Storage stability of vitamin C fortified purple mashed potatoes processed with microwave-assisted thermal sterilization system

Juhi Patel; Ashutos Parhi; Zhongwei Tang; Juming Tang; Shyam S. Sablani; Juhi Patel; Ashutos Parhi; Zhongwei Tang; Juming Tang; Shyam S. Sablani

doi:10.48130/FIA-2023-0013

Figures (7) Tables (2)

Figure 1.
Weight loss in polymer pouches during the storage at 37.8 ± 0.2 °C for 7 months.
Figure 2.
Color change in the purple mashed potatoes samples with light exposure and storage at 37.8 ± 0.2 °C for 7 months packaged in the AL-Foil, PAA and TLMO pouches.
Figure 3.
Changes in the total color difference (ΔE) in the packaged purple mash potatoes with and without light exposure during storage for 7 months at 37.8 ± 0.2 °C
Figure 4.
Anthocyanin content in purple mash potato in all the pouches during storage at 37.8 ± 0.2 °C for 7 months.
Figure 5.
Total phenolic content in purple mash potato in all the pouches during storage at 37.8 ± 0.2 ºC for 7 months. The mean values were compared for significant differences for determining the pouch effect (Superscripts: A−D), storage effects (I−II) and processing effects (a−b), respectively.
Figure 6.
Non-encapsulated Vitamin C content in purple mash potatoes in all the pouches including light exposure pouch during storage at 37.8 ± 0.2 ºC for 7 months.
Figure 7.
Non-encapsulated Vitamin C (NVC) and encapsulated Vitamin C (EVC) content in purple mash potatoes in TLMO & PAA pouches during storage at 37.8 ± 0.2 ºC for 7 months. The mean values were compared for significant differences for determining the effect of packaging used (lowercase superscripts), storage (uppercase superscripts) and MATS processing (roman superscripts), respectively.

Package	Structure	Dimensions (L × W)(cm)	Total thickness (µm, n = 5)
TLMO	AlO_x-coated PET (12 µm)//AlO_x-coated PET (12 µm)// AlO_x-coated PET (12 µm)// ONy (15 µm)//CPP (70 µm)	18.5 × 14	121 ± 0.8
PAA	PET (12 µm)//organic coating (1 µm) // ONy (15 µm)//CPP (60 µm)	18 × 13	95 ± 0.4
AL-Foil	PET (12 µm)//aluminum (9 µm)//nylon (15 µm)//PP (80 µm)	21 × 12	120 ± 0.1
ONy and CPP indicate biaxially oriented nylon 6 and cast polypropylene, respectively.

Table 1.

Details regarding the package label, structure, dimensions (length × width), and thickness of multilayer pouches studied.

Pouch type	OTR (cc/m²·day)			WVTR (g/m².day)
Pouch type	Before processing	After processing	After storage at 38ºC/ 7 months	Before processing	After processing	After storage for 38 ºC/ 7 months
TLMO	ND	ND	0.34 ± 0.00^AB	0.13 ± 0.01^aA	0.32 ± 0.08^cB	0.23 ± 0.03^bB
PAA	0.21 ± 0.01^ab	0.19 ± 0.03^a	0.29 ± 0.12^bA	5.92 ± 0.08^aB	12.5 ± 0.89^bA	12.6 ± 0.29^bA
Values are presented as Mean ± SD. Different lowercase and uppercase superscripts show significant differences (P < 0.05) between values within rows and columns, respectively. ND: Not detectable since the value is lower than the instrument’s detection limit. ONy and CPP indicate biaxially oriented nylon 6 and cast polypropylene, respectively.

Table 2.

Oxygen Transmission Rate (OTR) and Water Vapor Transmission Rate (WVTR) of polymer pouches before and after MATS processing and after storage at 37.8 ± 0.2 ºC.