quick way to detect Zover-fermented coffee during Zcupping, before disturbing session | Processing & Quality Forum | Clorofile
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quick way to detect Zover-fermented coffee during Zcupping, before disturbing session

G
satu minggu yang lalu
ada protocol praktis yang gue pakai buat quick-detect over-fermented lot di cupping table sebelum itu kontaminasi seluruh session. berguna banget kalau cupping banyak sample sekaligus.

langkah pertama dry aroma sebelum diseduh: dry grounds dari lot yang over-fermented itu hampir selalu ada hint asam tajam atau acetone-like yang detectable bahkan sebelum air panas masuk. kalau di dry fragrance sudah ada off-note, itu strong early warning.

setelah dituang air panas, evaluasi wet aroma sebelum break crust: over-fermented yang moderate itu aromanya bisa discreet di fase ini, tapi ada yang khas, semacam yogurt-sour yang tidak clean atau sedikit alcohol-sharp yang tidak sepatutnya ada di profil itu.

saat break crust: ini momen yang paling revealing. konsentrasi aroma tertinggi akan terlepas saat crust dipecah. kalau ada sour-fermented notes atau yang karakternya lebih ke asam asetat tajam daripada bright citric, itu signifikan. dalam SCA flavor wheel, descriptor fermented itu ada di zone yang bukan positive, dalam protokol evaluasi COE, kalau terdeteksi bisa langsung diskualifikasi dari penilaian specialty.

catatan penting untuk kimia-nya: asam asetat berlebihan itu terasa sharp dan astringent, threshold persepsi sekitar di atas 400 mg/L mulai unpleasant. asam butirat yang threshold persepsinya sekitar 0.7-1.0 mg/L itu karakternya 'rancid butter' atau cheesy, tanda over-fermentation yang lebih parah.

kalau di dry fragrance sudah obvious: gue biasanya pisahkan gelas itu dari session dan lanjut dengan sample lain dulu. tidak worth kontaminasi palate dulu ke yang jelas ada masalah.
6 Replies
D
satu minggu yang lalu
extra break crust problems: that cupping is done for lot evaluation before purchase decision, usually I marked in form first as' suspect 'time Zbreak crust if there are off-note, but continue tasting to confirm and document. Sometimes the ZZCF002Z. It turns out the cup isn't as bad as the worry. Or instead, the ZZCF003Z. Borderline but the tastets are clear over. It takes both data for proper documentation.
Y
satu minggu yang lalu
that's the plot I used too. One more useful thing: if there's any suspicion in dry fragrance, try compare cross with samples that the clean of origin or processing are similar. The difference becomes much more obscene the second time on the table. palate calibration with reference is too often undeclared.
Z
satu minggu yang lalu
i was in cupping but didn't have a strong technical background. Still confused: 'bright citric Zacidity' vs' Zacetic acid 'What's the difference? They both feel sour, but what difference does the sensory tell?
G
satu minggu yang lalu
bright citric is like lemon or lemon fresh, clean, there's sweet aftertaste, leaving no sense of astinence behind the tongue. acetic acid sharp is more like vinegar, there's an uncomfortable bite, usually an astrology attached, and the ZZZCF002Z. If what's in lemon squeaeze is fun citric, what's in the vinegar to the food is an unwanted acetic. The difference feels clear after a few calibration sessions.
K
satu minggu yang lalu
that side roasting, over-fermented green bean also has a slightly different development time in Zroaster because its structure has changed from ZZCF0099ZZ. It could be faster develop or harder to get a clean Maillard phase. So if cupping lot is supposed to be over-fermented, it needs to check Zroast log that roast data is available, whether there's an anomaly in ROR or an unusual timing.
A
satu minggu yang lalu
one thing I'm still wrong about: too soon dismiss lot due to a little off-note at the beginning of Zcupping. There were a couple of times that the crusts were a little off but after cool down there turned out to be enough redeeming quality for certain applications. learned a lesson: evaluate at several different temperatures, don't decide just from hot tasting.

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