Sous Vide Precision Temperature Reference

Muscle proteins denature in stages: myosin begins to firm around 50°C (122°F), actin around 65–67°C (149–153°F). Cooking between these two thresholds — the sous vide sweet spot for most red meat — produces firm but still very juicy results because actin, which holds the most water, has not contracted. Fish proteins are more delicate; salmon myosin begins denaturing near 38°C (100°F), with translucent, butter-textured flesh at 40–45°C (104–113°F) and fully opaque, flaky results at 55°C (131°F). Eggs present the most nuanced case: yolk and white proteins denature at different rates and temperatures (white ovalbumin sets at 80°C / 176°F, yolk lipoproteins at ~65°C / 149°F), enabling the 63°C egg with flowing yolk and just-set white. Vegetables benefit from the 83–85°C range (181–185°F) where pectin enzymes denature before softening, producing a firm-tender texture impossible to achieve with boiling.

• Red meat at 54–57°C: deep pink throughout, velvety-soft with a slight resistance — uniformly medium-rare edge to edge
• Chicken breast at 60–63°C: white throughout with very slight translucency at center, extremely juicy — unlike the chalky result from traditional cooking
• Salmon at 45–50°C: translucent coral with a custard-like texture that flakes only gently under pressure
• Eggs at 63–65°C: white barely set and jiggly, yolk viscous and flowing like heavy cream
• Vegetables at 83–85°C: tender but with noticeable structural resistance — bends before breaking

• The bath temperature IS the final internal temperature; no thermometer needed for time-equilibrated food
• Confirm equilibration: thin items (2cm) equilibrate in 30–45 minutes; 4cm items need 1.5–2 hours
• For pasteurization, consult FDA time-temperature tables — holding time varies inversely with temperature (e.g. chicken safe at 60°C for 4 minutes, 63°C for 1 minute, 74°C instantly)
• Sear immediately after the bath and before serving; do not re-chill and re-sear as this affects moisture
• Ice-bath chill (0–1°C) immediately if not serving within 10 minutes — bag stays sealed until service

Sous vide food exits the bath at its target temperature already. A brief high-heat sear (30–60 seconds per side in a cast-iron pan or with a torch) adds Maillard crust with minimal internal temperature rise (+1–2°C). Account for this: set the bath 1–2°C below the desired final eating temperature if a hard sear follows.

• Myosin and actin denaturation temperatures

  The two principal contractile proteins in muscle, denaturing at different temperatures; sous vide exploits the gap between them

• Pasteurization by time-temperature

  The basis for sous vide food safety; lower temperatures require proportionally longer holding times to achieve the same log reduction

• Maillard reaction at sear stage

  High-heat surface browning applied post-bath; adds flavor crust without altering internal temperature significantly

• Collagen-to-gelatin conversion

  Requires sustained temperatures above 70°C (158°F) for hours; sous vide can achieve this at 72–80°C for tough cuts over 24–48 hours

• Carry-over cooking

  Minimal in sous vide compared to oven or grill; sear adds only 1–2°C at the surface

1. 1.Modernist Cuisine — Nathan Myhrvold, Chris Young & Maxime Bilet (The Cooking Lab, 2011)
2. 2.Under Pressure: Cooking Sous Vide — Thomas Keller (Artisan, 2008)
3. 3.Douglas Baldwin's Practical Guide to Sous Vide Cooking (online reference, 2010–2020)
4. 4.USDA Time-Temperature Tables for Cooking Meat and Poultry Products (FSIS, 2017)

Confidence: high