1
|
Syeunda C, Awika JM. Mechanisms of flavonoid inhibition of Maillard reaction product formation in relation to whole grains processing. Food Chem 2024; 449:139237. [PMID: 38581780 DOI: 10.1016/j.foodchem.2024.139237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 03/23/2024] [Accepted: 04/02/2024] [Indexed: 04/08/2024]
Abstract
Whole grains (WG) are beneficial to health but have reduced sensory quality, partly attributable to inhibition of Maillard reaction products (MRP) by WG phenolics. The study investigated how major flavonoid classes in cereals affect Maillard reaction pathways. Flavonoids were reacted with xylose-lysine aqueous system at 160 °C/12 min. Additionally, breads were made with catechin, and wheat and sorghum bran fortification. Low Mw MRP were profiled using UPLC-MS/MS, while melanoidins were characterized using fluorescence spectroscopy and HPSEC-MALS. The flavonoids significantly (p < 0.05) reduced both melanoidin content (by 33-86%) and Mw (3.5-15 kDa vs 20 kDa control), leading to lighter bread crust. Flavonoids inhibited MRP via direct condensation with early-stage amines and carbonyls into stable adducts, and reduction of late-stage polymerization reactions, increasing accumulation of cyclic N-containing intermediates. Inhibitory trend was flavones>flavanones>flavanols. C-Ring π-bond dramatically enhance flavonoid MRP inhibition; thus flavone-rich cereal grains are likely to strongly impact MRP-dependent sensory attributes of WG products.
Collapse
Affiliation(s)
- Cyprian Syeunda
- Texas A&M University, Department of Food Science & Technology, College Station, TX 77843, USA.
| | - Joseph M Awika
- Texas A&M University, Department of Food Science & Technology, College Station, TX 77843, USA.
| |
Collapse
|
2
|
Duke K, Syeunda C, Brantsen JF, Nindawat S, Awika JM. Polyphenol recovery from sorghum bran waste by microwave assisted extraction: Structural transformations as affected by grain phenolic profile. Food Chem 2024; 444:138645. [PMID: 38325084 DOI: 10.1016/j.foodchem.2024.138645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 01/25/2024] [Accepted: 01/30/2024] [Indexed: 02/09/2024]
Abstract
Sorghum milling waste stream (bran), contains diverse phenolic compounds with bioactive properties. The study determined the potential of microwave assisted extraction (MAE) to recover the bran phenolic compounds. Red, white, and lemon-yellow pericarp sorghum brans were subjected to MAE and phenolic yield and structural transformation vs conventional extraction (control) assessed by UPLC-MS/MS, Folin-Ciocalteu and Trolox equivalent antioxidant capacity methods. Phenols yield increased from 3.7-20.3 to 12.6-75.5 mg/g, while antioxidants capacity increased average 3.3X in MAE extracts vs controls. Hydroxycinnamic acids increased most dramatically (3.0-32X) in MAE extracts (0.08-2.64 to 2.57-8.01 mg/g), largely driven by release of cell-wall derived feruloyl- and coumaroyl-arabinose. MAE hydrolyzed flavonoid glycosides into aglycones, and depolymerized condensed flavonoid heteropolymers into flavanones, flavanols and (deoxy)anthocyanidins. Thus, MAE dramatically enhances yield of valuable phenolics from sorghum bran waste, but also alters the phenolic profile in ways that may influence their chemical and biological properties.
Collapse
Affiliation(s)
- Kaitlyn Duke
- Texas A&M University, Department of Food Science & Technology, College Station, TX 77843, USA.
| | - Cyprian Syeunda
- Texas A&M University, Department of Food Science & Technology, College Station, TX 77843, USA.
| | - Julia F Brantsen
- Texas A&M University, Department of Food Science & Technology, College Station, TX 77843, USA; General Mills, Minneapolis, MN 55440, USA(1).
| | - Shruti Nindawat
- Texas A&M University, Department of Food Science & Technology, College Station, TX 77843, USA.
| | - Joseph M Awika
- Texas A&M University, Department of Food Science & Technology, College Station, TX 77843, USA.
| |
Collapse
|
3
|
Cheng J, Zheng L, Zhao J, Yu M, Cao R, Wang D, Li J, Zhou L. Study on the Effect of Microwaved Brewer's Spent Grains on the Quality and Flavor Characteristics of Bread. Foods 2024; 13:461. [PMID: 38338596 PMCID: PMC10855328 DOI: 10.3390/foods13030461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 01/28/2024] [Accepted: 01/29/2024] [Indexed: 02/12/2024] Open
Abstract
To enable a wider utilization of co-products from beer processing and minimize the negative effect of added grain on bread quality, flavor, and other attributes, brewer's spent grains (BSG) are processed through microwave pretreatment, and then the microwave-treated BSG (MW-BSG) is added to bread. So far, there has been no investigation on the effect of microwave-pretreated BSG on bread quality and flavor. In this study, we examined the effects of diverse microwave treatment variables on the physicochemical structure of BSG and explored the consequences of MW-BSG on the quality and flavor of bread. The results showed that soluble dietary fiber and water-soluble protein levels in MW-BSG increased significantly (144.88% and 23.35%) at a 540 W microwave power, 3 min processing time, and 1:5 material-liquid ratio of BSG to water. The proper addition of MW-BSG positively affected the bread texture properties and color, but excessive amounts led to an irregular size and distribution of the bread crumbs. The result of electronic nose and HS-SPME-GC-MS analyses showed that the addition of MW-BSG modified the odor profile of the bread. A sensory evaluation showed mean scores ranging from 6.81 to 4.41 for bread containing 0-10% MW-BSG. Consumers found a maximum level of 6% MW-BSG acceptable. This study endeavors to decrease environmental contamination caused by brewing waste by broadening the methods by which beer co-products can be utilized through an innovative approach.
Collapse
Affiliation(s)
- Jieyi Cheng
- College of Food Science, Beijing Technology and Business University, Beijing 100048, China; (J.C.); (J.Z.); (M.Y.); (R.C.); (D.W.); (J.L.)
| | - Li Zheng
- College of Food Science, Northeast Agricultural University, Harbin 150030, China;
| | - Jinling Zhao
- College of Food Science, Beijing Technology and Business University, Beijing 100048, China; (J.C.); (J.Z.); (M.Y.); (R.C.); (D.W.); (J.L.)
| | - Meihong Yu
- College of Food Science, Beijing Technology and Business University, Beijing 100048, China; (J.C.); (J.Z.); (M.Y.); (R.C.); (D.W.); (J.L.)
| | - Rui Cao
- College of Food Science, Beijing Technology and Business University, Beijing 100048, China; (J.C.); (J.Z.); (M.Y.); (R.C.); (D.W.); (J.L.)
| | - Dan Wang
- College of Food Science, Beijing Technology and Business University, Beijing 100048, China; (J.C.); (J.Z.); (M.Y.); (R.C.); (D.W.); (J.L.)
| | - Jian Li
- College of Food Science, Beijing Technology and Business University, Beijing 100048, China; (J.C.); (J.Z.); (M.Y.); (R.C.); (D.W.); (J.L.)
| | - Linyi Zhou
- College of Food Science, Beijing Technology and Business University, Beijing 100048, China; (J.C.); (J.Z.); (M.Y.); (R.C.); (D.W.); (J.L.)
| |
Collapse
|
4
|
Ramu Ganesan A, Hoellrigl P, Mayr H, Martini Loesch D, Tocci N, Venir E, Conterno L. The Rheology and Textural Properties of Bakery Products Upcycling Brewers' Spent Grain. Foods 2023; 12:3524. [PMID: 37835177 PMCID: PMC10572393 DOI: 10.3390/foods12193524] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 09/14/2023] [Accepted: 09/15/2023] [Indexed: 10/15/2023] Open
Abstract
This study aimed to evaluate the rheological properties of doughs with 50% brewers' spent grain (BSG) derived from a rye-based (RBSG) and barley-based (BBSG) beer added, and the textural profile of the related baked products. Simple model systems using BSG flour mixed with water were studied. Two bakery products, focaccia and cookies, were made as food systems using BSG in a 1:1 ratio with wheat flour (WF). Their rheological properties and texture after baking were characterized. BSG-added dough exhibited viscoelastic properties with a solid gel-like behavior. The addition of BSG increased G' > G″ and decreased the dough flexibility. BSG addition in baked RBSG focaccia increased the hardness, gumminess, and chewiness by 10%, 9%, and 12%, respectively. BBSG cookies had a 20% increase in fracturability. A positive correlation was found between the rheological metrics of the dough and the textural parameters of BBSG-added cookies. PCA analysis revealed that complex viscosity, G', G″, and cohesiveness separated BBSG focaccia from RBSG focaccia and the control. Therefore, the rheological properties of BSG dough will have industrial relevance for 3D-printed customized food products with fiber. Adding RBSG and BBSG to selected foods will increase the up-cycling potential by combining techno-functional properties.
Collapse
Affiliation(s)
- Abirami Ramu Ganesan
- Division of Food Production and Society, Biomarine Resource Valorisation, Norwegian Institute of Bioeconomy Research, Torggården, Kudalsveien 6, NO-8027 Bodø, Norway;
- Food Technology Area, Institute for Mountain Agriculture and Food Technology Laimburg Research Centre, Laimburg 6, 39051 Pfatten/Vadena, BZ, Italy; (P.H.); (H.M.); (D.M.L.); (N.T.); (E.V.)
| | - Philipp Hoellrigl
- Food Technology Area, Institute for Mountain Agriculture and Food Technology Laimburg Research Centre, Laimburg 6, 39051 Pfatten/Vadena, BZ, Italy; (P.H.); (H.M.); (D.M.L.); (N.T.); (E.V.)
| | - Hannah Mayr
- Food Technology Area, Institute for Mountain Agriculture and Food Technology Laimburg Research Centre, Laimburg 6, 39051 Pfatten/Vadena, BZ, Italy; (P.H.); (H.M.); (D.M.L.); (N.T.); (E.V.)
| | - Demian Martini Loesch
- Food Technology Area, Institute for Mountain Agriculture and Food Technology Laimburg Research Centre, Laimburg 6, 39051 Pfatten/Vadena, BZ, Italy; (P.H.); (H.M.); (D.M.L.); (N.T.); (E.V.)
| | - Noemi Tocci
- Food Technology Area, Institute for Mountain Agriculture and Food Technology Laimburg Research Centre, Laimburg 6, 39051 Pfatten/Vadena, BZ, Italy; (P.H.); (H.M.); (D.M.L.); (N.T.); (E.V.)
| | - Elena Venir
- Food Technology Area, Institute for Mountain Agriculture and Food Technology Laimburg Research Centre, Laimburg 6, 39051 Pfatten/Vadena, BZ, Italy; (P.H.); (H.M.); (D.M.L.); (N.T.); (E.V.)
| | - Lorenza Conterno
- Food Technology Area, Institute for Mountain Agriculture and Food Technology Laimburg Research Centre, Laimburg 6, 39051 Pfatten/Vadena, BZ, Italy; (P.H.); (H.M.); (D.M.L.); (N.T.); (E.V.)
| |
Collapse
|
5
|
Syeunda CO, Awika JM. Effect of cereal bran phenolic profile on Maillard reaction products formation during hydrothermal treatment. Food Chem 2023; 423:136320. [PMID: 37182494 DOI: 10.1016/j.foodchem.2023.136320] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 04/02/2023] [Accepted: 05/03/2023] [Indexed: 05/16/2023]
Abstract
Maillard reaction products (MRP) contribute to sensory quality of various foods. Whole grains (WG) are rich in phenols which may influence Maillard reaction pathways during thermal processing and impact WG product sensory attributes. This study investigated how WG phenolic profile affects MRP formation. Amylase-hydrolyzed wheat (white and red) and sorghum (white, red, tannin) brans were hydrothermally processed at 150 °C/6 min, and characterized for MRP using colorimetry, fluorescence spectroscopy, HPLC-MS/MS, and HS-SPME/GC-MS. Bran phenolic structure, and to a lesser extent content, had larger influence on MRP formation than protein/amino acid profile. Polymeric tannins (both in situ and when added to wheat brans) strongly inhibited volatile and non-volatile MRP intermediates and melanoidin formation, likely via their carbocation depolymerization intermediates trapping furans. Principle component analysis demonstrated clear segregation of volatiles formation based on bran phenolic profile. Phenolic composition should be considered in WG product formulation and processing to achieve desired MRP formation.
Collapse
Affiliation(s)
- Cyprian O Syeunda
- Texas A&M University, Department of Food Science & Technology, College Station, TX 77843, USA.
| | - Joseph M Awika
- Texas A&M University, Department of Food Science & Technology, College Station, TX 77843, USA.
| |
Collapse
|
6
|
Chetrariu A, Dabija A. Spent Grain: A Functional Ingredient for Food Applications. Foods 2023; 12:foods12071533. [PMID: 37048354 PMCID: PMC10094003 DOI: 10.3390/foods12071533] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 03/25/2023] [Accepted: 04/01/2023] [Indexed: 04/08/2023] Open
Abstract
Spent grain is the solid fraction remaining after wort removal. It is nutritionally rich, composed of fibers—mainly hemicellulose, cellulose, and lignin—proteins, lipids, vitamins, and minerals, and must be managed properly. Spent grain is a by-product with high moisture, high protein and high fiber content and is susceptible to microbial contamination; thus, a suitable, cost-effective, and environmentally friendly valorization method of processing it is required. This by-product is used as a raw material in the production of many other food products—bakery products, pasta, cookies, muffins, wafers, snacks, yogurt or plant-based yogurt alternatives, Frankfurter sausages or fruit beverages—due to its nutritional values. The circular economy is built on waste reduction and the reuse of by-products, which find opportunities in the regeneration and recycling of waste materials and energy that become inputs in other processes and food products. Waste disposal in the food industry has become a major issue in recent years when attempting to maintain hygiene standards and avoid soil, air and water contamination. Fortifying food products with spent grain follows the precepts of the circular bio-economy and industrial symbiosis of strengthening sustainable development. The purpose of this review is to update information on the addition of spent grain to various foods and the influence of spent grain on these foods.
Collapse
Affiliation(s)
- Ancuța Chetrariu
- Faculty of Food Engineering, Stefan cel Mare University of Suceava, 720229 Suceava, Romania
| | - Adriana Dabija
- Faculty of Food Engineering, Stefan cel Mare University of Suceava, 720229 Suceava, Romania
| |
Collapse
|
7
|
Wang B, Li G, Li L, Zhang M, Yang T, Xu Z, Qin T. Novel processing strategies to enhance the bioaccessibility and bioavailability of functional components in wheat bran. Crit Rev Food Sci Nutr 2022; 64:3044-3058. [PMID: 36190261 DOI: 10.1080/10408398.2022.2129582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Dietary fiber, polysaccharides and phenols are the representative functional components in wheat bran, which have important nutritional properties and pharmacological effects. However, the most functional components in wheat bran exist in bound form with low bioaccessibility. This paper reviews these functional components, analyzes modification methods, and focuses on novel solid-state fermentation (SSF) strategies in the release of functional components. Mining efficient microbial resources from traditional fermented foods, exploring the law of material exchange between cell populations, and building a stable self-regulation co-culture system are expected to strengthen the SSF process. In addition, emerging biotechnology such as synthetic biology and genome editing are used to transform the mixed fermentation system. Furthermore, combined with the emerging physical-field pretreatment coupled with SSF strategies applied to the modification of wheat bran, which provides a theoretical basis for the high-value utilization of wheat bran and the development of related functional foods and drugs.
Collapse
Affiliation(s)
- Baoshi Wang
- School of Life Science and Technology, Henan Collaborative Innovation Center in Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, China
| | - Guangyao Li
- School of Life Science and Technology, Henan Collaborative Innovation Center in Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, China
| | - Linbo Li
- School of Life Science and Technology, Henan Collaborative Innovation Center in Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, China
| | - Mingxia Zhang
- School of Life Science and Technology, Henan Collaborative Innovation Center in Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, China
| | - Tianyou Yang
- School of Life Science and Technology, Henan Collaborative Innovation Center in Modern Biological Breeding, Henan Institute of Science and Technology, Xinxiang, China
| | - Zhichao Xu
- College of Life Science, Northeast Forestry University, Harbin, China
| | - Tengfei Qin
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS); Beijing Capital Agribusiness Future Biotechnology, Beijing, China
| |
Collapse
|
8
|
Carboni Martins C, Rodrigues RC, Domeneghini Mercali G, Rodrigues E. New insights into non-extractable phenolic compounds analysis. Food Res Int 2022; 157:111487. [PMID: 35761711 DOI: 10.1016/j.foodres.2022.111487] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 06/03/2022] [Accepted: 06/05/2022] [Indexed: 11/25/2022]
Abstract
Most of the studies regarding phenolic compounds (PC) have been focused only on one fraction of PC, named extractable phenolic compounds (EPC). As the name suggests, EPC can be directly extracted from the food matrix by using an appropriate solvent. Otherwise, non-extractable phenolic compounds (NEPC) remain in the food matrix after the conventional extraction, and their analysis depends on a hydrolysis process. NEPC is a relevant fraction of PC that acts in the colon, where they are extensively fermented by the action of the microbiota. To understand the health effects associated with the NEPC intake, it is necessary to know which types of compounds are present and their content in foods. In this review, 182 studies published in the last five years about NEPC in foods were evaluated, focusing on critical points of the NEPC analysis. First, EPC exhaustive extraction should be performed before the hydrolysis processes to avoid overestimation of the NEPC fraction. NEPC hydrolysis by aggressive methods modifies their original structure and makes their complete elucidation difficult. These methods must be optimized considering the research objective, as different conditions may result in different amounts and profiles of compounds. Concerning quantification, the widely used spectrophotometric Folin-Ciocalteu method should be avoided as it leads to overestimation. Liquid chromatography coupled to a diode array detector is the most appropriate technique for this purpose. Although pure standard compounds are unavailable in most cases, standards representative of a PC family can be used, and results can be expressed as equivalent. The best approach for NEPC identification is liquid chromatography coupled to a diode array detector and tandem high-resolution mass spectrometry, which generates information regarding chromatographic behavior, UV-vis absorption, accuracy mass and fragmentation pattern. The identification process should associate manual data handling with the bioinformatics-assisted approach.
Collapse
Affiliation(s)
- Caroline Carboni Martins
- Instituto de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil
| | - Rafael C Rodrigues
- Instituto de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil
| | - Giovana Domeneghini Mercali
- Instituto de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil
| | - Eliseu Rodrigues
- Instituto de Ciência e Tecnologia de Alimentos, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil.
| |
Collapse
|
9
|
Naibaho J, Wojdyło A, Korzeniowska M, Laaksonen O, Föste M, Kütt ML, Yang B. Antioxidant activities and polyphenolic identification by UPLC-MS/MS of autoclaved brewers’ spent grain. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113612] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
10
|
Naibaho J, Butula N, Jonuzi E, Korzeniowska M, Laaksonen O, Föste M, Kütt ML, Yang B. Potential of brewers’ spent grain in yogurt fermentation and evaluation of its impact in rheological behaviour, consistency, microstructural properties and acidity profile during the refrigerated storage. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2021.107412] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
11
|
|
12
|
Spent Grain from Malt Whisky: Assessment of the Phenolic Compounds. Molecules 2021; 26:molecules26113236. [PMID: 34072250 PMCID: PMC8199313 DOI: 10.3390/molecules26113236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/21/2021] [Accepted: 05/25/2021] [Indexed: 11/23/2022] Open
Abstract
In order to extract antioxidant phenolic compounds from spent grain (SG) two extraction methods were studied: the ultrasound-assisted method (US) and the Ultra-Turrax method (high stirring rate) (UT). Liquid to solid ratios, solvent concentration, time, and temperature/stirring rate were optimized. Spent grain extracts were analyzed for their total phenol content (TPC) (0.62 to 1.76 mg GAE/g SG DW for Ultra-Turrax pretreatment, and 0.57 to 2.11 mg GAE/g SG DW for ultrasound-assisted pretreatment), total flavonoid content (TFC) (0.6 to 1.67 mg QE/g SG DW for UT, and 0.5 to 1.63 mg QE/g SG DW for US), and antioxidant activity was measured using 2,2-diphenyl-2-picrylhydrazyl (DPPH) free radical (25.88% to 79.58% for UT, and 27.49% to 78.30% for UT). TPC was greater at a high stirring rate and high exposure time up to a certain extent for the Ultra-Turrax method, and at a high temperature for the ultrasound-assisted method. P-coumaric acid (20.4 ± 1.72 mg/100 SG DW for UT, and 14.0 ± 1.14 mg/100 SG DW for US) accounted for the majority of the phenolic found compounds, followed by rosmarinic (6.5 ± 0.96 mg/100 SG DW for UT, and 4.0 ± 0.76 mg/100 SG DW for US), chlorogenic (5.4 ± 1.1 mg/100 SG DW for UT, and non-detectable for US), and vanillic acids (3.1 ± 0.8 mg/100 SG DW for UT, and 10.0 ± 1.03 mg/100 SG DW for US) were found in lower quantities. Protocatechuic (0.7 ± 0.05 mg/100 SG DW for UT, and non-detectable for US), 4-hydroxy benzoic (1.1 ± 0.06 mg/100 SG DW for UT, and non-detectable for US), and caffeic acids (0.7 ± 0.03 mg/100 SG DW for UT, and non-detectable for US) were present in very small amounts. Ultrasound-assisted and Ultra-Turrax pretreatments were demonstrated to be efficient methods to recover these value-added compounds.
Collapse
|