Grasas y Aceites

Phenol content and β-glucosidase activity during the ripening period of olive fruits (Erkence cv.) from different locations

2023-09-12T14:10:33+02:00

In the present study, Erkence olive fruits were examined during two harvest periods and in two orchards close to the sea at low altitude (A) and far from the sea at higher altitude (B). Olives from the sea-facing northeast (NE) and land-facing southwest (SW) orientations of the trees were analyzed in terms of maturity index, total phenol content, phenolic compounds, β-glucosidase enzyme activity, total protein content and specific enzyme activity. Climate data were collected from the trees and from the meteorology station. The maturity index, β-glucosidase enzyme activity, total protein content and specific enzyme activity of the olives increased during the ripening period. On the other hand, the total phenol content, oleuropein and other phenolic compound contents in the olives decreased. The altitude and location of the fruits on the tree affected the ripening process. Lower altitude and sea-facing side of the tree resulted in an increased enzyme activity, thus aiding in the ripening process.

Use of locust bean flour as a substitute for cocoa in the production of chocolate spread: Quality attributes and storage stability

2024-07-03T13:15:51+02:00

The effects of locust bean (carob) flour (LBF) as a substitute for cocoa in the production, quality attributes, and storage stability of chocolate spreads were investigated. CON (4.5% cocoa), CF15 (3.0% cocoa + 1.5% LBF), CF30 (1.5% cocoa + 3.0% LBF), and CF45 (4.5% LBF) formulations were produced, and stored at 22 and 35 °C for 12 weeks. Appearance, odor, sweetness, color, and overall acceptability scores decreased with increasing LBF, but up to 3.0% LBF did not affect the scores compared to the CON. Replacing cocoa with LBF at a low level resulted in higher hardness and spreadability. Hardness, free fatty acid, and peroxide values (PV) increased, a_w values generally decreased during storage, but PV was still lower than 10 meq O₂/kg. As the LBF ratio increased, darkening occurred in the chocolates. Thus, up to 3% of LBF can be used as a cocoa substitute with minimal quality and sensory changes in the production of chocolate spread.

Evaluation of the efficacy of rice bran and sesame oil for producing nutritionally-superior quality functional tofu

2024-07-03T12:10:11+02:00

Paneer prepared from edible-quality de-oiled soy flour is known as tofu. Functional tofu was augmented with specific antioxidants such as oryzanol and lignan obtained from rice bran oil (RBO) and sesame oil (SO), respectively. All the fortified and control tofu were evaluated for physicochemical (proximate composition, oxidative stability, antioxidant activity, penetration, and color property), microbiological, and sensory properties. The total viable count and yeast and mold counts increased slowly in the samples stored at 4 °C in the refrigerator for 9 days. Fortified tofu showed higher oxidative stability and antioxidant activity than the control tofu during storage conditions. Additionally, tartaric acid-coagulated tofu retained its quality attributes, especially taste and overall acceptability, during refrigerated storage. Functional tofu aided in an innovative technological technique for making functional non-dairy products with boosted healthy constituents.

Exploration of the biochemical composition of Citrus L. seeds for industrial applications

2024-01-09T12:20:58+01:00

This study aimed to assess the biochemical profiles of Citrus L. seeds and elucidate the correlation patterns among varieties based on their biochemical compositions. Samples of Citrus L. seeds were subjected to extraction, and the resulting oils were analyzed for their biochemical levels. Principal Component Analysis (PCA) was usedto unveil the relationship patterns among Citrus L. The research findings revealed that several citrus seeds, including C. Paradise, C. limon (L.) Burm.f., Citrus reticulate, C. maxima (Burm.) Merr., and Citrus sinensis, exhibited similarities in their compositions of flavonoid compounds, phenolic acids, and carotenoids. However, aromatic volatile compounds displayed variations among varieties without discernible patterns of similarity. The N-serotonin compound exhibited significant variations among varieties; whereas fatty acid compounds demonstrated similarities between Citrus latifolia and C. limon (L.) Burm.f. The eight samples showed no similarity in their biochemical variation patterns.

Assessment and comparative analysis of the antioxidant capacity of some food waste for fish oils

2024-01-16T10:06:57+01:00

The aim of the present study was to compare the antioxidant capacities of butylated hydroxyl anisole and tocopherol with polar extracts obtained from some food waste such as date seed, walnut shell, sesame hull, spent coffee and spent black tea. In pursuit of this objective, crude fish oil was employed as a control sample, with all extracts added at a concentration of 200 ppm, equivalent to BHA. The acid, peroxide, conjugated dien, viscosity, total chlorophyll and carotenoid contents in the fish oil were monitored during the storage period (60 days) at 25 °C and 35 °C. The date seed and walnut extracts presented higher antioxidants and oxidative stability than the others at the end of the storage period at both temperatures. The findings of the present study showed that the extracts obtained from food wastes/by-products could be evaluated as a natural source of antioxidants, especially for oils which are highly susceptible to oxidation.

Extraction of healthy oils from fish viscera by conventional and advanced technologies

2023-12-22T09:34:11+01:00

Fish viscera is a by-product of fish processing that has limited use as added-value products. The current issue of circular economy to produce recycled and zero waste products, therefore, the utilization of fish viscera for valuable products is important to explore. One of the valuable components of fish viscera is fish oil, which is characterized by being high in polyunsaturated fatty acids (PUFA). The limited exploration of fish viscera for potential utilization requires a comprehensive review of the visceral characteristics of various fish species. This article reviews the nutritional characteristics of various fish viscera, lipid class composition, fish viscera oil characteristics, and various methods of fish viscera oil extraction, both by conventional and advanced technologies. The main contribution of this review is to provide information about fish viscera, their potential as a source of fish oil, and extraction methods which are suitable for various industrial applications and purposes, including health applications for ω-3 fatty acids.

The impact of pre-drying and different infrared powers on some quality parameters of apple chips fried by vacuum-combined infrared radiation

2023-12-22T08:39:15+01:00

In this study, the use of vacuum-combined infrared radiation (VCIR) as a frying technique for the production of apple chips was investigated. The effects of a pre-drying treatment before frying on the quality parameters of apple chips were also evaluated. While the frying time of apple slices decreased by increasing the infrared power, the browning index value, 5-hydroxymethylfurfural (HMF) content, and oxidation ratio were raised. The frying times, oil contents, browning, and oxidation rates of apple chips were decreased with the pre-drying treatment. The sensory analyzes showed that the samples fried by vacuum-combined infrared radiation had the highest scores in all sensory characteristics than deep-fat fried samples. Pre-dried apple samples (41% moisture) fried at 350W infrared power under 400 mmHg vacuum pressure had the highest score for general acceptance. The results showed that VCIR would be an alternative frying method for producing healthier apple chips with less oil content and higher quality.

Detection of coconut oil adulteration with palm oil through NMR spectroscopic method

2023-12-19T10:20:49+01:00

Coconut oil is a costly commodity in the food and traditional medicinal sectors and its adulteration with cheap palm oil is a serious issue. The present study evaluates the application of ¹H NMR spectroscopy to authenticate coconut oil, and to monitor its adulteration with the cheap palm oil substitute. Various parameters such as average chain length (14.25), saponification index (244.66 mg KOH/100 g), molecular weight (652.12), iodine value (8.27 mg/100 g), peroxide value (0.02 meqO₂/kg) and percentage of unsaturation (7.81%) were calculated through the NMR technique, and were found to be in concurrence with the values obtained from wet lab experiments. The extent of palm oil adulteration can be detected through NMR by evaluating the chemical shift values for olefinic protons. The findings have a significant impact on both the food and traditional medicine sectors, as NMR spectroscopy can replace the conventional wet lab methods as a reliable and precise method for analysis.

Metabolic effects of chia oil in experimental models: a narrative review

2024-01-30T14:21:36+01:00

Chia seeds are a promising food for society and the scientific community because they contain polyunsaturated fatty acids, such as alpha-linolenic acid omega-3, antioxidants, and bioactive compounds. This study aimed to investigate the metabolic effects of chia oil in experimental models which have already been described in the literature. Twenty-two preclinical studies were selected, mostly with rats. The results showed that there is still no consensus on what oil dosage is ideal for generating health benefits, with the doses ranging from 0.1g/mL to 111.1g/mL and supplementation time of 1 to 33 weeks. The studies reported increased liver omega-3 contents, an improved lipid profile, increased HDL-c, and decreased total cholesterol levels. Improved glucose tolerance and insulin sensitivity, and improved antioxidant status. It is concluded that chia oil has shown beneficial metabolic effects in organisms in preclinical studies, acting on glycemic homeostasis, lipid profiles, and oxidative stress markers.

New insights into the oil from the seeds of Cerrado passion fruit (Passiflora cincinnata): physicochemical characterization and stability during storage

2024-03-01T11:29:50+01:00

This study aimed to investigate the chemical composition, rheological behavior, and photostability of Cerrado passion fruit seed oil during 225 days of storage. To this end, the quality indices, fatty acid composition, rheological behavior, and photostability were evaluated. The findings revealed that the oil is notably rich in unsaturated fatty acids. It showed a high concentration of polyunsaturated fatty acids, particularly linoleic acid. Furthermore, the oil showed lower viscosity compared to other vegetable oils. The oil also exhibited better physical-chemical stability when stored under light protection, retaining its color intensity and remaining suitable for consumption for an extended period of up to 135 days. These results highlight the importance of Cerrado passion fruit seed oil as a sustainable and versatile material with potential applications in the food, cosmetic, and pharmaceutical industries.

Processing practices and quality of crude palm oil produced on a small scale in Valença, Bahia, Brazil

2024-02-14T13:18:32+01:00

This study aimed to compare the quality of crude palm oils (CPO) produced from different processing methods in Brazil: traditional (T-CPOE), little-mechanized (LM-CPOE) and semi-mechanized extraction (SM-CPOE). A total of 57 CPO samples were studied. The peroxide value (PV), total carotenoids (TC), oxidative stability index (OSI₁₂₀), deterioration of bleachability index (DOBI), color (CIELab), total polar compounds (TPC) and its fractions, consisting of triacylglycerol polymers (TGP), dimers (TGD), oxidized monomers (oxTGM), diacylglycerols (DAG) and free fatty acids (FFA) were analyzed. Regardless of the extraction method, the PV, TC and OSI₁₂₀ were found to be 3.1-7.6 meqO₂/kg, 375-598 ppm, and 0.6-3.3 h, respectively. T-CPOE samples demonstrated superior quality based on DOBI and TPC. The TPC in the T-CPOE samples were significantly lower (8.7-9.6%) than in the other samples (11.9-18.5%). In all methods, the levels of compounds in the TPC fractions were DAG ≈ FFA > oxTGM > (TGP + TGD). Fruit selection and T-CPOE equipment played crucial roles in reducing oil degradation.

Performance of virgin and refined avocado oils during deep-frying and thermoxidation simulating frying in comparison with olive and sunflower oils

2024-03-15T11:32:12+01:00

Avocado oil stability at frying temperatures has been scarcely studied. In this work, the performance of virgin (VAO), minimally refined (MRAO) and refined (RAO) avocado oils was evaluated in deep-frying and thermoxidation experiments in comparison with sunflower (SO), high-oleic sunflower (HOSO), and virgin olive (VOO) oils. Polar compounds, polymers and tocopherols were determined. For all oils, no significant differences in polymers levels were found after 10h thermoxidation and 9 discontinuous deep-frying operation. The most stable oils were HOSO, VAO, VOO and MRAO, all showing less than 20% polar compounds after 9 frying operations. Besides the stability conferred by the predominant monounsaturated fatty acids (oleic acid), the better frying performance shown by these four oils was attributed to the high content of tocopherols and DMPS in HOSO, and the presence of protective minor compounds in virgin oils (VAO and VOO) and MRAO.

Reviewers List 2023

2024-07-08T13:44:00+02:00