Effect of different chemical treatments on nutritional and antinutritional properties of coffee pulp
Different chemical treatments were tested to improve the nutritional value of coffee pulp (CoP): (1) alkali, NaOH solutions of 5 and 10% for 24 and 48 h; (2) a combination of acid and alkali, with first a treatment with HCl (1.5 and 3 M for 24 and 48 h), followed by a NaOH solution of 5% for 48 h...
| Autores Principales: | Ulloa Rojas, J.B., Verreth, J.A.J., van Weerd, J.H., Huisman, E.A. |
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| Formato: | Artículo |
| Idioma: | Inglés |
| Publicado: |
Elsevier
2022
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| Materias: | |
| Acceso en línea: |
http://hdl.handle.net/11056/23196 https://doi.org/10.1016/s0377-8401(02)00050-0 |
| Sumario: |
Different chemical treatments were tested to improve the nutritional value of coffee pulp (CoP):
(1) alkali, NaOH solutions of 5 and 10% for 24 and 48 h; (2) a combination of acid and alkali, with
first a treatment with HCl (1.5 and 3 M for 24 and 48 h), followed by a NaOH solution of 5% for
48 h; (3) A combination of alkali and ensilage, with first a treatment with a NaOH solution of 5%
for 48 h, followed by ensilage with molasses (50 and 100 g molasses/kg of CoP) for 2 and 3 months.
The CoP treated with NaOH alone or with the combination HCl–NaOH showed higher contents
of ash, fat and cellulose but lower contents of antinutritional factors (ANFs) (polyphenols, tannins
and caffeine) than oven-dried-CoP (OD-CoP) (P < 0.05). The true protein content in the CoP
was not affected by the alkali treatment but was reduced in the acid–alkali treated CoP compared
to OD-CoP. A combined treatment with alkali-ensilage resulted in higher true protein, fat and ash
contents (P < 0.05) and in similar contents of cellulose than in OD-CoP. Polyphenols, tannins and
caffeine contents were lower in treated CoP than in OD-CoP, but there was no difference in the
size of the effect for caffeine between one treatment to the other. The higher ash content found in
alkali-ensiled CoP could result from the addition of the alkali. The reduction of ANFs was much
higher in the chemical treated CoP than in the alkali-ensiled CoP. The alkali treatment yielded the
best overall results in upgrading the nutritive value of CoP.
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