Zainab Albakry’s research while affiliated with Jimei University and other places

In this study, the role of roasting on the total phenol, antioxidant capacity, phenolic constituents and fatty acid profile of the grape seeds was investigated. Total phenolic and flavonoid quantities of the grape seeds roasted in microwave (MW) and conventional oven (CO) systems were recorded between 673.57 (control) and 713.57 (MW) to 7121.67 (MW) and 7791.67 mg/100 g (CO), respectively. Antioxidant activities of the grape seeds varied between 6.57 (MW) and 7.24 mmol/kg (control). Catechin and rutin quantities of the grape seeds were recorded to be between 435.30 (CO) and 581.57 (control) to 94.94 (CO) and 110.53 mg/100 g (MW), respectively. While gallic acid amounts of the seed samples are established between 21.06 (control) and 101.79 (MW), quercetin values of the grape seeds were assigned to be between 56.59 (control) and 77.81 mg/100 g (CO). In addition, p-coumaric acid and resveratrol quantities of the grape seeds were recorded between 15.43 (control) and 22.98 (CO) to 12.50 (CO) and 29.57 mg/100 g (MW), respectively. The main fatty acids in oil samples were linoleic, oleic, palmitic and stearic acids in decreasing order. Linoleic and oleic acid values of the oils provided from grape seeds were recorded to be between 72.75 (control) and 73.33% (MW) to 14.79 (CO) and 14.87% (MW), respectively. It was observed that the element results related to the grape seed differed based on the roasting type when compared to the control. The most abundant elements in the grape seed were K, P, Mg, S, Na, Fe, Ca, Zn, and K and P amounts of the grape seeds were reported to be between 6706.93 (MW) and 7089.33 (control) to 2764.27 (CO) and 2927.97 mg/kg (control), respectively. It is thought that it would be beneficial to add grape seeds to foods as an ingredient by taking into account these phytochemical components as a result of the applied heat treatment. graphical abstract Fullsize Image

In this study, the effect of fermentation on the oil and bioactive component, pH and acidity values of the brine, antioxidant activity values, phenolic constituents, fatty acid profile and biogenic element quantities of fresh almond kernels fermented in two different brine concentrations (5 and 10%; salt:water/ w:v) were examined. pH and total acidity values of 5 and 10% brines at the end of fermentation were determined as 6.32 and 0.36% and 5.59 and 0.54%, respectively. An opposite relationship was observed between pH and acidity of the brine. Total phenol and flavonoid contents of fresh and fermented almonds varied between 15.90 (5% brine) and 64.23 mg gallic acid equivalent (GAE)/100 g (fresh almond) to 170.43 (5% brine) and 285.29 mg/100 g (fresh almond), respectively. The dominant phenolic constituents of fresh and fermented almonds were catechin, 3,4-dihydroxybenzoic acid, cinnamic acid and kaempferol. Oleic and linoleic acid quantities of the oils provided from fresh and fermented almond kernels were assigned to be between 63.26 (fresh almond) and 68.84% (5% brine) to 23.10 (5% brine) and 26.83% (fresh almond), respectively. It was observed that almond samples were rich in potassium, followed by P, S, Ca, Mg, Zn, Fe, Mn and B in decreasing order. Protein contents of fresh and fermented almond samples varied between 21.62 (10% brine) and 27.37% (fresh almond). According to these results, consuming fresh almonds with high phytochemical properties in fermented form will create a different consumption branch of almonds. graphical abstract Fullsize Image

The amounts of total phenol and flavonoid of Elaeagnus flowers and fruit collected at different maturity stages were between 234.94 (18 August) and 922.62 mg GAE/100 g (1 August) and 73.93 (4 October) and 525.36 mg/100 g (flowering stage), respectively. The antioxidant capacity of Elaeagnus flowers and fruit was between 3.57 (30 October) and 12.16 mmol/kg (1 August). While the total phenol and antioxidant capacity of the samples was at the highest levels in the first flowering period and the second harvest period, it decreased significantly in the other harvest periods. Gallic acid and 3,4-dihydroxybenzoic acid values of Elaeagnus fruit collected at different maturity stages were between 4.29 (flowering stage) and 130.29 mg/100 g (3 September) and 1.13 (3 September) and 13.42 mg/100 g (4 October), respectively. The P and K values of fruit samples were between 374.89 (20 November) and 2125.18 mg/kg (flowering stage) and 4348.70 (20 September) and 10158.48 mg/kg (flowering stage), respectively. In general, there was a significant decrease in the majority of the phenolics of Elaeagnus fruit harvested on 30 October. The gallic acid content of Elaeagnus increased significantly after the flowering phase. In general, the protein and mineral contents of buckthorn fruit were detected at very high levels in the first three periods of harvesting, while they decreased significantly at other times. The element with the highest concentration in Elaeagnus fruit was K, followed by Ca, P, S, Mg, Fe, Mn, Zn, B, and Cu in decreasing order. Graphic abstract

Chlorophyll b quantities of raw (control) and roasted rapeseed samples were specified to be higher than chlorophyll a. Additionally, total phenol, total flavonoid quantities and antioxidant activity (DPPH and FRAP assays) values of roasted powdered and whole rapeseed samples were observed to increase compared to the control. K232 and K270 values of conventional oven roasted, ground and whole rapeseeds were slightly higher than the results in the microwave. The highest K232 value was observed in oil provided from the sample that was powdered and heat treated in conventional oven. The phenolic constituents of ground and whole rapeseeds were partially higher than those of their oils. The dominant fatty acids of the oils extracted from unroasted and roasted rapeseeds were oleic, linoleic, linolenic and palmitic acids in decreasing order. Oleic acid quantities of the oil provided from powdered and whole rapeseeds roasted in microwave and oven were defined as 62.00 and 61.97% to 61.48 and 62.06%, respectively. The main variables of PC1 for rapeseed were dedected as catechin (0.912), coumaric acid (0.840) and ferulic acid (0.733). Graphical Abstract In this study, the role of oven and microwave roasting on the oil, chlorophyll, total phenol, flavonoid contents, antioxidant activities (DPPH and FRAP assays), specific absorbance (K232, K270) values, phenolic profile and fatty acid compositions of rapeseed was revealed

The physical, chemical, phenolic constituents, fatty acids and mineral contents of the breads produced from wheat flour and turpentine paste at different concentrations were analysed by chromatographic and spectrophotometric methods. L*, a* and b* results of the breads were equal to 49.28–74.51, 0.90–6.55 and 13.45–20.19, respectively. Total phenolic and flavonoid quantities of the breads prepared by adding turpentine fruit paste at different concentrations were depicted to be between 26.15 (control) and 222.66 mg GAE/100 g (20%) to 74.52 (control) and 389.29 mg/100 g (20% turpentine fruit paste), respectively. Also, antioxidant activities of breads with turpentine paste were assigned to be between 2.44 (control) and 7.29 mmol kg⁻¹ (20% turpentine paste). Gallic acid amounts of the breads were specified to be between 3.51 (control) and 16.98 mg/100 g (20% turpentine paste). Oleic and linoleic acid values of the bread oils were depicted to be between 45.34 (control) and 53.66% (3%) to 23.66 (3%) and 26.35% (control), respectively. K, P, S, Ca and Mg were the most abundant elements of bread samples. The changes in physical, chemical, phenolic components, fatty acids and mineral contents and sensory properties of the breads produced with turpentine paste added to wheat flour at different concentrations were determined.

In this study, bioactive compounds, antioxidant activity, phytochemicals, fatty acid compositions, elements and sensory characteristics of the breads prepared using wheat flour and nutmeg powders at different concentrations were investigated. The results obtained regarding the physical and chemical properties of nutmeg breads exhibited some changes based on the nutmeg amounts added in bread production. Also, ‘L*’ results of the breads changed between 70.85 (1.0%) and 76.09 (0.5%). In addition, ‘a*’ and ‘b*’ results of breads with nutmeg powder were assigned to be between 0.47 (0.5%) and 1.93 (2.0%) to 18.44 (2.0%) and 20.42 (0.5%) and 1.93 (0.5%), respectively. Total phenol and flavonoid amounts of breads were established between 24.64 (0.5%) and 47.58 mg GAE per 100 g (2.0%) to 10.71 (control) and 177.38 mg per 100 g (2.0%), respectively. An increase in the redness value was monitored in nutmeg bread added at the rate of 1% and 2%. The amounts of phenolic constituents in the breads fluctuated depending on the added nutmeg concentrations. Gallic acid and 3,4‐dihydroxybenzoic acid values of the breads were stated to be between 2.66 (2.0%) and 6.66 mg per 100 g (1.0%) to 1.48 (2.0%) and 2.71 mg per 100 g (control), respectively. Phosphorus and potassium quantities of the breads were found between 743.60 (control) and 810.50 mg kg⁻¹ (0.5%) to 2077.37 (1.5%) and 2345.42 mg kg⁻¹ (0.5%), respectively. The dominant fatty acids in bread oils were myristic, palmitic, oleic and linoleic acids. It can be seen that the addition of nutmeg in high concentration decreased the consumer's taste. In addition, the added nutmeg increased the colour value of the bread and corrected the textural structure.

In this study, the changes in the bioactive components, antioxidant properties and phenolic compositions of the hydrosols of the aerial parts of Satureja hortensis, Petroselinum crispum, Thymus siypleus, Rosmarinus officinalis and Salvia officinalis plants obtained at different distillation times were investigated by spectrophotometric and HPLC. Total phenolic amounts of the summer savory and thyme hydrosols were assigned to be between 362.30 (60 min) and 442.46 mg gallic acid equivalent (GAE)/L (120 min) to 363.10 (1.min (initial stage)) and 625.79 mg GAE/L (120 min), respectively. In addition, total phenolic amounts of the parsley hydrosols changed between 1.98 (120 min) and 14.84 mgGAE/L (1.min). Total flavonoid values of the summer savory and thyme hydrosols were specified to be between 21.43 (60 min) and 35.71 mg/L (120 min) to 50.00 (1.min) and 92.86 mg/L (120 min), respectively. In general, the highest total phenol, total flavonoid and antioxidant activity values were determined in hydrosols of summer savory and thyme plants. Although there were partial differences between the values of bioactive properties of parsley, rosemary and sage hydrosols, they were found to be close to each other. The catechin amounts of the summer savory and thyme hydrosols obtained in different distillation times were identified between 12.86 (1.min) and 216.47 mg/L (120 min) to 17.12 (1.min) and 126.25 mg/L (120 min), respectively. The catechin contents of the parsley and rosemary hydrosols changed between 23.44 (1.min) and 215.83 mg/L (120 min) to 24.35 (1.min) and 123.20 mg/L(120 min), respectively. The majority of the phenolic compounds of the hydrosols showed an increase at 60 and 90 min of distillation. Graphical Abstract In this study, the changes in the bioactive components, antioxidant properties and phenolic compositions of the hydrosols of the aerial parts of Satureja hortensis, Petroselinum crispum, Thymus siypleus, Rosmarinus officinalis and Salvia officinalis plants obtained at different distillation times were investigated.

In this study, the role of germination times and malt production preliminary stages on the bioactive and phenolic compounds and antioxidant activity of barley grains was investigated. Antioxidant activity values of barley, soaked barley and dried barley have been reported between 5.00 mmol/kg (barley) and 6.65 mmol/kg (sokaed barley). The total phenol and flavonoid quantities of the barley, soaked barley and dried barley samples were recorded to be between 58.49 (dried barley) and 69.10 mgGAE/100 g (soaked barley) to 145.22 (dried barley) and 157.75 mgQE/100 g (soaked barley), respectively. The total phenol content of green malt and dried‐roasted malt were recorded to be between 115.85 (3rd day) and 237.80 mgGAE/100 g (7th day) to 111.83 (3rd day) and 346.04 mg GAE/100 g (7th day), respectively. While catechin amounts of barley samples are registrated between 5.83 (dried barley) and 10.29 mg/100 g (soaked barley), catechin amounts of green and dried‐roasted malt samples were identified between 5.20 (malt for 3rd day) and 56.42 mg/100 g (malt for 7th day). In general, an increase in the phenolic components of green and dried‐roasted malt samples was observed with germination.

In the present study, the effect of microwave roasting on the total phenolic quantities, antioxidant activities, phenolic constituents, fatty acids and tocopherol amounts of the pistachio kernel and oil was revealed. The moisture, oil, total phenolic amounts and antioxidant capacity value of raw and roasted pistachio nuts were assessed as 31.13%, 28.58%, 34.79 mgGAE/100 g and 0.75%–3.18%, 56.91%, 18.80 mgGAE/100 g and 2.26%, respectively. The raw pistachio nut contains 1.90 gallic acid, 0.22 3,4‐dihydroxybenzoic acid, 0.87 (+)‐catechin, 0.15 1,2‐dihydroxybenzene, 0.15 rutin trihydrate, 0.16 resveratrol, 0.1 quercetin, 0.19 kaempferol and 0.24 mg/100 g isorhamnetin. In addition, microwave‐roasted nuts contained 0.75 gallic acid, 0.62 3,4‐dihydroxybenzoic acid, 0.83 (+)‐catechin, 0.47 1,2‐dihydroxybenzene, 0.21 syringic acid, 0.17 caffeic acid and 0.17 mg/100 g quercetin. The raw and roasted pistachio nut oils contained 74.12% and 71.16% oleic, 13.76% and 15.23% linoleic, 8.16% and 8.92% palmitic and 2.09% and 2.10% stearic acids, respectively. The oil samples of the raw and roasted kernels contained 8.15 and 0.00 α‐tocopherol, 63.78 and 7.60 β‐tocopherol, 8.72 and 7.40 ɣ‐tocopherol and 5.61 and 6.77 mg g⁻¹ δ‐tocopherols, respectively. The total phenolic quantity of the pistachio kernel roasted by microwave decreased significantly. Phenolic compounds of the pistachio kernel showed partial differences depending on microwave heating. Differences were monitored in the fatty acid profiles of Pistachio kernel oils. β‐tocopherol quantity of the oil of the pistachio kernel heated by microwave significantly decreased.

In this study, the effects of different roasting techniques on the oil content, bioactive compounds, antioxidant activity, phenolic components, fatty acid and mineral contents of mahaleb seeds, which can be used instead of vanilla, were investigated spectrophotometric and chromatographic systems. The oil quantities of the mahaleb seeds were assessed to be between 30.34% (control) to 34.08% (conventional oven). The total phenolic and flavonoid quantities were assigned to be between 34.37 (control) and 46.61 mg gallic acid equivalent (GAE/)/100 g (microwave) to 82.62 (conventional oven) and 94.21 mg quercetin equivalent (QE)/100 g (microwave), respectively. Antioxidant capacity values of untreated and roasted mahaleb seeds were assessed to be between 1.89 (control) and 2.03 mmol Trolox equivalent (TE) kg⁻¹ (conventional oven). L* values of mahaleb seeds were established to be between 53.04 and 83.40, and a decrease was observed in L* values after heat treatment. Caffeic acid and rutin values of the mahaleb seeds were established between 344.84 (oven) and 641.86 (control) to 18.53 (control) and 146.52 mg/100 g (oven), respectively. The dominant fatty acids of the mahaleb oils were oleic, linoleic and palmitic acids. Phosphorus (P) and potassium (K) quantities of the mahaleb seeds were established to be between 4988.11 (control) and 5280.93 mg kg⁻¹ (oven) to 8025.94 (oven) and 8462.66 mg kg⁻¹ (microwave), respectively. The roasting process had an effect on the bioactive components, fatty acids and element contents of mahaleb seeds.