1
|
Garbowska M, Berthold-Pluta A, Stasiak-Różańska L, Pluta A. The Impact of the Adjunct Heat-Treated Starter Culture and Lb. helveticus LH-B01 on the Proteolysis and ACE Inhibitory Activity in Dutch-Type Cheese Model during Ripening. Animals (Basel) 2021; 11:ani11092699. [PMID: 34573665 PMCID: PMC8464792 DOI: 10.3390/ani11092699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/08/2021] [Accepted: 09/10/2021] [Indexed: 11/16/2022] Open
Abstract
Simple Summary Adjunct cultures are used in cheesemaking to improve flavour characteristics and accelerating cheese ripening. Different adjunct cultures are capable of producing enzymes with the specificity to hydrolyze caseins, leading to the release of various bioactive compounds. We studied the effect of adjunct heat-treated starter XT–312 and a cheese culture Lb. helveticus LH-B01 on selected physicochemical, microbiological properties, and on proteolysis in cheese models. Additionally, the effect of adjunct cultures on ACE inhibitory activity during ripening was determined. The application of adjunct cultures may be used as functional ingredients in Dutch-type cheese to maintain sufficient bioactive properties and improve proteolysis. Abstract Adjunct cultures are used in cheesemaking to improve the sensory characteristics of the ripened cheeses. In addition, it is known that different adjunct cultures are capable of producing enzymes with the specificity to hydrolyze caseins, leading to the release of various bioactive compounds (bioactive peptides, amino acids, etc.). The objective of this study was to evaluate the effect of adjunct heat-treated starter XT–312 and a cheese culture Lb. helveticus LH-B01 on the proteolytic activity and angiotensin converting enzymes inhibitors (ACE) in cheese models during ripening. Seven different cheese models were evaluated for: proteolytic activity using the spectrophotometric method with ortho-phthaldialdehyde (OPA), soluble nitrogen (SN), trichloroacetic acid-soluble nitrogen (TCA-SN) phosphotungstic acid-soluble nitrogen (PTA-SN), total nitrogen (TN), pH, contents of water, fat, as well as for total bacteria count (TBC), count of Lactococcus genus bacteria, count of Lb. helveticus, and number of non-starter lactic acid bacteria (NSLAB). Presence of adjunct bacterial cultures both in the form of a cheese culture LH-B01 and heat-treated XT–312 starter promoted primary and secondary proteolysis, which resulted in acceleration of the ripening process. ACE inhibitory activity and proteolytic activity was the highest throughout of ripening for cheese model with LH-B01 culture. The cheese models with the adjunct heat-treated starter were characterized by lower TBC, NSLAB and lower count of Lactococcus genus bacteria during ripening, compared to control cheeses.
Collapse
|
2
|
Alhelli AM, Mohammed NK, Khalil ES, Hussin ASM. Optimizing the acceleration of Cheddar cheese ripening using response surface methodology by microbial protease without altering its quality features. AMB Express 2021; 11:45. [PMID: 33751265 PMCID: PMC7984165 DOI: 10.1186/s13568-021-01205-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 03/15/2021] [Indexed: 12/02/2022] Open
Abstract
Cheddar cheese proteolysis were accelerated employing Penicillium candidum PCA1/TT031 protease into cheese curd. In the present study, several of the significant factors such as protease purification factor (PF), protease concentration and ripening time were optimized via the response surface methodology (RSM). The ideal accelerated Cheddar cheese environment consisted of 3.12 PF, 0.01% (v/v) protease concentration and 0.6/3 months ripening time at 10 °C. The RSM models was verified to be the most proper methodology for the maintain of chosen Cheddar cheese. Under this experimental environment, the pH, acid degree value (ADV), moisture, water activity (aw), soluble nitrogen (SN)%, fat and overall acceptability were found to be 5.4, 6.6, 35%, 0.9348, 18.8%, 34% and 13.6, respectively of ideal Cheddar cheese. Furthermore, the predicted and experimental results were in significant agreement, which confirmed the validity and reliability of the suggested method. In spite of the difference between the ideal and commercial Cheddar cheese in the concentration of some of amino acids and free fatty acids, the sensory evaluation did not show any significant difference in aroma profile between them. ![]()
Collapse
|
3
|
Román Naranjo D, Callanan M, Thierry A, McAuliffe O. Superior esterolytic activity in environmental Lactococcus lactis strains is linked to the presence of the SGNH hydrolase family of esterases. JDS COMMUNICATIONS 2020; 1:25-28. [PMID: 36341150 PMCID: PMC9623632 DOI: 10.3168/jdsc.2020-0003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 10/02/2020] [Indexed: 12/28/2022]
Abstract
Lactococcus lactis from environmental niches show high esterolytic activity Higher metabolic diversity is seen in environmental versus dairy L. lactis strains SGNH hydrolase family of esterases may be linked to high esterolytic activity
Lactococcus lactis strains are widely used in the dairy industry in fermentation processes for production of cheese and fermented milks. However, the esterolytic activity of L. lactis is not generally considered high. For this reason, purified microbial lipases and esterases are often added in certain dairy processes to generate specific flavors in the final food product. This work demonstrates the superior esterolytic activity of a collection of L. lactis strains isolated from different environmental sources compared with that of dairy-derived strains. It provides further evidence of the more diverse metabolic capabilities displayed by L. lactis strains from environmental sources compared to their domesticated dairy counterparts. Furthermore, the presence of a 1,287-bp gene encoding a 428-amino acid SGNH hydrolase in the high-esterolytic environmental strains suggests a possible link between superior esterolytic activity and the presence of the esterase from the SGNH hydrolase family.
Collapse
Affiliation(s)
- Desirée Román Naranjo
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
- Cork Institute of Technology, Cork, Ireland
| | - Michael Callanan
- Cork Institute of Technology, Cork, Ireland
- VistaMilk SFI Research Centre, Moorepark, Fermoy, Cork, Ireland
| | | | - Olivia McAuliffe
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
- VistaMilk SFI Research Centre, Moorepark, Fermoy, Cork, Ireland
- Corresponding author
| |
Collapse
|
4
|
Matching starter phenotype to functionality for low salt Cheddar cheese production based on viability, permeability, autolysis, enzyme accessibility and release in model systems. Int Dairy J 2020. [DOI: 10.1016/j.idairyj.2020.104682] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
5
|
Draft Genome Sequences of Four Lactococcus lactis Strains Isolated from Diverse Niches, Including Dairy Products, Grass, and Green Peas. Microbiol Resour Announc 2019; 8:8/35/e00834-19. [PMID: 31467105 PMCID: PMC6715875 DOI: 10.1128/mra.00834-19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Lactococcus lactis has been used for millennia as a starter organism in the production of many fermented dairy products. This announcement includes the draft genome sequences of four strains of Lactococcus lactis, two of dairy origin and two from nondairy sources. Lactococcus lactis has been used for millennia as a starter organism in the production of many fermented dairy products. This announcement includes the draft genome sequences of four strains of Lactococcus lactis, two of dairy origin and two from nondairy sources.
Collapse
|
6
|
Fast and dynamic descriptive techniques (Flash Profile, Time-intensity and Temporal Dominance of Sensations) for sensory characterization of dry-cured loins. Meat Sci 2018; 145:154-162. [DOI: 10.1016/j.meatsci.2018.06.028] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 05/24/2018] [Accepted: 06/24/2018] [Indexed: 11/18/2022]
|
7
|
Luo J, Jiang C, Zhao L, Zhang M, Wang F, Sun E, Ren F. Keto acid decarboxylase and keto acid dehydrogenase activity detected during the biosynthesis of flavor compound 3-methylbutanal by the nondairy adjunct culture Lactococcus lactis ssp. lactis F9. J Dairy Sci 2018; 101:9725-9735. [DOI: 10.3168/jds.2018-14760] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Accepted: 07/17/2018] [Indexed: 11/19/2022]
|
8
|
McAuliffe O, Kilcawley K, Stefanovic E. Symposium review: Genomic investigations of flavor formation by dairy microbiota. J Dairy Sci 2018; 102:909-922. [PMID: 30343908 DOI: 10.3168/jds.2018-15385] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Accepted: 08/24/2018] [Indexed: 01/15/2023]
Abstract
Flavor is one of the most important attributes of any fermented dairy product. Dairy consumers are known to be willing to experiment with different flavors; thus, many companies producing fermented dairy products have looked at culture manipulation as a tool for flavor diversification. The development of flavor is a complex process, originating from a combination of microbiological, biochemical, and technological aspects. A key driver of flavor is the enzymatic activities of the deliberately inoculated starter cultures, in addition to the environmental or "nonstarter" microbiota. The contribution of microbial metabolism to flavor development in fermented dairy products has been exploited for thousands of years, but the availability of the whole genome sequences of the bacteria and yeasts involved in the fermentation process and the possibilities now offered by next-generation sequencing and downstream "omics" technologies is stimulating a more knowledge-based approach to the selection of desirable cultures for flavor development. By linking genomic traits to phenotypic outputs, it is now possible to mine the metabolic diversity of starter cultures, analyze the metabolic routes to flavor compound formation, identify those strains with flavor-forming potential, and select them for possible commercial application. This approach also allows for the identification of species and strains not previously considered as potential flavor-formers, the blending of strains with complementary metabolic pathways, and the potential improvement of key technological characteristics in existing strains, strains that are at the core of the dairy industry. An in-depth knowledge of the metabolic pathways of individual strains and their interactions in mixed culture fermentations can allow starter blends to be custom-made to suit industry needs. Applying this knowledge to starter culture research programs is enabling research and development scientists to develop superior starters, expand flavor profiles, and potentially develop new products for future market expansion.
Collapse
Affiliation(s)
- Olivia McAuliffe
- Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland P61 C996.
| | - Kieran Kilcawley
- Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland P61 C996
| | - Ewelina Stefanovic
- Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland P61 C996
| |
Collapse
|
9
|
Ozturkoglu-Budak S, Aykas DP, Kocak C, Dönmez S, Gursoy A, De Vries RP, Bron PA. Temporal microbiota and biochemical profiles during production and ripening of Divle Cave cheese. INT J DAIRY TECHNOL 2018. [DOI: 10.1111/1471-0307.12493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sebnem Ozturkoglu-Budak
- Department of Dairy Technology; Faculty of Agriculture; Ankara University; Ankara 06110 Turkey
- Fungal Physiology; Westerdijk Fungal Biodiversity Institute & Fungal Molecular Physiology; Utrecht University; Utrecht 3584 CT The Netherlands
| | - Didem P Aykas
- Department of Food Science and Technology; The Ohio State University; 110 Parker Food Science and Technology Building 2015 Fyffe Road Columbus OH USA
- Department of Food Engineering; Faculty of Engineering; Adnan Menderes University; Aydin 09100 Turkey
| | - Celalettin Kocak
- Department of Dairy Technology; Faculty of Agriculture; Ankara University; Ankara 06110 Turkey
| | - Sedat Dönmez
- Department of Food Engineering; Faculty of Engineering; University of Ankara; Ankara 06110 Turkey
| | - Ayse Gursoy
- Department of Dairy Technology; Faculty of Agriculture; Ankara University; Ankara 06110 Turkey
| | - Ronald P De Vries
- Fungal Physiology; Westerdijk Fungal Biodiversity Institute & Fungal Molecular Physiology; Utrecht University; Utrecht 3584 CT The Netherlands
| | - Peter A Bron
- NIZO Food Research; Kernhemseweg 2 Ede 6718 ZB The Netherlands
| |
Collapse
|
10
|
McAuliffe O. Symposium review: Lactococcus lactis from nondairy sources: Their genetic and metabolic diversity and potential applications in cheese. J Dairy Sci 2018; 101:3597-3610. [PMID: 29395148 DOI: 10.3168/jds.2017-13331] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 10/22/2017] [Indexed: 12/21/2022]
Abstract
The widespread dissemination of species of the lactic acid bacteria (LAB) group in different environments testifies to their extraordinary niche adaptability. Members of the LAB are present on grass and other plant material, in dairy products, on human skin, and in the gastrointestinal and reproductive tracts. The selective pressure imparted by these specific environments is a key driver in the genomic diversity observed between strains of the same species deriving from distinct habitats. Strains that are exploited in the dairy industry for the production of fermented dairy products are often referred to as "domesticated" strains. These strains, which initially may have occupied a nondairy niche, have become specialized for growth in the milk environment. In fact, comparative genome analysis of multiple LAB species and strains has revealed a central trend in LAB evolution: the loss of ancestral genes and metabolic simplification toward adaptation to nutritionally rich environments. In contrast, "environmental" strains, or those from raw milk, plants, and animals, exhibit diverse metabolic capabilities and lifestyle characteristics compared with their domesticated counterparts. Because of the limited number of established dairy strains used in fermented food production today, demand is increasing for novel strains, with concerted efforts to mine the microbiota of natural environments for strains of technological interest. Many studies have concentrated on uncovering the genomic and metabolic potential of these organisms, facilitating comparative genome analysis of strains from diverse environments and providing insight into the natural diversity of the LAB, a group of organisms that is at the core of the dairy industry. The natural biodiversity that exists in these environments may be exploited in dairy fermentations to expand flavor profiles, to produce natural "clean label" ingredients, or to develop safer products.
Collapse
Affiliation(s)
- Olivia McAuliffe
- Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland P61 C996.
| |
Collapse
|
11
|
Tidona F, Meucci A, Povolo M, Pelizzola V, Zago M, Contarini G, Carminati D, Giraffa G. Applicability of Lactococcus hircilactis and Lactococcus laudensis as dairy cultures. Int J Food Microbiol 2018; 271:1-7. [PMID: 29459243 DOI: 10.1016/j.ijfoodmicro.2018.02.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 12/18/2017] [Accepted: 02/11/2018] [Indexed: 01/05/2023]
Abstract
The aim of this study was to evaluate whether Lactococcus hircilactis and Lactococcus laudensis can be used as starter cultures. To this end, the two lactococci were characterized for traits of technological and functional interest. Tests in milk included growth at 20, 25, 30, and 37 °C, flavor production, antioxidant (AO) activity, folate and exopolysaccharide (EPS) production. At 30 °C, which resulted the best growth temperature for both strains, Lc. hircilactis and Lc. laudensis lowered the pH of the milk to 4.8 and 5.5, respectively, after 24 h of incubation. Sugar and organic acid composition indicated a higher lactose utilization, coupled with a higher lactate accumulation, by Lc. hircilactis, while galactose was completely consumed by both species. Both strains showed a Cit- phenotype after growth in a selective medium containing citrate as the sole carbon source. Nevertheless, a small amount of citrate was used by both lactococci when grown in milk. The two strains were characterized by a different flavor production, showed high AO activity, and produced small amounts of EPS (~30 mg/L). Lactococcus laudensis showed a weak proteolytic activity while Lc. hircilactis was able to accumulate folate at levels four times higher than uninoculated milk. When the two lactococci were tested as starter cultures in small-scale cheesemaking trials, cheeses resulted of satisfying quality and contained amounts of ethanol, acetic acid, diacetyl and acetoin higher than controls, obtained using a commercial culture. The application of Lc. hircilactis and Lc. laudensis as aromatic cultures in cheesemaking is proposed.
Collapse
Affiliation(s)
- Flavio Tidona
- Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca Zootecnia e Acquacoltura (CREA-ZA), 26900 Lodi, Italy
| | - Aurora Meucci
- Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca Zootecnia e Acquacoltura (CREA-ZA), 26900 Lodi, Italy
| | - Milena Povolo
- Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca Zootecnia e Acquacoltura (CREA-ZA), 26900 Lodi, Italy
| | - Valeria Pelizzola
- Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca Zootecnia e Acquacoltura (CREA-ZA), 26900 Lodi, Italy
| | - Miriam Zago
- Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca Zootecnia e Acquacoltura (CREA-ZA), 26900 Lodi, Italy
| | - Giovanna Contarini
- Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca Zootecnia e Acquacoltura (CREA-ZA), 26900 Lodi, Italy
| | - Domenico Carminati
- Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca Zootecnia e Acquacoltura (CREA-ZA), 26900 Lodi, Italy
| | - Giorgio Giraffa
- Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca Zootecnia e Acquacoltura (CREA-ZA), 26900 Lodi, Italy.
| |
Collapse
|
12
|
Stefanovic E, Thierry A, Maillard MB, Bertuzzi A, Rea MC, Fitzgerald G, McAuliffe O, Kilcawley KN. Strains of the Lactobacillus casei group show diverse abilities for the production of flavor compounds in 2 model systems. J Dairy Sci 2017; 100:6918-6929. [DOI: 10.3168/jds.2016-12408] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 04/22/2017] [Indexed: 01/12/2023]
|
13
|
O'Callaghan TF, Faulkner H, McAuliffe S, O'Sullivan MG, Hennessy D, Dillon P, Kilcawley KN, Stanton C, Ross RP. Quality characteristics, chemical composition, and sensory properties of butter from cows on pasture versus indoor feeding systems. J Dairy Sci 2016; 99:9441-9460. [PMID: 27771086 DOI: 10.3168/jds.2016-11271] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 09/02/2016] [Indexed: 01/27/2023]
Abstract
This study evaluated the effects of 3 widely practiced cow feeding systems in the United States, Europe, and Southern Hemisphere regions on the characteristics, quality, and consumer perception of sweet cream butter. Fifty-four multiparous and primiparous Friesian cows were divided into 3 groups (n=18) for an entire lactation. Group 1 was housed indoors and fed a total mixed ration diet (TMR) of grass silage, maize silage, and concentrates; group 2 was maintained outdoors on perennial ryegrass-only pasture (GRS); and group 3 was maintained outdoors on a perennial ryegrass/white clover pasture (CLV). Mid-lactation butter was manufactured in triplicate with milk from each group in June 2015 (137±7d in milk) and was analyzed over a 6-mo storage period at 5°C for textural and thermal properties, fatty acid composition, sensory properties, and volatile compounds. The nutritional value of butters was improved by pasture feeding, and butter from pasture-fed cows had significantly lower thrombogenicity index scores compared with butters from TMR-fed cows. In line with these results, pasture-derived milks (GRS and CLV) produced butter with significantly higher concentrations of conjugated linoleic acid (cis-9,trans-11) and trans-β-carotene than TMR butter. Alterations in the fatty acid composition of butter contributed to significant differences in textural and thermal properties of the butters. Total mixed ration-derived butters had significantly higher hardness scores at room temperature than those of GRS and CLV. Onset of crystallization for TMR butters also occurred at significantly higher temperatures compared with pasture butters. Volatile analysis of butter by gas chromatography-mass spectrometry identified 25 compounds present in each of the butters, 5 of which differed significantly based on feeding system, including acetone, 2-butanone, 1-pentenol, toluene, and β-pinene. Toluene was very significantly correlated with pasture-derived butter. Sensory analysis revealed significantly higher scores for GRS-derived butter in several attributes including "liking" of appearance, flavor, and color over those of TMR butter. Partial least square regression plots of fatty acid profiles showed clear separation of butter derived from grazed pasture-based perennial ryegrass or perennial rye/white clover diets from that of a TMR system, offering further insight into the ability of fatty acid profiling to verify such pasture-derived dairy products.
Collapse
Affiliation(s)
- Tom F O'Callaghan
- APC Microbiome Institute, University College Cork, Cork, Ireland; Department of Microbiology, University College Cork, Cork, Ireland; Department of Food Biosciences, Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - Hope Faulkner
- Department of Food Biosciences, Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - Stephen McAuliffe
- Teagasc Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Cork, Ireland; School of Biological Sciences, Queen's University, Belfast BT7 1NN, United Kingdom
| | | | - Deirdre Hennessy
- College of Science Engineering and Food Science, University College Cork, Cork, Ireland
| | - Pat Dillon
- College of Science Engineering and Food Science, University College Cork, Cork, Ireland
| | - Kieran N Kilcawley
- Department of Food Biosciences, Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - Catherine Stanton
- APC Microbiome Institute, University College Cork, Cork, Ireland; Department of Food Biosciences, Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - R Paul Ross
- APC Microbiome Institute, University College Cork, Cork, Ireland; Department of Food Biosciences, Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland; College of Science Engineering and Food Science, University College Cork, Cork, Ireland.
| |
Collapse
|
14
|
Garbowska M, Pluta A, Berthold-Pluta A. Changes during ripening of reduced-fat Dutch-type cheeses produced with low temperature and long time (LTLT) heat-treated adjunct starter culture. Lebensm Wiss Technol 2016. [DOI: 10.1016/j.lwt.2016.01.044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
15
|
Strain-to-strain differences within lactic and propionic acid bacteria species strongly impact the properties of cheese–A review. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/s13594-015-0267-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
16
|
Cavanagh D, Casey A, Altermann E, Cotter PD, Fitzgerald GF, McAuliffe O. Evaluation of Lactococcus lactis Isolates from Nondairy Sources with Potential Dairy Applications Reveals Extensive Phenotype-Genotype Disparity and Implications for a Revised Species. Appl Environ Microbiol 2015; 81:3961-72. [PMID: 25841018 PMCID: PMC4524136 DOI: 10.1128/aem.04092-14] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 03/26/2015] [Indexed: 11/20/2022] Open
Abstract
Lactococcus lactis is predominantly associated with dairy fermentations, but evidence suggests that the domesticated organism originated from a plant niche. L. lactis possesses an unusual taxonomic structure whereby strain phenotypes and genotypes often do not correlate, which in turn has led to confusion in L. lactis classification. A bank of L. lactis strains was isolated from various nondairy niches (grass, vegetables, and bovine rumen) and was further characterized on the basis of key technological traits, including growth in milk and key enzyme activities. Phenotypic analysis revealed all strains from nondairy sources to possess an L. lactis subsp. lactis phenotype (lactis phenotype); however, seven of these strains possessed an L. lactis subsp. cremoris genotype (cremoris genotype), determined by two separate PCR assays. Multilocus sequence typing (MLST) showed that strains with lactis and cremoris genotypes clustered together regardless of habitat, but it highlighted the increased diversity that exists among "wild" strains. Calculation of average nucleotide identity (ANI) and tetranucleotide frequency correlation coefficients (TETRA), using the JSpecies software tool, revealed that L. lactis subsp. cremoris and L. lactis subsp. lactis differ in ANI values by ∼14%, below the threshold set for species circumscription. Further analysis of strain TIFN3 and strains from nonindustrial backgrounds revealed TETRA values of <0.99 in addition to ANI values of <95%, implicating that these two groups are separate species. These findings suggest the requirement for a revision of L. lactis taxonomy.
Collapse
Affiliation(s)
- Daniel Cavanagh
- Teagasc Food Research Centre, Moorepark, Fermoy, County Cork, Ireland Department of Microbiology, University College Cork, County Cork, Ireland
| | - Aidan Casey
- Teagasc Food Research Centre, Moorepark, Fermoy, County Cork, Ireland Department of Biological Sciences, Cork Institute of Technology, Bishopstown, Cork, Ireland
| | - Eric Altermann
- Animal Nutrition and Health, AgResearch Ltd., Palmerston North, New Zealand
| | - Paul D Cotter
- Teagasc Food Research Centre, Moorepark, Fermoy, County Cork, Ireland
| | | | - Olivia McAuliffe
- Teagasc Food Research Centre, Moorepark, Fermoy, County Cork, Ireland
| |
Collapse
|
17
|
Cavanagh D, Fitzgerald GF, McAuliffe O. From field to fermentation: the origins of Lactococcus lactis and its domestication to the dairy environment. Food Microbiol 2014; 47:45-61. [PMID: 25583337 DOI: 10.1016/j.fm.2014.11.001] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 10/22/2014] [Accepted: 11/01/2014] [Indexed: 11/18/2022]
Abstract
Lactococcus lactis is an organism of substantial economic importance, used extensively in the production of fermented foods and widely held to have evolved from plant strains. The domestication of this organism to the milk environment is associated with genome reduction and gene decay, and the acquisition of specific genes involved in protein and lactose utilisation by horizontal gene transfer. In recent years, numerous studies have focused on uncovering the physiology and molecular biology of lactococcal strains from the wider environment for exploitation in the dairy industry. This in turn has facilitated comparative genome analysis of lactococci from different environments and provided insight into the natural phenotypic and genetic diversity of L. lactis. This diversity may be exploited in dairy fermentations to develop products with improved quality and sensory attributes. In this review, we discuss the classification of L. lactis and the problems that arise with phenotype/genotype designation. We also discuss the adaptation of non-dairy lactococci to milk, the traits associated with this adaptation and the potential application of non-dairy lactococci to dairy fermentations.
Collapse
Affiliation(s)
- Daniel Cavanagh
- Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland; Department of Microbiology, University College Cork, Co. Cork, Ireland.
| | | | - Olivia McAuliffe
- Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland.
| |
Collapse
|