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1.
J Agric Food Chem ; 72(19): 11268-11277, 2024 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-38695399

RESUMO

Buttermilk is a potential material for the production of a milk fat globule membrane (MFGM) and can be mainly classified into two types: whole cream buttermilk and cheese whey cream buttermilk (WCB). Due to the high casein micelle content of whole cream buttermilk, the removal of casein micelles to improve the purity of MFGM materials is always required. This study investigated the effects of rennet and acid coagulation on the lipid profile of buttermilk rennet-coagulated whey (BRW) and buttermilk acid-coagulated whey (BAW) and compared them with WCB. BRW has significantly higher phospholipids (PLs) and ganglioside contents than BAW and WCB. The abundance of arachidonic acid (ARA)- and eicosapentaenoic acid (EPA)-structured PLs was higher in WCB, while docosahexaenoic acid (DHA)-structured PLs were higher in BRW, indicating that BRW and WCB intake might have a greater effect on improving cardiovascular conditions and neurodevelopment. WCB and BRW had a higher abundance of plasmanyl PL and plasmalogen PL, respectively. Phosphatidylcholine (PC) (28:1), LPE (20:5), and PC (26:0) are characteristic lipids among BRW, BAW, and WCB, and they can be used to distinguish MFGM-enriched whey from different sources.


Assuntos
Leitelho , Queijo , Cabras , Lipidômica , Soro do Leite , Animais , Leitelho/análise , Queijo/análise , Soro do Leite/química , Fosfolipídeos/análise , Fosfolipídeos/química , Glicolipídeos/química , Leite/química , Gotículas Lipídicas/química , Glicoproteínas/química , Glicoproteínas/análise , Lipídeos/química , Lipídeos/análise
2.
Mol Nutr Food Res ; 68(8): e2300909, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38602246

RESUMO

SCOPE: In cases where breast milk is unavailable or inadequate, hydrolyzed infant formula is recommended as the primary alternative. The aim of this study is to assess and compare the allergenicity of two partially hydrolyzed whey-based formulas (PHF-Ws) using serum samples from patients with cow's milk allergy (CMA). METHODS AND RESULTS: LC-MS/MS technology is used to investigate the peptide distribution in both samples. The immunoreactivity of two PHF-Ws in 27 serum samples from 50 Chinese infants (02 years) with CMA is analyzed. The results demonstrate that even with a similar a degree of hydrolysis (DH), primary protein sources, peptides with molecular weights <5 kDa, and differences in the number of residual allergenic epitopes in the hydrolyzed peptide segments can lead to varying immune responses. CONCLUSION: The two PHF-Ws have notably high intolerance rates, exceeding 10% among infants with CMA. Therefore, suggesting that PHF-Ws may not be suitable for infants and children with CMA in China.


Assuntos
Alérgenos , Fórmulas Infantis , Hipersensibilidade a Leite , Proteínas do Soro do Leite , Humanos , Hipersensibilidade a Leite/imunologia , Lactente , China , Feminino , Alérgenos/imunologia , Masculino , Hidrólise , Espectrometria de Massas em Tandem , Soro do Leite/química , Animais
3.
Nutrients ; 16(8)2024 Apr 11.
Artigo em Inglês | MEDLINE | ID: mdl-38674818

RESUMO

This study investigated the characteristics of Lactobacillus helveticus-derived whey-calcium chelate (LHWCC) and its effect on the calcium absorption and bone health of rats. Fourier-transform infrared spectroscopy showed that carboxyl oxygen atoms, amino nitrogen atoms, and phosphate ions were the major binding sites with calcium in LHWCC, which has a sustained release effect in simulated in vitro digestion. LHWCC had beneficial effects on serum biochemical parameters, bone biomechanics, and the morphological indexes of the bones of calcium-deficient rats when fed at a dose of 40 mg Ca/kg BW for 7 weeks. In contrast to the inorganic calcium supplement, LHWCC significantly upregulated the gene expression of transient receptor potential cation V5 (TRPV5), TRPV6, PepT1, calcium-binding protein-D9k (Calbindin-D9k), and a calcium pump (plasma membrane Ca-ATPase, PMCA1b), leading to promotion of the calcium absorption rate, whereas Ca3(PO4)2 only upregulated the TRPV6 channel in vivo. These findings illustrate the potential of LHWCC as an organic calcium supplement.


Assuntos
Osso e Ossos , Cálcio , Lactobacillus helveticus , Animais , Ratos , Cálcio/metabolismo , Osso e Ossos/metabolismo , Osso e Ossos/efeitos dos fármacos , Masculino , Ratos Sprague-Dawley , Soro do Leite/química , Canais de Cátion TRPV/metabolismo , Canais de Cátion TRPV/genética , Cálcio da Dieta/farmacologia , Cálcio da Dieta/administração & dosagem , Suplementos Nutricionais , Canais de Cálcio/metabolismo , Quelantes de Cálcio/farmacologia
4.
Food Chem ; 448: 139119, 2024 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-38547703

RESUMO

Buffalo colostrum is the initial mammary secretion after parturition, consisting of nutritional and bioactive components. In this study, we conducted a proteomic analysis of buffalo colostrum whey to identify bioactive proteins and peptides. A total of 107 differentially expressed proteins (DEPs) were identified in buffalo colostrum whey compared to those in mature milk. Gene Ontology analysis revealed that DEPs were primarily associated with immune response and tissue development. KEGG pathway enrichment suggested that colostrum actively enhances nascent immunity involved in interleukin and interferon signaling pathways. Furthermore, candidate antimicrobial peptides (AMPs) of whey protein hydrolysates from buffalo colostrum were characterized, which exhibits broad-spectrum activity against gram-positive and gram-negative pathogens. Overall, this study improves our understanding of protein variations in buffalo lactation, and contributes to the development of AMPs from buffalo colostrum.


Assuntos
Peptídeos Antimicrobianos , Búfalos , Colostro , Leite , Proteômica , Proteínas do Soro do Leite , Animais , Colostro/química , Colostro/metabolismo , Feminino , Peptídeos Antimicrobianos/química , Peptídeos Antimicrobianos/análise , Peptídeos Antimicrobianos/farmacologia , Peptídeos Antimicrobianos/metabolismo , Leite/química , Proteínas do Soro do Leite/química , Proteínas do Soro do Leite/metabolismo , Proteínas do Soro do Leite/análise , Soro do Leite/química , Soro do Leite/metabolismo
5.
J Hazard Mater ; 469: 133992, 2024 May 05.
Artigo em Inglês | MEDLINE | ID: mdl-38460262

RESUMO

Perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) are persistent anthropogenic chemicals that are widely distributed in the environment and pose significant risks to human health. Foam fractionation has emerged as a promising method to recover PFOS/PFOA from water. However, PFOS/PFOA concentrations in wastewater are often inadequate to generate stable foams due to their high critical micelle concentrations and the addition of a cosurfactant is necessary. In this study, we developed whey soy protein (WSP) as a green frother and collector derived from soybean meal (SBM), which is an abundant and cost-effective agro-industrial residue. WSP exhibited excellent foaming properties across a wide pH range and demonstrated strong collection capabilities that enhanced the recovery of PFOS/PFOA. The mechanism underlying this collection ability was elucidated through various methods, revealing the involvement of electrostatic attraction, hydrophobic interaction, and hydrogen bonding. Furthermore, we designed a double plate internal to improve the enrichment of PFOS/PFOA by approximately 2.3 times while reducing water recovery. Under suitable conditions (WSP concentration: 300 mg/L, pH: 6.0, air flowrate: 300 mL/min), we achieved high recovery percentages of 94-98% and enrichment ratios of 7.5-12.8 for PFOS/PFOA concentrations ranging from 5 to 20 mg/L. This foam fractionation process holds great promise for the treatment of PFOS/PFOA and other per- and polyfluoroalkyl substances.


Assuntos
Ácidos Alcanossulfônicos , Fluorocarbonos , Poluentes Químicos da Água , Humanos , Água , Proteínas de Soja , Soro do Leite/química , Proteínas do Soro do Leite , Fluorocarbonos/análise , Caprilatos/análise , Ácidos Alcanossulfônicos/análise , Poluentes Químicos da Água/análise
6.
Artigo em Inglês | MEDLINE | ID: mdl-38319919

RESUMO

In the category of sports supplements, whey protein powder is one of the popular supplements for muscle building applications. Therefore, verification of the sport supplements as authentic products has become a universal concern. This work aimed to propose vibrational spectroscopy including near infrared (NIR) and infrared (IR) as rapid and non-destructive testing tools for the detection and quantification of maltodextrin, milk powder and milk whey powder in whey protein supplements. Initially, principal component analysis was applied to data for pattern recognition and the results displayed a fine pattern of discrimination. Partial least square discrimination analysis (PLS-DA) and K-nearest neighbours (KNN) were exploited as supervised method modelling classification. This process was done in order to respond to two vital questions whether the sample is adulterated or not and what is the kind of adulteration. PLS-DA showed better classification results rather than KNN according to the figure of merits of the model. Partial least square regression (PLSR) was employed on pre-treated spectra to quantify the amount of adulteration in sport whey supplements. Eventually, it seems vibrational spectroscopy could be implemented as a simple, and low-cost analysis method for the detection and quantification of mentioned adulterants in whey protein supplements.


Assuntos
Contaminação de Alimentos , Soro do Leite , Soro do Leite/química , Proteínas do Soro do Leite/análise , Pós , Contaminação de Alimentos/análise , Análise Espectral , Análise dos Mínimos Quadrados
7.
J Environ Manage ; 351: 119934, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38176384

RESUMO

HiSorb and solid-phase microextraction (SPME), two environmentally friendly micro-extraction techniques based on the same fundamental principles, were evaluated for their extraction efficiency of volatile organic compounds (VOCs) from goat cheese whey wastewater. For this purpose, a sample preparation method based on the headspace-HiSorb technique was developed and evaluated for its efficiency in terms of the amount of extracted compounds and reproducibility of results. Thermal desorption-gas chromatography/mass spectrometry (TD-GC/MS) and GC/MS analytical methods were used to perform the wastewater analysis, respectively. The experimental parameters of HiSorb were evaluated in terms of probe coating, extraction time, stirring speed, sample volume, extraction temperature and salt addition. Under optimal extraction conditions, it was observed that the use of the divinylbenzene/carbon wide range/polydimethylsiloxane (DVB/CWR/PDMS) triple coating for HiSorb and DVB/Carboxen (CAR)/PDMS for SPME, was best suited to extract a broader range of VOCs with higher peak intensities. A total of 34 VOCs were extracted and determined with the DVB/CWR/PDMS HiSorb probe, while only 23 VOCs were determined with the conventional DVB/CAR/PDMS SPME fiber. The DVB/CWR/PDMS HiSorb probe has a higher adsorbent capacity which results in a higher sensitivity for VOCs compared to the DVB/CAR/PDMS SPME fiber. Furthermore, the HiSorb technique exhibits better reproducibility, as indicated by the lower relative standard deviation (RSD) of 3.7% compared to 7.1% for SPME. Therefore, the HiSorb technique is an effective method for detecting VOCs in complex matrices, such as wastewater.


Assuntos
Queijo , Compostos Orgânicos Voláteis , Animais , Compostos Orgânicos Voláteis/análise , Águas Residuárias , Soro do Leite/química , Microextração em Fase Sólida/métodos , Reprodutibilidade dos Testes , Queijo/análise , Cabras
8.
J Dairy Sci ; 107(2): 683-694, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-37709016

RESUMO

A side effect of the raised consumption of Greek yogurt is the generation of massive amounts of yogurt acid whey (YAW). The dairy industry has tried several methods for handling these quantities, which constitute an environmental problem. Although the protein content of YAW is relatively low, given the huge amounts of produced YAW, the final protein amount in the produced YAW should not be underestimated. Taking into consideration the increased interest for bioactive peptides and the increased demand for dietary proteins, combined with protein and peptides content of YAW, efforts should be made toward reintroducing the latter in the food supply chain. In this context and in view of the prevalent dietary iron deficiency problem, the objective of the present study was the investigation of YAW fractions' effect on Fe bioavailability. With this purpose, an in vitro digest approach, following the INFOGEST protocol, was coupled with the Caco2 cell model. To evaluate whether YAW digest fractions exert positive, negative or neutral effect on Fe bioavailability, they were compared with the ones derived from milk, a well-studied food in this context. Milk and YAW showed the same effectiveness on both Fe bioavailability and the expression of relative genes (DCYTB, DMT1, FPN1, and HEPH). Focusing further on YAW fractions, by comparison with their blank digest control counterparts, it resulted that YAW 3- to 10-kDa digests fraction had a superior effect over the 0- to 3-kDa fraction on Fe-uptake, which was accompanied by a similar effect on the expression of Fe metabolism-related genes (DCYTB, FPN1, and HEPH). Finally, although the 3- to 10-kDa fraction of bovine YAW digests resulted in a nonsignificant increased Fe uptake, compared with the ovine and caprine YAW, the expression of DCYTB and FPN1 genes underlined this difference by showing a similar pattern with statistically significant higher expression of bovine compared with ovine and bovine compared with both ovine and caprine, respectively. The present study deals with the novel concept that YAW may contain factors affecting Fe bioavailability. The results show that it does not exert any negative effect and support the extensive investigation for specific peptides with positive effect as well as that YAW proteins should be further assessed on the prospect that they can be used in human nutrition.


Assuntos
Ferro , Soro do Leite , Animais , Ovinos , Bovinos , Humanos , Ferro/metabolismo , Soro do Leite/química , Disponibilidade Biológica , Iogurte , Células CACO-2 , Cabras/metabolismo , Proteínas do Soro do Leite/análise , Peptídeos/metabolismo
9.
J Dairy Sci ; 107(4): 1903-1915, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-37923208

RESUMO

Whey butter is the result of the rational use of the whey component, which is cream whey. It is an alternative to milk cream butter. The aim of the presented study was to analyze the effect of storage conditions on water thermodynamics and cholesterol oxidation products as reliable markers of quality and safety. After 4 mo of storage, the water loss (at 3°C and 13°C) and water activity in whey butter (only at 13°C) were reduced. Three-factorial ANOVA showed that the value of water activity was independent of the type of butter in interaction with the storage temperature. The duration of the translational movement of water molecules from the inside of whey butter was definitely longer than in butter and shortened with storage time. This was in contrast to butter. For whey butter stored at 13°C, the kinetics of the movement of water molecules was at the highest speed. In the case of whey butter and butter, the higher storage temperature almost doubled the gloss. Increasing the temperature to 13°C resulted in different yellowness index, chroma, and browning index between whey butter and butter. There were no statistically significant differences in the percentage of fatty acids and triacylglycerols in whey butter and milk cream butter during storage. In whey butter, compared with butter, the cholesterol content was higher, but the amount of cholesterol oxidation products was smaller. However, in whey butter, these amounts increased significantly. The presence of epoxides and their transformation products (i.e., triol cholesterol) was found in storage whey butter.


Assuntos
Manteiga , Soro do Leite , Animais , Manteiga/análise , Soro do Leite/química , Temperatura , Termodinâmica , Proteínas do Soro do Leite , Colesterol
10.
Int J Biol Macromol ; 258(Pt 2): 128999, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38159692

RESUMO

Spirulina platensis, a microalga known for its exceptional nutritional value, especially its bioactive compounds and protein content, holds promise for incorporation into functional food products. Ricotta cheese whey is a byproduct of the production of ricotta cheese that is difficult to use in industries due to its low pH and less favorable processing qualities. This research aimed to create a unique fermented ricotta cheese whey-based beverage supplemented with various Spirulina powder concentrations (0.25 %, 0.5 %, and 0.75 % w/w) cooperated with a mixture of lemon and peppermint juice 10 % and fermented by probiotic (ABT) culture. The physicochemical, rheological, bioactive compounds, microbiological, and sensory properties were evaluated over a storage period of 21 days at cold storage. Spirulina-fermented whey-based beverages with a mixture of lemon and peppermint juice increased the concentration of vitamins, minerals, antioxidants, and total phenolic compounds in the final product. The count of probiotic bacteria in all fermented beverage samples exceeded 7 log CFU/mL throughout storage, indicating that the fermented beverage kept its probiotic properties. The addition of 0.5 % Spirulina significantly improved the final product's structural qualities and sensory acceptance.


Assuntos
Spirulina , Soro do Leite , Soro do Leite/química , Spirulina/metabolismo , Proteínas do Soro do Leite/química , Bebidas Fermentadas
11.
J Dairy Sci ; 106(12): 8299-8311, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-38040197

RESUMO

Sweet and, to a lesser extent, acid whey protein ingredients can be used for the formulation of infant nutritional products. Unlike acid whey, sweet whey contains caseinomacropeptide (CMP), a heat-stable peptide liberated from κ-casein during cheese and rennet casein manufacture. Four protein systems-sweet whey (SW) and acid whey (AW), with or without standardization for CMP protein content-were added to skim milk (50/50, wt/wt) and unheated or heated to 85 or 110°C. These 12 samples were assessed for physicochemical stability in the presence of added calcium at pH 6.8. The effect of CMP content on the physicochemical properties of the protein systems was also assessed. Without preheat treatment, mixtures of AW and skim milk (SM) were more heat stable than SW and SM, demonstrating the effect of whey protein type on heat stability. Preheat treatment of the SW in the presence of SM significantly improved the heat stability of the resultant protein systems on subsequent heating. All of the protein systems had significantly lower heat stability with the addition of Ca, although the reduction was significantly smaller for the heated protein systems than the unheated controls. The findings can help identify heating parameters and ingredients for optimizing processing stability and physicochemical characteristics of nutritional beverages such as infant formulations.


Assuntos
Caseínas , Soro do Leite , Humanos , Animais , Proteínas do Soro do Leite/química , Soro do Leite/química , Caseínas/química , Temperatura Alta , Concentração de Íons de Hidrogênio , Leite/química , Proteínas do Leite/análise
12.
An Acad Bras Cienc ; 95(4): e20200483, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37991101

RESUMO

The bioconversion of porungo cheese whey to produce ß-galactosidase in batch system was studied. The whey released after curd cutting and precipitation during porungo cheese production was collected in borosilicate flasks. Two strains of Kluyveromyces marxianus, CCT 4086 and CBS 6556, and whey supplementation with different nitrogen sources were evaluated. Different temperatures (30 °C and 37 °C) and pH values (5.0 to 7.0) were investigated to establish the best conditions for enzyme production. The highest enzymatic activity was obtained by K. marxianus CCT 4086 in porungo cheese whey supplemented with yeast extract (16.73 U mL-1). K. marxianus CCT 4086 produced superior ß-galactosidase activity when compared to CBS 6556 for all media tested (ranging from 11.69 to 14.40 U mL-1). Highest ß-galactosidase activity was reached under conditions of pH 7.0 and 30 °C using K. marxianus CCT 4086 in the better media composition. The lowest enzymatic activity was observed at 37 °C for all pH values tested (10.69 U mL-1 to 13.94 U mL-1) and a highest ß-galactosidase activity was reached in pH 7.0 for both two temperatures (11.42 to 15.93 U mL-1). Porungo cheese whey shows potential for industrial ß-galactosidase production by microbial fermentation.


Assuntos
Queijo , Soro do Leite/química , Soro do Leite/metabolismo , Lactose/análise , Fermentação , beta-Galactosidase
13.
J Food Sci ; 88(12): 4892-4906, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37905716

RESUMO

Grape marc (GM) is an agri-food residue from the wine industry valuable for its high content of phenolic compounds. This study aimed to develop an encapsulation system for GM extract (GME) using food-grade biopolymers resistant to gastric conditions for its potential use as a nutraceutical. For this purpose, a hydroalcoholic GME was prepared with a total phenolics content of 219.62 ± 11.50 mg gallic acid equivalents (GAE)/g dry extract and 1389.71 ± 97.33 µmol Trolox equivalents/g dry extract antioxidant capacity, assessed through ABTS (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) assay. Moreover, the extract effectively neutralized reactive oxygen species in Caco-2 cells, demonstrating an intracellular antioxidant capacity comparable to Trolox. The GME was encapsulated using whey protein isolate and pectin through nano spray drying (73% yield), resulting in spherical microparticles with an average size of 1 ± 0.5 µm and a polydispersity of 0.717. The encapsulation system protected the microcapsules from simulated gastrointestinal digestion (GID), where at the end of the intestinal phase, 82% of the initial phenolics were bioaccessible compared to 54% in the free GME. Besides, the encapsulated GME displayed a higher antioxidant activity by the ferric reducing antioxidant power assay than the free extract after GID. These results show the potential of this encapsulation system for applying GME as a nutraceutical with a high antioxidant capacity and protective effect against cellular oxidation.


Assuntos
Antioxidantes , Vitis , Humanos , Antioxidantes/química , Vitis/química , Pectinas , Proteínas do Soro do Leite , Soro do Leite/química , Cápsulas , Células CACO-2 , Fenóis/análise , Digestão
14.
Bull Exp Biol Med ; 175(3): 358-361, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37563534

RESUMO

Antimicrobial activity of milk whey in different mammals against Candida albicans yeast cells was studied by a spectrophotometric method. The activity increased in the order goat→horse→camel→cow→human→mouse. The level of whey activity in mice was higher by 3 and 10 times than in humans and goats, respectively. Similar changes were noted for activity of the whey fraction <100 kDa containing a complex of antimicrobial polypeptides, and there was a direct correlation between these two parameters (r=0.881; p<0.05). The total activity of whey had a high degree of correlation with the content of serum albumin (r=0.992); in mice, the level of serum albumin in the milk whey was close to that in blood serum. Interspecific differences between the activity of whey in mammals may be associated with qualitative and quantitative variability of the antimicrobial polypeptide composition, as well as their synergistic or antagonistic interaction with each other.


Assuntos
Leite , Soro do Leite , Feminino , Bovinos , Cavalos , Humanos , Animais , Camundongos , Leite/química , Soro do Leite/química , Proteínas do Soro do Leite/farmacologia , Proteínas do Soro do Leite/análise , Proteínas do Soro do Leite/química , Mamíferos , Cabras , Peptídeos/análise
15.
J Dairy Sci ; 106(12): 8312-8320, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37641293

RESUMO

The dairy industry uses enzymes to make cheese, alter product flavor, and eliminate lactose. The activities of these enzymes have been measured in clear buffered solutions, but because of the limitations of spectrophotometric methods, enzyme activities have not been measured in opaque or colored dairy products where they are used. Isothermal titration calorimetry (ITC) can be used to determine reaction kinetics in opaque and colored solutions by measuring the heat rate (thermal power) from enzyme-catalyzed reactions as a function of time. This study used ITC to measure ß-galactosidase activity in opaque solutions of milk, sweet whey, sweet whey permeate, acid whey, and acid whey permeate with 2 ß-galactosidase (Enzyme Commission number 3.2.1.23) isozymes derived from Aspergillus oryzae and Kluyveromyces lactis. The components of the dairy fluids alter the enzyme kinetics and reaction thermodynamics, and the reactions catalyzed by the 2 homologues differ as shown by differing thermodynamic profiles. The study demonstrates that ITC can be used to measure enzyme activity in opaque and colored dairy fluids and identify reactions by their thermodynamic properties.


Assuntos
Queijo , Leite , Animais , Calorimetria/veterinária , Soro do Leite/química , beta-Galactosidase/química , Lactose/análise
16.
J Agric Food Chem ; 71(28): 10863-10876, 2023 Jul 19.
Artigo em Inglês | MEDLINE | ID: mdl-37410070

RESUMO

Milk samples were collected from 10 cows, in the colostrum (3-4 days) and mature (90 days) lactation stage, to assess the differential expression of all whey proteins and N-glycoproteins. In total, 240 whey proteins and 315 N-glycosylation sites on 214 glycoproteins were quantified. GO annotations, KEGG pathway analysis, and protein classification were performed to understand the similarities and differences of the biological functions of whey proteins and N-glycoproteins among different lactation stages in bovine milk. Furthermore, differential expression of whey proteins and whey N-glycosylated proteins was found between different lactation stages. The related changes of biological functions in differentially expressed proteins were discussed. For example, the increased frequency of glycosylation on lactoferrin and folate receptor alpha occurring in bovine colostrum may provide protection and stimulate development of the newborn calf. Our study thereby improves understanding of variations of glycosylation sites on milk glycoproteins among lactation stages.


Assuntos
Colostro , Leite , Animais , Bovinos , Feminino , Gravidez , Colostro/química , Glicoproteínas/metabolismo , Lactação , Leite/química , Proteínas do Leite/metabolismo , Proteoma/metabolismo , Soro do Leite/química , Proteínas do Soro do Leite/metabolismo
17.
J Dairy Sci ; 106(9): 5958-5969, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37419740

RESUMO

Delactosed whey permeate is the mother liquor/by-product of lactose manufacture, but it still contains around 20 wt% lactose. The high mineral content, stickiness, and hygroscopic behavior prevent further recovery of lactose in the manufacturing process. Therefore, its use is currently limited to low-value applications such as cattle feed, and more often it is seen as waste. This study investigates a new separation technique operating at sub-zero conditions. At low temperature, precipitation of calcium phosphate is expected to be reduced and the lower solubility at sub-zero temperature makes it possible to recover a large portion of the lactose. We found that lactose could be crystallized at sub-zero conditions. The crystals had a tomahawk morphology and an average size of 23 and 31 µm. In the first 24 h, the amount of calcium phosphate precipitated was limited, whereas the lactose concentration was already close to saturation. The overall rate of crystallization was increased compared with the crystals recovered from a pure lactose solution. Mutarotation was rate limiting in the pure system but it did not limit the crystallization of lactose from delactosed whey permeate. This resulted in faster crystallization; after 24 h the yield was 85%.


Assuntos
Lactose , Soro do Leite , Animais , Bovinos , Soro do Leite/química , Lactose/análise , Cristalização/veterinária , Temperatura , Proteínas do Soro do Leite/química
18.
Molecules ; 28(11)2023 May 24.
Artigo em Inglês | MEDLINE | ID: mdl-37298782

RESUMO

The increase in demand for food flavorings due to the shortening and simplification of food production technology also entails an increase in the demand for new technologies for their production. The biotechnological production of aromas is a solution characterized by a high efficiency, an independence from environmental factors and a relatively low cost. In this study, the influence of the implementation of lactic acid bacteria pre-fermentation into the production of aroma compounds by Galactomyces geotrichum on a sour whey medium on the intensity of the obtained aroma composition was analyzed. The monitoring of the culture in terms of biomass buildup, the concentration of selected compounds, and the pH resulted in the confirmation of interactions between the analyzed microorganisms. The post-fermentation product underwent a comprehensive sensomic analysis for the identification and quantification of the aroma-active compounds. The use of gas chromatography-olfactometry (GC-O) analysis and the calculation of odor activity values (OAVs) allowed 12 key odorants to be identified in the post-fermentation product. The highest OAV was found for phenylacetaldehyde with a honey odor (1815). The following compounds with the highest OAVs were 2,3-butanedione with a buttery aroma (233), phenylacetic acid with a honey aroma (197), 2,3-butanediol with a buttery aroma (103), 2-phenylethanol with a rosy aroma (39), ethyl octanoate with a fruity aroma (15), and ethyl hexanoate with a fruity aroma (14).


Assuntos
Lactobacillales , Compostos Orgânicos Voláteis , Odorantes/análise , Soro do Leite/química , Fermentação , Olfatometria/métodos , Proteínas do Soro do Leite/análise , Compostos Orgânicos Voláteis/análise
19.
Artigo em Inglês | MEDLINE | ID: mdl-37310293

RESUMO

The aim of this study was to investigate the transfer of residues of five ß-lactam antibiotics (ampicillin, penicillin G, cloxacillin, dicloxacillin and cephalexin) and two tetracyclines (tetracycline and oxytetracycline) in the processing of cheese and whey powder, evaluating the effect of the processes and the final concentration in each product generated. Raw milk was fortified at two concentration levels with the seven antibiotics. The first concentration level (C1) was chosen according to the maximum residue limit (MRL) of each antibiotic (ampicillin and penicillin G: 4 µg kg-1; cloxacillin and dicloxacillin: 30 µg kg-1; cephalexin, tetracycline and oxytetracycline: 100 µg kg-1). The second concentration level (C2) was spiked as follows according to each antibiotic: 0.5 MRL (cloxacillin, dicloxacillin, cephalexin), 0.1 MRL (tetracycline and oxytetracycline) and 3 MRL (ampicillin and penicillin G). The antibiotics were analyzed by LC-MS/MS. No ampicillin or penicillin G residues were found in cheese or whey powder, although they were detected in whey at concentrations similar to those added to raw milk. Cephalexin was mostly distributed in whey between 82% and 96%, being the antibiotic that presented the highest concentration in whey powder (784 ± 98 µg kg-1) when milk was spiked at the MRL. The whey distribution of cloxacillin and dicloxacillin ranged from 57% to 59% for cloxacillin and from 46% to 48% for dicloxacillin, and both concentrated in whey powder. Tetracyclines were the antibiotics that concentrated in cheese, with retentions between 75% and 80% for oxytetracycline and between 83% and 87% for tetracycline. The distribution of antibiotics in the dissimilar stages of the cheese and whey powder production processes, as well as their concentration in the final products, depend on each type of antibiotic. Knowledge of the transfer of antibiotic residues during the process and final disposal is an input for the risk assessment of their consumption.


Assuntos
Queijo , Resíduos de Drogas , Oxitetraciclina , Animais , Leite/química , beta-Lactamas/análise , Tetraciclina/análise , Pós/análise , Queijo/análise , Oxitetraciclina/análise , Soro do Leite/química , Dicloxacilina/análise , Cromatografia Líquida , Espectrometria de Massas em Tandem , Antibacterianos/análise , Tetraciclinas/análise , Cloxacilina , Ampicilina , Cefalexina , Resíduos de Drogas/análise
20.
J Sci Food Agric ; 103(11): 5634-5640, 2023 Aug 30.
Artigo em Inglês | MEDLINE | ID: mdl-37066729

RESUMO

BACKGROUND: Milk contains a massive class of minor proteins that are known for their various biological and molecular functions. Many whey proteins transfer the host defense mechanism to the human body. In this assay, electrophoresis followed by a high-resolution mass spectrometry-based proteomic approach has been applied to identify the whey proteome of Indian Jersey crossbreed bovines. RESULTS: Two search engines, MS Amanda and Sequest HT, have shown more than 29 minor proteins. Chromosomal mapping revealed that chromosomes 5 and 9 are expressing maximum proteins in the whey proteome. The principal component analysis, outlier plots, scree plots, score plots, and loading plots were generated to further assess the results. CONCLUSION: The majorly expressed ones are glycosylation-dependent cell adhesion molecule-1, ubiquitin, desmoglein, annexin, glycoprotein, arginase, histones, peroxiredoxin, vimentin, desmin, catenin, peripherin, and 70 kDa heat shock protein. © 2023 Society of Chemical Industry.


Assuntos
Leite , Soro do Leite , Feminino , Humanos , Bovinos/genética , Animais , Leite/química , Proteínas do Soro do Leite/química , Soro do Leite/química , Proteoma/genética , Proteoma/metabolismo , Proteômica/métodos , Proteínas do Leite/química
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