scholarly journals Antioxidant and Sensory Assessment of Innovative Coffee Blends of Reduced Caffeine Content

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 448
Author(s):  
Danijela Šeremet ◽  
Patricia Fabečić ◽  
Aleksandra Vojvodić Vojvodić Cebin ◽  
Ana Mandura Mandura Jarić ◽  
Robert Pudić ◽  
...  
Keyword(s):  
Current Trend ◽  
Antioxidant Properties ◽  
Sensory Assessment ◽  
Caffeoylquinic Acid ◽  
Caffeine Content ◽  
Coffee Beans ◽  
Decaffeinated Coffee ◽  
Hedonic Scale ◽  
Different Origins ◽  
Roasted Coffee Beans

Considering the current trend in the global coffee market, which involves an increased demand for decaffeinated coffee, the aim of the present study was to formulate coffee blends with reduced caffeine content, but with pronounced antioxidant and attractive sensory properties. For this purpose, green and roasted Arabica and Robusta coffee beans of different origins were subjected to the screening analysis of their chemical and bioactive composition using standard AOAC, spectrophotometric and chromatographic methods. From roasted coffee beans, espresso, Turkish and filter coffees were prepared, and their sensory evaluation was performed using a 10-point hedonic scale. The results showed that Arabica coffee beans were richer in sucrose and oil, while Robusta beans were characterized by higher content of all determined bioactive parameters. Among all studied samples, the highest content of 3-O-caffeoylquinic acid (14.09 mg g−1 dmb), 4-O-caffeoylquinic acid (8.23 mg g−1 dmb) and 5-O-caffeoylquinic acid (4.65 mg g−1 dmb), as well as caffeine (22.38 mg g−1 dmb), was detected in roasted Robusta beans from the Minas Gerais region of Brazil, which were therefore used to formulate coffee blends with reduced caffeine content. Robusta brews were found to be more astringent and recognized as more sensorily attractive, while Arabica decaffeinated brews were evaluated as more bitter. The obtained results point out that coffee brews may represent a significant source of phenolic compounds, mainly caffeoylquinic acids, with potent antioxidant properties, even if they have reduced caffeine content.

scholarly journals Optimization of Coffee Liqueur Manufacturing Process using Caffeine Content

2019 ◽  
Vol 9 (1) ◽  
pp. 430-433
Keyword(s):  
Alcoholic Beverage ◽  
The Other ◽  
Coffee Bean ◽  
Roasted Coffee ◽  
Caffeine Concentration ◽  
Caffeine Content ◽  
Other Hand ◽  
Coffee Beans ◽  
Roasted Coffee Beans

Coffee liqueur is an alcoholic beverage made by soaking coffee in spirit. Though coffee liqueur is one of the wellknown liqueur, few research was made so far. In this research, coffee liqueur was prepared by using different recipes involving liquors with different ethanol concentrations (20, 40, or 80%), and the soaking periods (14, 21, or 30 days) of the coffee liqueur ingredients (roasted coffee beans, coffee bean powder and other ingredients). Volatile and semi-volatile compounds are important for the organoleptic quality of roasted coffee beans. However, the amounts of these compounds in roasted coffee beans are more dependent on roasting conditions than those of non-volatiles. Furthermore, volatiles are more easily lost during storage. On the other hand, caffeine, a well-known compound of coffee is an intrinsic non-volatile chemical, and the caffeine is present in larger than other potential indicator components in coffee beans, ensuring the quantitative consistency of the coffee extracts in the liqueur. Caffeine was quantified from the prepared coffee liqueurs by HPLC after method validation. The average caffeine content of all 54 analyses (6 analyses per sample) was 2081.2 μg/mL. The highest caffeine concentration 2793 μg/mL was acquired in the sample prepared by 80% ethanol liquor. A soaking period of 14 days, was considered inadequate for sufficient caffeine extraction regardless of liquor alcohol content. Caffeine concentration peaked after soaking coffees and other ingredients for 21 days at 80% ethanol concentration. On the other hand, the most consistent caffeine concentrations in liqueurs were obtained by soaking for 21 days in 40% ethanol (RSD 7.8%), thus it could be the optimum coffee liqueur recipe. The consistency of coffee liqueur quality was assured using caffeine content.

scholarly journals Comparative Study of Antioxidant Property of Coffee and Its Additives

2021 ◽  
pp. 89-96
Author(s):  
Deepti Bajaj ◽  
Suhas Ballal
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Comparative Study ◽  
Antioxidant Properties ◽  
Group Analysis ◽  
Antioxidant Property ◽  
Roasted Coffee ◽  
Instant Coffee ◽  
Coffee Beans ◽  
Roasted Coffee Beans

Coffee, one of the most commonly consumed beverages is a very rich source of antioxidants alongside various other health benefits. The roasted beans of coffee are the seed of berry obtained from coffea species. These roasted coffee beans are utilized to prepare coffee. India is today producer of 16 unique varieties of coffee most of which originate from southern India. The goodness of coffee and Ganoderma can do wonders to human health. This study is aimed to have an analysis of antioxidant properties of instant coffee, filter coffee, coffee with Ganoderma extracts and ginger coffee by estimating the Ascorbic Acid equivalents (AAE). The essence of the study is the presence of additions and the antioxidant activity of the coffee samples in their presence. The two infusions used in the study are extracts of Ganoderma and ginger. The study also aims to have a inter group analysis of antioxidant properties of all the samples. The study was conducted using basic colorimetric techniques.

scholarly journals EVALUASI MUTU KOPI ROBUSTA DI KECAMATAN KARE KABUPATEN MADIUN JAWA TIMUR

Pro Food ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 729
Author(s):  
Choiroel Anam ◽  
Eny Muzayana ◽  
Rohmat Priya Atmaja ◽  
Didik Purnomo
Keyword(s):  
Moisture Content ◽  
Microbiological Quality ◽  
Coffee Bean ◽  
Roasted Coffee ◽  
Physical Quality ◽  
Caffeine Content ◽  
Physical Chemical ◽  
Coffee Beans ◽  
Roasted Coffee Beans

ABSTRACT   Coffee is a leading commodity in Madiun Regency, East Java, the area of coffee plantations in 2018  is 1,432 Ha with an average productivity of 769.63 kg / ha /year.  This study aims to provide information on the physical, chemical, and microbiological quality characteristics of rice coffee, roasted coffee beans and evaluate the primary processing procedures for Mugi Lestari Farmer Group's coffee in Kare Village, Kare District, Madiun Regency. Evaluation of the quality of coffee rice is based on general and specific quality equirements according to SNI 01-2907: 2008. Organoleptic and chemical analysis of rice coffee and roasted coffee beans was carried out to see the state (smell, taste), moisture content, ash content, ash alkalinity, caffeine content, sugar content (reducing), insoluble solids, metal contaminants (Pb and Cu). Assessment of the physical quality of coffee beans shows that the robusta rice coffee produced at Poktan Mugi Lestari has quality according to SNI 01-2907-2008, especially for the parameters of the presence of insects, moisture content, impurities, and no found odor/mold.  Physical quality of roasted coffee beans from Poktan Mugi Lestari when compared to SNI standards has a normal condition, both in terms of smell, taste, and appearance. Chemical parameters of roasted coffee bean samples are also in accordance with the general requirements for roasted coffee (SNI 01-2983-1992). The number of bacteria and molds is less than the maximum limit set. Assessment of physical, chemical, and microbiological quality of packaged coffee powder has a value in accordance with the SNI quality requirements, both for caffeine content, the amount of mold, and bacteria (ALT value), and water content. The primary coffee processing process at Poktan Mugi Lestari has been able to produce rice coffee in accordance with SNI requirements.   Keywords: coffee, robusta, quality, kare madiun   ABSTRAK               Kopi merupakan komoditas unggulan di Kabupaten madiun Jawa Timur, Luas areal perkebunan kopi tahun 2018 di Kabupaten Madiun  1.432 Ha dengan produktivitas rata rata 769,63 kg/ha/tahun. Penelitian ini bertujuan memberikan informasi karakteristik mutu fisik, kimiawi, dan mikrobiologis dari kopi beras, kopi biji sangrai dan mengevaluasi prosedur pengolahan primer kopi Kelompok Tani Mugi Lestari di desa Kare, Kecamatan Kare, Kab Madiun, agar dihasilkan produk dengan mutu yang baik. Evaluasi mutu kopi beras didasarkan pada syarat mutu umum dan khusus sesuai SNI 01-2907:2008. Analisa organoleptik dan kimiawi kopi beras dan kopi biji sangrai dilakukan untuk melihat keadaan (bau, rasa), kadar air, kadar abu, kealkalian abu, kadar kafein, kadar gula (pereduksi), padatan tak larut dalam air, cemaran logam (Pb dan Cu). Penilaian mutu fisik biji kopi diketahui bahwa kopi beras robusta yang dihasilkan di Poktan Mugi Lestari memiliki mutu sesuai dengan SNI 01-2907-2008, khususnya untuk parameter keberadaan serangga, nilai kadar air, pengotor, dan tidak ditemukannya bau busuk/kapang. Keadaan mutu fisik biji kopi sangrai dari Poktan Mugi Lestari jika dibandingan dengan SNI 01-2983-1992 memiliki keadaan yang normal, baik dalam hal bau, rasa, dan penampakan. Parameter kimiawi biji kopi sangrai dalam penelitian juga sesuai dengan syarat umum kopi sangrai (SNI 01-2983-1992). Jumlah bakteri dan kapang kurang dari batas maksimum yang ditetapkan. Penilaian mutu fisik, kimiawi, dan mikrobiologis bubuk kopi yang dikemas memiliki nilai sesuai dengan persyaratan mutu SNI, baik untuk kadar kafein, jumlah kapang, dan bakteri (nilai ALT), dan kadar air. Proses pengolahan primer kopi di Poktan Mugi Lestari sudah mampu menghasilkan kopi beras yang sesuai dengan persyaratan SNI.     Kata kunci: Kopi, Robusta, Mutu, Kare Madiun

scholarly journals Influence of Altitude on Caffeine, 5-Caffeoylquinic Acid, and Nicotinic Acid Contents of Arabica Coffee Varieties

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Bealu Girma ◽  
Abera Gure ◽  
Feyisa Wedajo
Keyword(s):  
Nicotinic Acid ◽  
High Performance ◽  
Array Detector ◽  
Roasted Coffee ◽  
Arabica Coffee ◽  
Caffeoylquinic Acid ◽  
Coffee Beans ◽  
Roasting Process ◽  
Target Analytes ◽  
Roasted Coffee Beans

The influence of altitude on caffeine, 5-caffeoylquinic acid (5-CQA), and nicotinic acid contents of Arabica coffee varieties grown in Southwest Ethiopia was investigated. High-performance liquid chromatography with diode array detector (HPLC-DAD) was used for the determination of the target analytes. Coffee samples were collected from four coffee varieties, named as 74112, 7454, 7440, and 74110, which are cultivated in high, mid, and low altitudes in the study area. The findings of the study showed that the contents of caffeine and 5-CQA in both raw and roasted coffee beans decrease as the growing altitude increases and, thus, for all varieties, their highest concentrations were recorded in lowland coffee beans. Nevertheless, the contents of nicotinic acid increase as the altitude rises and, thus, the highest nicotinic acid content was recorded in highland coffee samples. Besides, after roasting, the contents of caffeine were increased, whereas the contents of 5-CQA were lowered, indicating the possibility of its degradation during the roasting process. Both green and roasted coffee beans also contained relatively higher concentrations of nicotinic acids. Other than the growing altitudes, the contents of caffeine, 5-CQA, and nicotinic acid in coffee beans also vary with coffee varieties. Therefore, coffee varieties that are cultivated at various altitudes may have different biochemical compositions such as caffeine, CGAs, and nicotinic acid that could greatly influence the flavor, aroma, and stimulating attributes of coffee cup quality as well as dietary benefits.

scholarly journals Analysis of Volatile Compounds in Coffee Prepared by Various Brewing and Roasting Methods

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1347
Author(s):  
Ja-Myung Yu ◽  
Mingi Chu ◽  
Hyunbeen Park ◽  
Jooyeon Park ◽  
Kwang-Geun Lee
Keyword(s):  
Volatile Compounds ◽  
Extraction Methods ◽  
Measured Signal ◽  
Roasted Coffee ◽  
Green Coffee Beans ◽  
Coffee Beans ◽  
Espresso Coffee ◽  
Roasting Temperature ◽  
Roasted Coffee Beans ◽  
Significant Factors

Volatile compounds of coffee brewed under various roasting conditions and by different brewing methods were analyzed. Green coffee beans (Coffea arabica) were roasted at 235 °C for 13 min, 240 °C for 15 min, and 245 °C for 17 min. Roasted coffee beans were ground into particles of three different sizes (710, 500, and 355 μm) and brewed by an espresso coffee machine and the cold brew method. Three types of water (filtered, tap, and bottled) were used for coffee extraction. SPME-GC-MS results indicated that increasing the roasting temperature and time increased the levels of 2,2′-methylene-bis-furan, guaiacol, and 4-ethylguaiacol (p < 0.05) and decreased the levels of furfural (p < 0.05). Grind size was inversely proportional to the measured signal of volatiles by GC-MS (p < 0.05). The measured GC/MS intensities of 2-methylpyrazine, 2,5-dimethylpyrazine, and 2-methoxy-4-vinylphenol were significantly higher in coffee brewed with filtered water (p < 0.05) than tap and bottled water. 2-Methylpyrazine, 1-methylpyrrole, and 2-acetylfuran were the most abundant components in the cold brew. Overall, roasting conditions and extraction methods were determined to be significant factors for volatile compounds in coffee. This is the first study showing the analysis of volatile compounds in coffee according to various types of water and extraction methods, such as espresso and cold brew coffee.

Comparison of Extraction Methods for Caffeine, Chlorogenic Acids and Trigonelline in Green and Roasted Coffee Beans

2001 ◽  
Author(s):  
Adriana S. Franca ◽  
Leandro S. Oliveira ◽  
Maria Lúcia A. Borges ◽  
Vany P. Ferraz
Keyword(s):  
Extraction Methods ◽  
Chlorogenic Acids ◽  
Roasted Coffee ◽  
Coffee Beans ◽  
Roasted Coffee Beans

scholarly journals Antioxidant Properties Research of Various Types of Coffee

Food Industry ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 74-81
Author(s):  
Dinara Ignatova ◽  
Nadezhda Makarova
Keyword(s):  
Coffea Arabica ◽  
Antioxidant Properties ◽  
Reducing Power ◽  
Coffea Canephora ◽  
Raw Material ◽  
Antioxidant Compounds ◽  
Common Source ◽  
Coffee Arabica ◽  
Coffee Beans ◽  
Dpph Method

The article presents results of antioxidant compounds determination (total amount of phenolic compounds, total amount of flavonoids) and parameters of the antiradical activity (by the DPPH method) and reducing power (by the FRAP method) in different types of coffee beans depending on roasting degree (weak, medium, strong), coffee variety (Robusta and Arabica) and the importing country. The researchers used the products presented in the retail chains of Samara. The study purpose was to reveal a universal and most common source of functional substances with an antioxidant effect for the human body and use it both in its pure form and in combination with other products (BAS). According to the research results, Robusta coffee (Coffea Canephora) of medium roasting from Brazil has high indicators for all the conducted analyses and can be used as an additional source of antioxidant substances, and as a raw material for obtaining BAS. Coffee Arabica (Coffea Arabica) of medium roasting of Indonesian origin has the highest restoring power, and the highest content of phenols and flavonoids. Coffee Arabica (Coffea Arabica) of a strong degree of roasting from India has the lowest rates. All other types of coffee have average, slightly different results.

IDENTIFICATION OF COFFEE BEANS USING FTIR-SPECTROSCOPY AND MULTIVARIATE ANALYSIS

2021 ◽  
Author(s):  
Д.А. МЕТЛЕНКИН ◽  
Ю.Т. ПЛАТОВ ◽  
Р.А. ПЛАТОВА ◽  
А.Е. РУБЦОВ ◽  
А.М. МИХАЙЛОВА
Keyword(s):  
Multivariate Analysis ◽  
Discriminant Analysis ◽  
Ir Spectra ◽  
Ftir Spectroscopy ◽  
Spectral Data ◽  
Calibration Model ◽  
Absorption Bands ◽  
Coffee Beans ◽  
The Matrix ◽  
Decaffeinated Coffee

Для идентификации кофе используют методы газовой и жидкостной хроматографии, которые дают точную и подробную информацию о его химическом составе, однако трудоемки, сложны по пробоподготовке и непригодны для оперативного мониторинга качества. Цель настоящего исследования – разработка и апробация метода идентификации кофе по ботаническому виду, географическому месту произрастания и обжарке с применением Фурье-ИК-спектроскопии и многомерного анализа. В качестве объектов исследования были образцы кофе в зернах, различающиеся по ботаническому виду (арабика/робуста), географическому месту произрастания (Азия/Америка/Африка) и обжарке (жареный/нежареный). Для разработки моделей идентификации кофе в зернах была сформирована база спектральных данных и применены методы многомерного анализа – метод главных компонент (МГК) и дискриминантный анализ (ДА). ИК-спектры образцов кофе регистрировали с помощью Фурье-ИК-спектрометра Bruker ALPHA с алмазным модулем НПВО в диапазоне 4000–400 см–1 при разрешающей способности спектрометра 2 см–1. Спектральные данные были экспортированы из встроенного программного обеспечения OPUS 7.3.5.0 в Excel. При анализе матрицы спектральных данных выявлены наиболее интенсивные полосы поглощения ИК-спектра, приписываемые наличию функциональных групп воды, липидов, полисахаридов, кофеина и хлорогеновой кислоты в кофе. При сравнении ИК-спектров образцов кофеина, декофеинизированного кофе и кофе в зернах выявлены полосы поглощения спектра, которые можно использовать для построения калибровочной модели содержания кофеина в составе кофе в зернах. По спектральным данным МГК построена многомерная модель градации образцов кофе в зависимости от ботанического вида и наличия обжарки. По матрице факторных нагрузок выявлены полосы поглощения спектра, объясняющие различия образцов по ботаническому виду и обжарке и вносящие наибольший вклад в разделение образцов кофе на группы. Методом ДА по 19 переменным – коэффициентам поглощения на волновых числах спектра разработана система классификационных функций градации образцов кофе по географическому месту произрастания. Доказано, что сочетание Фурье-ИК-спектроскопии с методами многомерного анализа можно использовать как быстрый и неразрушающий инструмент для идентификации кофе в зернах. Gas and liquid chromatography methods are used to identify coffee. They provide accurate and detailed information about its chemical composition; however they are time-consuming, complex in sample preparation and unsuitable for operational quality monitoring. The purpose of this study is to develop and test a method for identifying coffee by botanical species, geographical place of growth and roasting using FTIR-spectroscopy and multivariate analysis. Samples of coffee beans were selected as objects of research, differing in botanical type (Arabica/Robusta), geographical place of growth (Asia/America/Africa) and roasting (roasted/not roasted). To develop models for the identification of grain coffee, a spectral database was formed and the methods of multivariate analysis were applied: principal components analysis (PCA), discriminant analysis. The IR-spectra of coffee samples were recorded using a Bruker ALPHA FTIR-spectrometer with a diamond module in the range of 4000–400 cm–1 with a resolution of the spectrometer of 2 cm–1. Spectral data were exported from the OPUS 7.3.5.0 embedded software to Excel. During analysis the matrix of spectral data, the most intense absorption bands of the IR-spectrum were revealed, attributed to the presence of functional groups of water, lipids, polysaccharides, caffeine and chlorogenic acid in grain coffee. By comparison the IR spectra of the samples: caffeine, decaffeinated coffee and grain coffee, absorption bands of the spectrum were revealed, which can be used to build a calibration model of the caffeine content in the composition of coffee beans. Using PCA based on the spectral data, a multivariate model of the gradation of coffee by botanical type and depending on the roast was build. According to the matrix of factor loadings, absorption bands of the spectrum were revealed, explaining the differences between the samples in botanical type and roasting and making the greatest contribution to the division of coffee samples into groups. By the method of discriminant analysis using 19 variables – absorption coefficients at the wave numbers of the spectrum – a system of classification functions for the gradation of grain coffee samples according to the geographical place of growth has been developed. It is proved that the combination of FTIR-spectroscopy with multivariate analysis methods can be used as a fast and non-destructive tool for identifying coffee beans.

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