Produção de astaxantina em Haematococcus pluvialis sob efeito da deficiência de fosfato e alta intensidade luminosa
Publicado 2024-11-20
Palavras-chave
- Microalgas,
- Carotenóides,
- Deficiência de fosfato,
- Crescimento médio,
- Alta intensidade luminosa
Como Citar
Copyright (c) 2024 Judith Elena Camacho Kurmen, Natalia Rodriguez Rodriguez
Este trabalho está licenciado sob uma licença Creative Commons Attribution-NoDerivatives 4.0 International License.
Resumo
A astaxantina é um carotenóide produzido pela microalga Haematococcus pluvialis, que acumula até 3 % de astaxantina em peso seco, o que ocorre em condições de estresse, como aumento de luminosidade e limitação de nutrientes. O objetivo estabelecer condições para que H. pluvialis produza astaxantina utilizando alta irradiância e deficiência de fosfato no meio Rudic (RM).
Foram utilizados biorreatores com H.pluvialis UTEX 2505, que continham 20 mg/L (RM1), 30 mg/L (RM2) e 40 mg/L (RM3) de fosfatos, 20 mg/L de fosfatos com 15,013 mg/L de nitratos (RM4) e um controle (RM5), utilizando pH de 6,8, fotoperíodo 20h de luz e 4h de escuro e irradiância de 75 lux na fase de estresse, luz branca, temperatura de 20 ±1 °C. O tratamento que apresentou maior crescimento foi o RM3 com 9,69 x 105 células/mL; A ANOVA (95 %) não estabeleceu diferenças significativas entre os tratamentos (F:0,272; P: 0,895; gl: 4). A maior concentração de clorofila foi para RM3, com 26,2 µg/mL (27 pg/cel.); sem diferenças significativas entre os tratamentos (F: 1,053; P: 0,392; gl: 4). Além disso, o RM3 obteve maior consumo de fosfato (62,5 %); com diferenças significativas entre os tratamentos (F: 3,887; P: 0,011; gl: 4). As alterações morfológicas demonstraram maior acúmulo de células de aplanósporos para RM1 e RM2. O tratamento RM2 obteve maior concentração de astaxantina com 5,772 µg/ mL(6,11 pg/cel); sem diferenças significativas entre os tratamentos (F: 0,622; P: 0,649; gl: 4). Estabelecer que a deficiência de fosfato combinada com alta intensidade luminosa aumenta a produção de astaxantina.
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