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19 protocols using ta universal analysis

1

Differential Scanning Calorimetry of Protein-Rich Samples

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Thermal analyses were performed with a TA instrument DSC Q1000 (TA Instruments, New Castle, DE, USA), with a nitrogen flow of 50 mL/min and a pressure of around 20 PSI in the nitrogen cylinder. The protocol was adapted from Martin et al. [26 (link)] and Calderón-Chiu et al. [56 (link)], with some modifications. Indium in a non-hermetic coated aluminum pan was used as calibration, and an empty non-hermetic pan was used as reference. About 2.5–8 mg of samples [56 (link)] (containing between 20% and 57% protein) were weighed in non-hermetic pans and then sealed with the appropriate lids using a sample encapsulation press (TA Instruments, New Castle, DE, USA). The temperature scans were performed from 10 °C to 200 °C in linear mode at a rate of 2 °C/min [26 (link)]. Data were collected using TA instrument explorer (TA Instrument Inc.) and analyzed using TA Universal Analysis (TA Instrument Inc.). The peak area was determined using the “Integrate Peak Linear” tool. Analyses were performed in triplicate.
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2

Thermal Analysis of Lactomorphin and Trehalose

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Using conditions similar to previously reported [18 (link),19 (link),21 (link),22 (link),24 (link),25 (link),26 ,27 (link)]. Thermal analysis and phase transition measurements for raw Lactomorphin, raw Trehalose, SD, and co-SD formulations were studied. Thermograms obtained using the TA Q1000 differential scanning calorimeter (DSC) (TA Instruments, New Castle, DE, USA), with T-Zero®technology, automated computer-controlled RSC-90 cooling accessory, autosampler. A mass of the 1–3 mg sample was carefully weighed into hermetic anodized aluminum DSC pan. The T-Zero® DSC pans were hermetically sealed with the T-Zero hermetic press (TA Instruments). An empty hermetically sealed aluminum pan was used as a reference. DSC measurements were performed at the heating rate of 5.00 °C/minute from 0.00 °C to 300 °C. UHP nitrogen gas was used as the purging gas at a purge rate of 50 mL/min. The glass transition temperature (Tg) and the melting point (Tm) were measured and calculated using TA Universal Analysis (TA Instruments). Furthermore, to ensure reproducibility, all measurements were carried out in triplicate (n = 3).
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3

Thermal Analysis of Powder Formulations

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Thermal analysis of powders was performed using a Q20 DSC (TA Instruments, New Castle, DE, USA). Approximately 6 mg of the SD formulations were loaded into a Tzero pan. For SFD formulations, approximately 3 mg of powder was loaded due to the lower density of the powder. The pans were press-sealed with a hermetic lid, and a hole was then pierced to enable evaporation of water. Pan temperature was first lowered to 10 °C per minute to −40 °C, then ramped from −40 to 200 °C using a modulated DSC cycle of ±0.5 °C every 40 s with a ramp rate of 2 °C per minute. A starting temperature of −40 °C was selected to enable accurate detection of any potentially low Tg values. Data was processed using TA Universal Analysis (TA Instruments).
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4

Quantifying Crystallinity in Hydrogel Fibers

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The degree of crystallinity of hydrogel fibers and materials was assessed using a DSC instrument (2920 TA instrument). The PVA hydrogels were analyzed in the desiccated state. A small quantity of sample (1–15 mg) was loaded into a crucible (TA instrument T81006) and inserted into a temperature-controlled DSC cell. A blank crucible served as a reference. The sample was heated from 30 °C to 300 °C in air, with a heating rate of 20 °C/min. The differential heat flow to the sample and reference was recorded by the instrument. To determine the melting fusion enthalpy of endothermic peaks, heat flow (mW) over sample weight (mg) was plotted against time (s). The areas of melting endothermic peaks were integrated using TA analysis software (TA Universal Analysis). The degree of crystallinity α was estimated using the equation: α=HmHm100%, where Hm (J/g) was calculated from the integration of melting endothermic peaks and Hm (150 J/g) was the enthalpy of melting 100% of PVA crystallites. For representative DSC data, each sample was repeated three times with similar results. The crystallinity outcomes of PVA samples are presented in Supplementary Table 1.
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5

Thermal Degradation Analysis of Edible Mushrooms

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A. bisporus and P. eryngii mushrooms were first washed with water and then allowed to air dry for 7 d. All dehydrated mushrooms were then ground into a fine powder using a coffee grinder.
Fungal fruiting body thermal degradation properties were assessed using a TA Instruments TGA550 thermogravimetric analyzer (TGA). Dry mushroom powder samples of ≈10 mg were placed in an alumina high temperature crucible and heated from 30 to 1000 °C at a heating rate of 20 K min‐1. Samples were tested in air and nitrogen atmospheres (both 25 mL min−1). Thermal degradation properties were then analyzed using TA Universal Analysis (v. 4.5A b. 4.5.0.5).
Larger quantities of pyrolyzed mushroom powder for additional tests were obtained using a Mettler Toledo TGA/DSC 1 STARe system and deep alumina crucibles (maximum sample mass of 4 g). Samples were run isothermally at 1000 °C for 15 min in a nitrogen atmosphere.
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6

Thermal Analysis of Peptide and Carbohydrate Formulations

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Using conditions similar to previously reported [24 (link),28 (link),29 (link),30 (link),46 (link),47 (link),48 (link),49 (link)], thermal analysis and phase transition measurements of Ang (1—7), PNA5, and Trehalose (all unprocessed), SD, and co-SD formulations were studied. The thermograms were obtained using the TA Q1000 differential scanning calorimeter (DSC) (TA Instruments, New Castle, Delaware). A mass of 3–5 mg of each sample was weighed into hermetic anodized aluminum DSC pan. DSC measurements were performed at the heating rates of 5.00 °C/min and 40.0 °C/min from 0.00–300 °C. As a reference, an empty, hermetically sealed aluminum pan was used. The purging gas was nitrogen at a rate of 50 mL/min. Phase transition parameters including the glass transition temperature (Tg), melting point (Tm) main phase transition, enthalpy (ΔH), and heat capacity (ΔCp) were measured and calculated using TA Universal Analysis (TA Instruments). Moreover, to ensure reproducibility, each experiment was repeated three times.
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7

Thermal Analysis of Glycerylphosphorylcholine (GPC)

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The methodology for the DSC analysis was adapted from Ahmad, et al. [21 (link)], with slight modifications. Twelve (12 mg) milligrams of GPC was weighed into aluminium pans (TA Instruments, TZero 901684.901), followed by the addition of 18 mg of Milli-Q water to obtain 30 mg of 40% w/v GPC concentration. The pans were then hermetically sealed and left overnight at 23 ± 2 °C. Scans were then conducted using a differential scanning calorimeter (Q2000, TA Instruments, New Castle, DE, USA) in triplicates, with heating from 20 to 100 °C at a rate of 5 °C/min. The DSC was calibrated with indium and gallium, with empty aluminium pans used as reference. The thermal properties of the GPC were then analysed using an analytical software (TA Universal Analysis, TA Instruments, New Castle, DE, USA). The thermal denaturation temperature (Td) was determined based on the highest peak of the endothermic curve, and the enthalpy was calculated from the area below the transition peak.
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8

Thermal Properties Evaluation of Oleogels

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The thermal properties of oleogels were evaluated using a differential scanning calorimeter, TA Instruments model DSC-2920 (New Castle, USA), with a coupled cooling unit (Refrigerated Cooling Systems). Both a hermetic aluminum pan containing the sample (5–7 mg) and an empty pan used as a reference were placed in the equipment. Samples were initially equilibrated at 0 °C, heated to 100 °C (heating step I), kept in isothermal conditions for 5 min, then cooled to 0 °C (cooling step), kept in isothermal conditions for 30 min, and finally heated to 100 °C again (heating step II). Heating and cooling ramps were performed at a constant rate of 5 °C.min−1. Data were processed by TA Universal Analysis (TA Instruments, New Castle, Delaware, USA) software defining some properties from thermal curves as the crystallization onset temperature (TC1, onset) associated with the first crystallization peak and enthalpy corresponding to both the first (ΔHmI) and second (ΔHmII) heating steps [47 (link)].
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9

Crystallinity Determination of PVA Hydrogels

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The degree of crystallinity of hydrogel fibers and materials was assessed using a DSC instrument (2920 TA instrument). The PVA hydrogels were analyzed in the desiccated state. A small quantity of sample (1-15 mg) was loaded into a crucible (TA instrument T81006) and inserted into a temperature-controlled DSC cell. A blank crucible served as a reference. The sample was heated from 30 °C to 300 °C in air, with a heating rate of 20 °C/min. The differential heat flow to the sample and reference was recorded by the instrument. To determine the melting fusion enthalpy of endothermic peaks, heat flow (mW) over sample weight (mg) was plotted against time (s). The areas of melting endothermic peaks were integrated using TA analyze software (TA Universal Analysis). The degree of crystallinity α was estimated using the equation: α=ΔHmΔHm . 100%, where ΔHm (J/g) was calculated from the integration of melting endothermic peaks and ΔHm (150 J/g) was the enthalpy of melting 100% of PVA crystallites. The crystallinity outcomes of PVA samples are presented in Supplementary Table 1.
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10

Thermal Stability Analysis of MFAps Enzymes

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The Tm of wild-type MFAps and mutants were measured using nano-differential scanning calorimetry (DSC, TA Instruments, Inc., New Castle, Delaware, USA). The pure enzymes were dispersed in dialysis buffer and degassed before scanning. The dialysis buffer was used as a reference, and the sample volume was 0.3 mL. The instrument was balanced for 10 min before each scanning, and the pressure in the pool was maintained for 3 atm during the scanning process. The software of Launch Nano Analyze and TA Universal Analysis were used to calculate and analyze the scanning temperature. All values were determined in triplicate.
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