International Journal of Dairy Technology最新文献

The effect of using camel milk on the physiochemical, microbiological and sensory properties, and free amino acid and biogenic amine contents of processed Domiati cheese was investigated during pickling (90 days) at 4°C. The results revealed a decrease in biogenic amines and an increase in free amino acids in cheese made from camel milk compared to cheese made from buffalo milk. Histamine and tryptamine were the most predominant amines in all the treatments (13 and 12 mg/kg), respectively. All samples had lower than the allowable level of biogenic amines, according to the Food and Drug Administration (10 mg/100 g).

In pursuit of expanding dietary options for those with allergies, we aimed to develop a low-allergenic fermented milk beverage. We adopted a combination fermentation strategy to enhance the allergy mitigation efficacy of 4 strains of lactic acid bacteria. Our fermentation conditions were optimised with an equal ratio (1:1:1:1) of strains, a total 5% inoculation rate and fermentation at 40°C for 6.5 h. Under conditions, the antigen reduction rates for α-lactalbumin (α-LA), β-lactoglobulin (β-LG), α-casein and β-casein were impressive, ranging from 43.54 to 70.51%. A 28-day storage assessment showed that the reduction rates of the 4 antigens ranged from 38.98% to 78.06%. Most importantly, it was found through indirect competitive ELISA that the binding ability of immunoglobulin E to α-LA and β-LG, which we are concerned about, was significantly reduced compared to the unfermented sample. Notable, the beverage maintained favorable physicochemical properties throughout the storage period.

This study investigated the impact of erythritol (ERY) on structural and functional properties of whey protein isolate (WPI). FTIR and CD revealed that WPI underwent structural changes, including formation of β-folds and random coils, upon interaction with 20 mg/mL ERY. SEM showed increased surface roughness of WPI, indicating enhanced protein exposure. Moreover, binding rate exceeded 85%, accompanied by increased surface hydrophobicity. Fluorescence spectroscopy indicated a red shift in fluorescence of WPI and tyrosine (Tyr) residues, altering polarity of Tyr environment due to ERY coordination. Additionally, ERY presence enhanced the functional properties of WPI, including foaming, freeze–thaw stability, rheology and antioxidant activity.

This study investigated the effects of once-a-day (OAD) and twice-a-day (TAD) milking strategies on Cheddar cheese properties, within an Irish pasture-based system. Cheese derived from OAD milk was more yellow, with significantly higher b* values and a significantly higher β-carotene content. A significantly higher cheese yield also resulted from OAD milk. Compositional data were largely consistent with previously reported results, and no meaningful differences were found in texture, proteolysis, pH, volatile-organic-compounds and free-fatty-acid profile. Indications are that OAD milking does not negatively impact Cheddar quality, providing valuable insights for those considering milking frequency impacts on this key dairy product.

To enhance camel milk production, some breeders have transitioned from extensive to semi-intensive breeding systems. This study investigates the effects of this transition on casein fractions by analyzing milk samples of targeted breeding. Various parameters, such as pH, Dornic acidity, dry matter, ash, total proteins, whey proteins, and caseins, were examined. The results revealed that semi-intensive camel milk exhibited increased acidity and lower mineral content, while demonstrating significant elevations in total proteins, whey proteins, and particularly caseins. Transition to semi-intensive system increased κ, β, and αs1-caseins levels by 0.44, 4.85, and 1.81 g/L, respectively, as observed after FPLC, SDS-PAGE, and MALDI-ToF characterization.

The distribution of mycotoxins during cheese production and storage is a complex process that depends on several factors, including milk quality, cheese type, storage conditions, and the presence of competing microorganisms. This paper investigates the occurrence and distribution of mycotoxins in curd/cheese/whey during different cheese processes and the effect of ripening/storage time on mycotoxin levels in the final product using a review approach. The paper covers the major mycotoxins that can contaminate cheese, including aflatoxins, ochratoxin-A, roquefortine-C, mycophenolic acid, and beauvericin. Overall, it synthesises the existing understanding of the spread of mycotoxins during cheese production and storage.

The study determined the impact of pressing time (12, 18 and 24 h) of fresh goat cheese on sensory attributes and their correlation with consumers' cognitive aspects (emotions and memories). Consumers (n = 100) performed the check-all-that-apply technique to identify sensory attributes, emotions and memories. Pressing for 12 and 24 h evoked eight positive emotions and nine positive memories that were correlated (r > 0.95) with sensory attributes, particularly (milk-aroma, butter-flavour, milk-flavour and milk skin-flavour). However, pressing for 18 h evoked negative emotions and negative memories. Information from this study may be useful for the development of acceptable fresh goat cheese products.

Conjugated linoleic acid (CLA) is recognised for its health benefits: anticancer, antiinflamatory and antiatherogenic effects have been reported. CLA enriched yoghurts were developed through homogenization at two levels (H1 and H2 with 40 and 80 mg CLA/100 g of yoghurt, respectively) with a view to creating functional foods. CLA modified the volatile profile in a positive way: higher levels of diacetyl and ethyl butanoate and lower values of 2-hexanone and 2-heptanone, ethanol and certain acids were recorded. Yoghurts presented similar microstructure, but H1 showed higher consistency and lower pseudoplastic behaviour; meanwhile H2 presented less syneresis. All products had high acceptability.

Common factors influencing the survival of microbes to spray drying include microbial intrinsic resistance, properties of the carrier, inlet and outlet temperatures, and rate of feeding. In this work, cheese whey was used as both a growth medium and a carrier for spray drying of Bifidobacterium animalis subsp. lactis INL1. The growth of the strain was favoured by acid conditions, reaching higher counts when pH was not controlled during fermentation and when pH was controlled at a constant value of 5.5, compared with 6.5. Powders containing ca. 9 log order (cfu/g) of B. lactis INL1 were obtained by direct spray drying of the culture coming out of the fermenter. No differences in survival to spray drying were observed in terms of fermentation conditions. However, fermentation conditions are considered to have influenced the strain's survival along the storage. Spray drying in acid conditions was detrimental to the survival along storage.