Stabilizers in aerated dairy foams:

• Carrageenan (specifically $\kappa$-carrageenan, INS 407) is an anionic sulfated galactan extracted from red seaweed (Rhodophyta). It is officially permitted under FSSAI regulations (Food Safety and Standards Regulations, 2011) as a stabilizing and thickening agent in cream and whipped cream products (at levels up to $0.015\text{--}0.03\%$). It interacts electrostatically with $\kappa$-casein to prevent serum separation (wheying-off) and stabilize foam air cells.
• Starch is considered an unauthorized filler/adulterant in standardized whipped cream.
• Sodium citrate is an emulsifying salt used in processed cheese.
• Calcium chloride is a coagulation aid in cheese.

Deteriorative factors in dried milk powders:

• Fat content directly determines oxidative susceptibility: whole milk powder ($26\%\text{ fat}$) oxidizes rapidly compared to skim milk powder ($\lt 1.5\%\text{ fat}$).
• Initial moisture content controls water activity ($a_w$); moisture $\gt 4.0\%$ accelerates lactose crystallization, caking, and rapid Maillard browning.
• Storage temperature governs reaction kinetics of lipid oxidation and protein insolubilization ($Q_{10} = 2\text{--}3$).
• Bulk density ($g/ml$) is a physical packaging property that affects shipping container volume, flowability, and package sizing; it has NO direct chemical or microbiological role in dictating the keeping quality or biochemical degradation rates of dried milk.

Cellular and physiological sources of indigenous milk enzymes:

• Blood plasma: Enzymes transudate directly from bovine bloodstream across mammary tight junctions into milk (e.g., plasminogen/plasmin, catalase, thrombin).
• Milk fat globule membrane (MFGM): Derived from the apical plasma membrane of mammary epithelial cells during secretion, carrying high concentrations of xanthine oxidase, alkaline phosphatase, and 5'-nucleotidase.
• Somatic cells: Leukocytes and sloughed epithelial cells lyse to release intracellular lysosomal enzymes (acid phosphatase, catalase, esterases).
• Casein micelle: A self-assembled supramolecular protein-mineral complex composed of $\alpha_{s1}, \alpha_{s2}, \beta, \kappa$-caseins and colloidal calcium phosphate. It is a product structure, NOT a biological or cellular source of enzymes (although some enzymes like plasmin associate with it, the micelle itself is not the source).