Proposal for the Sustainable Assessment of Waste Generated in Coffee Bean Production and Processing

Öz

Coffee is an important agricultural product with origins spanning over a thousand years and stands out today for its high commercial value and widespread consumption. Belonging to the Coffea genus of the Rubiaceae family, coffee has approximately 80 species, but production is largely concentrated in the Coffea arabica (Arabica) and Coffea canephora (Robusta) species. The roasting process of coffee beans produces significant amounts of byproducts such as hulls, pulp, and coffee skins. These byproducts account for more than half of the coffee fruit and generate millions of tons of waste each year. Furthermore, the solid residues left after the preparation of coffee beverages also constitute a significant amount of waste. This waste causes serious environmental problems, increases greenhouse gas emissions, and leads to the waste of natural resources. Therefore, the recovery and recycling of coffee byproducts is an important strategy for environmental sustainability. Research shows that coffee byproducts can be utilized in many ways, including as a source of dietary fiber and antioxidants in functional food production, in biofuel production in the energy sector, as an organic fertilizer in agriculture, as an alternative raw material in the construction sector, and as a moisturizing additive in cosmetics. Thus, coffee waste can be transformed from an environmental burden into an economic asset. This study presents a compilation of studies demonstrating the successful utilization of coffee process waste in various sectors. This research, conducted using a literature review, aims to reveal the potential for creating economic and environmental value through the utilization of these by-products.

Anahtar Kelimeler

• Coffee
• Waste
• Sustainability

Kahve Çekirdeği Üretimi ve İşlenmesinde Ortaya Çıkan Atıklarının Sürdürülebilirlik Kapsamında Değerlendirilmesi Önerisi

Öz

Kahve, kökeni bin yılı aşan ve günümüzde hem yüksek ticari değeri hem de yaygın tüketimiyle öne çıkan önemli bir tarımsal üründür. Rubiaceae familyasının Coffea cinsine ait olan kahvenin yaklaşık 80 türü bulunmakla birlikte, üretim büyük ölçüde Coffea arabica (Arabika) ve Coffea canephora (Robusta) türlerinde yoğunlaşmaktadır. Kahve meyvesinin kavrulmuş çekirdeğe işlenmesi sürecinde kabuk, pulp, kahve zarı gibi önemli miktarda yan ürünler açığa çıkmaktadır. Bu yan ürünlerin kahve meyvesinin yarısından fazlasını oluşturduğu ve her yıl milyonlarca ton atık meydana getirdiği belirtilmektedir. Ayrıca kahve içeceğinin hazırlanmasının ardından geriye kalan katı kalıntılar da yine önemli miktarda atık oluşturmaktadır. Ortaya çıkan bu atıklar, çevresel açıdan ciddi sorunlara neden olmakta; sera gazı emisyonlarını artırmakta ve doğal kaynak israfına yol açmaktadır. Bu nedenle kahve yan ürünlerinin geri kazanımı ve yeniden değerlendirilmesi, çevresel sürdürülebilirlik açısından önemli bir strateji olarak öne çıkmaktadır. Araştırmalar, kahve yan ürünlerinin fonksiyonel gıda üretiminde diyet lifi ve antioksidan kaynağı olarak, enerji sektöründe biyoyakıt üretiminde, tarımda organik gübre olarak, inşaat sektöründe alternatif hammadde olarak ve kozmetikte nemlendirici katkı maddesi şeklinde birçok farklı şekilde değerlendirilebileceğini göstermektedir. Böylece kahve atıkları, çevresel yük olmaktan çıkarak ekonomik değere dönüştürülebilmektedir. Bu çalışma ile kahve proses atıklarının farklı sektörlerde başarılı şekilde değerlendirilebileceğine dair yürütülmüş çalışmalar derleme olarak sunulmaktadır. Literatür taraması yöntemiyle gerçekleştirilen bu araştırmada, söz konusu yan ürünlerin değerlendirilmesiyle ekonomik ve çevresel değer yaratma olanaklarını ortaya koymayı hedeflemektedir.

Anahtar Kelimeler

• Kahve
• Atık
• Sürdürülebilirlik

Kaynakça

1. Referans1 Ateş, G., ve Elmacı, Y. (2017). Potansiyel fonksiyonel bileşen: Kahve çekirdeği zarı. Akademik Gıda, 15(1), 66-74. https://doi.org/10.24323/akademik-gida.306069
2. Referans2 Boğa, T., ve Dertli, E. (2021). Kullanılmış kahve telvesinin lif kaynağı olarak değerlendirilme potansiyeli. Avrupa Bilim ve Teknoloji Dergisi, (31), 114-120. https://doi.org/10.31590/ejosat.909736
3. Referans3 Arnaud, M. J. (1993). Components of coffee. Caffeine, coffee, and health, 43, 666.
4. Referans4 Narita, Y., ve Inouye, K. (2014). Review on utilization and composition of coffee silverskin. Food Research International, (61), 16-22. https://doi.org/10.1016/j.foodres.2014.01.023
5. Referans5 Pandey, A., Soccol, C. R., Nigam, P., Brand, D., Mohan, R., ve Roussos, S. (2000). Biotechnological potential of coffee pulp and coffee husk for bioprocesses. Biochemical Engineering Journal, 6(2), 153-162. https://doi.org/10.1016/S1369-703X(00)00084
6. Referans6 Sak, R., Sak, İ. T. Ş., Şendil, Ç. Ö., & Nas, E. (2021). Bir araştırma yöntemi olarak doküman analizi. Kocaeli Üniversitesi Eğitim Dergisi, 4(1), 227-256.
7. Referans7 Fu, X., Shen, X., Yin, X., Zhang, Y., Wang, X., Han, Z., Lin, Q., ve Fan, J. (2021). Antioxidant and pro-apoptosis activities of coffee husk (Coffea arabica) anthocyanins. International Food Research Journal, 28(6), 1187-1195. http://www.ifrj.upm.edu.my
8. Referans8 Fatiqin, A., Lestari, D., Amalia, R. H. T., Sunarti, R. N., Apriani, I., Raharjeng, A. R. P., Wulan, R. M. S., Suprayogi, T., Febrianto, Y., ve Rahman, S. (2025). Innovation and utilization of coffee skin waste (Coffea robusta L) as a superior compost for the growth of pepper cuttings (Piper nigrum L.). Paper presented at the AIP Conference Proceedings. https://doi.org/10.1063/5.0234698

9. Referans9 Blinová, L., Sirotiak, M., Bartošová, A., ve Soldán, M. (2017). Utilization of waste from coffee production. Vedecké Práce Materiálovotechnologickej Fakulty Slovenskej Technickej Univerzity v Bratislave so Sídlom v Trnave, 25(40), 91. https://www.proquest.com/docview/1945302628?pq-origsite=gscholar&fromopenview=true&sourcetype=Scholarly%20Journals
10. Referans10 Borrelli, R. C., Esposito, F., Napolitano, A., Ritieni, A., ve Fogliano, V. (2004). Characterization of a new potential functional ingredient: coffee silverskin. Journal of agricultural food chemistry, 52(5), 1338-1343. https://doi.org/10.1021/jf034974x
11. Referans11 Murthy, P. S., ve Naidu, M. M. (2012). Sustainable management of coffee industry by-products and value addition—A review. Resources, Conservation recycling, 66, 45-58. https://doi.org/10.1016/j.resconrec.2012.06.005
12. Referans12 Rios, M. B., Iriondo-DeHond, A., Iriondo-DeHond, M., Herrera, T., Velasco, D., Gómez-Alonso, S., Callejo, M. J., ve Del Castillo, M. D. (2020). Effect of coffee cascara dietary fiber on the physicochemical, nutritional and sensory properties of a gluten-free bread formulation. Molecules, 25(6), 1358. https://doi.org/10.3390/molecules25061358
13. Referans13 Perdani, C., ve Pranowo, D. (2019). Total phenols content of green coffee (Coffea arabica and Coffea canephora) in East Java. Paper presented at the IOP Conference Series: Earth and Environmental Science. https://doi.org/10.1088/1755-1315/230/1/012093
14. Referans14 Urugo, M. M., Getachew, P., Lambe, B. T., Yohannis, E., Afework, A., Meteke, N., ... & Worku, M. (2025). Green Valorization of Coffee Industry Residues: Emerging Innovations and Their Role in Sustainable Food and Feed Applications. https://www.preprints.org/frontend/manuscript/ae9369c6edece95bf6dfd78f3fc08604/download_pub
15. Referans15 Nestlé in society, Creating Shared Value and, meeting our commitments 2016, https://www.nestle.com/sites/default/files/asset-library/documents/library/documents/corporate_social_responsibility/nestle-csv-full-report-2016-en.pdf?utm_source=chatgpt.com
16. Referans16 Fernández, J. V., Faria, D. N., Santoro, M. C., Mantovaneli, R., Cipriano, D. F., Brito, G. M., Carneiro, M. T. W., Schettino Jr, M. A., Gonzalez, J. L., ve Freitas, J. C. (2023). Use of unmodified coffee husk biochar and ashes as heterogeneous catalysts in biodiesel synthesis. BioEnergy Research, 16(3), 1746-1757. https://link.springer.com/article/10.1007/s12155-022-10516-z
17. Referans17 Procentese, A., Raganati, F., Olivieri, G., Russo, M. E., ve Marzocchella, A. (2019). Combined antioxidant-biofuel production from coffee silverskin. Applied microbiology biotechnology, 103(2), 1021-1029. https://doi.org/10.1007/s00253-018-9530-3
18. Referans18 Karmee, S. K. (2018). A spent coffee grounds based biorefinery for the production of biofuels, biopolymers, antioxidants and biocomposites. Waste management, 72, 240-254. https://doi.org/10.1016/j.wasman.2017.10.042
19. Referans19 Prihadi, A. R., Maimulyanti, A., Mellisani, B., ve Nurhasanah, N. (2020). Antioxidant activity, tannin content and dietary fiber from coffee husk extract and potential for nutraceutical. Rasayan Journal of Chemistry, 13(2), 955-959. http://dx.doi.org/10.31788/RJC.2020.1325613
20. Referans20 Jiang, Z., Liu, X., Sun, W., Cui, N., Guo, J., Chen, H., ve Huang, W. (2024). Fertilizer optimization combined with coffee husk returning to improve soil environmental quality and young coffee tree growth. Journal of Soil Science Plant Nutrition, 24(1), 650-665). https://doi.org/10.1007/s42729-023-01572-1
21. Referans21 Martuscelli, M., Esposito, L., Di Mattia, C. D., Ricci, A., ve Mastrocola, D. (2021). Characterization of coffee silver skin as potential food-safe ingredient. Foods, 10(6), 1367. https://doi.org/10.3390/foods10061367
22. Referans22 Picca, G., Plaza, C., Madejón, E., ve Panettieri, M. (2023). Compositing of coffee silverskin with carbon rich materials leads to high quality soil amendments. Waste Biomass Valorization, 14(1), 297-307. https://doi.org/10.1007/s12649-022-01879-7
23. Referans23 Leifa, F., Pandey, A., & Soccol, C. R. (2001). Production of Flammulina velutipes on coffee husk and coffee spent-ground. Brazilian Archives of Biology and Technology, 44, 205-212.
24. Referans24 Iriondo-DeHond, A., Iriondo-DeHond, M., ve Del Castillo, M. D. (2020). Applications of compounds from coffee processing by-products. Biomolecules, 10(9), 1219. https://doi.org/10.3390/biom10091219
25. Referans25 Oropeza-Mariano, E., Cerrilla, M. E. O., Herrera-Haro, J. G., Ramírez-Bribiesca, E. J., ve Salinas-Ríos, T. (2022). Use of pulp and husk of coffee in animal feed. Agro Productividad. https://doi.org/10.32854/ agrop.v15i9.2171
26. Referans26 Marew, L., Meheret, F., ve Asmare, B. (2024). Effect of processed coffee husk on feed intake, nutrient digestibility, body weight changes and economic feasibility of Bonga sheep fed on natural pasture hay as a basal diet. Veterinary Medicine Science, 10(6), e70118. https://doi.org/10.1002/vms3.70118
27. Referans27 Maghfirah, A., Asmara, A. P., Sinuhaji, P., ve Marlianto, E. (2020). Improving the characterization of polymer concrete based on coffee shell and pumice waste with mixture of polyester resin and polyurethane resin. Paper presented at the AIP Conference Proceedings. https://doi.org/10.1063/5.0003173
28. Referans28 Gopinandhan, T., Channabasamma, B., ve Hareesh, S. (2025). Production and Physico-chemical Characterization of Biochar Obtained from Coffee Silver Skin. Ecology, Environment Conservation, 31. https://doi.org/10.53550/EEC.2025.v31i03s.052
29. Referans29 Rizkaprilisa, W., Hapsari, M. W., Paramastuti, R., ve Pebrianti, S. A. (2023). Improvement of Bread Nutrition With The Addition of Coffee Silverskin as a Source Of Dietary Fiber And Antioxidants. Food ScienTech Journal, 5(2), 166-176. https://core.ac.uk/download/pdf/595442629.pdf
30. Referans30 Martinez-Saez, N., Ullate, M., Martin-Cabrejas, M. A., Martorell, P., Genovés, S., Ramon, D., ve del Castillo, M. D. (2014). A novel antioxidant beverage for body weight control based on coffee silverskin. Food chemistry, 150, 227-234. https://doi.org/10.1016/j.foodchem.2013.10.100
31. Referans31 Peluso, M. (2023, August). Coffee by-products: economic opportunities for sustainability and innovation in the coffee industry. In Proceedings (Vol. 89, No. 1, p. 6). MDPI.
32. Referans32 Tekin, Z. (2021, December). Kahve üretiminde sürdürülebilirlik ve yeşil işletmecilik uygulamaları: Dünyadan örnekler. In 7th Internatıonal Mardın Artuklu Scıentıfıc Researches Conference, Aralık (pp. 10-12).
33. Referans33 Mete, M., H., (2024). Eko-Girişimcilik, E. İ. V. Yeşil Ekonominin Dinamiği. Metroloji ve Sanayi Ürünleri Güvenliği Genel Müdürlüğü
34. Referans34 Mussatto, S. I., Ballesteros, L. F., Martins, S., & Teixeira, J. A. (2011). Extraction of antioxidant phenolic compounds from spent coffee grounds. Separation and purification technology, 83, 173-179. https://doi.org/10.1016/j.seppur.2011.09.036
35. Referans35 Janissen, B., & Huynh, T. (2018). Chemical composition and value-adding applications of coffee industry by-products: A review. Resources, Conservation and recycling, 128, 110-117. https://doi.org/10.1016/j.resconrec.2017.10.001
36. Referans36 Campos-Vega, R., Loarca-Pina, G., Vergara-Castañeda, H. A., & Oomah, B. D. (2015). Spent coffee grounds: A review on current research and future prospects. Trends in Food Science & Technology, 45(1), 24-36. https://doi.org/10.1016/j.tifs.2015.04.012
37. Referans37 Sivil Toplum Destek Programı-II, Türkiyede gıda atığını önleme ve azaltımı için GKTD kapasite artırımı, Gıda Atığı ve Kaybına İlişkin Mevzuat Değerlendirmesi
38. Referans38 European Comission, 2025, https://food.ec.europa.eu/food-safety/novel-food_en.
39. Referans39 Ponte, S. (2004). Standards and sustainability in the coffee sector. International Institute for Sustainable Development. Available at http://www. iisd. org.
40. Referans40 Partzsch, L. (2025). Hardening sustainability: Supply chain laws complement cocoa and coffee certifications. Forest Policy and Economics, 181, 103661. Gashema, C. (2021). Daha sürdürülebilir kahve üretimi için blok zinciri ve sertifikasyon. https://doi.org/10.1016/j.forpol.2025.103661
41. Referans41 Klingel, T., Kremer, J. I., Gottstein, V., Rajcic de Rezende, T., Schwarz, S., & Lachenmeier, D. W. (2020). A review of coffee by-products including leaf, flower, cherry, husk, silver skin, and spent grounds as novel foods within the European Union. Foods, 9(5), 665. https://doi.org/10.3390/foods9050665
42. Referans42 Akgün, B., Çavuş, F., & Güzelsoy, NA (2025). Öğütülmüş Kavrulmuş Kahvede Katkı Maddesinin Tespiti için SPME/GC/Q-ToF-MS ve Kemometrik Yaklaşımlar. Coffee Science-ISSN 1984-3909 , 20 , e202362-e202362
43. Referans43 Castaldo, L., Graziani, G., Gaspari, A., Izzo, L., Luz, C., Mañes, J., Rubino, M., Meca, G., ve Ritieni, A. (2018). Study of the chemical components, bioactivity and antifungal properties of the coffee husk. https://doi.org/10.5539/jfr.v7n4p43
44. Referans44 López-Galilea, I., Fournier, N., Cid, C., & Guichard, E. (2006). Changes in headspace volatile concentrations of coffee brews caused by the roasting process and the brewing procedure. Journal of Agricultural and Food Chemistry, 54(22), 8560-8566. https://doi.org/10.1021/jf061178t
45. Referans45 Moon, J. K., & Shibamoto, T. (2009). Antioxidant assays for plant and food components. Journal of agricultural and food chemistry, 57(5), 1655-1666. https://doi.org/10.1021/jf803537k
46. Referans46 del Castillo, M. D., Ames, J. M., & Gordon, M. H. (2002). Effect of roasting on the antioxidant activity of coffee brews. Journal of agricultural and food chemistry, 50(13), 3698-3703. https://doi.org/10.1021/jf011702q
47. Referans47 Salazar‐López, N. J., López‐Rodríguez, C. V., Hernández‐Montoya, D. A., & Campos‐Vega, R. (2020). Health benefits of spent coffee grounds. Food Wastes and By‐products: Nutraceutical and Health Potential, 327-351. https://doi.org/10.1002/9781119534167.ch11
48. Referans48 Rodrigues, F., Palmeira-de-Oliveira, A., das Neves, J., Sarmento, B., Amaral, M. H., ve Oliveira, M. B. P. (2015). Coffee silverskin: A possible valuable cosmetic ingredient. Pharmaceutical Biology, 53(3), 386-394. https://doi.org/10.3109/13880209.2014.922589
49. Referans49 Yılmaz, A. E. Çevresel Sürdürülebilirlik Açısından Tarımsal Atıkların Değerlendirilmesi. Journal of Ecological Harmony, 1(1), 32-39. https://doi.org/10.5281/zenodo.15754960
50. Referans50 Kurdoğlu, B. Ç., & Parlak, P. Ö. (2022). Döngüsel Ekonomi-Döngüsel Şehirler. Mimarlık, Planlama ve Tasarımda Güncel Araştırmalar, 2, 110-126.
51. Referans51 Reyhan, A. S. (2014). Sürdürülebilir Üretim-Tüketim Politikalari Çerçevesinde “Yeşil Ekonomi” Üzerine Bir Değerlendirme. Memleket Siyaset Yönetim, 9(22), 327-347. https://dergipark.org.tr/tr/download/article-file/2952813
52. Referans52 Pongsiriyakul, K., Wongsurakul, P., Kiatkittipong, W., Premashthira, A., Kuldilok, K., Najdanovic-Visak, V., Adhikari, S., Cognet, P., Kida, T., ve Assabumrungrat, S. (2024). Upcycling coffee waste: Key industrial activities for advancing circular economy and overcoming commercialization challenges. Processes, 12(12), 2851. https://doi.org/10.3390/pr12122851
53. Referans53 Carneiro, A. D. C. O., Zanuncio, A. J. V., Carvalho, A. G., Jorge, J. A. C. G., dos Santos, R. J. C., Demuner, I. F., ... & Araújo, S. D. O. (2025). Sustainable production of coffee husk pellets: applying circular economy in waste management and renewable energy production. Resources, 14(2), 26. https://doi.org/10.3390/resources14020026
54. Referans54 Franca, A. S., ve Oliveira, L. S. (2022). Potential uses of spent coffee grounds in the food industry. Foods, 11(14), 2064. https://doi.org/10.3390/foods11142064
55. Referans55 Ivashchuk, O. S., Atamanyuk, V. M., Chyzhovych, R. A., & Sobechko, I. B. (2022). Using coffee production waste as a raw material for solid fuel. Journal of Chemistry and Technologies, 30(4), 588-594.
56. Referans56 Hu, Y., Gallant, R., Salaudeen, S., Farooque, A. A., ve He, S. (2022). Hydrothermal carbonization of spent coffee grounds for producing solid fuel. Sustainability, 14(14), 8818. https://doi.org/10.3390/su14148818
57. Referans57 Torres-Valenzuela, L. S., Serna-Jiménez, J. A., ve Martínez, K. (2020). Coffee by-products: Nowadays and perspectives. Coffee Production Research, 1-18.
58. Referans58 Hema, S., Vijayalakshmi, A., ve Silpa, M. (2024). Impact of paddy and coffee husk as the bio compost and its effect on the growth and yield of black gram [Vigna mungo (L.) Hepper]. Agricultural Science Digest, 44(1), 184-188. https://doi.org/10.18805/ag.D-5623
59. Referans59 Cervera-Mata, A., Pastoriza, S., Rufián-Henares, J. Á., Párraga, J., Martín-García, J. M., & Delgado, G. (2018). Impact of spent coffee grounds as organic amendment on soil fertility and lettuce growth in two Mediterranean agricultural soils. Archives of Agronomy and Soil Science, 64(6), 790-804. https://doi.org/10.1080/03650340.2017.1387651
60. Referans60 Mesmar, A. K., Albedwawi, S. T., Alsalami, A. K., Alshemeili, A. R., Abu-Elsaoud, A. M., El-Tarabily, K. A., ve Al Raish, S. M. (2024). The effect of recycled spent coffee grounds fertilizer, vermicompost, and chemical fertilizers on the growth and soil quality of red radish (raphanus sativus) in the united arab emirates: a sustainability perspective. Foods, 13(13), 1997. https://doi.org/10.3390/foods13131997
61. Referans61 Velez, A. R., & Jaramillo Lopez, J. C. (2015). Process for obtaining honey and/or flour of coffee from the pulp or husk and the mucilage of the coffee bean (U.S. Patent Application No. US20150017270 A1). United States Patent and Trademark Office.
62. Referans62 Belan, L., Rego, F. C. D. A., de Castro, F. A. B., Serafim, C. C., Gasparini, M. J., Zundt, M., ... & Eleodoro, J. I. (2019). Replacing oat hay with coffee husk in the feed of finishing lambs.
63. Referans63 Acchar, W., Dultra, E. J. V., & Segadães, A. M. (2013). Untreated coffee husk ashes used as flux in ceramic tiles. Applied Clay Science, 75, 141-147. https://doi.org/10.1016/j.clay.2013.03.009
64. Referans64 de Mello, V., de Mesquita Júnior, G. A., Alvim, J. G. E., Costa, J. D. C. D., & Vilela, F. M. P. (2023). Recent patent applications for coffee and coffee by‐products as active ingredients in cosmetics. International Journal of Cosmetic Science, 45(3), 267-287. https://doi.org/10.1111/ics.12843
65. Referans65 Dordevic, D., Dordevic, S., Abdullah, F. A. A., Mader, T., Medimorec, N., Tremlova, B., & Kushkevych, I. (2023). Edible/biodegradable packaging with the addition of spent coffee grounds oil. Foods, 12(13), 2626. https://doi.org/10.3390/foods12132626
66. Referans66 Moussa, T., Maalouf, C., Bliard, C., Abbes, B., Badouard, C., Lachi, M., do Socorro Veloso Sodré, S., Bufalino, L., Bogard, F., ve Beaumont, F. (2022). Spent coffee grounds as building material for non-load-bearing structures. Materials, 15(5), 1689. https://doi.org/10.3390/ma15051689
67. Referans67 Lourith, N., Xivivadh, K., Boonkong, P., ve Kanlayavattanakul, M. (2022). Spent coffee waste: A sustainable source of cleansing agent for a high-performance makeup remover. Sustainable Chemistry Pharmacy, 29, 100826. https://doi.org/10.1016/j.scp.2022.100826
68. Referans68 Senarath Mudalige Don, A. H., Mat Saad, H., Abdullah, E., Elengoe, A., Lim, S. H., ve Tan, C. H. (2025). Biological Investigation of Spent Coffee Ground for Potential Cosmeceutical Applications. National Academy Science Letters, 48(2), 179-184. https://doi.org/10.1007/s40009-024-01590-2
69. Referans69 Eckhardt, S., Franke, H., Schwarz, S., & Lachenmeier, D. W. (2022). Risk assessment of coffee cherry (cascara) fruit products for flour replacement and other alternative food uses. Molecules, 27(23), 8435. https://doi.org/10.3390/molecules27238435
70. Referans70 Moreno, J., Cozzano, S., Pérez, A. M., Arcia, P., ve Curutchet, A. (2019). Coffee pulp waste as a functional ingredient: Effect on salty cookies quality. J. Food Nutr. Res, 7(9), 632-638. https://doi.org/DOI:10.12691/jfnr-7-9-2
71. Referans71 Özhamamcı, İ. (2024). Coffee Silverskin as a Fat Replacer in Chicken Patty Formulation and Its Effect on Physicochemical, Textural, and Sensory Properties. Applied Sciences, 14(15), 6442. https://doi.org/10.3390/app14156442
72. Referans72 Tınaz, S., & Bağırsakcı, Ş. G. (2025). Üretim Atığı Kahve Çekirdeği Zarı ile Zenginleştirilmiş Fonksiyonel Süt Dilimi Üretimi ve Duyusal Analizi. Sürdürülebilir Mühendislik Uygulamaları ve Teknolojik Gelişmeler Dergisi, 8(2), 256-262. https://doi.org/10.51764/smutgd.1821842
73. Referans73 Ahanchi, M., Sugianto, E. C., Chau, A., & Khoddami, A. (2024). Quality properties of bakery products and pasta containing spent coffee grounds (SCGs): A review. Foods, 13(22), 3576. https://doi.org/10.3390/foods13223576
74. Referans74 Campos‐Vega, R., Arreguín‐Campos, A., Cruz‐Medrano, M. A., & del Castillo Bilbao, M. D. (2020). Spent coffee (Coffea arabica L.) grounds promote satiety and attenuate energy intake: A pilot study. Journal of Food Biochemistry, 44(6), e13204. https://doi.org/10.1111/jfbc.13204
75. Referans75 Esquivel, P., & Jimenez, V. M. (2012). Functional properties of coffee and coffee by-products. Food research international, 46(2), 488-495. https://doi.org/10.1016/j.foodres.2011.05.028
76. Referans76 Yadvika, Sreekrishnan, T. R., Santosh, S., & Kohli, S. (2007). Effect of HRT and slurry concentration on biogas production in cattle dung based anaerobic bioreactors. Environmental technology, 28(4), 433-442. https://doi.org/10.1080/09593332808618804
77. Referans77 Singh, S. P., & Prerna, P. (2009). Review of recent advances in anaerobic packed-bed biogas reactors. Renewable and Sustainable Energy Reviews, 13(6-7), 1569-1575. https://doi.org/10.1016/j.rser.2008.08.006
78. Referans78 Robichaud, Z., & Yu, H. (2022). Do young consumers care about ethical consumption? Modelling Gen Z's purchase intention towards fair trade coffee. British Food Journal, 124(9), 2740-2760. https://doi.org/10.1108/BFJ-05-2021-0536
79. Referans79 Valkila, J. (2009). Fair Trade organic coffee production in Nicaragua—Sustainable development or a poverty trap?. Ecological economics, 68(12), 3018-3025. https://doi.org/10.1016/j.ecolecon.2009.07.002
80. Referans80 Becchetti, L., & Costantino, M. (2008). The effects of fair trade on affiliated producers: An impact analysis on Kenyan farmers. World Development, 36(5), 823-842. https://doi.org/10.1016/j.worlddev.2007.05.007