Experimental Study of the Effect of Ultrasound on the Freezing Process of Bo Chinh Ginseng

Reviewer ‘comments

Responses

1. First line of Abstract is stating the justification of work it should come after two or three lines. General statement from the abstract should be removed

Done

2. In line “Therefore, freeze-drying is a promising method to preserve high levels of the valua- 44 ble properties of ginseng. In particular, the first stage of freeze-drying is the freezing stage of the material to completely crystallize the water in the material, which is also an im- 46 portant stage in determining the quality of the material after drying” Add references of previous work as given below.

Comparative Analysis of Freeze Dried and Spray Dried Beet-Root Powder According to Physico- Chemical, Functional and Color Properties Bulletin of the Transilvania University of Brasov, Series II. Forestry, Wood Industry, Agricultural Food Engineering . 2021,Vol. 14 Issue 1, p153-162. 10

Done

3. Introduction is written nicely but lack the proper justification of present work and why the particular research was undertaken should be explained clear. Whereas Introduction is bit lengthy the common information of freezing should be removed.

Done (Add a new paragraph “This study aimed to……”

4. Section“2.3.2 Authors should elaborate the colour analysis process. Why did not the authors is using chroma and hue angle ? add more information on this process with clarification. Whereas Section 2.3.3 should be more explain to get idea about the how was the SEM analysis process was undertaken, also add below references.

Done (Add operating procedures for two processes)

5. Line “ As shown in Figure 2, when increasing the ultrasound power level from 0 to 50W, the freezing time decreased by 23.2%. Increasing the ultrasound power to 100W, the freezing time was only reduced by 7.8% compared to the freezing time at 50W, 15.5% smaller  than the increase from 0W to 50W.” does not give complete information about the results? elaborate it.

Done (Add table 2.1)

6. Line “The nucleation temperature is the lowest supercooling temperature in the cooling  phase and is lower than 00C. At this temperature, the water in the material has not yet crystallized but remains in the liquid phase. The nucleation temperature of water in materials cannot be predicted, but it depends on each material because the materials have different structure and water bonding in each material.” needs improvement. Firstly the general information needs justification from previous literatures with two -three evidence. Add the justification.

Done (line 268-279)

7. Figure in manuscripts are very good and clear, please explain the differences between the  micrographs of e-f and g-h in Figure 10.

Done (line 419-428)

8. The  author has stated in line 392-397 “ Unlike many previous studies, which mainly studied freezing materials embedded  in liquid refrigerants, this study provides quantitative research results on the effects of  ultrasound irradiation in the non-contact freezing process. with the material transmitter  in the air  medium.  At  the  same  time,  the  research  results  have  important  implications  in    choosing  the ultrasound parameters to support the water crystallization phase in the  material as well as promote the water escape from the material at the sublimation drying  stage of the process. freeze drying process at vacuum pressure.” Author needs to reframe it or explain it very carefully as author has reflected many times in manuscripts previous studies, therefore please add that studies here

Done

9. Section 3.2, 3.3 and 3.4  are well explained whereas 3.5 & 3.6 needs improvement

Done

10. Conclusion  should be a complete gist of study in bullet points not the compassion of pervious work.

Done (Replaced the old final paragraphs with a new ones, line 448 – 452)