activity of pancreatic proteases in presence of four commonly used surfactants. We found that pancreatin exhibits remarkable proteolytic activity in the presence of Tween 80, even at the concentrations as high as 250 times its critical micelle concentration (cmc) in water, whereas, Triton X-100 enhanced the proteolytic activity of pancreatin when added at concentrations above its cmc in water...
September 1, 2016: AAPS PharmSciTech
https://www.readbyqxmd.com/read/27575686/safety-assessment-of-dicamba-mono-oxygenases-that-confer-dicamba-tolerance-to-various-crops
#17
Cunxi Wang, Kevin C Glenn, Colton Kessenich, Erin Bell, Luis A Burzio, Michael S Koch, Bin Li, Andre Silvanovich
Dicamba tolerant (DT) soybean, cotton and maize were developed through constitutive expression of dicamba mono-oxygenase (DMO) in chloroplasts. DMO expressed in three DT crops exhibit 91.6-97.1% amino acid sequence identity to wild type DMO. All DMO forms maintain the characteristics of Rieske oxygenases that have a history of safe use. Additionally, they are all functionally similar in vivo since the three DT crops are all tolerant to dicamba treatment. None of these DMO sequences were found to have similarity to any known allergens or toxins...
November 2016: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/27553262/plga-nanoparticles-for-peroral-delivery-how-important-is-pancreatic-digestion-and-can-we-control-it
#18
Anika Mante, Martha Heider, Christin Zlomke, Karsten Mäder
Biodegradable nanoparticles made of Poly(lactide-co-glycolide) are increasingly proposed for the improvement of oral drug absorption, but also as carriers for the treatment of colonic diseases. Unfortunately, our knowledge of the digestibility of PLGA-NPs is rather limited. Therefore, we investigated the impact of pancreatin on the digestibility of PLGA-NPs stabilized with different emulsifiers. The pancreatin induced degradation was monitored by the pH-stat method and an enzymatic l-lactic acid assay. A high digestibility was found for poloxamer 188 and polysorbate 80 stabilized PLGA-NPs...
November 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27546910/in-vitro-digestion-method-for-estimation-of-copper-bioaccessibility-in-a%C3%A3-a%C3%A3-berry
#19
Lena Ruzik, Justyna Wojcieszek
ABSTRACT: Copper is an essential trace element for humans and its deficiency can lead to numerous diseases. A lot of mineral supplements are available to increase intake of copper. Unfortunately, only a part of the total concentration of elements is available for human body. Thus, the aim of the study was to determine bioaccessibility of copper in Açai berry, known as a "superfood" because of its antioxidant qualities. An analytical methodology was based on size exclusion chromatography (SEC) coupled to a mass spectrometer with inductively coupled plasma (ICP MS) and on capillary liquid chromatography coupled to tandem mass spectrometer with electrospray ionization (µ-HPLC-ESI MS/MS)...
2016: Monatshefte Für Chemie
https://www.readbyqxmd.com/read/27518039/novel-ciliate-lipases-for-enzyme-replacement-during-exocrine-pancreatic-insufficiency
#20
Alexander Brock, Ingo Aldag, Stella Edskes, Marcus Hartmann, Torsten Herzog, Waldemar Uhl, Juergen Schnekenburger
AIM AND OBJECTIVES: Exocrine pancreatic insufficiency caused by inflammation or pancreatic tumors results in nutrient malfunction by a lack of digestive enzymes and neutralization compounds. Despite satisfactory clinical results with current enzyme therapies, a normalization of fat absorption in patients is rare. An individualized therapy is required that includes high dosage of enzymatic units, usage of enteric coating, and addition of gastric proton pump inhibitors. The key goal to improve this therapy is to identify digestive enzymes with high activity and stability in the gastrointestinal tract...
November 2016: European Journal of Gastroenterology & Hepatology
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