Inoculation Of Starter Cultures Research Articles

The impact of raw material form and starter culture inoculation on bacterial communities and metabolites in fermented anchovy sauce

This study explored the dynamics of anchovy sauce fermentation and investigated how the raw material form and the use of starter cultures affect bacterial and metabolite profiles. Using a comprehensive approach, we examined the fermentation process using anchovies in two forms (whole and ground) and three different starter cultures. The use of ground anchovies resulted in an accelerated fermentation process for anchovy sauce; however, the increased diversity of bacterial phylotypes and altered accumulation of biogenic amines were observed. Inoculation of starter cultures resulted in a shift from spontaneous to controlled fermentation, highlighting their ability to regulate bacterial communities. Despite a slightly reduced fermentation rate, inoculation with Tetragenococcus halophilus was shown to be a potent method for reducing biogenic amines and affecting metabolite profiles. As the industry strives to balance fermentation speed and quality, our research could provide insights for improving the efficiency, safety, and quality of anchovy sauce production.

Exploring flavor perception through metabolite profiling and sensory approaches during starter kimchi fermentation

Starter cultures can enhance sensory properties during the starter kimchi fermentation. However, while many studies have primarily focused on physicochemical properties, the impact of starters on flavor perception remains unclear. The aim of this study was to assess the impact of starter culture inoculation, specifically Companilactobacillus allii WiKim39 and Lactococcus lactis WiKim0124, on aroma and flavor perception through a comparison of metabolite profiling and electronic tongue and nose data. Notably, 19 and 11 compounds were identified using UHPLC-Q-Orbitrap-MS and HPLC, respectively. Principal component analysis revealed that variations in fermentation metabolites and sensory properties were significantly categorized based on the particular starter culture employed during the ripening process. Moreover, the correlation analysis between the 19 key fermentative metabolites and e-tongue measurements in each starter kimchi revealed significant differences in sourness (AHS), bitterness (SCS), and comprehensive taste (CPS and PKS) sensors. The e-nose system identified four major volatile compounds contributing to the sweetness and off-flavor-related aroma profile of the starter kimchi. These findings highlight the significant impact that starter culture has on taste and flavor development, serving as a valuable guide in predicting sensory properties during starter kimchi fermentation.

Influence of Fermentation Time and Inoculation of Starter Culture on the Chemical Composition of Fermented Natural Coffee Followed by Depulping.

Fermentation using starter cultures has been considered an alternative and economically viable technology for the production of specialty coffees. This type of technology promotes several benefits, such as increased sensory quality, control over the fermentation process, predictability of the final product and added value. Coffee (Coffea arabica L.) samples for this study were collected in Presidente Olegário - MG (2018/19 crop year) in the Cerrado region of Minas Gerais. The effects of natural fermentation and inoculation of the yeast Torulaspora delbrueckii and duration of fermentation (0, 24, 48, 72 and 96 hours) on the sensory and chemical quality (analysis of bioactive, volatile, and organic compounds and fatty acids) of coffee were evaluated. The objective of this study was to determine the effect of fermentation time and starter culture inoculation on the chemical composition of fermented coffees. Fermentation time significantly influenced the sensory description of the coffee beverage, with notes of honey, brown sugar and almond predominating up to 48 hours, for coffees fermented for 72 and 96 hours the notes described were and fruity, winey notes. The chemical composition was primarily influenced by fermentation time.

The effect of ultrasound process on lactic acid bacteria, physicochemical and sensory properties of yoghurt, before and after inoculation of starter cultures into milk

The effect of ultrasound (US) applied before (US + i) and after (i + US) inoculation of yoghurt starter into cows' milk on some parameters of yoghurt was investigated. Lightness (L*) values, amounts of acetaldehyde, diacetyl, acetoin, ethanol, lactic, pyruvic, and acetic acid were higher in the US‐treated groups compared with control (P < 0.05). In the US + i group, the total amount of ketones increased. Lactobacillus and Streptococcus spp. numbers reached log ≥7.0 cfu/g in all groups (P > 0.05). It can be concluded that low‐intensity ultrasound applied to cows' milk before or after inoculation of yoghurt starters increases the aroma components and organic acid content of yoghurt.

Effects of anaerobic and respiratory adaptation of Lacticaseibacillus casei N87 on fermented sausages production

Lacticaseibacillus casei N87 was used as starter culture for the production of fermented sausages. The strain was cultivated in anaerobic (A) and respiratory (growth in presence of oxygen and supplementation with haeme and menaquinone in the growth medium; R) conditions. Control without the starter culture inoculation and with the addition of 150 mg/kg of nitrate was also included. The effect on physico-chemical parameters (pH, Aw, weight loss, and color), microbial population, volatilome, proteolysis as well as the survival of the strain was evaluated during 90 days of ripening. Q-PCR and DGGE-PCR analyses demonstrated the ability of the strain used in this study to adapt to this environment and carry out the sausage's fermentation process. The inoculation of the strain did not have any effect on the Aw values, which decreased similarly in the different samples whereas the pH was lower in A samples (5.2) and the weight loss in R samples (2.5% less than the others). The color parameters of the samples inoculated with the starter cultures were comparable to those of the control added with nitrate. The concentration of aldehydes that usually are identified as marker of oxidation processes was similar in the samples inoculated with the starter cultures adapted under respiratory conditions and in the control. On the contrary, a higher level was detected in the samples inoculated with the starter cultivated under anaerobic conditions. The proteolysis that occurred during the ripening indicates the differentiation of the A samples from the others. Nonetheless, the volatile profiles of the inoculated fermented sausages were similar. The study demonstrated that aerobic adaptation of Lcb. casei N87 starter culture gave similar color parameters and amounts of aldehydes in sausages fermentations without nitrate compared to conventional fermentations with nitrate.

Impact of LAB from Serpa PDO Cheese in Cheese Models: Towards the Development of an Autochthonous Starter Culture.

Serpa is a protected designation of origin (PDO) cheese produced with raw ewes' milk and coagulated with Cynara cardunculus. Legislation does not allow for milk pasteurization and starter culture inoculation. Although natural Serpa's rich microbiota allows for the development of a unique organoleptic profile, it also suggests high heterogeneity. This raises issues in the final sensory and safety properties, leading to several losses in the sector. A possible solution to overcoming these issues is the development of an autochthonous starter culture. In the present work, some Serpa cheese Lactic acid bacteria (LAB)-isolated microorganisms, previously selected based on their safety, technological and protective performance, were tested in laboratory-scale cheeses. Their acidification, proteolysis (protein and peptide profile, nitrogen fractions, free amino acids (FAA)), and volatiles generation (volatile fatty acids (VFA) and esters) potential was investigated. Significant differences were found in all parameters analyzed, showing a considerable strain effect. Successive statistical analyses were performed to compare cheese models and Serpa PDO cheese. The strains L. plantarum PL1 and PL2 and the PL1 and L. paracasei PC mix were selected as the most promising, resulting in a closer lipolytic and proteolytic profile of Serpa PDO cheese. In future work, these inocula will be produced at a pilot scale and tested at the cheese level to validate their application.

Effect of starter cultures and spices on physicochemical properties and microbial communities of fermented fish (Suanyu) after fermentation and storage

Suanyu is one of the traditional Chinese fermented fish products with a pleasant flavor. The present study sought to evaluate the effects of starter cultures and spices on the physicochemical properties and microbial flora of Suanyu after fermentation and storage. The results indicated that fermentation with mixed starter cultures could lower the pH and inhibit TVB-N formation in Suanyu after fermentation and during storage. Moreover, inoculation of starter cultures could promote free amino acids production during storage. Additionally, inoculation of mixed starter cultures and spices mixture could effectively inhibit the formation of most biogenic amines in Suanyu, revealing the significant role of mixed starter cultures. Staphylococcus, Macrococcus, and Lactobacillus were the core microbial genus in Suanyu. The inoculation of starter cultures could inhibit Enteroccoccus and other microorganisms, while spices introduced Bacillus into Suanyu. The study results provide a theoretical basis for the industrial production and storage of Suanyu.

IMPROVEMENT OF BRUSH CHEESE RECIPES BRYNZA TYPE WITH HIGH TITER OF LACTIC BACTERIA

Fermented milk products made by fermenting milk with lactic acid bacteria play an important role in children's nutrition. In particular, brine cheese type "Brynza" has other advantages, including efficient use of raw materials, the ability to sell cheese without maturation or with a short maturation period (not more than 14 days), rapid return on investment. Optimization of the recipe and selection of raw materials for the production of young pickled cheeses with high titers of lactic acid bacteria is an urgent task today in the development of medium-sized businesses and craft industries in Ukraine. It was found that the increase in acidity of the product is influenced by the addition of different composition of starter cultures (Lactococcus lactis subsp. Lactis; Lactococcus lactis subsp. Cremoris; Lactococcus lactis subsp. Lactis (bio diacetylactis); Leuconostoc mesenteroides subsp. effects on acid shift. It was found that organoleptic parameters do not significantly depend on the use of milk pasteurization process, so the use of an additional stage of milk preparation will contribute not only to the profitability of the recipe and raw materials, but also to potential demand for brine cheese "Brynza". It was found that the largest number of living cells of lactic acid bacteria is characteristic of cheese samples made with additional inoculation of starter cultures. Recommendations are given for the use of recipes and the choice of raw materials for the production of brine cheese type "Brynza" with a high titer of lactic acid bacteria.

The application of hurdle technology in extending the shelf life and improving the quality of fermented freshwater fish (Pekasam): A Review

Hurdle technology combines several preservation methods to secure the quality of foods by eliminating or controlling the growth of pathogens, making them last longer and, most importantly, safer for consumption. The hurdle approaches used for this Pekasam is microbially derived hurdle and physico-chemical hurdles. Inoculation of starter cultures with amine oxidase (AO) activity like lactic acid bacteria (LAB) in Pekasam is proven to reduce the accumulation of harmful biogenic amines, especially histamine, for up to 59.9%. This review also involves controlling the water activity and pH of Pekasam to a state where it inhibits the growth of microbes. This can be done by adding natural, cheap, and easy to find ingredients like lime juice (Citrus aurantifolia) to the basic Pekasam recipe. The presence of organic acids in the lime juice act as acidulants; it provides a low pH environment for microbes to retard their growth and therefore reduce the total plate count (TPC) whilst enhancing the flavour of Pekasam. However, in a long- ripened Pekasam, only the water activity hurdle is strengthened with time. Hence, a proper amount of salt is needed to sustain and maintain the water activity level below 0.94. The use of affordable herbs and spices with antimicrobial properties such as garlic, ginger and onion can prevent the proliferation of some pathogenic microbes, commonly found in Pekasam; thus, this helps in increasing the stability of the product. This review aims to outline the application of hurdle technology on fermented freshwater fish quality and shelf life. It focuses on recent accessible applications when combined, providing affordable food which helps those underprivileged people, especially during flash floods and other disruptive calamities such as the COVID-19 pandemic.

The application of hurdle technology in extending the shelf life and improving the quality of fermented freshwater fish (Pekasam): A Review

Hurdle technology combines several preservation methods to secure the quality of foods by eliminating or controlling the growth of pathogens, making them last longer and, most importantly, safer for consumption. The hurdle approaches used for this Pekasam is microbially derived hurdle and physico-chemical hurdles. Inoculation of starter cultures with amine oxidase (AO) activity like lactic acid bacteria (LAB) in Pekasam is proven to reduce the accumulation of harmful biogenic amines, especially histamine, for up to 59.9%. This review also involves controlling the water activity and pH of Pekasam to a state where it inhibits the growth of microbes. This can be done by adding natural, cheap, and easy to find ingredients like lime juice (Citrus aurantifolia) to the basic Pekasam recipe. The presence of organic acids in the lime juice act as acidulants; it provides a low pH environment for microbes to retard their growth and therefore reduce the total plate count (TPC) whilst enhancing the flavour of Pekasam. However, in a long- ripened Pekasam, only the water activity hurdle is strengthened with time. Hence, a proper amount of salt is needed to sustain and maintain the water activity level below 0.94. The use of affordable herbs and spices with antimicrobial properties such as garlic, ginger and onion can prevent the proliferation of some pathogenic microbes, commonly found in Pekasam; thus, this helps in increasing the stability of the product. This review aims to outline the application of hurdle technology on fermented freshwater fish quality and shelf life. It focuses on recent accessible applications when combined, providing affordable food which helps those underprivileged people, especially during flash floods and other disruptive calamities such as the COVID-19 pandemic.

Effects of Lactiplantibacillus plantarum 11 and Chloride Sodium on Biochemical and Microbiological Quality of Table Olives during Fermentation

Background: Table olives are nutritionally a complete food and considered as one of the oldest fermented products. This study aimed to evaluate the effect of Lactiplantibacillus plantarum 11 as a starter culture on the fermentation of table olives at two incubation temperatures 22 and 30 °C and different salt concentrations (0, 4, 8, and 12% m/v) of sodium chloride (NaCl). Methods: The fermentation of table olives was carried out according to the Spanish style. L. plantarum 11 was inoculated as a starter culture (106 Colony Forming Unit (CFU)/ml), and Listeria monocytogenes CECT 4032 was used as an indicator strain. Under the same experimental conditions, the fermentation of olives without the inoculation of starter culture was used as a control. Then, biochemical and microbiological quality of each experimental batch was tested. Results: Unlike the incubation temperature of 22 °C, the pH values ​​obtained in salted batches and incubated at 30 °C were all below the marketing limits for table olives. At the end of the process, the maximum load of yeasts and molds (>5 log CFU/ml) was recorded in the batches incubated at 22 °C. At 22 °C, Listeria was absent in inoculated fermenters at a concentration greater than or equal to 8% (w/v) of NaCl. However, at 30 °C, Listeria was not detected in treatment groups and in the control group with 12% NaCl. Conclusion: L. plantarum 11 could be potentially considered as a probiotic starter culture during the fermentation of black table olives.

Development of Probiotic Beverages Using Fingermillet [Eleusinecoracana (L.) Gaertn.] and Banana [Musa spp.] as Prebiotic Substrates

Aims: Development of probiotic beverages using previously isolated probiotic strains; Lactobacillus plantarum MF405176.1 and Lactobacillus curieae MF405178.1 in finger millet and banana flour substrates, respectively and monitor the microbiological, physicochemical and sensory properties of formulated probiotic beverages.
 Place and Duration of Study: Food Technology Section, Industrial Technology Institute, Colombo, Sri Lanka. Between November 2017 to April 2018.
 Methodology: Moisture content reduced (9 < 10%) finger millet (ravivar.)and banana (ambulnadee var.) flour were weighted seperately (25 g each), suspended in individual containers consisting of 100 ml potable water (n=6) and homogenised to obtain slurries. The slurries were sterilized (121 ± 1oC for 15 min) and cooled (35 ± 1oC) prior to inoculation of starter cultures. Previously isolated, freeze dried probiotic strains; L. plantarum MF405176.1 and L.curieae MF405178.1 were inoculated in to finger millet and banana slurries, respectively at probiotic cell concentration of 1010 CFU/ml. Slurries were allowed to ferment (37 ± 1°C) until the pH reaches < 3.5. Throughout fermentation,pH was monitored hourly, while probiotic cell viability was measured at every 4h. Final products were evaluated for viable probiotic cell count, chemical composition (protein, fat and ash content), physical properties (pH, moisture, total soluble solids and titrable acidity), microbiological quality (aerobic plate count, Yeasts and Mould count, Coliform and Escherichia coli), shelf-life (for 5 weeks at 4 ± 1°C) and Sensory properties (color, odor, appearance, texture and overall acceptability using 9 point hedonic scale).
 Results: Gradual increment of probiotic cell count with fermentation time was observed in both beverages. Compared to their respective controls, significant difference (P = .05) in physical properties (total soluble solids, titrable acidity and pH) and significant increment (P = .05) in chemical properties (fat and protein content) was observed in both beverages. Finger millet based probiotic beverage containing L. plantarum MF405176.1 exhibited better physical, chemical properties and higher acceptability. Further it demonstrated better shelf life compared to banana based beverage containing L. curieae MF405178.1. Both products could sustain the viability of probiotic starter cultures up to 109 CFU/mleven at the end of 5th week of shelf life period thus demonstrated the compatibility of finger millet and banana flour as ideal prebiotic substrates for development of probiotic food.
 Conclusion: Study highlighted the prebiotic potentiality of finger millet and banana flour for the development of dairy free probiotic food. It confirms the behavior of new probiotic strains L. plantarum MF405176.1 and L.curieaeMF405178.1 as starters in lactic acid fermentation.

Optimization of Fermentation Processing of Cheese Flavor Fermented Milk by Response Surface Methodology

The fermentation technology of cheese flavor fermented milk was studied with fresh milk and cheese powder as main raw materials. The sensory score was used as the response value, on the basis of the single factor experiment and response surface Box-Behnken experiment method was used to analyze the addition amount of sugar, stabilizer, starter culture inoculation and cheese powder. Physicochemical and microbial indicators of fermented milk products were tested. The results showed that the optimal fermentation conditions of cheese flavor fermented milk were 8.2% sugar, 0.3% stabilizer, 3.3% starter culture inoculation and 5.1% cheese powder. Under these conditions, the sensory score of the finished product was 94.15. Physicochemical and microbial indicators were: 2.98 g/100 g protein content, 79.2 oT acidity, 9.16×107 CFU/mL lactic acid bacteria, no E. coli was detected. All the above results met the national food standards, and the texture characteristics were close to mainstream stirred flavor fermentation milk on the market.

Unravelling the Impact of Grape Washing, SO2, and Multi-Starter Inoculation in Lab-Scale Vinification Trials of Withered Black Grapes

Wine quality is strongly affected by chemical composition and microbial population of grape must, which, in turn, are influenced by several post-harvest treatments, including grape withering. Different strategies have been suggested to manage the fermenting must microbiota, as it plays a central role in the outcomes of both spontaneous and guided fermentations. This study aimed at evaluating the impact of grape washing, SO2 addition, and selected starter culture inoculation on population dynamics, fermentation kinetics, and main oenological parameters in lab-scale trials, focusing on withered grapes usually used for Amarone production. Although grape washing treatment was effective in removing heavy metals and undesirable microorganisms from grape berry surface, inoculation of multi-starter cultures impacted more fermentation rates. Further, both grape washing and starter inoculation procedures had a remarkable impact on wine chemical characteristics, while 30 mg/L SO2 addition did not significantly affect the fermentation process. In summary, the best strategy in terms of limiting off-flavors and potentially reducing the need for SO2 addition in wine from withered grapes was the use of yeast starters, particularly mixed cultures composed by selected strains of Metschnikowia spp. and Saccharomyces cerevisiae. Application of a washing step before winemaking showed a potential to improve organoleptic characteristics of wine.

Improvement of Raw Milk Cheese Hygiene through the Selection of Starter and Non-Starter Lactic Acid Bacteria: The Successful Case of PDO Pecorino Siciliano Cheese.

This review article focuses on the technological aspects and microbiological critical points of pressed-cooked cheeses processed from raw ewe’s milk without the inoculation of starter cultures, in particular “Pecorino” cheese typology produced in Italy. After showing the composition of the biofilms adhering to the surface of the traditional dairy equipment (mainly wooden vat used to collect milk) and the microbiological characteristics of PDO Pecorino Siciliano cheese manufactured throughout Sicily, this cheese is taken as a case study to develop a strategy to improve its hygienic and safety characteristics. Basically, the natural lactic acid bacterial populations of fresh and ripened cheeses were characterized to select an autochthonous starter and non-starter cultures to stabilize the microbial community of PDO Pecorino Siciliano cheese. These bacteria were applied at a small scale level to prove their in situ efficacy, and finally introduced within the consortium for protection and promotion of this cheese to disseminate their performances to all dairy factories. The innovation in PDO Pecorino Siciliano cheese production was proven to be respectful of the traditional protocol, the final cheeses preserved their typicality, and the general cheese safety was improved. An overview of the future research prospects is also reported.

Effects of starter culture inoculation on microbial community diversity and food safety of Chinese Cantonese sausages by high-throughput sequencing.

Effects of starter culture composed of Lactobacillus sakei, Pediococcus pentosaceus, Staphylococcus xylosus and Staphylococcus carnosus at the ratios (w/w) of 1:1:1:1 on bacterial community diversity and food safety of Chinese Cantonese sausages were demonstrated by high-throughput sequencing technology. At genus level, spoilage organisms and pathogenic bacteria such as Vibrio spp., Acinetobacter spp., Enterobacter spp., Yersinia spp. accounted for 54.13%, 10.01%, 6.94% and 5.35% of bacterial in the initial fermentation of spontaneous sausage, and the dominant bacteria of Lactobacillus spp. reached 84.61% on day 20. Accordingly, the total proportion of Pediococcus spp., Lactobacillus spp. and Staphylococcus spp. were present higher than 98% during fermentation in fermented sausage by starter culture inoculation, and Pediococcus spp. was dominant genus and increased from 53.53 to 74.09% during whole fermentation process. Moreover, the histamine accumulation was lower 84.17% in sausage fermented by starter culture inoculation than that of spontaneous sausage, suggesting that starter culture could decrease histamine accumulation of sausages significantly (P < 0.01). These results revealed that the starter culture inoculation was conducive to improve the microbial quality and food safety of Chinese Cantonese sausages.

Microbial Resources as a Tool for Enhancing Sustainability in Winemaking.

In agriculture, the wine sector is one of the industries most affected by the sustainability issue. It is responsible for about 0.3% of annual global greenhouse gas emissions from anthropogenic activities. Sustainability in vitiviniculture was firstly linked to vineyard management, where the use of fertilizers, pesticides and heavy metals is a major concern. More recently, the contribution of winemaking, from grape harvest to bottling, has also been considered. Several cellar processes could be improved for reducing the environmental impact of the whole chain, including microbe-driven transformations. This paper reviews the potential of microorganisms and interactions thereof as a natural, environmentally friendly tool to improve the sustainability aspects of winemaking, all along the production chain. The main phases identified as potentially interesting for exploiting microbial activities to lower inputs are: (i) pre-fermentative stages, (ii) alcoholic fermentation, (iii) stage between alcoholic and malolactic fermentation, (iv) malolactic fermentation, (v) stabilization and spoilage risk management, and (vi) by-products and wastewater treatment. The presence of proper yeast or bacterial strains, the management and timing of inoculation of starter cultures, and some appropriate technological modifications that favor selected microbial activities can lead to several positive effects, including (among other) energy savings, reduction of chemical additives such as sulfites, and reuse of certain residues.

Effect of Lactococcus lactis inoculation on characteristics and microstructure of dangke cheese with different ripening temperature and incubation time

Physical properties of Dangke cheese can be improved by the ripening process through starter culture inoculation. The purpose of this study was to analyze the characteristics of Dangke cheese with different temperature and incubation time of ripening as well as their interaction by Lactococcus lactis inoculation. The research method used was experimental using a completely randomized design (CRD) with 2 (two) factors. The first factor (A) is the ripening temperature (5, 15, and 25°C) and the second factor (B) is the Ripening time (6, 9, and 12 days). Dangke is made by adding a papaya sap solution as coagulation. Microstructure was observed by a scanning electron microscope. The treatments were replicated three times each process. The data were processed statistically with variance analysis, followed by the least significant difference test. The results indicated that the ripening temperature affected the activity of L. lactis in carbohydrate degradation to produce lactic acid so that it affected the hydrogen potential (pH) and the dangke protein content. Long time ripening provides an opportunity for L. lactis to continue performing activities resulting in a decrease in carbohydrate and pH levels, but there is an increase in total lactic acid and protein levels. The temperature and duration of ripening in dangke manufacture provide an interaction of carbohydrate and protein levels. The Ripening temperature used in the manufacture of Dangke cheese with the addition of L. lactis, preferably 5°C and the duration of 12 days of ripening. The microstructural features show that the duration of ripening causes the Dangke structure to be more compact, as indicated by the proximity of casein molecules with other casein molecules and fat spread evenly in the three-dimensional network of molecules.

Effect of starter cultures on properties of soft white cheese made from camel (Camelus dromedarius) milk

This experiment was conducted to investigate the effect of starter cultures on the physicochemical properties, texture, and consumer preferences of soft white cheese (SWC) made from camel (Camelus dromedarius) milk. The experiment was laid out in a completely randomized design with 5 treatments [starter cultures; i.e., 1 thermophilic (STI-12), 2 blended (RST-743 and XPL-2), and 2 mesophilic (R-707 and CHN-22) cultures]. Starter cultures STI-12 and RST-743 were inoculated at 37°C, whereas XPL-2, R-707, and CHN-22 were inoculated at 30°C. Camel milk inoculated using STI-12 and RST-743 cultures resulted in faster acidification than XPL-2, R-707, and CHN-22 cultures. Camel milk SWC made using STI-12 and CHN-22 cultures gave lower pH (4.54) and titratable acidity (0.59), respectively, whereas R-707 culture resulted in high cheese yield (13.44 g/100 g). In addition, high fat (20.91 g/100 g), protein (17.49 g/100 g), total solids (43.44 g/100 g), and ash (2.40 g/100 g) contents were recorded for SWC made from camel milk made using RST-743 culture. Instrumental analysis of cheese texture revealed differences in resistance to deformation in which camel milk SWC made using RST-743 culture gave higher firmness (3.20 N) and brittleness (3.12 N). However, no significant difference was observed among camel milk SWC adhesiveness made using different starter cultures. Consumer preference for appearance, aroma, taste, and overall acceptances of SWC were affected by inoculation of starter cultures. Considering curd firmness, cheese yield, compositional quality, and textures using STI-12, RST-743, and R-707, these cultures were found to be better for the manufacture of camel milk SWC.

Use of Autochthonous Yeasts and Bacteria in Order to Control Brettanomyces bruxellensis in Wine

Biocontrol strategies for the limitation of undesired microbial developments in foods and beverages represent a keystone toward the goal of more sustainable food systems. Brettanomyces bruxellensis is a wine spoilage microorganism that produces several compounds that are detrimental for the organoleptic quality of the wine, including some classes of volatile phenols. To control the proliferation of this yeast, sulfur dioxide is commonly employed, but the efficiency of this compound depends on the B. bruxellensis strain; and it is subject to wine composition and may induce the entrance in a viable, but nonculturable state of yeasts. Moreover, it can also elicit allergic reactions in humans. In recent years, biological alternatives to sulfur dioxide such as the use of yeasts and lactic acid bacteria starter cultures as biocontrol agents are being investigated. The controlled inoculation of starter cultures allows secure, fast and complete alcoholic and malolactic fermentations, limiting the residual nutrients that B. bruxellensis utilizes to survive and grow in wine. The current study is focused on the assessment of the effect of autochthonous yeasts and bacterial strains from the Apulia Region on the development of B. bruxellensis in wine, in terms of both growth and volatile phenols’ production. The investigation evidences the positive role of indigenous mixed cultures in the control of this spoilage yeast, either co-inoculating different strains of Saccharomyces cerevisiae, S. cerevisiae/non-Saccharomyces or co-inoculating S. cerevisiae/Oenococcus oeni. Our findings expand the existing knowledge of the application of protechnological microbial diversity and of non-Saccharomyces as a biocontrol agent in oenology. We report a further demonstration of the interest in selecting indigenous strains as a strategic tool for winemakers interested in the improvement of regional wines.