Ingredients, Precursor Sources & Fruit Programme¶
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Merges the ingredient/organism scoring matrices, precursor substrate sourcing, fruit chemistry, and the framboise variety rankings. Matrix scores are comparative estimates from phytochemistry literature (0 = absent → 100 = highest realistic beer ingredient), not quantitation; cultivar/ripeness/processing shift real values materially.
1. Why bound forms matter¶
Free HCAs are consumed in primary (POF+ Sacch decarboxylates them; CO₂ scrubs the vinyls). Bound forms (quinic/tartaric/glucose esters, arabinoxylan-linked) are the long-tail substrate — Brett cinnamoyl esterase liberates them over months, sustaining ethyl phenol production through ageing. Ingredients rich in bound HCAs beat ingredients rich in free HCAs for long-aged beers. No brewing organism degrades lignin; oak contributes via free HCAs leached during toasting.
2. Precursor sources ranked by control¶
- Pure acids (p-coumaric, ferulic, caffeic; trans, ≥98%) — calibrated, flavourless, predictable. First choice; dosing in 04, prep in 08.
- Green coffee bean extract (Alpha01; ~110 mg chlorogenic/capsule) — the practical caffeic route; Brett esterase liberates over weeks–months; ~250–400 µg/L 4-EC per capsule per 5 L.
- Gamma-oryzanol — clean slow-release ferulic; rarely needed with ferulic rest.
- Apple polyphenol extract — p-coumaric + chlorogenic + phloridzin ("aged apple" note), ~50 mg/L procyanidins per tablet per 5 L.
- Pine bark extract — all four acid families but 85–95% procyanidin ballast; only if the tannin (and its O₂-sink benefit) is wanted.
- Whole ingredients — flavour + colour + precursors inseparable. Hibiscus 30 g/5 L ≈ ~120 mg caffeic-equivalent + 30–60 mg p-coumaric + minor ferulic/sinapic (medium confidence, cultivar-variable).
3. Ingredient matrix — high-value entries¶
Legend: Impact scored 1–10 (flavour/colour at typical rates); precursor score 0–100 comparative bound-form content. Top selections by use case (composite of the former spreadsheet).
| Use case | Ingredient | Key bound HCA | Score (0–100) | Impact | Note |
|---|---|---|---|---|---|
| Classic 4-EP loading (p-coumaric-rich) | Grape skins | Coutaric | 100 | — | The benchmark |
| Classic 4-EP loading | Whole grapes / raisins | Coutaric + mixed | 85–90 | — | |
| Classic 4-EP loading | Bitter orange peel | Coumaroyl- + feruloyl-quinic | — (see 4-EG row) | — | Dual-pathway: loads 4-EP and 4-EG together |
| Classic 4-EP loading | Grapefruit / lemon zest | Coumaroyl-quinic | 50–60 | — | |
| 4-EG / clove-spice (ferulic-rich) | Bitter orange peel | Feruloyl-quinic | 80 | — | Strongest single ferulic carrier in the set |
| 4-EG / clove-spice | Vanilla bean | Ferulic (bound) | 80 | — | |
| 4-EG / clove-spice | Citrus zests (general) | Feruloyl-quinic | 50–70 | — | |
| 4-EG / clove-spice | Orange blossom | Ferulic (minor) | — | — | |
| 4-EG / clove-spice | Coriander seed | Ferulic (minor) | — | — | |
| 4-EC / dark depth (chlorogenic-rich) | Light-roast coffee beans | Chlorogenic | 95 | — | Roast level matters — dark roast destroys it |
| 4-EC / dark depth | Apple peel | Chlorogenic | 95 | — | |
| 4-EC / dark depth | Crab apple | Chlorogenic | 90 | — | |
| 4-EC / dark depth | Blueberry | Chlorogenic | 80 | — | |
| 4-EC / dark depth | Bilberry | Chlorogenic | 75 | — | |
| 4-EC / dark depth | Quince | Chlorogenic | 75 | — | |
| 4-EC / dark depth | Elderberry | Chlorogenic | 70 | — | Quoted as 60 in the empirical cross-check below — the original figures disagree |
| 4-EC / dark depth | Morello / sour cherry | Chlorogenic | 70 | — | |
| 4-EC / dark depth | Aronia | Chlorogenic | 70 | — | |
| 4-EC / dark depth | Rowan | Chlorogenic | 70 | — | |
| 4-EC / dark depth | Hawthorn | Chlorogenic | 70 | — | |
| 4-EC / dark depth | Yarrow | Chlorogenic | 50–65 | — | |
| 4-EC / dark depth | Mugwort | Chlorogenic | 50–65 | — | |
| 4-EC / dark depth | Dandelion | Chlorogenic | 50–65 | — | |
| Slow-release complexity (lignin/AX + mixed) | Oak | Lignin | 100 | — | Plus toast-leached free HCAs |
| Slow-release complexity | Chestnut wood | Lignin | — | — | |
| Slow-release complexity | Cherry wood | Lignin | — | — | |
| Slow-release complexity | Spruce tips | Mixed | — | — | |
| Slow-release complexity | Smoked malt | Arabinoxylan-bound | 90 | — | |
| Slow-release complexity | Lapsang souchong | Mixed | — | — | |
| High flavour-impact, modest precursors | Raspberry | Low | — | 9 | Use for character, not chemistry |
| High flavour-impact, modest precursors | Blackcurrant | Low | — | 9 | Use for character, not chemistry |
| High flavour-impact, modest precursors | Passionfruit | Low | — | high | |
| High flavour-impact, modest precursors | Elderflower | Low | — | high | |
| High flavour-impact, modest precursors | Rose petals | Low | — | high | |
| High flavour-impact, modest precursors | Chamomile | Low | — | high | |
| Specials (non-classic substrates) | Chicory root | Chicoric | 100 | — | Non-standard oxidative/funky contribution |
| Specials | Lemon balm | Rosmarinic | 90 | — | Non-standard oxidative/funky contribution |
| Specials | Lavender | Rosmarinic | 60 | — | Non-standard oxidative/funky contribution |
Impact 9 was recorded for the raspberry/blackcurrant pair; "high" marks entries described as high-impact without a stated number. A dash means the original matrix gave no figure.
Empirical cross-check (09): enabled funk — hibiscus, hibiscus+pink peppercorn, aronia, sable grapes, marigold, candied tropical fruit, cassis, juniper, apricot. Did not — dates, lemon, elderberry, mulberry. Elderberry is the confounded case: matrix says chlorogenic 60, empirics say no funk — cyanogenic glycosides/inhibitors suspected. The pattern otherwise tracks caffeic-family loading.
4. Organism × enzyme matrix (condensed)¶
Scores: liberation = bound-HCA esterase/glycosidase capability; PAD/VPR = conversion steps (0–100).
| Organism | Liberation | PAD | VPR | Practical note |
|---|---|---|---|---|
| B. bruxellensis (lambic, WLP650-type) | 60–80 | 100 | 100 | Full kit; slow steady liberation over months |
| B. bruxellensis 'lambicus' (WLP653/WY5526) | 65–85 | 100 | 100 | Aggressive p-coumaric→4-EP; funk pole |
| B. bruxellensis Cantillon-type | 55–90 | 100 | 100 | Ferulic-pathway kinetics; 4-EG-dominant |
| B. bruxellensis wine isolates | 70–85 | 100 | 100 | Highest esterase+VPR; wine literature source |
| B. anomalus (WLP645) | 40–55 | 60 | 50 | Ester-forward, mild phenols |
| B. custersianus | 45–65 | 0 | 0 | Liberates but cannot convert — fruit-forward, zero funk |
| POF+ Sacch (Belgian/saison/WLP644) | 5–20 | 85–90 | 0 | Fast vinyls, stops there (clove not barnyard) |
| POF− Sacch / lager | ~5 | 0 | 0 | Inert to HCAs — preserves the pool for Brett |
| L. plantarum | 35–50 | 70 | 30 | Real esterase + PAD; contributes under stress; hop-sensitive |
| P. damnosus | 35–45 | 30 | 5 | Slow liberation during long ageing — synergises with Brett VPR |
| L. hilgardii | 40–55 | 40 | 15 | Wine LAB; wine-barrel relevance |
| Other LAB / AAB / enterics | 5–30 | ≤30 | ≤10 | Minor HCA players |
| W. anomalus, Pichia, Hanseniaspora | 20–50 | 15–35 | ~0 | β-glucosidase aroma release; underappreciated in spontaneous character |
Pairing logic: 'lambicus'-type + grape skins = hard 4-EP. Cantillon-type + citrus peel/coriander = 4-EG-forward. B. custersianus + any fruit = esters, no funk. Pedio + Brett = slow liberation + full conversion over years. POF− primary → Brett secondary = maximum pathway control (04 §6).
5. Fruit chemistry for fruit lambic¶
Acidity type predicts blend behaviour — malic converts to lactic via Pedio MLF (softens); citric does not (stays sharp); tartaric stable.
| Fruit | Dominant acid | MLF-softened? |
|---|---|---|
| Sour cherry, apricot, peach, apple, plum, blackberry | Malic | Yes |
| Raspberry | Citric + malic | Partially — stays bright |
| Grape | Tartaric | No |
| Citrus, most berries (minor) | Citric | No |
- Rates: sour cherries 110–225 g/L; raspberries ~110 g/L; soft fruit similar. Base: ≥1-year, majority-young lambic (residual sugar + less Brett dominance).
- Freeze–thaw always (cell rupture, load reduction without sterilising). Peak-ripe or slightly over; underripe reads thin and sharp.
- Pits in = almond/marzipan (classic kriek); stems/seeds out (harsh tannin). No sulfited fruit near Brett.
- Maceration 1–6 months; ferments out dry. Second small fruit dose pre-bottling restores top-note aroma and supplies priming sugar — key competition lever (01).
- Measure fruit juice gravity + TA before committing; fruit can raise or lower both ABV and acidity.
- Coarse filtration only if needed — tight filtration strips the microbes that carbonate.
6. Framboise varieties (UK)¶
Ranking by raspberry ketone / ionone / terpene data (Malowicki & Qian 2008; Klesk 2004; RHS trials):
- Willamette — highest measured ketone (>170 ppb), top sensory scores; grows adequately in UK. First choice.
- Malling Jewel — heritage complexity; small berry = high skin:flesh = concentrated aromatics; excellent UK performer.
- Glen Moy — high terpenes, spine-free, good north-UK.
- Meeker / Tulameen — strong secondary choices; Tulameen needs shelter.
- Avoid solo: Glen Ample, Joan J, Autumn Bliss (yield-bred, aroma-poor).
Best blend: Willamette + Malling Jewel ~1:1; Chilcotin as acid accent if sourceable. General rule: small heritage berries beat large modern cultivars on aroma per gram. Ketone varies 30–50% year-to-year with growing conditions.