Functional properties and biological activities of perilla seed meal protein hydrolysates obtained by using different proteolytic enzymes

In this study, we aimed to determine the potential functional properties and biological activities of the hydrolysates of perilla seed meal (PSM), which is a by-product of perilla seed oil extraction. PSM protein was hydrolyzed independently by using five proteases, and their functional and biological properties were analyzed. PSM protein hydrolysate exhibited high solubility at most of the tested pH values, and the trypsin-treated hydrolysate exhibited the highest water and oil absorption capacity. The neutrase-treated hydrolysate was most effective in scavenging the 1,1-diphenyl-2-picrylhydrazine radicals, whereas the pepsin-treated hydrolysate showed the highest angiotensin I-converting enzyme inhibitory effect, and anti-inflammatory activity. Trypsin-treated hydrolysate exhibited the highest scavenging activity against of 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid radicals with the IC₅₀ of 109.72 µg/mL. The results of the present study suggest that the type of protease used for the treatment significantly influences the functional properties and biological activities of the resulting PSM protein hydrolysates.

Effects of replacing soybean meal with perilla seed meal on growth performance, and meat quality of broilers

The purpose of this study was to evaluate effects of replacing soybean meal with perilla seed meal (PSM) on growth performance, proximate composition of meat, meat quality, and fatty acids composition of meat in broilers. A total of 60 one-day-old chicks of ROSS 308 (initial body weight of 44.8 ± 0.4 g) were randomly allotted to four treatment groups (15 replicate cages with 1 broilers per cage) in a period of 5 weeks. Dietary treatments included control (CON) basal diet (corn-soybean meal-based diets) and test diets in which PSM was included at 0.5% (T1), 1% (T2), or 2% (T3) to gradually replace soybean meal. At the end of experiment, all broilers were slaughtered for collecting breast and thigh meat. At 5 weeks, T2 and T3 treatment groups had higher (p < 0.05) body weights than CON and T1 treatment groups. Weight gain was increased (p < 0.05) in T2 and T3 treatment groups. Feed intake was decreased (p < 0.05) in T3 treatment group. Broilers in T2 treatment group had lower (p < 0.05) feed conversion ratio than those in other treatment groups. In proximate composition of breast meat, there was no significant (p > 0.05) difference in moisture and ash. Fat composition of breast meat was significantly (p < 0.05) increased in T2 and T3 treatment groups. Regarding meat quality, broilers fed T3 diet had higher (p < 0.05) water holding capacity than those fed other diets. Regarding fatty acids composition of thigh meat, broilers fed T3 diet had higher (p < 0.05) linolenic acid than those fed other diets. In conclusion, soybean meal replaced by 2% perilla seed meal in broiler diet can improve growth performance, meat quality, and fatty acids composition of thigh meat in broilers. Perilla seed meal can be a lot of potential alternatives feedstuff for soybean meal in this study.

Enzymatic hydrolysis of perilla seed meal yields water-soluble dietary fiber as a potential functional carbohydrate source

This study was conducted with an aim to produce a novel water-soluble fiber (WSF) by enzymatic hydrolysis of perilla seed meal (PSM), which could be used as a functional food material. The cellulose fraction (CF) and hemicellulose fraction (HF) derived from PSM were hydrolyzed using Celluclast 1.5 L and Viscozyme L, respectively. Although WSF produced from PSM had low acetylcholinesterase inhibitory activity, WSF exhibited excellent antioxidant, antidiabetic and anti-dementia activities, and effectively delayed the diffusion of glucose and bile acid from the dialysis membranes. In particular, WSF produced from CF showed a significantly higher bile acid retarding index than pectin, and WSF obtained from HF had low IC₅₀ values for radical scavenging activity and reducing power. Thus, these results suggest that the WSF derived from PSM by enzymatic hydrolysis can be used as functional carbohydrate source such as additive and a dietary supplement in the food industry.

Production of eicosapentaenoic acid by application of a delta-6 desaturase with the highest ALA catalytic activity in algae

Dunaliella salina is a unicellular green alga with a high α-linolenic acid (ALA) level, but a low eicosapentaenoic acid (EPA) level. In a previous analysis of the catalytic activity of delta 6 fatty acid desaturase (FADS6) from various species, FADS6 from Thalassiosira pseudonana (TpFADS6), a marine diatom, showed the highest catalytic activity for ALA. In this study, to enhance EPA production in D. salina, FADS6 from D. salina (DsFADS6) was identified, and substrate specificities for DsFADS6 and TpFADS6 were characterized. Furthermore, a plasmid harboring the TpFADS6 gene was constructed and overexpressed in D. salina. Our results revealed that EPA production reached 21.3 ± 1.5 mg/L in D. salina transformants. To further increase EPA production, myoinositol (MI) was used as a growth-promoting agent; it increased the dry cell weight of D. salina transformants, and EPA production reached 91.3 ± 11.6 mg/L. The combination of 12% CO₂ aeration with glucose/KNO₃ in the medium improved EPA production to 192.9 ± 25.7 mg/L in the Ds-TpFADS6 transformant. We confirmed that the increase in ALA was optimal at 8 °C; the EPA percentage reached 41.12 ± 4.78%. The EPA yield was further increased to 554.3 ± 95.6 mg/L by supplementation with 4 g/L perilla seed meal (PeSM), 500 mg/L MI, and 12% CO₂ aeration with glucose/KNO₃ at varying temperatures. EPA production and the percentage of EPA in D. salina were 343.8-fold and 25-fold higher than those in wild-type D. salina, respectively.

IMPORTANCE

FADS6 from Thalassiosira pseudonana, which demonstrates high catalytic activity toward α-linolenic acid, was used to enhance EPA production by Dunaliella salina. Transformation of FADS6 from Thalassiosira pseudonana into Dunaliella salina with myoinositol, CO₂, low temperatures, and perilla seed meal supplementation substantially increased EPA production in Dunaliella salina to 554.3 ± 95.6 mg/L. Accordingly, D. salina could be a potential alternative source of EPA and is suitable for its large-scale production.

Preparative separation and purification of rosmarinic acid from perilla seed meal via combined column chromatography

In this study, the preparative separation and purification of rosmarinic acid (RA) from perilla seed meal (PSM), which is a by-product of edible oil production, was achieved using combined column chromatography over macroporous and polyamide resins. To optimize the RA enrichment process, the performance and separation characteristics of nine selected macroporous resins with different chemical and physical properties were investigated. SP825 resin was the most effective: the content of RA increased from 0.27% in the original extract to 16.58% in the 50% ethanol fraction (a 61.4-fold increase). During further purification treatment on polyamide resin, 90.23% pure RA could be obtained in the 70% ethanol fraction. RA with a higher purity (>95%) could also be easily obtained using one crystallization operation. The proposed method is simple, easily operated, cost-effective, and environmentally friendly and is suitable for both large-scale RA production and waste management.