Coffee Science

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    Changes in the Chemical Compound and Sensory Profiles of Liberica Fermentation (Coffea liberica) with Cellulolytic Bacteria Alcaligenes sp and Exiguobacterium indicum
    (Editora UFLA, 2024-11-14) Tarigan, Indra Lasmana; Adriliana, Zairaini; Putri, Alya Adiningtyas; Febrianto, Noor Ariefandie; Latief, Madyawati; Sutrisno
    Jambi Province, particularly in Tanjung Jabung Barat Regency, Indonesia, is a crucial producer of Liberica coffee known as Liberika Tungkal Komposit (Libtukom). This variety of Liberica coffee (Coffea liberica) thrives in lowland regions, particularly peatlands. It grows best in slightly acidic soil with a pH between 6.0 and 6.5, which helps the plant absorb nutrients and resist pests more effectively. A significant post-harvest method to improve the quality and yield of Liberica coffee involves fermentation using cellulolytic bacteria, Alcaligenes sp. And Exiguobacterium indicum, found in civet digestive tracts. Fermentation enhances the coffe’s flavor, aroma, and quality, mimicking that of civet coffee. The primary objective of this study was to refine the sensory characteristics of Liberica coffee, improve its proximate composition, preserve its bioactive compounds, and boost its antioxidant properties. The fermentation was conducted over 24 hours and 48 hours periods, with roasting temperatures set at light (170 ºC), medium (190 ºC), and dark (210 ºC). The process began with the preparation of bacterial inoculum, followed by fermentation, roasting, and grinding. Sensory evaluation, proximate analysis, and chemical profiling (via FTIR, LC-MS, antioxidant activity, and total phenolic content) were then performed. The findings revealed that fermented Liberica coffee exhibited improved sensory attributes, achieving specialty-grade status at medium roasting temperatures. There was a decrease in moisture and ash content, an increase in fat content, and a reduction in carbohydrate and protein levels. The FTIR analysis showed the preservation of existing compounds, while LC-MS identified bioactive components based on their retention times and molecular weights. Additionally, the fermented coffee demonstrated increased antioxidant activity and total phenolic content compared to non-fermented samples. This study highlights the potential of fermentation technology to enhance the quality and health benefits of Liberica coffee significantly.
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    Physicochemical and sensory profile of commercial wine coffee in the Gayo Highlands, Indonesia
    (Editora UFLA, 2024-06-13) Muzaifa, Murna; Abubakar, Yusya; Nilda, Cut
    The Gayo Highlands is one of the largest Arabica coffee producing areas in Indonesia. Wine coffee processing is currently very popular in the Gayo High-lands. This study aims to determine of physicochemical and sensory characteristics of commercial wine coffee in Gayo Highlands. Samples were obtained from active wine coffee producers in Central Aceh and Bener Meriah. Analysis was carried out on coffee beans and brewing, including analysis of bean size, moisture content, color, pH, total dissolved solids (TDS), total phenolic content (TPC), and cupping quality. The results found that Gayo arabica wine coffee has a medium size, moisture content of 8.53%-11.67%, and yellow to brown color. Physicochemical characteristics of brewed wine coffee also showed varying results. The pH of coffee wine brewing ranges from 4.68 to 4.95, TDS 3.93 to 4.5 oBrix, and TPC 12.82 to 30 GAE mg/g. Sensory analysis was conducted using the cupping test method. The cupping score of wine coffee on each attribute varied, except body and sweetness. The wine coffee aroma obtained was 6 (good) to 7.75 (very good), wine coffee flavor 6 (good) to 7.5 (very good), wine coffee aftertaste 6 (good) to 7.0 (very good), wine coffee acidity 6 (good) to 7.0 (very good), wine coffee balance 6 (good) to 6.75 (good), overall wine coffee 6 (good) to 7 (very good). Specific fruit aroma charac-teristics that dominated the coffee wine were pineapple, banana, passion fruit, lemon/lime, and berries. Aroma characteristics related to fermentation, namely winey, vinegar, overripe, and soury were detected in all wine coffee samples. Further research is needed to analyze the more complex chemical components of wine coffee (volatile and non-volatile) and their correlation with brewing quality to obtain more comprehensive scientific information on wine coffee quality.
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    Physicochemical and sensory profile of commercial wine coffee in the Gayo Highlands, Indonesia
    (Universidade Federal de Lavras, 2024-06-13) Muzaifa, Murna; Abubakar, Yusya; Nilda, Cut
    The Gayo Highlands is one of the largest Arabica coffee producing areas in Indonesia. Wine coffee processing is currently very popular in the Gayo Highlands. This study aims to determine of physicochemical and sensory characteristics of commercial wine coffee in Gayo Highlands. Samples were obtained from active wine coffee producers in Central Aceh and Bener Meriah. Analysis was carried out on coffee beans and brewing, including analysis of bean size, moisture content, color, pH, total dissolved solids (TDS), total phenolic content (TPC), and cupping quality. The results found that Gayo arabica wine coffee has a medium size, moisture content of 8.53%-11.67%, and yellow to brown color. Physicochemical characteristics of brewed wine coffee also showed varying results. The pH of coffee wine brewing ranges from 4.68 to 4.95, TDS 3.93 to 4.5 oBrix, and TPC 12.82 to 30 GAE mg/g. Sensory analysis was conducted using the cupping test method. The cupping score of wine coffee on each attribute varied, except body and sweetness. The wine coffee aroma obtained was 6 (good) to 7.75 (very good), wine coffee flavor 6 (good) to 7.5 (very good), wine coffee aftertaste 6 (good) to 7.0 (very good), wine coffee acidity 6 (good) to 7.0 (very good), wine coffee balance 6 (good) to 6.75 (good), overall wine coffee 6 (good) to 7 (very good). Specific fruit aroma characteristics that dominated the coffee wine were pineapple, banana, passion fruit, lemon/lime, and berries. Aroma characteristics related to fermentation, namely winey, vinegar, overripe, and soury were detected in all wine coffee samples. Further research is needed to analyze the more complex chemical components of wine coffee (volatile and non-volatile) and their correlation with brewing quality to obtain more comprehensive scientific information on wine coffee quality.