Sweet Taste¶

Sweet taste is one of the five basic tastes detected by ../Taste Buds, signalling the presence of sugars and other sweet-tasting compounds. In coffee, sweetness is a critical quality indicator and one of the ten attributes scored on the SCA Cupping Form.

Biological Basis¶

Sweet Taste Receptors¶

../Taste Receptors: - T1R2 and T1R3 receptor combination - Located on taste bud cells - Distributed across entire tongue - Particularly responsive to sugars

Detection Mechanism: - Sweet molecules bind to receptors - G-protein signalling cascade - Neural signal to brain - Perceived as pleasant, desirable

Evolution: - Signals calories/energy - Survival advantage - Universal preference (especially children) - Cultural modulation of preference

Compounds Detected¶

Sugars: - Sucrose (table sugar) - Fructose (fruit sugar) - Glucose - Maltose - Lactose (in milk drinks)

In Coffee: - Residual sugars from cherry - Developed through Maillard Reaction - Caramelisation products - Perceived sweetness vs. actual sugars

Other Sweet Compounds: - Some amino acids - Certain proteins - Artificial sweeteners (not in pure coffee) - Chlorogenic acid lactones

Sweetness in Coffee¶

Sources of Sweetness¶

From the Cherry: - Natural fruit sugars - Ripeness dependent - Processing method affects retention - Variety influences sugar content

From Roasting: - Caramelisation of sugars - Maillard reaction products - Melanoidins - Development level critical

Perceived Sweetness: - Not always actual sugars - Balance with acidity and bitterness - Lack of defects enhances perception - Clean cup contributes

Sweetness Development¶

In Growing: - Full ripeness = more sugars - Altitude affects sugar accumulation - Stress can reduce sugars - Variety genetic potential

In Processing: - Natural process: fruit sugars - Honey process: mucilage sugars - Washed: clean, inherent sweetness - Fermentation can enhance or reduce

In Roasting: - Under-roasted: sugars not developed - Optimal: Maillard and caramelisation - Over-roasted: sugars burnt, bitter - Development time ratio critical

In Brewing: - Proper extraction reveals sweetness - Under-extraction: sour, lacking sweetness - Over-extraction: bitter, masks sweetness - Temperature affects perception

Sweetness Scoring on SCA Form¶

Sweetness Scoring¶

Definition: - Perceived sweetness in the cup - Pleasant, sugary quality - Absence of harshness or defects

Scoring System: - 5 cups evaluated - 2 points per cup showing sweetness - Maximum: 10 points (all cups sweet) - Deduct for cups lacking sweetness

What Reduces Score: - Defects (ferment, mould, etc.) - Harsh, astringent notes - Sour, acetic character - Under or over-extraction

High Sweetness Indicators: - Proper cherry ripeness - Clean processing - Good roast development - Optimal extraction - Overall quality

Evaluation Technique¶

During SCA Cupping Protocol: 1. Evaluate at multiple temperatures 2. Warm temperature most revealing (60-65°C) 3. Sweetness should be present throughout 4. Note persistence in Aftertaste Scoring

Comparison: - Sweet vs. neutral vs. sour/bitter - Intensity of sweetness - Type of sweetness (caramel, honey, fruit) - Integration with other attributes

Types of Sweetness¶

Descriptors¶

Sugar-Like: - White sugar, brown sugar - Candy, confection - Simple, direct sweetness - Often light roasts

Caramelised: - Caramel, toffee - Brown sugar, molasses - Cooked sugar character - Medium to dark roasts

Honey: - Floral sweetness - Complex, layered - Natural, delicate - Quality indicator

Fruit Sweetness: - Berry, stone fruit - Dried fruit character - Natural process common - Ripe, pleasant

Chocolate: - Cocoa, milk chocolate - Dark chocolate - Sweet-bitter balance - Roast developed

Vanilla: - Creamy sweetness - Aromatic compound - Delicate, pleasant - Quality coffee

Intensity Levels¶

Subtle: - Present but delicate - Background sweetness - Supports other flavours - Refined

Moderate: - Clearly perceptible - Pleasant, balanced - Most specialty coffee - Good quality indicator

High: - Pronounced sweetness - Dominant but not cloying - Exceptional coffees - Natural process common

Cloying (Negative): - Overly sweet - Unbalanced - Artificial feeling - Rare in pure coffee

Factors Affecting Sweetness Perception¶

Coffee Quality¶

High Quality: - More perceived sweetness - Clean, developed sugars - Complex sweetness - Multiple sweet notes

Lower Quality: - Less sweetness - Flat, one-dimensional - Defects mask sweetness - Harsh or sour

Processing Method¶

Natural Process: - Fruit sugars - Highest sweetness potential - Berry, dried fruit character - Body enhances perception

../Washed Process: - Clean, refined sweetness - More subtle - Sugar-like quality - Acidity balance important

../Honey Process: - Mucilage sugars - Caramel, honey notes - Sweet complexity - Balanced profile

Roast Development¶

Light Roasts: - Inherent fruit sweetness - Less developed sugars - Acidity can mask - Subtle sweetness

Medium Roasts: - Optimal development - Maillard products - Caramelisation beginning - Balanced sweetness

Dark Roasts: - Caramel sweetness - Sugar bitterness develops - Less inherent sweetness - Roast character dominates

Extraction¶

Under-Extracted: - Sour, acidic - Sweetness underdeveloped - Harsh, unpleasant - Low sweetness score

Optimal: - Sweetness fully expressed - Balanced with acidity - Clean, pleasant - High sweetness score

Over-Extracted: - Bitterness dominates - Sweetness masked - Harsh, astringent - Reduced sweetness perception

Sweetness and Other Attributes¶

Balance¶

Balance Scoring: - Sweetness balances acidity - Counteracts bitterness - Integrates with body - Creates harmony

Imbalance: - Excessive acidity without sweetness - Bitterness overpowers - One-dimensional - Lower balance score

Acidity¶

Acidity Scoring: - Sweet acidity (positive) - Sour acidity (negative) - Sweetness makes acidity pleasant - Integration critical

Sweet-Acid Balance: - Best coffees have both - Neither dominates - Complementary - Complex and interesting

Body¶

Body Scoring: - Heavier body enhances sweetness - Sweetness adds to perceived body - Syrupy = sweet + body - Interaction affects perception

Clean Cup¶

Clean Cup Scoring: - Defects kill sweetness - Clean = sweet - Sweetness indicator of cleanliness - High correlation

Training Sweetness Recognition¶

Reference Standards¶

Create Sweet Solutions: - Sucrose in water (2%, 5%, 10%) - Compare intensities - Build recognition - Anchor perception

Coffee References: - High sweetness: Natural Ethiopian, light roast - Moderate: Washed Colombian, medium roast - Low: Commercial blend, dark roast - Defective: Fermented sample (no sweetness)

Exercises¶

Threshold Testing: - Decreasing sugar concentrations - Find detection limit - Individual variation - Taste Threshold Testing

Comparative Cupping: - Same coffee, different processes - Same origin, different roast levels - Fresh vs. stale - With vs. without defects

Blind Tasting: - Identify sweet vs. not sweet - Rate intensity - Describe type of sweetness - Build confidence

Common Issues¶

Missing Sweetness¶

Causes: - Immature cherries - Poor processing - Under-roasted - Under-extracted - Defects present - Stale coffee

Solutions: - Source quality green - Proper roast development - Dial in extraction - Fresh coffee - Clean processing

Excessive "Sweetness"¶

Cloying: - Over-extracted (bitter-sweet confusion) - Artificial taste - Unbalanced - Usually not actual sweetness

Assessment: - Distinguish from true sweetness - Check for defects - Evaluate balance - Consider whole cup

Cultural Perspectives¶

Preference Variation¶

Western: - Moderate sweetness valued - Balance with acidity preferred - Complexity over intensity

Asian: - Often prefer sweeter profiles - Condensed milk additions common - Less emphasis on acidity - Different quality markers

Latin American: - Traditional: sweet, chocolate notes - Modern: embracing acidity too - Regional variation

Sweetness in Different Brew Methods¶

Espresso¶

Characteristics: - Concentrated sweetness - Crema enhances perception - Body amplifies sweetness - Short extraction window critical

Filter¶

Characteristics: - Clean, clear sweetness - Transparent expression - Acidity interaction important - Temperature evolution affects

Immersion¶

Characteristics: - Full-bodied sweetness - Heavier mouthfeel - Longer in cup - Cooling reveals sweetness