NMR analysis of roasted coffee lipids and development of a spent ground coffee application for the production of bioplastic precursors

2019 ◽  
Vol 119 ◽  
pp. 683-692 ◽  
Author(s):  
Kathryn Williamson ◽  
Emmanuel Hatzakis
2021 ◽  
Vol 5 (3) ◽  
pp. 840-851
Author(s):  
Nurul Azhar ◽  
◽  
Roni Kastaman ◽  
Anas Bunyamin

The agricultural, forestry, and fisheries sectors and also the processing industry sectors in Sumedang Regency contributed the highest GDRP value in 2014-2018, so that Sumedang Regency has a potential in agro-industrial sector. This research aims to determined the priority of superior agro-industrial products and public assessment of superior agro-industrial products that have been determined in Sumedang Regency. This research used the Comparison of Exponential Method (MPE) and ANOVA analysis. The data analysis tools were Microsoft Excel and IBM SPSS Statistics 24 Software. The results of the MPE analysis showed that the priority of superior agro-industrial products in Sumedang Regency were ground coffee, roasted coffee, Cilembu roasted sweet potatoes, Cilembu sweet potato chips, red bako mole, opak ketan, white bako mole, Sumedang tofu, tempeh chips, and oncom Pasireungit. ANOVA analysis showed that there were differences of the superior agro-industrial products rank, that is Sumedang tofu, Cilembu roasted sweet potato, oncom Pasireungit, white bako mole, Cilembu sweet potato chips, tempeh chips, roasted coffee, ground coffee, red bako mole, and opak ketan.


1973 ◽  
Vol 56 (5) ◽  
pp. 1126-1129
Author(s):  
Pieter H Vree ◽  
James A Yeransian

Abstract Six laboratories participated in a study of the determination of soluble solids in 9 samples of roasted and ground coffee by 3 methods. In a previous report the reproducibility of the Navellier method and of the method used by the European Decaffeination Association (EDA) was found to be comparable to the current AOAC method. Interlaboratory comparisons show better agreement for the Navellier and EDA methods, with somewhat higher values than the AOAC method. The EDA method has been adopted as official first action to replace method 15.012, which was repealed, official first action.


2019 ◽  
Vol 4 (2) ◽  
pp. 61
Author(s):  
Ridho Asra ◽  
Rusdi Rusdi ◽  
Sofia Nofianti ◽  
Nessa Nessa

<p><em>Akrilamida merupakan senyawa kimia terdapat pada kopi yang disangrai pada suhu diatas 120 ˚C, berpotensi menyebabkan kanker pada manusia. Tujuan dari penelitian ini adalah untuk membandingkan kandungan akrilamida dalam kopi bubuk tradisional dan kopi  luwak dengan metode Kromatografi Cair Kinerja Tinggi.  Fase gerak yang digunakan asetonitril: aquabidest (15: 85, v/v), dengan detektor Photodioday-Array (PDA) pada ℷ   200 nm. Akrilamida dalam sampel kopi bubuk teridentifikasi pada waktu retensi (tR) ± 6,8 menit. Metode ini terbukti valid dengan linearitas y = 356468 + 293761 x, koefisien korelasi (r) = 0,9993, batas deteksi 1,9901 µg/mL dan batas kuantitasi 6,6337 µg/mL, presisi dengan % SBR = 0,207 %, akurasi dengan % perolehan kembali kopi bubuk tradisional dan kopi bubuk luwak 99 % dan 104 %. Kadar akrilamida dalam sampel kopi bubuk 1 sampai 6 berturut-turut adalah 1115 ± 12,17 µg/g sampel (1), 687 ± 7,58  µg/g sampel (2), 1461 ± 63,89 µg/g sampel (3), 221 ± 3,54 µg/g sampel (4), 128 ± 3,24 µg/g sampel (5), 195 ± 1 µg/g sampel (6). Dari keenam sampel kopi bubuk menunjukkan bahwa kadar akrilamida masing-masing sampel berkisar antara 128 sampai 1461 µg/g. Kadar yang diperoleh melebihi batas aman konsumsi akrilamida yang dikeluarkan oleh WHO</em></p><p><em><br /></em></p><p><em><em>Acrylamide is a chemical compound found in roasted coffee at temperatures above 120 ˚C which can potentially cause cancer in humans. The purpose of this research was to analyze acrylamide contents in traditional ground coffee and civet ground coffee by using High Performance Liquid Chromatography (HPLC) method. This analysis was carried out by isocratic elution system, the mobile phase of acetonitrile : aquabidest (15 : 85, v/v), using the stationary phase of the Shimadzu Shimpack ODS C18 column (250 × 4.6 mm), flow rate of 0.5 mL/minute, injection volume 20 µL, with a Photodioday-Array (PDA) detector at a wavelength of 200 nm. Acrylamide in ground coffee samples was identified at retention time (tR) ± 6.8 minutes. This method is proved valid with the linearity y = 356468 + 293761 x, correlation coefficient (r) = 0.9993, limit of detection 1.9901 µg / mL and limit of quantitation 6.6337 µg / mL, precision with % RSD = 0.207 %, acuracy with % recovery of traditional ground coffee and luwak ground coffee 99 % and 104 %. Acrylamide levels in 1 to 6 ground coffee samples in a row is 1115 ± 12.17 µg / g samples (1), 687 ± 7.58 µg / g samples (2), 1461 ± 63.89 µg / g samples (3), 221 ± 3.54 µg / g sample (4), 128 ± 3.24 µg / g sample (5), 195 ± 1 µg / g sample (6). Of the six ground coffee samples showed that the acrylamide levels of each sample ranged from 128 to 1461 µg / g. The levels obtained exceed the safe limits of acrylamide consumption released by WHO</em></em></p>


2004 ◽  
Vol 22 (SI - Chem. Reactions in Foods V) ◽  
pp. S191-S194
Author(s):  
M. Daglia ◽  
A. Papetti ◽  
G. Gazzani

The stability to storage at different temperature and oxygen exposure of green and roasted coffee either as coffee beans or as ground coffee antiradical activity, was evaluated. The results showed that the coffee solution antihydroxyl radical activity was constant, independently from the coffee species, from the roasting process, and moreover from the type of storage conditions, suggesting that temperature and oxygen exposure did not affect this antiradical activity. With regard to antiperoxyl radical activity, all green coffee solutions showed remarkable and stable activity. Conversely, the roasted coffee beans and roasted and ground coffee antiperoxyl radical activity started to increase after three month of storage, suggesting that Maillard reaction products affect the stability of such antiradical property.


2021 ◽  
Vol 67 (4) ◽  
pp. 3686-3692
Author(s):  
Noémi Schmidt

The consumption of capsule coffees is becoming more and more common in everyday life. Today, a number of studies support the fact that there are benefits of consuming the right amount of coffee. Despite its beneficial effects, there are also disadvantages to drinking coffee. For example, the acrylamide found in roasted coffee, which is formed during the process of roasting, poses a health risk. Acrylamide has been classified by the International Agency for Research on Cancer (IARC) as a Group 2A substance, i.e., as an agent which is probably carcinogenic to humans. The technological parameters of the roasting process affect the amount of acrylamide formed in the product. Light roasted coffees contain higher levels of this compound than dark roasted coffees. Numerous studies have been conducted to investigate the acrylamide content of ground coffee products, however, capsule coffees have not yet received similar attention in this respect. In my study, the acrylamide content of various types of commercially available capsule coffees was investigated by HPLC-MS/MS measurements. Decaffeinated coffees are produced using a different technology, so some of these types were also tested.


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