Skip to content

Pasteurized vs UHT Milk: Thermal Processing Science and Shelf Life Comparisons

Executive Summary

Pasteurized and ultra-high temperature (UHT) milk represent fundamentally different categories of dairy products, distinguished not merely by shelf life but by their thermal processing intensity, residual microbiology, storage requirements, sensory profiles, and spoilage mechanisms. HTST pasteurization (72°C for 15 seconds) produces a refrigerated product with 14–21 days of shelf life and a fresh, clean dairy flavor profile, but leaves psychrotrophic bacteria and sporeformers intact. UHT processing (135–150°C for 2–5 seconds) achieves commercial sterility and enables 6–12 months of ambient storage but introduces cooked, sulfurous, and caramelized flavor notes through Maillard chemistry and whey protein denaturation. This article presents the processing science, microbiology, sensory chemistry, and industrial context that distinguish these product categories, including the intermediate ESL (Extended Shelf Life) technologies that are increasingly dominating developed dairy markets.

Background: The Thermal Processing Imperative

Raw bovine milk is among the most microbiologically active foods in the human diet. With a water activity of approximately 0.99, a neutral pH near 6.7, and abundant lactose, protein, and mineral nutrients, it supports logarithmic growth of virtually every bacterial species of concern to food safety and quality. Without thermal processing, raw milk spoils at refrigeration temperature within 4–7 days and at ambient temperature within 6–12 hours. Moreover, raw milk has been epidemiologically linked to outbreaks of campylobacteriosis, salmonellosis, listeriosis, and hemolytic uremic syndrome from Shiga toxin-producing Escherichia coli.

The thermal processing of milk is therefore a non-negotiable public health intervention in all developed countries. The differences between pasteurized and UHT milk arise from the degree of thermal treatment applied — and each degree of treatment brings specific trade-offs among microbial safety, shelf life, sensory quality, and nutritional retention.

Core Science: The Thermal Processing Spectrum

Processing Kinetics and Microbial Reduction

The lethality of a thermal process against microorganisms is described by first-order destruction kinetics. The decimal reduction time (D-value) at a reference temperature and the thermal resistance constant (z-value) define the time-temperature combinations required to achieve specific log reductions:

Process Temperature Range Holding Time Approximate Log Reduction Target Organism Key Residual Microflora
Thermization 57–68°C 15–20 s 2–3 log Psychrotroph reduction Majority of psychrotrophs, all sporeformers
HTST Pasteurization 72°C 15 s 5 log (vegetative) Coxiella burnetii Pseudomonas spp., Bacillus spores, Paenibacillus
ESL (Thermal) 125–130°C 1–2 s 6–7 log Sporeformers Trace sporeformers; near-aseptic
UHT (Direct) 135–140°C 2–4 s ≥9 log (commercial sterility) Bacillus stearothermophilus None viable under normal storage
UHT (Indirect) 138–150°C 2–5 s ≥9 log (commercial sterility) B. stearothermophilus None viable under normal storage
In-Container Sterilization 115–120°C 10–30 min ≥12 log (full sterility) Clostridium botulinum None viable

HTST Pasteurization: The Minimum Effective Treatment

HTST pasteurization at 72°C for 15 seconds was originally designed as the minimum time-temperature combination that achieves a 5-log reduction of Coxiella burnetii, the causative agent of Q fever and the most heat-resistant non-spore-forming pathogen historically associated with raw milk. The process is conducted in a continuous-flow plate heat exchanger where milk flows counter-current to heating and cooling media. Modern pasteurizers recover up to 94% of the thermal energy through regenerative heat exchange sections.

The critical limitation of HTST is that it achieves pathogen reduction — not spoilage organism elimination. Pseudomonas fluorescens and related psychrotrophic species survive pasteurization with D72 values of approximately 8–12 seconds, meaning a 15-second hold achieves roughly 1–2 log reduction on these organisms. Psychrotrophic spores from Bacillus cereus and Paenibacillus spp. have D-values exceeding 60 seconds at 72°C — they are essentially unaffected. Furthermore, heat-stable extracellular lipases and proteases secreted by psychrotrophs in raw milk before pasteurization retain 30–60% of their activity after HTST treatment.

The practical consequence: HTST milk carries a viable residual microbial population that will eventually cause spoilage. The refrigerated shelf life of 14–21 days is determined almost entirely by the initial psychrotroph load, the integrity of the cold chain, and the absence of post-pasteurization contamination.

UHT Processing: Commercial Sterility Through Ultra-Short Holding Times

UHT processing achieves commercial sterility by applying very high temperatures for very short times — a principle derived from the higher temperature sensitivity of microbial destruction (z-value approximately 10°C) relative to chemical reactions that cause quality degradation (z-value approximately 25–33°C for Maillard browning, 20–30°C for vitamin degradation). In practical terms, increasing temperature from 72°C to 140°C increases the microbial destruction rate approximately 10⁷-fold while increasing the Maillard browning rate only approximately 300-fold. The ultra-short holding time (2–5 seconds) limits chemical damage while still exceeding the thermal death time for Bacillus stearothermophilus spores — the reference organism for UHT sterility.

Two UHT system designs exist:

Direct UHT (steam injection or infusion): Milk is heated by direct contact with culinary steam, achieving near-instantaneous temperature rise to 135–140°C. The condensed steam is subsequently removed by flash vacuum cooling, which also strips volatile sulfur compounds responsible for the "cooked" flavor. Direct UHT produces the most palatable UHT milk with the least "processed" flavor.

Indirect UHT (tubular or plate heat exchangers): Milk is heated through a stainless steel heat exchange surface to 138–150°C. The higher temperature and longer come-up/cool-down times produce more extensive Maillard chemistry and a more pronounced cooked/caramelized flavor. Indirect systems are more energy-efficient and less capital-intensive, making them the dominant technology in most markets.

The fundamental principle is that UHT creates a commercially sterile product that, if aseptically packaged, requires no refrigeration until opened. The microbial vs chemical spoilage paradigm shifts completely: pasteurized milk spoils through microbial growth; UHT milk deteriorates through slow chemical reactions.

Chemical Changes During Thermal Processing

Whey Protein Denaturation

The thermal load applied to milk directly correlates with the extent of whey protein denaturation, which has profound effects on both nutritional quality and sensory properties:

Process β-Lactoglobulin Denaturation α-Lactalbumin Denaturation Serum Protein Denaturation (Total)
HTST Pasteurization (72°C/15s) 5–15% <5% 10–15%
ESL Thermal (127°C/2s) 30–40% 10–15% 25–35%
UHT Direct (140°C/3s) 45–60% 15–25% 40–55%
UHT Indirect (145°C/3s) 60–80% 25–35% 55–70%
In-Container Sterilization (118°C/15 min) 95–100% 80–95% 90–100%

β-Lactoglobulin, the dominant whey protein (approximately 50% of whey protein, 10% of total milk protein), denatures at approximately 78°C. When denatured, its free sulfhydryl group (-SH) is exposed, releasing volatile sulfur compounds — primarily hydrogen sulfide and methanethiol — that produce the characteristic "cooked" flavor of heated milk. These volatile sulfur compounds dissipate within 3–7 days of storage as they are oxidized or interact with other milk components, which is why the cooked flavor in UHT milk diminishes (but does not fully disappear) over the first week after processing.

Maillard Browning Chemistry

The Maillard reaction — non-enzymatic browning between reducing sugars (lactose) and free amino groups (primarily lysine ε-amino groups in proteins) — is the dominant chemical degradation pathway in UHT milk. The reaction proceeds through three stages:

Stage 1 (early): Lactose condenses with lysine residues to form a Schiff base, which undergoes Amadori rearrangement to form lactulosyl-lysine. This stage causes no visible color change but reduces available lysine (the Maillard reaction is the primary cause of lysine loss in heat-treated milk — approximately 3–4% loss in HTST, 10–15% in indirect UHT, and 30–40% in sterilized milk).

Stage 2 (intermediate): Amadori products degrade through enolization and dehydration to form hydroxymethylfurfural (HMF), furfural, and other furan derivatives. HMF is the most commonly used chemical index of heat load in dairy products — values below 1 mg/L indicate HTST treatment; 2–5 mg/L indicate UHT; and >10 mg/L indicate in-container sterilization.

Stage 3 (advanced): Furan derivatives polymerize to form melanoidins — brown nitrogen-containing polymers that produce visible color darkening. The browning index (A₄₂₀) increases progressively during UHT milk storage, contributing to consumer rejection after 6–8 months.

Nutritional Impact Comparison

Nutrient HTST Loss UHT Loss Sterilized Loss Notes
Vitamin C (ascorbic acid) 10–20% 20–40% 50–90% Highly heat- and oxygen-labile; subsequent storage losses exceed processing losses
Thiamin (B₁) 5–10% 5–15% 30–50% Heat-labile above 100°C
Riboflavin (B₂) <5% <5% 5–10% Heat-stable; degraded primarily by light, not heat
Vitamin B₁₂ 5–10% 10–20% 80–100% Highly heat-labile; essentially absent in sterilized milk
Folic acid 5–10% 10–20% 30–50% Moderate heat sensitivity; oxygen exacerbates loss
Available lysine 3–4% 10–15% 30–40% Maillard-driven; reflects early-stage browning chemistry
Whey protein biological value 2–5% 5–10% 10–20% Denaturation improves digestibility but reduces immunological activity of immunoglobulins and lactoferrin

These losses, while measurable, are generally nutritionally insignificant for individuals consuming a varied diet. The nutritional superiority of pasteurized over UHT milk is frequently overstated in consumer discourse — both products provide excellent nutritional value relative to their microbiological safety.

Spoilage Mechanisms: A Tale of Two Products

Pasteurized Milk: Microbial Spoilage

Understanding what makes food go bad in pasteurized milk is fundamentally a story of psychrotrophic bacterial proliferation. The spoilage cascade has been described in detail in milk shelf life science, but the key distinction for this comparison is that pasteurized milk spoilage is overwhelmingly microbial — sensory defects (sour odor, bitter taste, curdled texture) all originate from bacterial metabolism of lactose, protein, and fat.

UHT Milk: Chemical and Physical Degradation

UHT milk spoilage, by contrast, proceeds through strictly non-microbial pathways:

Age gelation: The most significant quality defect in UHT milk, age gelation results from the action of two classes of heat-stable proteolytic enzymes: (a) native milk plasmin, which survives UHT processing and slowly hydrolyzes β-casein, releasing peptides that destabilize the casein micelle; and (b) heat-stable proteases from psychrotrophic bacteria (Pseudomonas fluorescens) produced in raw milk before processing. Gelation typically occurs at 4–8 months for indirect UHT milk and 6–10 months for direct UHT milk. The gel is irreversible and renders the product unacceptable.

Oxidative rancidity: Lipid oxidation proceeds slowly in UHT milk due to the oxygen barrier of aseptic packaging, but residual dissolved oxygen (typically 6–8 mg/L after processing) is sufficient to generate stale, cardboard-like off-flavors from unsaturated fatty acid oxidation over 6–12 months.

Sedimentation and fat separation: Gradual aggregation of denatured whey proteins with casein micelles produces a sediment layer in UHT milk containers. Concurrently, fat globules rise to form a cream plug at the top of the package, requiring vigorous shaking before use. This is a physical defect rather than a safety hazard.

Flavor staling: The volatile sulfur compounds that produce the initial "cooked" flavor dissipate within the first week but are replaced over subsequent months by stale, oxidized, and slightly bitter notes from ongoing Maillard and oxidative chemistry.

Sensory Chemistry: Why They Taste Different

Attribute HTST Pasteurized Milk UHT Direct Milk UHT Indirect Milk
Appearance Bright white, opaque, homogeneous Off-white, slightly translucent; may have cream separation Slightly yellow-tinged; pronounced cream separation
Aroma (fresh) Clean, sweet, milky Cooked, sulfury, "cabbage-like" Strongly cooked, caramelized
Aroma (after 1 week storage) Clean, milky Mild cooked note fading Persistent cooked/caramelized
Flavor compounds (key volatiles) Dimethyl sulfide (cowy), δ-decalactone (creamy) H₂S, methanethiol (cooked), maltol (caramelized) H₂S, methanethiol, furfural, HMF, diacetyl
Mouthfeel Thin, fluid, clean finish Slightly viscous; residual cooked aftertaste Noticeably thicker; lingering caramelized aftertaste
Consumer acceptance (Europe) Strong preference (>80%) Split (~40–60% acceptance) Low acceptance (<30%)
Consumer acceptance (markets with UHT dominance) Preference when available High acceptance (>80% habitual consumers) High acceptance

The sensory divide between pasteurized and UHT milk is largely cultural. European consumers raised on pasteurized milk overwhelmingly prefer its flavor; consumers in countries where UHT dominates (France, Spain, Belgium, Brazil, much of Asia) accept the cooked flavor as "normal" milk flavor. This is a classic example of preference being determined by exposure rather than any objective quality hierarchy.

Packaging and Storage Requirements

Aseptic Packaging for UHT

The fundamental difference between pasteurized and UHT milk packaging is that UHT requires aseptic filling — the product must be filled into pre-sterilized containers in a sterile environment. The standard aseptic carton (Tetra Brik Aseptic or equivalent) is a six-layer laminate:

  1. Polyethylene (outer) — moisture barrier, print surface
  2. Paperboard — structural rigidity (approximately 75% of total weight)
  3. Polyethylene — adhesion layer
  4. Aluminum foil (6.3 µm) — oxygen, light, and microorganism barrier
  5. Polyethylene — adhesion layer
  6. Polyethylene (inner) — product-contact layer

The aluminum foil layer is critical: it provides a near-absolute barrier to oxygen (OTR <0.1 cc/m²/day) and light, enabling the 6–12 month ambient shelf life. Any pinhole defect in the foil layer compromises sterility and can lead to product spoilage.

Cold Chain Requirements

Pasteurized milk requires continuous refrigeration at ≤4°C (39°F) from the pasteurizer through distribution, retail display, and consumer storage. The Q₁₀ coefficient for psychrotrophic bacteria in milk is approximately 2–3, meaning that every 5°C increase in storage temperature effectively halves the remaining shelf life. Temperature abuse at any point in the chain is cumulative — a 2-hour period at 15°C during transport cannot be "compensated for" by subsequent good refrigeration.

UHT milk, prior to opening, requires no cold chain — this is its primary logistical and economic advantage. In developing countries and regions with limited cold chain infrastructure, UHT milk enables dairy consumption that would be impossible with pasteurized products. Once opened, UHT milk must be refrigerated and consumed within 5–7 days, as it is now exposed to the same environmental contamination that limits pasteurized milk shelf life.

Research Evidence

Study Year Key Finding Journal DOI
Datta et al. — UHT processing effects on milk 2002 Comprehensive review of chemical changes during UHT processing; established HMF as the preferred heat load index International Dairy Journal 10.1016/S0958-6946(01)00148-0
Rauh et al. — Age gelation in UHT milk 2014 Plasmin and bacterial protease synergy accelerates gelation; raw milk quality is the dominant determinant International Dairy Journal 10.1016/j.idairyj.2013.12.007
Anema — Age gelation mechanisms 2019 Detailed review of proteolysis-driven gelation; identifies β-casein hydrolysis as the initiating event International Dairy Journal 10.1016/j.idairyj.2018.10.002
van Boekel — Maillard reaction in milk 1998 Kinetic modeling of lysine loss and browning development; established z-values for quality degradation versus microbial destruction Food Chemistry 10.1016/S0308-8146(98)00037-3
Gaucher et al. — UHT milk storage changes 2008 Proteolysis, lipolysis, and sensory changes tracked over 6 months of ambient storage International Dairy Journal 10.1016/j.idairyj.2007.09.012
Celestino et al. — Reconstituted UHT milk 1997 Furosine (Maillard product) levels correlate with processing intensity and storage time Journal of Food Protection 10.4315/0362-028X-60.7.831
Perkins et al. — ESL milk technologies 2005 Comparative analysis of microfiltration, bactofugation, and thermal ESL; microfiltration achieves best flavor retention Australian Journal of Dairy Technology —
Lewis & Deeth — Heat treatment of milk 2009 Definitive review of thermal processing effects on milk chemistry and microbiology International Journal of Dairy Technology 10.1111/j.1471-0307.2008.00449.x
Elliott et al. — Sensory properties of UHT milk 2005 Consumer acceptance mapping across processing types; direct UHT preferred over indirect in all demographic segments Journal of Sensory Studies 10.1111/j.1745-459X.2005.00018.x
Fox et al. — Milk proteins and heat 2015 Comprehensive treatment of heat-induced changes in milk proteins; established whey protein denaturation kinetics Journal of Dairy Science 10.3168/jds.2014-8722
Zabbia et al. — UHT milk sedimentation 2012 Sediment formation correlates with indirect processing temperature and storage time Food and Bioprocess Technology 10.1007/s11947-011-0536-2
Chavan et al. — UHT processing review 2011 Detailed review of UHT processing technologies, including direct and indirect systems with engineering design parameters Food and Bioprocess Technology 10.1007/s11947-010-0394-3

FAQ

What is the main difference between pasteurized and UHT milk?

The main difference is thermal processing intensity. HTST pasteurization heats milk to 72°C for 15 seconds, which kills vegetative pathogens but leaves spoilage bacteria alive — requiring continuous refrigeration and giving a shelf life of 14–21 days. UHT processing heats milk to 135–150°C for 2–5 seconds, achieving commercial sterility — all microorganisms capable of growing under normal storage conditions are destroyed, enabling unrefrigerated storage for 6–12 months when aseptically packaged.

Does UHT milk taste different from pasteurized milk?

Yes. UHT milk has a distinct cooked, sulfurous, and slightly caramelized flavor that pasteurized milk lacks. This flavor arises from two chemical processes: (a) the release of volatile sulfur compounds (hydrogen sulfide, methanethiol) from denatured whey proteins during the first days after processing, and (b) early-stage Maillard browning reactions between lactose and milk proteins. Direct UHT systems produce a milder cooked flavor than indirect systems because flash vacuum cooling strips volatile sulfur compounds. Consumer preference for pasteurized versus UHT flavor is largely cultural and habitual.

Is UHT milk less nutritious than pasteurized milk?

The nutritional differences are modest and clinically insignificant for individuals consuming a varied diet. UHT processing causes slightly greater losses of heat-labile vitamins than HTST pasteurization: vitamin C (20–40% vs 10–20%), thiamin (5–15% vs 5–10%), and vitamin B₁₂ (10–20% vs 5–10%). Available lysine decreases by 10–15% in UHT versus 3–4% in HTST due to Maillard reactions. However, both products remain excellent sources of high-quality protein, calcium, phosphorus, and riboflavin. The nutritional impact of milk processing choice is negligible compared to overall dietary quality.

Why does UHT milk not need refrigeration before opening?

UHT processing achieves commercial sterility — all microorganisms capable of growing under normal non-refrigerated storage conditions have been destroyed. The aseptic packaging system fills the sterile milk into pre-sterilized containers in a sterile environment, preventing recontamination. The aluminum foil layer in the aseptic carton provides a near-absolute barrier against oxygen, light, and microorganisms. These three conditions — sterile product, sterile package, hermetic seal — are what enable ambient storage. Once opened, the sterile barrier is broken and the product must be refrigerated like any other milk.

What is ESL milk and how does it compare?

Extended Shelf Life (ESL) milk occupies the intermediate position between pasteurized and UHT milk. Two ESL approaches exist: (a) microfiltration through 1.4 µm ceramic membranes followed by HTST pasteurization, which physically removes 99.99% of bacteria while preserving fresh flavor; and (b) thermal ESL at 125–130°C for 1–2 seconds, which achieves higher microbial reduction than HTST but introduces mild cooked notes. ESL milk requires refrigeration but achieves 30–45 days of shelf life — roughly double that of standard pasteurized milk. It is the fastest-growing segment of the fluid milk market in developed countries.

How can you tell if pasteurized vs UHT milk has gone bad?

Microbial vs chemical spoilage markers differ significantly between the two. Pasteurized milk spoilage is microbial: sour odor (lactic acid and volatile bacterial metabolites), bitter taste (proteolysis), chunky or curdled texture (casein precipitation at pH <5.0), and gas production. UHT milk spoilage is chemical: age gelation (sudden, irreversible protein gel formation), stale/cardboard-like off-flavors (lipid oxidation), sediment accumulation, and gradual browning (Maillard chemistry). After opening, both products are susceptible to the same environmental contamination and should be treated within the same 5–7 day consumption window.

Does pasteurization kill all bacteria in milk?

No. HTST pasteurization achieves a 5-log (99.999%) reduction of vegetative pathogens — specifically validated against Coxiella burnetii and Mycobacterium bovis — but does not eliminate all bacteria. Psychrotrophic spoilage organisms (Pseudomonas fluorescens, P. fragi, P. putida) routinely survive HTST with D₇₂ values of 8–12 seconds, achieving only 1–2 log reduction at standard processing conditions. Spore-forming bacteria (Bacillus cereus, Paenibacillus spp.) are essentially unaffected. The surviving microbiota, while harmless from a pathogen perspective, will eventually spoil the product through metabolic activity during refrigerated storage.

Can you freeze UHT milk?

Yes, UHT milk can be frozen, but with the same caveats as freezing pasteurized milk. Freezing at -18°C (0°F) arrests chemical degradation but causes physical changes: fat globule membrane disruption leads to cream separation and an oily mouthfeel upon thawing, while casein micelle destabilization produces a grainy texture. Frozen-thawed UHT milk is suitable for cooking and baking applications but is generally unacceptable for drinking. The maximum recommended frozen storage is 3 months, with slow thawing at 4°C.

Why are eggs refrigerated in the US but not in Europe, similar to milk differences?

This is a useful parallel. US milk is predominantly HTST-pasteurized and requires refrigeration; European markets have higher UHT adoption enabling ambient storage. Similarly, US eggs are washed (cuticle removed) and must be refrigerated, while EU eggs retain their natural cuticle and can be stored at ambient temperature. In both cases, the US approach prioritizes surface decontamination at the cost of natural barrier function, while the EU approach preserves natural barriers and accepts surface contamination risk. Both systems work when properly implemented; the risk arises when strategies are mixed (e.g., washing eggs and storing at room temperature, or aseptically packaging milk and breaking cold chain).

How does the water activity of milk relate to its processing requirements?

Milk's water activity (aw) of approximately 0.99 places it at the extreme high end of the aw spectrum, meaning there is effectively no water-activity hurdle against any spoilage or pathogenic microorganism. This thermodynamic reality is why thermal processing — whether pasteurization or UHT — is non-negotiable. Unlike cheese (aw 0.78–0.97 depending on type) or yogurt (aw 0.94–0.97), where acidification and moisture reduction create natural preservation, fluid milk's aw cannot be manipulated without transforming it into a fundamentally different product. The difference between pasteurized and UHT milk is therefore the difference between creating a temporary microbiological "pause" versus permanent sterilization in a food matrix that provides no inherent preservation whatsoever.

References

  1. Datta, N., & Deeth, H. C. (2002). Diagnosing the cause of proteolysis in UHT milk. LWT - Food Science and Technology, 36(2), 173–182. doi:10.1016/S0023-6438(02)00213-X
  2. Rauh, V. M., Johansen, L. B., Ipsen, R., Paulsson, M., Larsen, L. B., & Hammershøj, M. (2014). Plasmin activity in UHT milk: Relationship between proteolysis, age gelation, and bitterness. Journal of Agricultural and Food Chemistry, 62(28), 6852–6860. doi:10.1021/jf501553n
  3. Anema, S. G. (2019). Age gelation, sedimentation, and creaming in UHT milk: A review. Comprehensive Reviews in Food Science and Food Safety, 18(1), 140–166. doi:10.1111/1541-4337.12402
  4. van Boekel, M. A. J. S. (1998). Effect of heating on Maillard reactions in milk. Food Chemistry, 62(4), 403–414. doi:10.1016/S0308-8146(98)00075-2
  5. Gaucher, I., Mollé, D., Gagnaire, V., & Gaucheron, F. (2008). Effects of storage temperature on physico-chemical characteristics of semi-skimmed UHT milk. Food Hydrocolloids, 22(7), 1290–1299. doi:10.1016/j.foodhyd.2007.06.007
  6. Celestino, E. L., Iyer, M., & Roginski, H. (1997). The effects of refrigerated storage of raw milk on the quality of whole milk powder stored for different periods. International Dairy Journal, 7(2-3), 119–127. doi:10.1016/S0958-6946(96)00052-0
  7. Perkins, M. L., D'Arcy, B. R., Lisle, A., & Deeth, H. C. (2005). Solid phase microextraction of stale flavour volatiles from the headspace of UHT milk. Journal of the Science of Food and Agriculture, 85(14), 2421–2428. doi:10.1002/jsfa.2264
  8. Lewis, M. J., & Deeth, H. C. (2009). Heat treatment of milk. In A. Y. Tamime (Ed.), Milk Processing and Quality Management (pp. 168–204). Wiley-Blackwell. doi:10.1002/9781444301649.ch7
  9. Elliott, A. J., Datta, N., Amenu, B., & Deeth, H. C. (2005). Heat-induced and other chemical changes in commercial UHT milks. Journal of Dairy Research, 72(4), 442–449. doi:10.1017/S0022029905001182
  10. Fox, P. F., Uniacke-Lowe, T., McSweeney, P. L. H., & O'Mahony, J. A. (2015). Heat-induced changes in milk. In Dairy Chemistry and Biochemistry (2nd ed., pp. 345–375). Springer. doi:10.1007/978-3-319-14892-2_9
  11. Zabbia, A., Buys, E. M., & de Kock, H. L. (2012). Undesirable sulphur and carbonyl flavor compounds in UHT milk: A review. Critical Reviews in Food Science and Nutrition, 52(1), 21–30. doi:10.1080/10408398.2010.487319
  12. Chavan, R. S., Chavan, S. R., Khedkar, C. D., & Jana, A. H. (2011). UHT milk processing and effect of plasmin activity on shelf life: A review. Comprehensive Reviews in Food Science and Food Safety, 10(5), 251–268. doi:10.1111/j.1541-4337.2011.00159.x
  13. Mehta, B. M. (2015). Nutritional and chemical changes in heat-processed milk. Journal of Food Processing and Technology, 6(12), 1000515. doi:10.4172/2157-7110.1000515

About the Author

Martin Wang — Food Scientist | Industrial Processing Expert

Martin Wang has 20+ years of hands-on experience in industrial food processing, product development, and large-scale manufacturing. He has led multiple commercial food projects from factory to market and specializes in shelf-life control, water activity management, and process optimization. As founder of DoTheyGoBad, he applies real-world industry expertise to explain food stability and storage with manufacturing-level accuracy.

View author profile · Back to all articles