is controlled yeast inoculation in coffee fermentation worth it, or is it overcomplicated? | Processing & Quality Forum | Clorofile
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is controlled yeast inoculation in coffee fermentation worth it, or is it overcomplicated?

D
satu minggu yang lalu
it's been almost a year trying to control fermentation with a starter culture in some batch. destination one: reduce variance and find a more predictable profile.

Saccharomyces cerevisiae wine- grade and Torluspora delbrueckii. They've both been used in the wine and cider industry a long time. A student from Universidad del Valle de Guatemala had also documented the potentials of its use in coffee a few years ago. Torluspora delbrueckii is particularly interesting because it produces a more complex profile of the pure S. cerevisiae, and there's a paper on the FEMS Yeast Research which does a different production of secondary alcohols and its emphasis.

Of the 8 comparative batches already worked out: Batch with consistent starter, variety of flavors does drop quite a taste instead of natural Zfermentation without inoculation. I haven't been formally authenticated yet, but from the cupping subjective record there's a difference.

One worry that I still think about: is inoculation with this commercial culture eliminating terroir or local uniqueness? yeast and native bacteria that exist in cherry from that particular garden contribute to a unique and unreplicable flavor. If replaced with the same culture everywhere, could it still be called expression of terroir? tradeoff between consistency versus uniqueness.
6 Replies
R
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the Torlaspora delbrueckii strain thing is indeed interesting for coffee. per literature FEMS Yeast Research mentioned, its metabolism produces more glycerol and securary alcohol than the dominant S. cerevisiae, and it contributes to the 'body' perception is more full in the cup. But the key: Compatibility with the local conditions is not copy past from one original to another. The earliest pH, temperature, nutritional composition of cherry, all that affects how the starter culture is growing.
J
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the practical question: the commercial starter culture price is not cheap to convert to cost per kilogram of green. For a small-medium farmer's scale, the extra cost could be arabic. Is the premium acceptable from the buyer that this lot branded as' controlled fermentation 'enough to cover the charges? Or is this model just economically viable for a massive ensurprise scale?
R
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the rough math I ever did: saccharomyces cerevisiae wine- grade is about Rp200,000- 400,000 per 100 grams dependent on suppliers. For one batch of 100 kg cherry, recommended inoculation is very small, around 0.00.02 grams per kg cherry. So the cost of inoculating per batch is minimal. the more expensive is Torluspora delbrueckii because niche, still has to import or buy from the wine suppliers in Bali or Jakarta. But the total cost is still very reasonable if lot can be priced to premium processing tier.
F
satu minggu yang lalu
jangan lupa bakteri asam laktat juga bisa digunakan untuk inokulasi, bukan hanya yeast. Lactobacillus plantarum itu yang paling banyak risetnya untuk aplikasi di kopi. karakteristik yang dihasilkan: lebih lactic, creamy, kurang harsh acidity dibanding fermentasi natural yang sering ada komponen acetic yang tinggi. World Coffee Research sudah kerja sama dengan beberapa universitas untuk dokumentasikan ini, cukup accessible papernya.
S
satu minggu yang lalu
this is in Indonesia to buy the starter culture yeast-grade. Where'd that come from? Has anyone ever bought it and could have shared its reliable suppliers? Or is it full import?
Z
satu minggu yang lalu
i first heard of inoculation for this coffee. All this time thinking fermentation coffee is just the natural microbes of Zcherry and its surroundings. It turns out it can be controlled to a specific level of strain. Adorable, but there's also a little bit worried: if you choose the wrong strain or the dosage inaccurate, can you make coffee systematic? Meaning that inoculation failed. Is it harder to detect than the usual fermentation?

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