Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Current Challenges of Cold Brew Coffee – Roasting, Extraction, Flavor Profile, Contamination, and Food Safety

Version 1 : Received: 5 July 2020 / Approved: 5 July 2020 / Online: 5 July 2020 (14:53:27 CEST)

A peer-reviewed article of this Preprint also exists.

Kwok, R.; Lee Wee Ting, K.; Schwarz, S.; Claassen, L.; Lachenmeier, D.W. Current Challenges of Cold Brew Coffee—Roasting, Extraction, Flavor Profile, Contamination, and Food Safety. Challenges 2020, 11, 26. Kwok, R.; Lee Wee Ting, K.; Schwarz, S.; Claassen, L.; Lachenmeier, D.W. Current Challenges of Cold Brew Coffee—Roasting, Extraction, Flavor Profile, Contamination, and Food Safety. Challenges 2020, 11, 26.

Journal reference: Challenges 2020, 11, 26
DOI: 10.3390/challe11020026

Abstract

Cold brew coffee has emerged as a new trend during the last decade. However, “cold brew” is an extraction style of ground roasted coffee with water at less than body temperature (typically 8°C or room temperature) rather than a beverage per se. Cold brew extraction poses several challenges including the need of specific optimization depending on the multivariate influences of coffee variety and processing, roast degree, grinding, dosage, water composition, turbulence, brew system (drip, immersion etc.), time and temperature. While cold brew is typically characterized by a floral sweetness, over-extraction may lead to abundant acidity and bitterness. To avoid this, an extraction degree of 70% was suggested using rather shorter times (i.e. 2 h at 15°C with 80 g/L coffee with optimized medium roast profiles). Due to the lack of sterilizing temperatures during preparation, cold brew is special in the coffee sector because hygiene and food safety aspects pose specific challenges for food industry. To avoid microbiological contamination and spoilage, cold brew should be as freshly prepared as possible and shelf-life should be minimized.

Subject Areas

coffee; cold brew; nitro cold brew; roasting; extraction; hygiene; risk assessment; product quality

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