scholarly journals The relationship between colour and pH in cold-stored quail breast muscle / Zależność między barwą a pH w mięśniach piersiowych przepiórek przechowywanych w warunkach chłodniczych

2013 ◽  
Vol 13 (2) ◽  
pp. 401-413 ◽  
Author(s):  
Tadeusz Karamucki ◽  
Józefa Gardzielewska ◽  
Małgorzata Jakubowska ◽  
Kinga Rybak ◽  
Justyna Garczewska
Keyword(s):  
Sensory Evaluation ◽  
Breast Muscle ◽  
Colour Stability ◽  
Muscle Ph ◽  
Old Japanese ◽  
Colour Parameters ◽  
Colour Changes ◽  
Hue Angle ◽  
Ph Range ◽  
High Degree

Abstract The purpose of this study was to analyse the colour of the breast muscles of Japanese Pharaoh quail on the first day after slaughter and again after further six days of cold storage, in relation to their muscle pH. The material for the study consisted of 40 breast muscles taken from the carcasses of six-week-old Japanese Pharaoh quail. Based on pH results, the muscles were divided into three groups: I (pH = 5.51-5.70), II (pH = 5.71-5.90) and III (pH = 5.91-6.10). After this the muscles were stored for a further 6 days at 4°C. It was found that the pH of freshly dissected quail breast muscle is a good indicator of the colour stability of muscles cold-stored at 4°C for six days. The lowest degree of colour stability was observed in the pH range 5.51-5.70. In the sensory evaluation muscles displaying this degree of colour instability were considered unacceptable or barely acceptable. In contrast, muscles in the pH ranges 5.71-5.90 and 5.91-6.10 displayed a high degree of colour stability and were considered acceptable in the sensory evaluation. The colour changes that occurred during storage of the muscles were due to changes in the values of all of the colour parameters (L*, a*, b*, C* and hº); however, the greatest changes were found in the case of redness (a*) and the hue angle (hº). The changes were caused both by alterations in the amount of pigment reached by light, and by changes in the relative amounts of the chemical forms of myoglobin.

scholarly journals Colour and rehydration properties of bay leaves dried by convective and microwave methods

2019 ◽  
Vol 11 (1) ◽  
pp. 80-83
Author(s):  
A. Polat ◽  
N. Izli
Keyword(s):  
Microwave Power ◽  
Microwave Drying ◽  
Convective Drying ◽  
Drying Process ◽  
Rehydration Ratio ◽  
Air Temperatures ◽  
Colour Parameters ◽  
Colour Changes ◽  
Hue Angle ◽  
Increasing Temperature

Abstract. This study aims to evaluate the effect of the convective and microwave dying methods on the colour parameters (L*, a*, b*, C,  and ΔE) and rehydration ratio of bay leaves. Drying experiments were conducted using 350 and 460W of microwave powers and air temperatures of 50, 60 and 70C. Different microwave powers show significant effect on colour of dried bay leaves. Increasing microwave power, a* (redness/greenness),  (hue angle) and ΔE (total colour changes) values increased whereas L* (lightness), b* (yellowness/blueness) and C (Chroma) values decreased. For the convective drying, although there are changes in the values of the colour parameters (L*, a*, b*, C and ), there are no significant differences in the values of the total colour changes (ΔE) statistically (P>0.05). The effect of microwave power levels and air temperature on rehydration characteristics was determined. It was found that the rehydration ratio values decreased with an increasing temperature and increasing power levels. The highest rehydration ratio was recorded for the samples dried at 350W and the lowest ratio was seen in a sample dried at 70°C. Microwave drying can be a practical drying process, an alternative to convective drying for drying bay leaves.

The study of colour changes under artificial weathering of light red meranti and yellow balau wood from Shorea genus

2020 ◽  
Vol 111 ◽  
pp. 37-42
Author(s):  
Agnieszka Jankowska
Keyword(s):  
Uv Irradiation ◽  
Wood Species ◽  
Wood Surface ◽  
Aging Process ◽  
Colour Change ◽  
Colour Stability ◽  
Artificial Weathering ◽  
Colour Parameters ◽  
Colour Changes ◽  
Weathering Process

The study of colour changes under artificial weathering of light red meranti and yellow balau wood from Shorea genus. This paper deals with the change in colour of selected tropical wood species from Shorea genus such as light red meranti and yellow balau. The artificial weathering method was used to determine the colour stability of wood surface. The used ageing method consisted of alternating soaking wood in water, drying at a temperature of 70°C and UV irradiation exposure. The colour changes were evaluated using CIE L*C*h system. Changes of particular colour parameters (lightness L*, chroma C*, hue h) were determine as well as the total colour change ΔE*. The results showed that tested species of wood change their colour similarly under the influence of the artificial weathering (the changes in the tested wood appearance occurred in similar scope). Surfaces of tested wood species initially became darker and then lighter. The largest changes in intensity of the colour of wood took place at the beginning of artificial weathering process. The intensity of changes decreased with the progress of aging process.

scholarly journals Relationships Linking the Colour and Elemental Concentrations of Blossom Honeys with Their Antioxidant Activity: A Chemometric Approach

Agriculture ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 702
Author(s):  
Monika Kędzierska-Matysek ◽  
Anna Teter ◽  
Małgorzata Stryjecka ◽  
Piotr Skałecki ◽  
Piotr Domaradzki ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Physicochemical Properties ◽  
Black Locust ◽  
Antioxidant Properties ◽  
Principal Component ◽  
Botanical Origin ◽  
Antioxidant Parameters ◽  
Colour Parameters ◽  
Hue Angle ◽  
Chemometric Approach

The antioxidant activity of honey depends on the botanical origin, which also determines their physicochemical properties. In this study, a multivariate analysis was used to confirm potential relationships between the antioxidant properties and colour parameters, as well as the content of seven elements in five types of artisanal honey (rapeseed, buckwheat, linden, black locust, and multifloral). The type of honey was found to significantly influence most of its physicochemical properties, colour parameters, and the content of potassium, manganese and copper. Antioxidant parameters were shown to be significantly positively correlated with redness and concentrations of copper and manganese, but negatively correlated with the hue angle and lightness. The principal component analysis confirmed that the darkest buckwheat honey had the highest antioxidant activity in combination with its specific colour parameters and content of antioxidant minerals (manganese, copper and zinc). The level of these parameters can be potentially used for the identification of buckwheat honey.

scholarly journals Color Alteration of Encapsulated Beetroot (Beta vulgaris L.) Extract Upon Dissolving in Various pH Treatment

2020 ◽  
Vol 2 (02) ◽  
pp. 48
Author(s):  
Diah Mustika Lukitasari ◽  
Renny Indrawati ◽  
Rosita Dwi Chandra ◽  
Heriyanto Heriyanto ◽  
Leenawaty Limantara
Keyword(s):  
Beta Vulgaris ◽  
Structural Changes ◽  
Color Difference ◽  
Prolonged Storage ◽  
B Values ◽  
Ph Adjustment ◽  
Natural Pigments ◽  
Hue Angle ◽  
Color Alteration ◽  
Ph Range

It has been known that most natural pigments are unstable upon exposure against several environmental factors, such as thermal treatment, light, oxidizing or reducing agents, as well as acid or alkaline compounds. Encapsulation procedures is often adopted to adjust the solubility and provide protection to the natural pigments. Here, we prepared an encapsulated beetroot extract as the candidate of red bio-colorant. The primary aim of the present study is to investigate color alteration of encapsulated beetroot (Beta vulgaris L.) extract upon dissolving in various pH adjustment and prolonged storage. The McIllvainne buffer was prepared in various pH range, i.e. from 2 to 11. The encapsulated extract (0.1% w/v) was dissolved and the color of the solutions were measured regularly until 3 days storage under darkness at 200C. Any degradation or structural changes will cause color alteration, which were monitored through L*, a*, b* values, the hue angle (H°), chroma values (C), as well as color difference (DE). The results showed that pH 4 was the most favorable condition that brings least impact to the color alteration, even when the colored solution was kept in prolonged storage until 9 days.

scholarly journals Effect of Shading on Red Colour and Fruit Quality in Blush Pears “ANP-0118” and “ANP-0131”

Plants ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 206 ◽  
Author(s):  
Madeleine Peavey ◽  
Ian Goodwin ◽  
Lexie McClymont ◽  
Subhash Chandra
Keyword(s):  
Visual Assessment ◽  
Quality Parameters ◽  
Fruit Weight ◽  
Soluble Solids ◽  
A Value ◽  
Solids Concentration ◽  
Negative Effect ◽  
Colour Parameters ◽  
Hue Angle ◽  
Colour Development

Some cultivars of Pyrus communis develop mature fruit with a distinctive red blush. Investigating the patterns of pear colour development in response to sunlight has implications for orchard management of these pears. The objectives of these experiments are to study the seasonal patterns of colour development and investigate the influence of shade and sunlight exposure on the red colour and harvest quality of blush pears “ANP-0118” and “ANP-0131”. Several long, medium and short shading treatments were applied at different stages of fruit development from 28 (“ANP-0131”) and 29 (“ANP-0118”) days after full bloom (DAFB) until harvests at 119 DAFB (“ANP-0118”) and 175 DAFB (“ANP-0131”). Fruits were measured every three weeks for colour parameters (a*, hue angle, chroma) and at harvest for quality parameters (fresh weight, visual assessments of percentage blush coverage and blush intensity, flesh firmness and soluble solids concentration). In the unshaded control, red colour increased during the growing season (increase in a* value and decrease in hue angle), as well as increasing in chroma value. Periods of shading during the season negatively affected red colour in both cultivars, as evidenced by significant decreases in a* value and increases in hue angle. Shaded fruits that were subsequently re-exposed to sunlight reacted with a dynamic increase in a* value and decrease in hue angle. Fruit shaded for the length of the experiment or prior to harvest had significantly lower a* values than the control at harvest. Visual assessment at harvest of percentage blush coverage and blush intensity were significantly affected by shading in both cultivars. Shading treatments applied early in the experiment had a negative effect on the fresh fruit weight of “ANP-0118”.

scholarly journals Use of colour parameters for roasted coffee assessment

2012 ◽  
Vol 32 (3) ◽  
pp. 436-442 ◽  
Author(s):  
Natalina Cavaco Bicho ◽  
António Eduardo Leitão ◽  
José Cochicho Ramalho ◽  
Fernando Cebola Lidon
Keyword(s):  
Ether Extract ◽  
Roasted Coffee ◽  
Robusta Coffee ◽  
Coffee Beans ◽  
Colour Parameters ◽  
Colour Changes ◽  
Technological Quality ◽  
Non Destructive ◽  
Roasted Coffee Beans

Fast and non-destructive indicators were evaluated as tools to measure the technological quality of Arabica and Robusta coffee. Accordingly, considering the roasting intensity in highly valuable commercial samples, volume, mass, apparent density, moisture, total ash, ash insoluble in hydrochloric acid, and ether extract were characterized. The chromatic parameters L*, C*, Hº were measured using illuminants D65 and C. It was found that in roasted coffee beans, the parameters L*, C*, Hº, and coordinate b* had an antagonist interaction due to an increase in the roasting intensity, whereas after milling, only L* and Hº decreased progressively. Considering that the parameters L* and Hº followed similar patterns using both illuminants, D65 and C, it can be concluded that they are appropriate to evaluate coffee colour changes during roasting, enabling a relationship with coffee quality.

Standardization of formulation and processing conditions for development of nutritional carabeef cookies

2015 ◽  
Vol 45 (5) ◽  
pp. 677-687 ◽  
Author(s):  
Meena Goswami ◽  
B. D. Sharma ◽  
S. K. Mendiratta ◽  
Vikas Pathak ◽  
R. R. Kumar ◽  
...  
Keyword(s):  
Sensory Evaluation ◽  
Economic Status ◽  
Proximate Analysis ◽  
Vital Role ◽  
Consumption Pattern ◽  
Content Type ◽  
Fat Replacers ◽  
Snack Foods ◽  
Significant Difference ◽  
Hue Angle

Purpose – The purpose of this study is to standardize baking time–temperature processing of nutritional carabeef cookies to improve carabeef meat consumption for malnourished women and children. Design/methodology/approach – Preliminary trails were done to optimize carabeef powder level replacing refined wheat flour to develop carabeef cookies. The selected carabeef cookies on the basis of sensory evaluation were baked at three different baking time–temperature combinations viz. 150-160°C for 35-40 minutes, 170-180°C for 25-30 minutes and 190-200°C for 15-20 minutes. These three treatments were evaluated for various physicochemical properties, proximate analysis, color values, instrumental texture parameters and sensory evaluation. Findings – Mean pH, diameter and proximate parameters like moisture, protein, fat and ash percentage had no significant difference at a higher baking temperature, whereas mean cooking yield, thickness values decreased, while spread ratio values increased significantly. Instrumental textural parameters, such as hardness, shear force and adhesiveness values increased significantly. Mean yellowness values had no significant difference, whereas mean redness, hue angle and chroma values increased in significant (p < 0.05) manner with a higher baking temperature and lower time combinations. All sensory attributes scores decreased at a higher baking temperature. Carabeef cookies containing 50 per cent carabeef powder and baked at 150-160°C for 35-40 minutes were selected as best treatment. Research limitations/implications – The experiment can be further carried out to improve functional properties with the addition of various fiber sources and fat replacers. Originality/value – Cookies as snack foods have played a vital role in life of human as antiquity and are very much relished by large section of society. The incorporation of carabeef meat may be a very good option to cope up with malnutrition and hunger as well as to improve the consumption pattern of highly nutritional buffalo meat. Carabeef cookies baked at an optimum temperature–time combination had higher nutritional content and acceptability and, thus, could be commercialized to improve socio-economic status and health of consumers.

scholarly journals Water-holding capacity, colour stability and sensory characteristics in meat (M. longissimus dorsi) from reindeer fed two different commercial feeds

Rangifer ◽  
2011 ◽  
Vol 31 (1) ◽  
pp. 49-59 ◽  
Author(s):  
Eva Wiklund ◽  
Lisbeth Johansson
Keyword(s):  
Sensory Evaluation ◽  
Water Holding Capacity ◽  
Longissimus Dorsi ◽  
Colour Stability ◽  
Treatment Groups ◽  
Meat Colour ◽  
Meat Samples ◽  
The Right ◽  
Storage Times ◽  
Water Holding

Twenty reindeer calves (age 10 months) were included in the study. They were all fed one of two different pelleted feed mixtures ad libitum for two months before slaughter. Ten calves were fed a control diet of conventional pellets (CPD) (Renfor Bas, Lantmännen, Holmsund, Sweden) and ten calves received pellets enriched with linseed cake (LPD). The reindeer were slaughtered according to standard procedure at Arvidsjaur Renslakt AB, a reindeer slaughter plant in Arvidsjaur, Sweden. At 1 day post mortem, both longissimus dorsi (LD) muscles from each carcass were excised. The left LD was used for sensory evaluation and the right LD for colour and water-holding capacity measurements. The right LD was cut in 4 pieces that were randomly allocated to storage times of 1 day, 1, 2, or 3 weeks at + 4 °C. Samples allocated for storage were vacuum packaged. Evaluation of meat colour was carried out after each of the four storage times while drip loss/purge was registered after 1, 2, and 3 weeks storage at + 4 °C. The left LD muscles were vacuum packaged, frozen at -20 °C and kept frozen until preparation for sensory evaluation. No significant differences were found in carcass quality (carcass weight, EUROP carcass conformation and fat scores), meat colour stability and water-holding capacity of LD samples when comparing the two treatment groups LPD and CPD. However, sensory panellists judged samples from LPD fed reindeer to have a tendency (not significant) to be more tender (P= 0.06) and juicy (P=0.07) than the meat samples from CPD fed reindeer. No flavour differences were found when comparing meat samples from the two treatment groups.

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