Coffee Science
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Item Yield Stability of Indonesian Coffee Production - Comparison Between Arabica and Robusta(Editora UFLA, 2025-06-03) Ma'ruf, Muhammad Imam; Bacsi, Zsuzsanna; Hollósy, Zsolt; Kamaruddin, Citra Ayni; Astuty, SriCoffee is a significant commodity in Indonesia, and the two most widely cultivated coffee species are Arabica and Robusta. This study aims to compare the yield stability of Arabica and Robusta coffee in Indonesia, and the performance of regions from the viewpoint of yield stability. Using the Yield Stability Index, the study measures yield stability over a 10-year period (2011-2020) using data from Directorate General of Estates, Ministry of Agriculture. Results show, that the two coffee varieties considerably differ in their stabilities, and the stability of yields across regions also show large discrepancies. While Robusta yields were stable in all the 33 analyzed regions, though to a different extent, for Arabica, produced in 20 regions, only 4 could produce stable yields. The yield stability of Indonesian coffee is influenced by a complex interplay of environmental factors, agronomic, and socio-economic factors. Mitigating these yield stability challenges requires a multifaceted approach.Item Performance of Chitosan Beads after treatment with spent coffee grounds for the adsorption of methylene blue(Editora UFLA, 2024-10-11) Nugraheni, Ari Dwi; Nurmayasari; SholihunSpent coffee grounds are one of the ingredients that are abundantly available today and can be used as a crosslinking material with other materials. The objective of this work was chitosan (CS) beads and treatment spent coffee grounds (TCG) made into beads to determine their ability to adsorb methylene blue (MB). The ratios of CS to TCG (by weight) were varied to make beads with the following composition: 1:0 (CS), 1:1 (CS/TCG 3%), 1:2 (CS/TCG 6%), and 1:3 (CS/TCG 9%). Glutaraldehyde crosslinking was performed to increase the stability of the beads in water; these beads were used to test the capacity to adsorb MB. The beads of different compositions were assessed using several techniques, including scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) and ultraviolet-visible spectroscopy (UV-Vis). The results of the morphological analysis showed that adding TCG resulted in the formation of more pores and cavities in each sample. It enhances its effectiveness as an adsorbent. Analysis of the composition of TCG via XRF showed the presence of a carbon atom, a precursor of activated carbon. The FTIR spectrum indicated that functional groups played a crucial role in adsorption. The UV-Vis results showed that the degradation percentage increased with an increase in the weight ratio of CS/TCG beads. The CS beads treated with TCG could be used to adsorb MB for up to seven repetitions, with an adsorption percentage of 87.8%.Therefore, it is concluded that the measured CS/TCG data were numerically fitted using Langmuir and Freundlich models to analyze the adsorption isotherm behavior.Item Factor analysis for plant and production variables in Coffea canephorain the Western Amazon(Universidade Federal de Lavras, 2022-06-09) Silva, Gabi Nunes; Barroso, Laís Mayara Azevedo; Cruz, Cosme Damião; Rocha, Rodrigo Barros; Ferreira, Fábio MedeirosThe evaluation of morphological characters related to the hulled coffee yield subsidizes the selection of Coffea canephora plants that combine a set of favorable traits. However, the greater the number of traits considered, the more difficult the selection process becomes. In this context, multivariate analyzes can be useful to overcome this problem. The aim of this study was to identify, in a set of agronomic traits of Coffea canephora, the determining factors of biological phenomena and use these factors to recognize patterns of diversity and similarity from biological complexes of interest to the breeder. To this, eleven morphological descriptors were evaluated of 130 clones of the botanical varieties Conilon and Robusta and intervarietal hybrids over two crop years in the experimental field of Embrapa, in the municipality of Ouro Preto do Oeste, state of Rondônia (RO). To group the traits, the multivariate technique of Factor Analysis was used. The effect of genotype x year interaction was significant for the eleven traits analyzed. Based on the scree plot, three factors were established. Factors were interpreted as architecture, vigor and grains with a satisfactory percentage of explained variability. The inter-pretation of the factors highlighted the importance of the Conilon variety to improve the architecture of the Robusta botanical variety. These results show that it is possible to use factor scores to identify varieties and traits that favor higher production of hulled coffee.Item Post-harvest processing of coffee: an overview(Editora UFLA, 2021) Das, SuryatapaCoffee is known as one of the most popular beverages around the world. Coffee belongs to the botanical family Rubiaceae and genus coffea. The two most economically important species are C. arabica (arabica coffee) and C. canephora (robusta coffee).The health benefits of coffee are due to presence of many biologically active components such as caffeine, chlorogenic acid, nicotinic acid, quinolinic acid, trigonelline, tannic acid, and pyrogolic acid. The postharvest processing of coffee cherry involves dry or wet processing, grading, sorting, marketing, blending, and roasting. A series of physical and chemical changes occur during coffee roasting that are responsible for the development of pleasant aroma and flavour of coffee.