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https://www.readbyqxmd.com/read/28441786/application-of-pineapple-juice-in-the-fish-digestion-process-for-carcinogenic-liver-fluke-metacercaria-collection
#1
Panupan Sripan, Ratchadawan Aukkanimart, Thidarut Boonmars, Pranee Sriraj, Jiraporn Songsri, Parichart Boueroy, Sukhonthip Khueangchaingkhwang, Benjamabhorn Pumhirunroj, Atchara Artchayasawat
Pepsin is common digestive enzyme used for fish digestion in the laboratory to collect trematode metacercariae. In a field study, to survey the infected fish is needed a huge yield of pepsin and it is very expensive. Therefore, our purpose of this study was to investigate the candidate enzyme from pineapple juice which has a digestive enzyme called bromelain, a mixture of proteolytic enzymes, to digest fish in order to harvest metacercariae. Fish were divided into 2 groups: one group in which metacercariae were harvested using acid pepsin as a control and other groups in which the fish was digested using fresh pineapple juices...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28441731/polyphenolic-compounds-and-digestive-enzymes-in-vitro-non-covalent-interactions
#2
REVIEW
Alejandra I Martinez-Gonzalez, Ángel G Díaz-Sánchez, Laura A de la Rosa, Claudia L Vargas-Requena, Ismael Bustos-Jaimes, And Emilio Alvarez-Parrilla
The digestive enzymes-polyphenolic compounds (PCs) interactions behind the inhibition of these enzymes have not been completely studied. The existing studies have mainly analyzed polyphenolic extracts and reported inhibition percentages of catalytic activities determined by UV-Vis spectroscopy techniques. Recently, pure PCs and new methods such as isothermal titration calorimetry and circular dichroism have been applied to describe these interactions. The present review focuses on PCs structural characteristics behind the inhibition of digestive enzymes, and progress of the used methods...
April 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28437072/the-single-disulfide-directed-%C3%AE-hairpin-fold-dynamics-stability-and-engineering
#3
Balasubramanyam Chittoor, Krishnarjuna Bankala, Rodrigo A W Morales, Christopher Andrew MacRaild, Maiada Sadek, Eleanor Ww Leung, Samuel Robinson, Michael Pennington, Raymond S Norton
Grafting bioactive peptide sequences onto small cysteine-rich scaffolds is a promising strategy to enhance their stability and value in novel peptide-based therapeutics. However, correctly folded disulfide-rich peptides can be challenging to produce by either recombinant or synthetic means. The single disulfide-directed β-hairpin (SDH) fold, first observed in contryphan-Vc1, provides a potential alternative to complex disulfide-rich scaffolds. We have undertaken recombinant production of full-length contryphan-Vc1 (rCon-Vc1[Z1Q]) and a truncated analog (rCon-Vc11-22[Z1Q]), analyzed the backbone dynamics of rCon-Vc1[Z1Q], and probed the conformational and proteolytic stability of these peptides to evaluate the potential of contryphan-Vc1 as a molecular scaffold...
April 24, 2017: Biochemistry
https://www.readbyqxmd.com/read/28430776/aminoazo-dye-protein-adduct-enhances-inhibitory-effect-on-digestibility-and-damages-to-gastro-duodenal-hepatic-axis
#4
Li-Yun Lin, Chiung-Chi Peng, Yeh Chen, Boa-Chan Huang, Chun Chao Chang, Robert Y Peng
4-Dimethylaminoazobenzene (DAB, methyl yellow, or butter yellow), a human carcinogen, has been banned for use in foods since 1988. In 2014, DAB adulteration in Tofu occurred in Taiwan. We hypothesize that DAB can form [DAB•SBP]adduct adduct with soybean protein (SBP) which could damage Gastro-Duodenal-Hepatic axis. Sprague-Dawley rats gavage fed [DAB•SBP]adduct adduct revealed severely reduced body weight and damaged duodenum, liver, hepatic mitochondria, and spleen. Hepatic levels of glutathione and ATP were severely reduced...
2017: PloS One
https://www.readbyqxmd.com/read/28426073/ameliorative-effects-of-pepsin-digested-chicken-liver-hydrolysates-on-development-of-alcoholic-fatty-livers-in-mice
#5
Yi-Ling Lin, Szu-Yun Tai, Jr-Wei Chen, Chung-Hsi Chou, Shih-Guei Fu, Yi-Chen Chen
With developments in economics and increasing work loads, alcohol abuse becomes more and more severe, leading to occurrences of alcoholic liver disease (ALD). Pepsin-digested chicken liver hydrolysates (CLHs) contain high amounts of glutamic acid, leucine, lysine, and alanine while the contents of taurine, anserine, and carnosine are also elevated after pepsin hydrolyzation. The objectives of this study were to evaluate the protective effects of CLHs against chronic alcohol consumption. The results indicated that the enlarged (p < 0...
April 20, 2017: Food & Function
https://www.readbyqxmd.com/read/28420411/characterization-of-a-novel-aspartyl-protease-inhibitor-from-haemonchus-contortus
#6
Baojie Li, Javaid Ali Gadahi, Wenxiang Gao, Zhenchao Zhang, Muhammad Ehsan, Lixin Xu, Xiaokai Song, Xiangrui Li, Ruofeng Yan
BACKGROUND: Aspartyl protease inhibitor (API) was thought to protect intestinal parasitic nematodes from their hostile proteolytic environment. Studies on Ostertagia ostertagi, Ascaris suum and Brugia malayi indicated that aspins might play roles in nematode infection. In a recent study, proteins differentially expressed between free-living third-stage larvae (L3) and activated L3 (xL3) of Haemonchus contortus were identified by 2D-DIGE. API was found downregulated in xL3 when compared with L3...
April 19, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28417088/boiling-induced-nanoparticles-and-their-constitutive-proteins-from-isatis-indigotica-fort-root-decoction-purification-and-identification
#7
Jianwu Zhou, Jie Liu, Dai Lin, Guanzhen Gao, Huiqin Wang, Jingke Guo, Pingfan Rao, Lijing Ke
Colloidal particles are essential components of sun-dried Isatis indigotica Fort. roots (Ban-Lan-Gen in Chinese, BLG) decoction. Nanoparticles (NPs) were isolated from BLG decoction with size exclusion chromatography and characterized. Their average diameter is ∼120 nm, reversibly responding to pH and temperature changes. They promoted the growth of normal cells but suppressed that of cancerogenic cells and macrophages. Two constitutive glycated proteins were identified from the NPs, namely BLGP1 and BLGP2...
April 2017: Journal of Traditional and Complementary Medicine
https://www.readbyqxmd.com/read/28416873/collagen-extraction-from-mussel-byssus-a-new-marine-collagen-source-with-physicochemical-properties-of-industrial-interest
#8
F Rodríguez, L Morán, G González, E Troncoso, R N Zúñiga
Mussel byssus is a by-product of mussel production and is a potential source of collagen. The goal of this study was to extract collagen from the byssus of Chilean mussel using an enzymatic method and characterize it. A pepsin-aided extraction method was employed where first an enzymatic hydrolysis at two pepsin/substrate ratios (1:50 or 4:50) and times (4 or 24 h) was done. Extraction was conducted at 80 °C for 24 h, in a 0.5 N acetic acid solution. All samples were analyzed for collagen content, amino acid profile, turbidity, viscosity, solubility, denaturation temperature and surface tension...
April 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28407892/molecular-characterization-and-bio-functional-property-determination-using-sds-page-and-rp-hplc-of-protein-fractions-from-two-nigella-species
#9
Muhammad H Alu'datt, Taha Rababah, Mohammad N Alhamad, Moh'd Alodat, Majdi A Al-Mahasneh, Sana Gammoh, Khalil Ereifej, Ali Almajwal, Stan Kubow
This study aimed to investigate the molecular and bio-functional properties of protein fractions from Nigella damascena and Nigella arvensis, including the albumin, globulin, glutein-1, glutein-2 and prolamin fractions. Protein subunits were not observed in globulin and prolamin fractions. No peaks appeared in RP-HPLC chromatograms of globulin for either species. Two predominant peaks were observed in the RP-HPLC profiles of all protein fractions. Proteins separated by RP-HPLC have potential inhibitory and antioxidant activities in all fractions...
September 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28407546/exploring-adduct-formation-between-human-serum-albumin-and-eleven-organophosphate-ester-flame-retardants-and-plasticizers-using-maldi-tof-tof-and-lc-q-tof
#10
Shaogang Chu, Margaret R Baker, Gladys Leong, Robert J Letcher, Shirley J Gee, Bruce D Hammock, Qing X Li
Organophosphate (OP) and organophosphate ester (OPE) adducts of albumin are valuable biomarkers for retrospective verification of exposure. In the present study, our goal was to determine whether OPE flame retardants (OPE FRs) and OPE plasticizers can covalently bind to human serum albumin (HSA), which would allow the resulting adducts to be used to evaluate exposure. Eleven OPE FRs and plasticizers were examined in a HSA-adduct in vitro assay. Pure HSA was incubated with the target OPEs, as well as with an OP insecticide (profenofos) positive control...
March 31, 2017: Chemosphere
https://www.readbyqxmd.com/read/28403748/a-cost-effective-method-of-atelo-collagen-type-1-3-col1-3-isolation-from-human-placenta-and-its-in-vitro-characterization-in-2d-and-3d-cell-culture-applications
#11
Johannes Hackethal, Severin Mühleder, Alexandra Hofer, Karl Heinrich Schneider, Johanna Prüller, Simone Hennerbichler, Johann Eibl, Heinz Redl, Andreas Herbert Teuschl
Pepsin-solubilized atelocollagen can be used to form highly complex three-dimensional matrices for a broad spectrum of tissue engineering applications. Moreover, it has a long history as a favorable biomaterial in pharmaceutical and medical industries. So far, the main sources for these approaches are collagens from xenogenic sources. Yet, these non-human collagens carry a risk of provoking immune reactions in patients. Here, we describe an effective method of isolating atelocollagen type 1/3 (COL1/3) from human placenta...
April 12, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28399445/sensitive-detection-of-alkaline-phosphatase-by-switching-on-gold-nanoclusters-fluorescence-quenched-by-pyridoxal-phosphate
#12
Mohamed Ibrahim Halawa, Wenyue Gao, Muhammad Saqib, Shimeles Addisu Kitte, Fengxia Wu, Guobao Xu
In this work, we designed highly sensitive and selective luminescent detection method for alkaline phosphatase using bovine serum albumin functionalized gold nanoclusters (BSA-AuNCs) as the nanosensor probe and pyridoxal phosphate as the substrate of alkaline phosphatase. We found that pyridoxal phosphate can quench the fluorescence of BSA-AuNCs and pyridoxal has little effect on the fluorescence of BSA-AuNCs. The proposed mechanism of fluorescence quenching by PLP was explored on the basis of data obtained from high-resolution transmission electron microscopy (HRTEM), dynamic light scattering (DLS), UV-vis spectrophotometry, fluorescence spectroscopy, fluorescence decay time measurements and circular dichroism (CD) spectroscopy...
April 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28396857/proteome-profiles-of-digested-products-of-commercial-meat-sources
#13
Li Li, Yuan Liu, Guanghong Zhou, Xinglian Xu, Chunbao Li
This study was designed to characterize in vitro-digested products of proteins from four commercial meat products, including dry-cured ham, cooked ham, emulsion-type sausage, and dry-cured sausage. The samples were homogenized and incubated with pepsin and trypsin. The digestibility and particle sizes of digested products were measured. Nano-LC-MS/MS was applied to characterize peptides. The results showed the highest digestibility and the lowest particle size in dry-cured ham (P < 0.05), while the opposite was for cooked ham (P < 0...
2017: Frontiers in Nutrition
https://www.readbyqxmd.com/read/28395823/gastric-toxicity-involving-alterations-of-gastritis-related-protein-expression-in-mice-following-long-term-exposure-to-nano-tio2
#14
Fashui Hong, Nan Wu, Yingjun Zhou, Li Ji, Ting Chen, Ling Wang
Nano TiO2 has been widely used in food industry as a coloring agent, whether the application has adverse effects on stomach for humans and animals is rarely concerned. This study determined whether intragastric administration with nano TiO2 every day for nine months cause gastric damages and dysfunction, and is associated with changes of stomach damage-related protein expression in mice. Our results suggested that nano TiO2 exposure resulted in significant titanium accumulation in the stomach, reductions in daily food intake and water intake, stomach weight, and stomach indices...
May 2017: Food Research International
https://www.readbyqxmd.com/read/28395818/effects-of-different-proteases-on-iron-absorption-property-of-egg-white-hydrolysates
#15
Yasumi Horimoto, Loong-Tak Lim
One of the causes of iron deficiency in human is poor absorption of non-heme iron from the diet. While proteins from meats have been reported in the literature to enhance the absorption of non-heme iron, other proteins, such as those from egg, are known to inhibit iron absorption. The objective of this study is to investigate non-heme iron binding property of egg white proteins hydrolyzed using pepsin and a combination of bacterial/fungal proteases. The iron bioavailability of non-heme iron, in the presence of egg white (EW) hydrolysates, was evaluated in vitro using a tissues culture model system - rat intestinal epithelial cells (IEC-6)...
May 2017: Food Research International
https://www.readbyqxmd.com/read/28394630/plant-proteases-for-bioactive-peptides-release-a-review
#16
M A Mazorra-Manzano, J C Ramírez-Suarez, R Y Yada
Proteins are a potential source of health promoting biomolecules with medical, nutraceutical and food applications. Nowadays, bioactive peptides production, its isolation, characterization and strategies for its delivery to target sites are a matter of intensive research. In vitro and in vivo studies regarding the bioactivity of peptides has generated strong evidence of their health benefits. Dairy proteins are considered the richest source of bioactive peptides, however proteins from animal and vegetable origin also have been shown to be important sources...
April 10, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28378400/interaction-between-azo-dye-acid-red-14-and-pepsin-by-multispectral-methods-and-docking-studies
#17
Ludan Zhao, Ronghui Guo, Qiaomei Sun, Jianwu Lan, Hui Li
The interaction of synthetic azo dye Acid Red 14 with pepsin was studied by fluorescence spectroscopy, UV-vis spectroscopy, circular dichroism and molecular docking. Results from the fluorescence spectroscopy show that Acid Red 14 has a strong capability to quench the intrinsic fluorescence of pepsin with static quenching. Binding constant, number of the binding sites and thermodynamic parameters were measured at different temperatures. The result indicates that Acid Red 14 interact with pepsin spontaneously by hydrogen bonding and van der Waals interactions...
April 5, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28375567/biological-characteristics-of-staphylococcal-enterotoxin-q-and-its-potential-risk-for-food-poisoning
#18
D-L Hu, H K Ono, S Isayama, R Okada, M Okamura, L C Lei, Z S Liu, X-C Zhang, M Y Liu, J C Cui, A Nakane
AIMS: To elucidate the biological characteristics and stability of a newly identified staphylococcal enterotoxin Q (SEQ) against heating and digestive enzymes, and evaluate the risk of seq-harboring S. aureus in food poisoning. METHODS AND RESULTS: Purified SEQ was treated with heating, pepsin and trypsin that are related to food cooking, stomach and intestine conditions. Superantigenic activity of SEQ was assessed by determining the ability of IL-2 induction in mouse spleen cells...
April 4, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28375103/antioxidant-and-antiproliferative-activities-of-protein-hydrolysate-from-the-rhizomes-of-zingiberaceae-plants
#19
Kanok Inthuwanarud, Polkit Sangvanich, Songchan Puthong, Aphichart Karnchanatat
Plant proteins have been investigated for their antioxidant activities, but there are still no reports detailing the antioxidant activity levels of plants in the Zingiberaceae family, which are popular food agents and used in folklore medicine. In this study, the crude rhizome protein extract and associated pepsin/pancreatin protein hydrolysate of 15 plants in the Zingiberaceae family were screened using the DPPH method for antioxidant activity. The protein hydrolysate of C. zedoaria possessed the highest antioxidant activity (IC50of 25...
November 2016: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28363646/characterisation-of-acid-soluble-and-pepsin-solubilised-collagen-from-frog-rana-nigromaculata-skin
#20
Junjie Zhang, Rui Duan
As the first vertebrates connecting water and land, frogs must have evolved certain specialisations. To find the difference among the collagens from amphibian, fish and mammal animals, acid-soluble collagen (ASC) and pepsin-solubilised collagen (PSC) from frog skin were isolated and characterised. The yield of PSC (19.59%, dry weight) was higher than that of ASC (1.83%, dry weight). The hydroxyproline-to-protein ratio of frog skin was 8.37%, which was higher than that of carp skin ASC (7.83%) but significantly lower than that of calf skin collagen (10...
March 28, 2017: International Journal of Biological Macromolecules
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