Acid gelation of colloidal calcium phosphate-depleted preheated milk

Marie-Hélène Famelart; Géraldine Gauvin; Denis Pâquet; Gérard Brulé

doi:doi:10.1051/dst/2009014

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Volume 89 / No 3-4 (May-August 2009)

Dairy Sci. Technol., 89 3-4 (2009) 335-348

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Table I.

Physicochemical characteristics of milk samples during dialysis against a weak cation exchanger. D2 and D3 are two repetitions of the dialysis experiment. t_dialysis, time of dialysis; WP, whey proteins; t_gel, gelation time; pH_gel, gelation pH; tanδ_min, minimum value of tanδ just after gelation; tanδ₈₀₀, tanδ at 800 min; Δtan, difference between maximal and minimal value of tanδ; G′₈₀₀, G′ at 800 min; tanδ₈₀₀, tanδ at 800 min.

	t_dialysis (h)	ζ-potential (mV)		Casein (g·kg⁻¹)	WP (g·kg⁻¹)	NPN (g·kg⁻¹)	t_gel (min)	pH_gel	tanδ_min	tanδ₈₀₀	Δtan	G′₈₀₀ (Pa)	tanδ₈₀₀
	t_dialysis (h)	NH^*	H^*	Casein (g·kg⁻¹)	WP (g·kg⁻¹)	NPN (g·kg⁻¹)	t_gel (min)	pH_gel	tanδ_min	tanδ₈₀₀	Δtan	G′₈₀₀ (Pa)	tanδ₈₀₀
D2	0	−20.4 ± 0.9^a^A^χ	−18.3 ± 0.3^a^B^ε	39.37 ± 1.04	8.55 ± 0.10	2.37	209.5	5.33	0.338	0.406	0.070	854	0.2161
	14.5	−19.8 ± 0.8^a^b^A	−17.1 ± 0.7^b^B	39.34 ± 0.01	8.30 ± 0.10	2.14	225.6	5.31	0.375	0.453	0.078	643	0.2447
	22.08	−18.9 ± 0.8^b^d^A	−15.6 ± 0.6^c^B	34.64 ± 0.07	8.00 ± 0.03	2.00	226.1	5.40	0.393	0.467	0.074	619	0.2411
	38.42	−16.8 ± 0.8^c^e^A	−15.3 ± 0.5^c^B	33.91 ± 0.24	8.53 ± 0.01	1.67	247.8	5.41	0.417	0.492	0.075	650	0.2516
	43.08	−17.8 ± 0.7^d^e^A	−15.9 ± 0.5^c^B	33.79 ± 0.24	8.81 ± 0.04	1.34	240.0	5.34	0.429	0.500	0.071	714	0.2462
D3	0	−18.5 ± 0.5^a^A^φ	−17.0 ± 0.8^a^B^λ	36.12 ± 4.23	9.47 ± 0.02	2.23	215.7	5.34	0.336	0.406	0.070	839	0.2215
	14.25	−18.7 ± 0.8^a^A	−17.4 ± 1.1^a^A	35.10 ± 0.10	8.93 ± 0.03	1.90	228.7	5.57	0.384	0.453	0.069	764	0.2453
	21.75	−18.5 ± 0.7^a^A	−16.2 ± 0.7^a^B	34.82 ± 3.89	8.86 ± 0.01	1.80	237.5	5.16	0.398	0.470	0.073	651	0.2421
	38.26	−17.5 ± 0.8^b^A	−14.4 ± 0.9^b^B	33.70 ± 4.08	8.59 ± 0.01	1.57	358.1	5.10	0.447	0.513	0.066	702	0.2735

^*

NH, non heat-treated; H, heat-treated.

^abcde

Mean of sample in a column obtained by one dialysis experiment (D2 or D3) with different superscripts differ significantly (P < 0.05%).

^AB

Mean of samples on the same row with different superscripts differ significantly (P < 0.05%).

^χεφλ

Mean of samples at zero time dialysis with different superscripts differ significantly (P < 0.05%).