Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw
The extraction of water-soluble bioactive compounds using different green methods is an eco-friendly alternative for valorizing agricultural wastes such as rice straw (RS). In this study, aqueous extracts of RS (particles < 500 µm) were obtained using ultrasound (US), reflux heating (HT), stirrin...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-11-01
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| Series: | Foods |
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| Online Access: | https://www.mdpi.com/2304-8158/9/11/1657 |
| _version_ | 1797548080209330176 |
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| author | Pedro A. V. Freitas Chelo González-Martínez Amparo Chiralt |
| author_facet | Pedro A. V. Freitas Chelo González-Martínez Amparo Chiralt |
| author_sort | Pedro A. V. Freitas |
| collection | DOAJ |
| description | The extraction of water-soluble bioactive compounds using different green methods is an eco-friendly alternative for valorizing agricultural wastes such as rice straw (RS). In this study, aqueous extracts of RS (particles < 500 µm) were obtained using ultrasound (US), reflux heating (HT), stirring (ST) and a combination of US and ST (USST) or HT (USHT). The extraction kinetics was well fitted to a pseudo-second order model. As regards phenolic compound yield, the US method (342 mg gallic acid (GAE). 100 g<sup>−1</sup> RS) was more effective than the ST treatment (256 mg GAE·100 g<sup>−1</sup> RS), reaching an asymptotic value after 30 min of process. When combined with HT (USHT), the US pre-treatment led to the highest extraction of phenolic compounds from RS (486 mg GAE·100 g<sup>−1</sup> RS) while the extract exhibited the greatest antioxidant activity. Furthermore, the USHT extract reduced the initial counts of <i>Listeria innocua</i> by 1.7 logarithmic cycles. Therefore, the thermal aqueous extraction of RS applying the 30 min US pre-treatment, represents a green and efficient approach to obtain bioactive extracts for food applications. |
| first_indexed | 2024-03-10T14:54:20Z |
| format | Article |
| id | doaj.art-def35949fc53461d8f903ff58420d5a8 |
| institution | Directory Open Access Journal |
| issn | 2304-8158 |
| language | English |
| last_indexed | 2024-03-10T14:54:20Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Foods |
| spelling | doaj.art-def35949fc53461d8f903ff58420d5a82023-11-20T20:46:40ZengMDPI AGFoods2304-81582020-11-01911165710.3390/foods9111657Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice StrawPedro A. V. Freitas0Chelo González-Martínez1Amparo Chiralt2Institute of Food Engineering for Development, Universitat Politècnica de València, 46022 Valencia, SpainInstitute of Food Engineering for Development, Universitat Politècnica de València, 46022 Valencia, SpainInstitute of Food Engineering for Development, Universitat Politècnica de València, 46022 Valencia, SpainThe extraction of water-soluble bioactive compounds using different green methods is an eco-friendly alternative for valorizing agricultural wastes such as rice straw (RS). In this study, aqueous extracts of RS (particles < 500 µm) were obtained using ultrasound (US), reflux heating (HT), stirring (ST) and a combination of US and ST (USST) or HT (USHT). The extraction kinetics was well fitted to a pseudo-second order model. As regards phenolic compound yield, the US method (342 mg gallic acid (GAE). 100 g<sup>−1</sup> RS) was more effective than the ST treatment (256 mg GAE·100 g<sup>−1</sup> RS), reaching an asymptotic value after 30 min of process. When combined with HT (USHT), the US pre-treatment led to the highest extraction of phenolic compounds from RS (486 mg GAE·100 g<sup>−1</sup> RS) while the extract exhibited the greatest antioxidant activity. Furthermore, the USHT extract reduced the initial counts of <i>Listeria innocua</i> by 1.7 logarithmic cycles. Therefore, the thermal aqueous extraction of RS applying the 30 min US pre-treatment, represents a green and efficient approach to obtain bioactive extracts for food applications.https://www.mdpi.com/2304-8158/9/11/1657bioactive compoundswater extractionantioxidant activitypseudo-second order lawantimicrobial activityheating |
| spellingShingle | Pedro A. V. Freitas Chelo González-Martínez Amparo Chiralt Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw Foods bioactive compounds water extraction antioxidant activity pseudo-second order law antimicrobial activity heating |
| title | Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw |
| title_full | Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw |
| title_fullStr | Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw |
| title_full_unstemmed | Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw |
| title_short | Application of Ultrasound Pre-Treatment for Enhancing Extraction of Bioactive Compounds from Rice Straw |
| title_sort | application of ultrasound pre treatment for enhancing extraction of bioactive compounds from rice straw |
| topic | bioactive compounds water extraction antioxidant activity pseudo-second order law antimicrobial activity heating |
| url | https://www.mdpi.com/2304-8158/9/11/1657 |
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