Hygropalm23 aw

Manufactured by Rotronic

Sourced in Switzerland

The HygroPalm23-AW is a portable handheld instrument designed for measuring and displaying relative humidity and temperature. It features a digital display and is equipped with a fixed probe.

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Lab products found in correlation

Type trumac cn, by Leco (1 mentions) Hq40d, by HACH (1 mentions) Tga 701, by Leco (1 mentions) Genesys 150, by Thermo Fisher Scientific (1 mentions)

3 protocols using hygropalm23 aw

Physicochemical Characterization of Residues

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Changes in the residue composition were measured through physicochemical parameters which are relevant for microbial growth. Portable meters were used to measure water activity (HygroPalm23-AW, Rotronic, Bassersdorf, Switzerland) and pH (HQ40d, Hach Lange GmbH) in the fresh residue samples. A thermogravimetric instrument (TGA-701, Leco) and a C/N analyzer (Type TruMac CN, Leco) were used to measure moisture and organic matter, and carbon and nitrogen on the freeze-dried residue samples, respectively.

Gold M., von Allmen F., Zurbrügg C., Zhang J, & Mathys A. (2020). Identification of Bacteria in Two Food Waste Black Soldier Fly Larvae Rearing Residues. Frontiers in Microbiology, 11, 582867.

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Measuring Water Activity in Dried Samples

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Vacuum dehydrated and spray-dried nostoc samples were taken to a previously calibrated water activity (a_w) determiner, Rotronic brand, model HygroPalm23-AW (Bassersdorf, Switzerland).

Choque-Quispe D., Mojo-Quisani A., Ligarda-Samanez C.A., Calla-Florez M., Ramos-Pacheco B.S., Zamalloa-Puma L.M., Peralta-Guevara D.E., Solano-Reynoso A.M., Choque-Quispe Y., Zamalloa-Puma A., Palomino-Malpartida Y.G., Medina-Quiquin L.D, & Kari-Ferro A. (2022). Preliminary Characterization of a Spray-Dried Hydrocolloid from a High Andean Algae (Nostoc sphaericum). Foods, 11(11), 1640.

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Transparent Edible Film Characterization

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The emulsions were molded on glass plates at room temperature for 24 h, obtaining coating films. The films were conditioned in a quartz vial with a rectangular side, and the transmittance was read at 600 nm in a Thermo Fisher UV-Vis spectrophotometer, model Genesys 150 (Madison, WI, USA) [35 (link)]. Transparency was reported as the ratio between transmittance and thickness (nm/mm).
Samples of 1 cm × 1 cm were taken to a previously calibrated water activity (a_w) determiner, Rotronic brand, model HygroPalm23-AW (Bassersdorf, Switzerland).

Choque-Quispe D., Diaz-Barrera Y., Solano-Reynoso A.M., Choque-Quispe Y., Ramos-Pacheco B.S., Ligarda-Samanez C.A., Peralta-Guevara D.E., Martínez-Huamán E.L., Aguirre Landa J.P., Correa-Cuba O., Agreda Cerna H.W., Masco-Arriola M.L., Lechuga-Canal W.J., Loayza-Céspedes J.C, & Álvarez-López G.J. (2022). Effect of the Application of a Coating Native Potato Starch/Nopal Mucilage/Pectin on Physicochemical and Physiological Properties during Storage of Fuerte and Hass Avocado (Persea americana). Polymers, 14(16), 3421.

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