Stability of Instant Coffee Foam by Nanobubbles Using Spray-Freeze Drying Technique


Instant coffee with stable foam is considered to be an important parameter for consumer preference and acceptability. For foam sustenance, nanoscale bubbles are more useful compared with microbubbles, due to their high specific area and high stagnation in the liquid phase (without undesirable liquid drainage). The technique that produces nanobubbles in coffee would concomitantly produce and preserve the coffee foam, the best. Spray-freeze drying (SFD) is known to be more effective for the production of instant coffee, compared with conventional spray drying (SD) and freeze drying (FD) techniques. However, its efficiency in the production of nanobubbles has not been explored. To address the issue, in the present study, SFD has been employed to produce instant coffee, and the findings have been compared with SD and FD. The coffee powder obtained with SFD produced a foam with higher stability that also comprised of nanobubbles, in contrast to SD and FD powders. The FE-SEM analysis of SFD foam showed the presence of nanobubbles in the range of 100–200 nm. When the beverage was prepared, the SFD coffee powder dissolved in water at 90 °C produced an excellent foam. The said foam structure was intact up to 2400 s (40 min), and lost only 89.5 ± 2 mm of foam height, during the experiment. Thus, apart from instant coffee, a stable foam in coffee comprising nanobubbles can also be achieved through the SFD.

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  1. Akiyama, M., Tatsuzaki, M., Michishita, T., Ichiki, T., Sumi, M., Ikeda, M., Araki, T., & Sagara, Y. (2012). Package design of ready-to-drink coffee beverages based on food Kansei model-effects of straw and cognition terms on consumer’s pleasantness. Food and Bioprocess Technology, 5(5), 1924–1938.

    CAS  Article  Google Scholar 

  2. Borcherding, K., Hoffmann, W., Lorenzen, P. C., & Schrader, K. (2008). Effect of milk homogenisation and foaming temperature on properties and microstructure of foams from pasteurised whole milk. LWT-Food Science and Technology, 41(10), 2036–2043.

    CAS  Article  Google Scholar 

  3. Boss, E. A., Maciel Filho, R., & de Toledo, E. C. V. (2004). Freeze drying process: Real time model and optimization. Chemical Engineering and Processing: Process Intensification, 43(12), 1475–1485.

    CAS  Article  Google Scholar 

  4. Chen, C., Chi, Y.-J., & Xu, W. (2012). Comparisons on the functional properties and antioxidant activity of spray-dried and freeze-dried egg white protein hydrolysate. Food and Bioprocess Technology, 5(6), 2342–2352.

    CAS  Article  Google Scholar 

  5. Chung, C., Sher, A., Rousset, P., & McClements, D. J. (2017). Use of natural emulsifiers in model coffee creamers: Physical properties of quillaja saponin-stabilized emulsions. Food Hydrocolloids, 67, 111–119.

    CAS  Article  Google Scholar 

  6. Dachmann, E., Hengst, C., Ozcelik, M., Kulozik, U., & Dombrowski, J. (2018). Impact of hydrocolloids and homogenization treatment on the foaming properties of raspberry fruit puree. Food and Bioprocess Technology, 11(12), 2253–2264.

    CAS  Article  Google Scholar 

  7. Deotale, S., Dutta, S., Moses, J. A., Balasubramaniam, V. M., Anandharamakrishnan, C. (2020) Foaming Characteristics of Beverages and Its Relevance to Food Processing. Food Engineering Reviews 12 (2):229-250

    Article  Google Scholar 

  8. Deotale, S. M., Dutta, S., Moses, J. A., & Anandharamakrishnan, C. (2019). Coffee oil as a natural surfactant. Food Chemistry, 295, 180–188.

    CAS  Article  PubMed  Google Scholar 

  9. Dutta, S., Moses, J. A., & Anandharamakrishnan, C. (2018). Modern frontiers and applications of spray-freeze-drying in design of food and biological supplements. Journal of Food Process Engineering, 41(8), e12881.

    Article  Google Scholar 

  10. Farah, A. (2012). Coffee constituents. Coffee: Emerging Health Effects and Disease Prevention, 1, 22–58.

    Google Scholar 

  11. IS 2791 (1992) (Reaffirmed 2009). Soluble coffee powder [FAD 6: stimulant foods] (third revision). Bureau of Indian Standards, New Delhi.

  12. Ishwarya, S. P., & Anandharamakrishnan, C. (2015). Spray-freeze-drying approach for soluble coffee processing and its effect on quality characteristics. Journal of Food Engineering, 149, 171–180.

    Article  Google Scholar 

  13. Jange, C. G., & Ambrose, R. P. K. (2019). Effect of surface compositional difference on powder flow properties. Powder Technology, 344, 363–372.

    CAS  Article  Google Scholar 

  14. Karthik, P., & Anandharamakrishnan, C. (2013). Microencapsulation of docosahexaenoic acid by spray-freeze-drying method and comparison of its stability with spray-drying and freeze-drying methods. Food and Bioprocess Technology, 6(10), 2780–2790.

    CAS  Article  Google Scholar 

  15. Moreyra, R., & Peleg, M. (1981). Effect of equilibrium water activity on the bulk properties of selected food powders. Journal of Food Science, 46(6), 1918–1922.

    CAS  Article  Google Scholar 

  16. Noubigh, A., Abderrabba, M., & Provost, E. (2007). Temperature and salt addition effects on the solubility behaviour of some phenolic compounds in water. The Journal of Chemical Thermodynamics, 39(2), 297–303.

    CAS  Article  Google Scholar 

  17. Oetjen, K., Bilke-krause, C., Madani, M., & Willers, T. (2014). Temperature effect on foamability, foam stability, and foam structure of milk. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 460, 1–6.

    CAS  Article  Google Scholar 

  18. Padma Ishwarya, S., & Anandharamakrishnan, C. (2019). Instant coffee foam: An investigation on factors controlling foamability, foam drainage, coalescence, and disproportionation. Journal of Food Process Engineering, 42(6), e13173.

    Google Scholar 

  19. Saguy, I. S., Marabi, A., & Wallach, R. (2005). Liquid imbibition during rehydration of dry porous foods. Innovative Food Science & Emerging Technologies, 6(1), 37–43.

    Article  Google Scholar 

  20. Santos, D., Maur’icio, A. C., Sencadas, V., Santos, J. D., Fernandes, M. H., & Gomes, P. S. (2017). Spray drying: an overview. In Biomaterials-Physics and Chemistry-New Edition. Intechopen.

  21. Shin, D., Park, J. B., Kim, Y.-J., Kim, S. J., Kang, J. H., Lee, B., et al. (2015). Growth dynamics and gas transport mechanism of nanobubbles in graphene liquid cells. Nature Communications, 6(1), 1–6.

    Google Scholar 

  22. Shinichiro, H., Akiyama, M., Yoneyama, R., Watanabe, K., Koizumi, R., Miyaji, K., et al. (2018). Effects of manufacturing conditions on the foaming properties of milk and sensory characteristics of foamed milk. LWT - Food Science and Technology., 99, 555–561.

    CAS  Article  Google Scholar 

  23. Silva, A. C. C., & Schmidt, F. C. (2019). Vacuum freezing of coffee extract under different process conditions. Food and Bioprocess Technology, 12(10), 1683–1695.

    Article  Google Scholar 

  24. Stephenson, R. M. (1993). Mutual solubility of water and aldehydes. Journal of Chemical and Engineering Data, 38(4), 630–633.

    CAS  Article  Google Scholar 

  25. Sun, J., Wang, F., Sui, Y., She, Z., Zhai, W., Wang, C., & Deng, Y. (2012). Effect of particle size on solubility, dissolution rate, and oral bioavailability: Evaluation using coenzyme Q10 as naked nanocrystals. International Journal of Nanomedicine, 7, 5733.

    CAS  PubMed  PubMed Central  Google Scholar 

  26. Ulatowski, K., Sobieszuk Pawełand Mróz, A., & Ciach, T. (2019). Stability of nanobubbles generated in water using porous membrane system. Chemical Engineering and Processing-Process Intensification, 136, 62–71.

    CAS  Article  Google Scholar 

  27. Ushikubo, F. Y., Furukawa, T., Nakagawa, R., Enari, M., Makino, Y., Kawagoe, Y., Shiina, T., & Oshita, S. (2010). Evidence of the existence and the stability of nano-bubbles in water. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 361(1–3), 31–37.

    CAS  Article  Google Scholar 

  28. Yount, D. E. (1982). Bubble nucleation in aqueous media: implications for diving physiology. In Mechanics and Physics of Bubbles in Liquids (pp. 37–44). Springer.

  29. Zhang, X. H., Quinn, A., & Ducker, W. A. (2008). Nanobubbles at the interface between water and a hydrophobic solid. Langmuir, 24(9), 4756–4764.

    CAS  Article  Google Scholar 

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This work has been supported by Ministry of Food Processing Industries, Government of India, through SERB, Government of India, and Indian Council of Medical Research (ICMR-SRF) fund.

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Correspondence to C. Anandharamakrishnan.

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Deotale, S.M., Dutta, S., Moses, J.A. et al. Stability of Instant Coffee Foam by Nanobubbles Using Spray-Freeze Drying Technique. Food Bioprocess Technol (2020).

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  • Spray-freeze drying
  • Nanobubbles
  • Coffee
  • Foam stability
  • Foam structure