A 10% (w/v) aqueous solution of flower powder samples was used to determine pH with a pH meter (pH/Ion Model, Eutech Instruments Pte Ltd., Singapore). Water activity was measured in Sprint TH-500 Novasina Thermoconstanter at 25 °C (Lachen, Switzerland). The color coordinates, L* (lightness), a* (±red-green), and b* (±yellow-blue), were measured in the CIELab color space with the help of CM-2600d colorimeter (Minolta Camera Co., Osaka, Japan). The colorimeter was used in SCI mode, D65 as an illuminant, and 10° as an observer. The aperture for illumination and measurement was 11 mm and 8 mm, respectively. The colorimetric values hue (h* = tan−1 b*/a*) and chroma (C* = (a*2 + b*2)1/2) were also calculated. Bulk density was expressed as weight of the sample in kg per unit volume of the powder flower (kg/m3).
Cm 2600d colorimeter
Manufactured by Konica Minolta
Sourced in Japan
The CM-2600d colorimeter is a device designed to measure and analyze the color characteristics of various materials and surfaces. It provides objective color data, including CIELAB values, that can be used for quality control, product development, and color matching purposes. The CM-2600d offers high-precision color measurement capabilities in a compact and user-friendly design.
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Lab products found in correlation
3 protocols using cm 2600d colorimeter
1
Physicochemical Analysis of Flower Powder
2
Colorimetric Monitoring of Intelligent Films
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The L*, a*, b*, and ΔE values of the samples (strips: 20 mm × 40 mm) at different pHs and concentrated NH3 condition were tested by using CM-2600d colorimeter (KONICA MINOLTA, Tokyo, Japan).
The chroma-response of the intelligent films to buffer solutions (pH = 3.0 to 10.0) was tested after the samples were immersed in 10 mL of buffer solutions for a certain time. Subsequently, the sample’s color was tested.
Before NH3-response test, the samples were stored first in containers with relative humidity of 33%, 75%, and 90% for 12 h at 25 °C. Afterwards, 5 mL of ammonia was added into the containers. The chroma parameters of the samples were tested after 10 min.
The chroma-response of the intelligent films to buffer solutions (pH = 3.0 to 10.0) was tested after the samples were immersed in 10 mL of buffer solutions for a certain time. Subsequently, the sample’s color was tested.
Before NH3-response test, the samples were stored first in containers with relative humidity of 33%, 75%, and 90% for 12 h at 25 °C. Afterwards, 5 mL of ammonia was added into the containers. The chroma parameters of the samples were tested after 10 min.
3
Quality Assessment of Grape Bunches
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The weight of the bunches (2 bunches per each crate) was carefully measured using a technical balance (Adam Equipment Co. Ltd., Milton Keynes, U.K.). The total sugars (°Brix) of 30 berries from different bunches (10 berries from 3 bunches from each treatment group and sampling time)
were measured using a digital refractometer (ATAGO CO. Ltd., Tokyo, Japan).
The colour of 30 berries from different bunches (10 berries from 3 different bunches per treatment, the same berries until the end of the experiment) was assessed at the beginning of the experiment and at 20% and 35% w.l. with a CM-2600d colorimeter (Konica Minolta Inc., Ramsey, NY) set at SCE (specular component excluded) measuring CIELAB coordinates L, a, and b. The hue angle (h°) was calculated as h° = arctan (b/a).
Carbon dioxide (CO2) production was measured by placing few bunches inside a glass jar (three jars per treatment), tightly capped with a lid, for 2 hours. CO2 production rate was monitored by gaschromatographic method using a GC Clarus 400 (shincarbon ST 80/100 column, TC detector, Perkin Elmer Inc., MA, USA). The activity was expressed as ml of CO2/ kg h.
were measured using a digital refractometer (ATAGO CO. Ltd., Tokyo, Japan).
The colour of 30 berries from different bunches (10 berries from 3 different bunches per treatment, the same berries until the end of the experiment) was assessed at the beginning of the experiment and at 20% and 35% w.l. with a CM-2600d colorimeter (Konica Minolta Inc., Ramsey, NY) set at SCE (specular component excluded) measuring CIELAB coordinates L, a, and b. The hue angle (h°) was calculated as h° = arctan (b/a).
Carbon dioxide (CO2) production was measured by placing few bunches inside a glass jar (three jars per treatment), tightly capped with a lid, for 2 hours. CO2 production rate was monitored by gaschromatographic method using a GC Clarus 400 (shincarbon ST 80/100 column, TC detector, Perkin Elmer Inc., MA, USA). The activity was expressed as ml of CO2/ kg h.
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