{"title":"Effects of ultrafiltration followed by heat or high-pressure treatment on camel and bovine yogurts","authors":"Bhawna Sobti , Mutamed Ayyash , Mustapha Mbye , Meththa Ranasinghe , Akmal Nazir , Rabih Kamleh , Basim Abu-Jdayil , Afaf Kamal-Eldin","doi":"10.1016/j.nfs.2024.100181","DOIUrl":null,"url":null,"abstract":"<div><p>The aim of this study was to assess the effects of ultrafiltration (UF) combined with high-pressure processing (HPP) or heat treatment on the quality of yogurts produced from camel milk (CM) or bovine milk (BM). Milk was concentrated by UF (0, 1, and 2-fold) before applying heat (75 °C or 85 °C for 30 min) or HPP (350 MPa or 550 MPa for 5 min). Yogurts were produced using starter cultures (<em>Streptococcus thermophilus</em> and <em>Lactobacillus bulgaricus</em> subsp. <em>delbrückii</em>) and pH, viscoelastic and thixotropic rheological properties, and protein profiles were determined. Compared to HPP, heat-treated yogurts, especially at 85 °C, exhibited the highest rheological storage and loss moduli signifying stronger gels. Lower storage modulus values in HPP treated CM yogurts were explained by the lack of long-range β-lactoglobulin bridges at micelle surfaces and the reassociation of pressure-dissociated caseins by hydrophobic interactions. Percent structural regeneration, which increased with increasing milk concentration, revealed higher thixotropic behavior in the case of heat- than in HPP-treated samples. SDS-PAGE electrophoresis revealed extensive proteolysis in CM compared to BM yogurts suggesting the involvement of some enzyme activities in the low gel strength.</p></div>","PeriodicalId":19294,"journal":{"name":"NFS Journal","volume":null,"pages":null},"PeriodicalIF":4.1000,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352364624000208/pdfft?md5=779b6d4b659928748d8a3819ce4ae8a2&pid=1-s2.0-S2352364624000208-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"NFS Journal","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352364624000208","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"FOOD SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
The aim of this study was to assess the effects of ultrafiltration (UF) combined with high-pressure processing (HPP) or heat treatment on the quality of yogurts produced from camel milk (CM) or bovine milk (BM). Milk was concentrated by UF (0, 1, and 2-fold) before applying heat (75 °C or 85 °C for 30 min) or HPP (350 MPa or 550 MPa for 5 min). Yogurts were produced using starter cultures (Streptococcus thermophilus and Lactobacillus bulgaricus subsp. delbrückii) and pH, viscoelastic and thixotropic rheological properties, and protein profiles were determined. Compared to HPP, heat-treated yogurts, especially at 85 °C, exhibited the highest rheological storage and loss moduli signifying stronger gels. Lower storage modulus values in HPP treated CM yogurts were explained by the lack of long-range β-lactoglobulin bridges at micelle surfaces and the reassociation of pressure-dissociated caseins by hydrophobic interactions. Percent structural regeneration, which increased with increasing milk concentration, revealed higher thixotropic behavior in the case of heat- than in HPP-treated samples. SDS-PAGE electrophoresis revealed extensive proteolysis in CM compared to BM yogurts suggesting the involvement of some enzyme activities in the low gel strength.
NFS JournalAgricultural and Biological Sciences-Food Science
CiteScore
11.10
自引率
0.00%
发文量
18
审稿时长
29 days
期刊介绍:
The NFS Journal publishes high-quality original research articles and methods papers presenting cutting-edge scientific advances as well as review articles on current topics in all areas of nutrition and food science. The journal particularly invites submission of articles that deal with subjects on the interface of nutrition and food research and thus connect both disciplines. The journal offers a new form of submission Registered Reports (see below). NFS Journal is a forum for research in the following areas: • Understanding the role of dietary factors (macronutrients and micronutrients, phytochemicals, bioactive lipids and peptides etc.) in disease prevention and maintenance of optimum health • Prevention of diet- and age-related pathologies by nutritional approaches • Advances in food technology and food formulation (e.g. novel strategies to reduce salt, sugar, or trans-fat contents etc.) • Nutrition and food genomics, transcriptomics, proteomics, and metabolomics • Identification and characterization of food components • Dietary sources and intake of nutrients and bioactive compounds • Food authentication and quality • Nanotechnology in nutritional and food sciences • (Bio-) Functional properties of foods • Development and validation of novel analytical and research methods • Age- and gender-differences in biological activities and the bioavailability of vitamins, minerals, and phytochemicals and other dietary factors • Food safety and toxicology • Food and nutrition security • Sustainability of food production