Abstract:In order to describe the kinetics of rennet coagulation, measurements
of
turbidity as a function of wavelength were used to determine the weight-average
degree of polymerization, x¯w,
during renneting of milk at three different concentrations
of enzyme and three concentrations of casein, including the normal casein
concentration of milk. The change of x¯w
as a function of time was described using Von
Smoluchowski's equation, testing a number of expressions for the aggregation
rate
constant, kij. The … Show more
“…Within image analysis procedures, the laser-backscattering imaging characterizes the extinction of light transmittance across a changing magnitude measured in a given matrix. This principle has already been used to monitoring curdling process but in a classical optical turbidimetry approach (Lomholt et al, 1998) which presented limitations such as a dilute sample of milk is necessary. Laser-backscattering imaging follows that principle, but applying a more powerful light source, imaging analysis and data mining techniques for studding the diffraction patterns generated because milk matrix-light interactions.…”
Section: Most Of the Instrumental Methods Work By Destructive Procedu...mentioning
“…Within image analysis procedures, the laser-backscattering imaging characterizes the extinction of light transmittance across a changing magnitude measured in a given matrix. This principle has already been used to monitoring curdling process but in a classical optical turbidimetry approach (Lomholt et al, 1998) which presented limitations such as a dilute sample of milk is necessary. Laser-backscattering imaging follows that principle, but applying a more powerful light source, imaging analysis and data mining techniques for studding the diffraction patterns generated because milk matrix-light interactions.…”
Section: Most Of the Instrumental Methods Work By Destructive Procedu...mentioning
“…The caseinomacropeptide (CMP) part of κ casein and also the mineral equilibria between casein micelles and the diffusible phase play a prominent part in micelle stability [8,12,13]. The release of CMP from κ casein by rennet, and the solubilisation of the colloidal calcium phosphate by starter acidification of milk [5,6,15,18] allow a decrease of the stabilizing energetic barrier between casein micelles [21], allowing thereby a closer contact between micelles leading to the formation of a solid network entrapping the aqueous phase.…”
-The kinetics of whey drainage of Camembert soft cheese was studied using an instrumented drainage device to record the pH and the weight of the whey with a variation coefficient amounting to 1.8% during the first 100 min and 0.34% at the end of drainage. Drainage data were fit with a two step equation to obtain a descriptive model of the drainage kinetics. The effect of the pH at renneting, the casein concentration and the ionic strength on the drainage kinetics was investigated with a 2 level experimental design. Milk was modified by a combination of ultrafiltration and dilution with a lactose solution. The pH at renneting had a negative effect on the amount of whey expelled in the early drainage (up to 100 min) and a positive one after 400 min. The effect of the casein concentration was negative on the amount of whey expelled and on the rate of drainage. The ionic strength had a slight positive effect on drainage.
“…The role of micelles on hydrolysis has also been discussed in various studies on hydrolysis of k-casein by chymosin (van Hooydonk et al, 1984;Hyslop, 2003;Lomholt & Qvist, 1997;Lomholt et al, 1998;Saputra et al, 1994). In such cases, k-casein was present in micelles, complex structures containing all types of caseins.…”
Section: Effect Of Initial Protein Concentration On the Kinetic Modelsmentioning
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.