Effects of pulsed electric fields (PEF) on vitamin C and its antioxidant properties

In this study, pulsed electric fields (PEF) treatments and their effects on the structure of vitamin C (VIT-C) were estimated by fluorescence and Fourier transform infrared (FT-IR) spectroscopy, the relative content of VIT-C was measured by HPLC and the antioxidant properties of treated VIT-C by DPPH radical scavenging as well as reducing power tests. The fluorescence intensity of treated VIT-C increased slightly compared to the untreated VIT-C. Moreover, the effect of PEF on the structure of VIT-C was observed using the FT-IR spectra. These phenomena indicated that the PEF affected the conformation of VIT-C, which promoted the VIT-C isomer transformed enol-form into keto-form. In addition, the PEF treatments did not suffer the damage to VIT-C and could slow down the oxidation process in involving of experimental conditions by HPLC. The antioxidant properties of the treated VIT-C were enhanced, which was proved by radical scavenging and also the reducing power tests

Development of local food growth logistics and economics

This study investigates the logistics and economics of local food production for modeling active living. The data collected from selective groups of respondents in Khunyuam dale regarding Thailand’s cost of living, demographics, food products, transport geography, and outbound logistics served as empirical evidence. A unique tiger bean was reviewed as a local asset in food products. The results showed that the capabilities of local economics and logistics were enhanced by establishing regional food production. The local living standard and household economy were logistically improved by the positive outcomes of active living. Finally, the findings suggested that each county should have its own food products to boost logistics and economics

Predictive glycaemic response of pasta enriched with juice, puree, and pomace from red cabbage and spinach

This study reports the digestibility and nutritional quality of pasta made from durum wheat semolina which was partially substituted by puree, juice or pomace from spinach and red cabbage. The results show that 10% substitution of semolina with red cabbage pomace and spinach pomace, 1% substitution of spinach juice, and 2% substitution of spinach puree significantly reduced the area under the curve of the in vitro starch digestion. This reduction was due to a combined effect of decreased starch content, increased dietary fibre content and inhibition of α-amylase caused by vegetable material addition. Total phenolic content (TPC) and antioxidant capacity increased significantly on raw, cooked and digested samples of vegetable fortified pasta compared to control. The β-carotene content of spinach pasta (raw, cooked, and digested) was also higher than that of control. At the 1% substitution level, the juice was more efficient in improving the antioxidant capacity of resultant pasta compared to puree or pomace

Chickpea protein isolation, characterization and application in muffin enrichment

The aim of this study was to enhance the nutritional value and the functional characteristics of muffins by enriching with chickpea protein isolate, while keeping their rheological characteristics. Chickpea Protein isolate (CPI) was prepared by alkaline solubilization (pH 11), followed by isoelectric precipitation at pH 4.5. SDS-PAGE revealed three subunits with molecular weights of 47, 30 and 85 kDa; representing the globulin fractions, legumin-like and vicilin-like proteins. Maximum protein solubility (83.32%) was obtained at pH 11. CPI exhibited an emulsifying activity index of 25.17 m² g¯¹, emulsion stability index of 14.09 min. The foaming capacity and stability were 62% and 94.49%, respectively. Water and oil absorption were 3.65 and 2.30 mL g¯¹, respectively. CPI was added to muffin batter at 0, 2.5, 5, 7.5 and 10%. CPI fortified muffins showed reduction in moisture content, which influenced texture profile analysis through increasing hardness, gumminess and chewiness values. Additionally, both protein content and protein digestibility of muffins increased to 22.2 and 94.08%, respectively. CPI-enriched muffins were darker (lower L) with yellowish crumbs (higher b). Finally, preliminary sensory evaluation showed high consumer acceptance for CPI-enriched muffins

In-vitro digestibility, protein digestibility corrected amino acid, and sensory properties of banana-cassava gluten-free pasta with soy protein isolate and egg white protein addition

Soy protein isolate and egg white protein were added to cassava-banana gluten-free pasta and the effects on the nutritional quality, digestibility properties, protein digestibility corrected amino acid (PDCAA), and sensory acceptance of the pasta was observed. Banana-cassava composite flour (75:25) was blended with soy protein isolate or egg white protein at the following rates: 0, 5, 10, and 15 g/100 g flour. Cooked pasta samples were analysed for total phenolic content (TPC), antioxidant activity, amino acid profiles, protein content, starch digestibility, protein digestibility and protein digestibility corrected amino acid score (PDCAAS). Addition of both proteins decreased starch digestibility, increased protein digestibility, improved the balance of the amino acid profile, and PDCAAS whereas only soy protein isolate enhanced the TPC and antioxidant capacity of the banana-cassava pasta. An egg white protein-fortified banana-cassava pasta had better customer acceptance and purchase intent than soy protein isolate inclusion

Phenolic release during in vitro digestion of cold and hot extruded noodles supplemented with starch and phenolic extracts

Dietary phenolic compounds must be released from the food matrix in the gastrointestinal tract to play a bioactive role, the release of which is interfered with by food structure. The release of phenolics (unbound and bound) of cold and hot extruded noodles enriched with phenolics (2.0%) during simulated in vitro gastrointestinal digestion was investigated. Bound phenolic content and X-ray diffraction (XRD) analysis were utilized to characterize the intensity and manner of starch-phenolic complexation during the preparation of extruded noodles. Hot extrusion induced the formation of more complexes, especially the V-type inclusion complexes, with a higher proportion of bound phenolics than cold extrusion, contributing to a more controlled release of phenolics along with slower starch digestion. For instance, during simulated small intestinal digestion, less unbound phenolics (59.4%) were released from hot extruded phenolic-enhanced noodles than from the corresponding cold extruded noodles (68.2%). This is similar to the release behavior of bound phenolics, that cold extruded noodles released more bound phenolics (56.5%) than hot extruded noodles (41.9%). For noodles extruded with rutin, the release of unbound rutin from hot extruded noodles and cold extruded noodles was 63.6% and 79.0%, respectively, in the small intestine phase, and bound rutin was released at a much lower amount from the hot extruded noodles (55.8%) than from the cold extruded noodles (89.7%). Hot extrusion may allow more potential bioaccessible phenolics (such as rutin), further improving the development of starchy foods enriched with controlled phenolics

Manipulation of the phenolic quality of assam green tea through thermal regulation and utilization of microwave and ultrasonic extraction techniques

The aim of this study was to investigate the catechin levels and antioxidant activities as manipulated by roasting temperature and roasting time of green tea. Roasting temperature and time varied between 100–300 ºC and 60–240 s in green tea production. The main interactions measured were effects on the antioxidant activities, total phenolic content, DPPH, ABTS, FRAP and catechin content (catechin (C), epigallocatechin gallate (EGCG), epigallocatechin (EGC), epicatechin gallate (ECG) and epicatechin (EC)). Optimum roasting conditions were determined as 270 ºC for 240 s, since this enabled high catechin contents, antioxidant activities and production yield. The extraction methods for green tea including traditional extraction (TDE), microwave-assisted extraction (MAE) and ultrasonic-assisted extraction (UAE) using 60% ethanol as solvent were investigated to evaluate the highest bioactive compound and yield of extraction. MAE was found to be more efficient in green tea extraction compared to UAE and TDE. The extracts showed significant cytotoxic potential against the Huh-7 cell line, in concentrations ranging from 31.25 to 1000 µg/mL. The results are useful in understanding the relationship between thermal treatment and extraction conditions on the chemical and nutritional properties of tea catechins, making it possible to select the production and extraction conditions that maximize the levels of beneficial tea ingredients

Influence of substituting wheat flour with quinoa flour on quality characteristics and in vitro starch and protein digestibility of fried-free instant noodles

Wheat flour (WF) was substituted with different level of quinoa core flour (QCF), quinoa whole flour obtained by grinding mill (GQWF) and flour mill (RQWF) equipment separately, to develop QCF, GQWF and RQWF-formulated fried-free instant noodles. Tensile properties and quality attributes of dough, and cooking qualities, texture properties and sensory analysis of noodles were investigated. Substitution with quinoa flour decreased optimal cooking time and iodine contrast index of noodles, while cooking loss was not affected by quinoa flour. Water absorption capacity of RQWF30-noodle was lower than that of WF-noodle. The hardness of QCF and RQWF formulated noodles was significantly higher than that of WF-noodle, while the hardness, chewiness, elasticity and resilience of GQWF-noodle were inferior to WF-noodle. Microstructure results showed that quinoa flour containing-noodles had larger and uneven pores than that of WF-noodles. The sensory indicators of noodles were better when substitution level of quinoa flours was ≤20%. Substitution with quinoa whole flour decreased protein digestibility and reducing sugar released during in vitro starch digestion of noodles. These findings revealed that substitution with quinoa flours (≤20%) may have the potential to develop noodles with both low reducing sugar released and desirable textural attributes