PAC
Anti-Freezing Power
Measures freezing point depression at −18 °C. Determines how soft, scoopable, and smooth gelato remains in the freezer.
PAC = Σ (Sugar grams × Sugar PAC coefficient) / Total Weight × 100
Technical Glossary · Gelato Science & Balancing
Core Concepts of Artisanal Gelato Science
Detailed definitions, mathematical formulas, and scientific explanations of physico-chemical parameters, functional ingredients, equipment, and manufacturing processes in artisan gelato.
POD
Sweetening Power
Measures perceived sweetness on the palate relative to sucrose (100). Prevents gelato from tasting cloying.
POD = Σ (Sugar grams × Sugar POD coefficient) / Total Weight × 100
MSNF
Milk Solids Non-Fat
Proteins, lactose, and minerals from milk and skim milk powder. Stabilizes air bubbles without exceeding 11.5%.
MSNF% = Total Milk Solids Non-Fat / Total Weight × 100
1. Scientific Parameters & Balancing Metrics
The key indices used to regulate firmness, freezing point, and sweetness.
Term Technical Explanation
PAC (Anti-Freezing Power) Indicates how much sugars, alcohol, and salt lower the freezing point of water in the mix. In a freezer at −18 °C, it prevents gelato from turning into a rock-hard ice block, keeping it soft and easy to serve.
POD (Sweetening Power) Measures perceived sweetness relative to sucrose, which equals 100. Helps in choosing sugars without making the gelato overly sweet.
MSNF / SLNG (Milk Solids Non-Fat) The dry part of milk excluding fat: proteins, lactose, and minerals. Adds structure and helps incorporate air; if it exceeds 11–12%, gelato can turn sandy due to lactose crystallization.
Total Solids (Dry Residue) The sum of all non-aqueous ingredients (fats, sugars, proteins, fibers, stabilizers). Typically ranges from 30% to 42% of the gelato's total weight.
Overrun Percentage of air incorporated into the mixture during churning. Air makes gelato softer, warmer on the palate, and slows down melting.
Cryoscopic Point Temperature at which free water in the mixture begins to turn into ice crystals.
2. Thickeners, Stabilizers & Structuring Agents
Hydrocolloids and plant fibers that bind free water and prevent the formation of large crystals.
Term Technical Explanation
Gelato Neutral (Stabilizer Blend) A balanced blend of plant hydrocolloids — usually locust bean gum, guar, and/or tara — used in very small quantities (0.3% to 0.5%). It binds free water and prevents large ice crystals from forming during storage.
Locust Bean Gum (E410 / LBG) A natural thermoreversible thickener extracted from carob seeds. Only activates above 80–85 °C, when it hydrates and reaches maximum viscosity. Perfect for pasteurized milk-based gelato.
Guar Gum (E412) Derived from the guar plant. Hydrates and develops viscosity cold, without needing heating. Ideal for fresh fruit sorbets and syrups.
Tara Gum (E417) An intermediate stabilizer between locust bean and guar. Dissolves well hot and partially hydrates cold, imparting a velvety creaminess and reducing syneresis (liquid separation).
Pectin A natural polysaccharide found in fruit peel and pulp. Mainly used hot for sorbets or creams based on acidic purees, as it binds water and stabilizes texture.
Maltodextrins Low-sweetness carbohydrates (POD 20) that add dry solids and body to the mix without making it sweeter or altering the freezing point too much.
3. Technical Sugars & Sweeteners
Monosaccharides, disaccharides, and polyols used to regulate perceived sweetness, texture, and elasticity.
Term Technical Explanation
Sucrose Common table sugar extracted from cane or beet, with POD 100 and PAC 100. Represents the primary source of solid sugar.
Dextrose Monohydrate Simple crystalline sugar derived from starch. Has a lower sweetening power (POD ~70) but almost double the anti-freezing power of sucrose (PAC 190). The key ingredient for keeping gelato soft at −18 °C without making it overly sweet.
Invert Sugar Syrup made of equal parts glucose and fructose, obtained by hydrolysis of sucrose. Has high sweetening power (POD 130) and strong anti-freezing power (PAC 190); makes the mixture more elastic and retains moisture.
Glucose Syrup (30–40 DE) Liquid sugar with calibrated dextrose equivalence. Increases gelato plasticity, reduces recrystallization, and controls melting.
Pure Fructose Natural sugar with very high sweetening power (POD 130–140) and PAC 190. Must be dosed carefully so as not to overpower other ingredient aromas.
Erythritol Zero-calorie polyol used in keto and low-calorie recipes. Has a POD around 70 and a very high PAC (~280), significantly lowering the freezing point and providing an endothermic cooling sensation on the palate.
4. Dairy & Protein Fractions
Sources of healthy fats, emulsifying proteins, and non-fat milk solids.
Term Technical Explanation
Skim Milk Powder (SMP) Concentrated powder obtained by dehydrating skimmed milk (~1% fat, ~52% lactose, ~36% protein). The preferred ingredient to boost non-fat solids (MSNF) and bind water without adding fat.
Whole Milk Powder (WMP) Dehydrated powder with about 26% fat and 70% MSNF. Used less often than skim milk powder because fats tend to oxidize and turn rancid over time.
Fresh Cream 35% Fresh cow's milk cream, obtained by centrifugation or settling, containing about 35% fat. The main source of quality fats to carry flavors and give gelato a well-rounded mouthfeel.
Lactose The natural disaccharide in milk. Has low sweetening power (POD 16) and low water solubility. In excessive amounts, it can crystallize into insoluble micro-needles perceived as sandiness on the palate.
5. Home Gelato Equipment & Tools
Mechanical appliances and measuring tools for professional results at home.
Term Technical Explanation
Self-Refrigerating Gelato Maker (with Compressor) A gelato machine with an integrated gas cooling circuit. Continuously cools the bowl (fixed or removable) while the paddle churns, requiring no pre-freezing of parts.
Freezer Bowl Gelato Maker An entry-level machine with a double-insulated cooling bowl. The bowl contains eutectic liquid that must be frozen in the freezer at −18 °C for 18–24 hours before use.
Micro-Milling Machine (e.g. Ninja Creami) Does not churn cold liquid mixes. Instead, transforms a solid block already frozen at −18 °C into a creamy texture using high-speed spinning blades that vertically shave through the mass.
Precision Scale (0.01 g) An essential milligram scale for weighing thickeners, stabilizers, and neutral blends (dosed at 3–5 g per kg). An error of just 1–2 g can spoil viscosity, making gelato gummy.
Immersion Blender (High-Speed Stick Blender) Essential during homogenization after heating or before churning. Micronizes fat globules and helps create a stable emulsion between water and fat phases.
Food Probe Thermometer Instant-read digital thermometer, indispensable for monitoring critical temperatures: incorporating powders at 35–40 °C, pasteurization and hydration at 82–85 °C, rapid cooling to +4 °C.
Optical / Digital Refractometer (°Brix Scale) Instrument used to measure soluble sugar concentration (°Brix) in fresh fruit or syrups, allowing balance adjustments before churning.
6. Processing Phases & Cold Chemistry
Physical and thermal steps from pasteurization to churning and storage.
Term Technical Explanation
Pasteurization Thermal treatment, usually at 82–85 °C for 2 minutes, to eliminate bacteria, dissolve sugars, and activate hot thickeners.
Cold Aging Resting the mix in the refrigerator at 4 °C for 6–12 hours. Allows milk proteins to hydrate, fats to crystallize, and stabilizers to build the network needed to maximize overrun.
Batch Freezing / Churning (Mantecazione) Combined process of dynamic cooling, bowl scraping, and mechanical agitation, during which water freezes into microcrystals while air is incorporated.
Syneresis Undesirable separation and expulsion of water or whey from gelato during storage, caused by insufficient stabilizers or imbalanced solids.
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