ORCID Profile
0000-0003-4973-4411
Current Organisation
University of Adelaide
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Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 2020
Publisher: Wiley
Date: 26-05-2022
DOI: 10.1111/IJFS.15817
Abstract: This study investigated the effect of sequential extraction techniques and pretreatment methods in enhancing the recovery of high‐value products from spent coffee ground. Supercritical carbon dioxide (SC‐CO 2 ) deoiling was performed to recover non‐polar lipids, and subcritical water (SCW) hydrolysis of deoiled spent coffee ground (SCG) was conducted involving pretreatment with ultrasound (US‐SCG), and s le particle size reduction (PS‐SCG). SCW temperature, solid/liquid mixing ratio, constant pressure and residence time were studied for their effect on extracting reducing sugars (RS), total phenolic content (TPC), total flavonoid content (TFC), 5‐HMF, and furfural. Temperature increase enhanced hydrolysis efficiency and promoted RS dehydration into 5‐HMF and furfural. At 180 °C and 40 mg/600 mL, TPC, TFC and RS values increased significantly with ultrasound pretreatment correlating with improved antioxidant activities by DPPH and ABTS assays. Highest amount of 5‐HMF and furfural was obtained at 210°C (highest temperature studied) with 44.71 and 2.36 mg/100 g. Chlorogenic acid recovery was the highest in the non‐deoiled SCG (15.07 mg/100 g), with no significant difference observed in PS‐SCG, suggesting an increase due to its reduced particle size. The results of this study provide comprehensive knowledge on the combined effects of integrated engineering systems to boost the valorisation of SCGs into high‐value products.
Publisher: MDPI AG
Date: 27-05-2022
DOI: 10.3390/MD20060357
Abstract: Artina pectinata (Comb pen shell, CPS) is a high-protein source that contains a variety of essential amino acids. Subcritical water hydrolysis (SWH) was used to recover amino acids from the posterior adductor muscle (PAM), anterior adductor muscle (ADM), and mantle. The temperatures ranged from 120 °C to 200 °C, and the pressure and time of hydrolysis were 3 MPa and 30 min, respectively. Further characterization of the hydrolysates was performed to ascertain amino acid profiles and biofunctional properties. The hydrolysates contained more free amino acids than the untreated s les. Antioxidant activity of treated s les increased as SW temperatures increased. At 200 °C, those inhibiting ACE had a maximum antihypertensive activity of 200 °C in 1% PAM, ADM, and mantle with 85.85 ± 0.67, 84.55 ± 0.18, and 82.15 ± 0.85%, respectively, compared to 97.57 ± 0.67% in 1% standard captopril. Perhaps the most significant finding was the predominance of taurine in the three parts following SW treatment at 120 °C. The hydrolysates may be of considerable interest for use in food or energy drinks. SWH demonstrates efficacy in recovering amino acids, particularly taurine, from edible parts of A. pectinata.
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 10-2019
DOI: 10.1016/J.FOODCHEM.2019.05.129
Abstract: In this study, the soybean milk and tofu byproduct okara was subjected to subcritical water extraction with the intention of recovering isoflavones with minimal degradation. Response Surface Methodology (RSM) of the extraction variables indicated that optimized conditions would be T = 146.23 °C, P = 3.98 MPa, and α = 20 mg (solid)/mL (extractant). Mathematical models for the conversion and degradation of isoflavones were solved as a set of simultaneous equations leading to rate constants and time-dependent concentration profiles for each genistein- and daidzein-based compound. These kinetic analyses suggested that an optimum extraction time, under RSM-optimized conditions, would be 213.5 ± 8.7 min. The results of our study suggest that okara byproducts could be valorized efficiently, as a source of bioactive isoflavone aglycones, using subcritical water. The mathematical models and optimized extraction conditions that we established in this study could be employed, as process control-optimized variables, in the exploitation of okara, specifically in the isolation of genistein and daidzein.
Publisher: Elsevier BV
Date: 10-2021
Publisher: Informa UK Limited
Date: 23-06-2020
No related grants have been discovered for David Nkurunziza.