Valorization of waste coffee husks: recovery of bioactive compounds using a green extraction method

• DOI: 10.22533/at.ed.99719091033

• Palavras-chave: Atena

• Keywords: Biowaste, phenolic compounds, alkaloids, natural antioxidants.

• Abstract:

  Coffee husks is considered a

  waste from the coffee processing. To the best of

  our knowledge, researches on the valorization

  of coffee husks with the use of environmentallyfriendly methods is scarce. In this work, cold

  hydroalcoholic extraction of coffee husks

  was applied to recover possible bioactive

  compounds, based on the possibility to provide

  novel products with added-value, with the use of

  a low cost processing. Extractions with 50-65%

  ethanol were able to raise the maximum content

  of the phenolic catechin (23.09-28.39g/100gext)

  and alkaloid caffeine (6.99-7.41g/100gext.),

  associated with the highest levels of total

  phenolic content (3.14-3.18 gallic acid

  equivalent/ 100g ext.), the condensed tannins

  (1.05-1.25 g catechin equivalent/100g ext.), the

  reducing (2.65-2.81 g glucose equivalent/100g

  ext.) and total sugars (0.56-0.59 g sucrose/100g

  ext.) and antioxidant capacities for the

  phosphomolybdenum, and the trolox equivalent

  antioxidant capacity (TEAC) assays.

• Número de páginas: 11