Vitamin C stability in pineapple, guava and baobab juices under different storage conditions using different levels of sodium benzoate and metabisulphite

Antioxidant capacity (AC) of quinoa (Chenopodium quinoa Willd. cv. Real) seeds and sprouts obtained after 4 days of seed germination at 20°C and 70% humidity was evaluated using trolox equivalent antioxidant capacity (TEAC) and oxygen radical absorbance capacity (ORAC) assays, able to highlight reducing activity and peroxyl radical scavenging capacity, respectively; phenolic content (PC) was also measured. Both TEAC and ORAC assays revealed a significantly higher (about 2- and 2.8-fold, respectively) AC of 4-day-old sprouts compared to seeds; consistently, also PC values of sprouts resulted about 2.6 times higher than seeds. In order to investigate the influence of storage on AC and PC, as well as on vitamin C content (VCC), 4-day-old sprouts were subjected for 7 days at 5°C to three different conditions of controlled atmosphere storage (CAS) compared with air. Interestingly, whatever the CAS conditions, storage of quinoa sprouts up to 7 days induced an increase of AC evaluated in terms of reducing activity by TEAC assay. Consistently, an increase of PC and VCC was measured during storage, positively correlated to TEAC values. Moreover, a decrease of peroxyl radical scavenging activity, measured by ORAC, was observed after 7 days of storage, in accordance with a shift of AC towards the reducing activity component. Overall, these findings indicate that sprouting approach using quinoa may provide highly antioxidant-enriched seedlings that may improve nutritional quality of diet or of functional foods. Interestingly, antioxidant properties of quinoa sprouts may be deeply influenced by storage, able to increase reducing activity by increasing phenols and vitamin C.

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Increasing Thai Catfish's Immunity (Pangasius hypophthalmus Fowler) Using Ascorbic Acid

Jurnal Akuakultur Indonesia ◽

10.19027/jai.1.81-86 ◽

2007 ◽

Vol 1 (2) ◽

pp. 81 ◽

Cited By ~ 1

Author(s):

, Ilmiah ◽

D. Dana ◽

F. H. Pasaribu ◽

R. Affandi

Keyword(s):

Ascorbic Acid ◽

Vitamin C ◽

Aeromonas Hydrophila ◽

Challenge Test ◽

Humoral Response ◽

Phagocytic Index ◽

Total Biomass ◽

High Level ◽

Key Words Ascorbic Acid ◽

Different Levels

ABSTRACTAn experiment to determine Thai catfish's (Pangasius hypophthalmus Fowler) immunity was carried out using different levels of ascorbic acid (0, 1.000, 2.000 and 3.000 mg/kg feed). Fish of 15-20 g in weight were kept in aquaria for 6 weeks with density of 15 fish/aquaria. Feed was given at 5-10 % of total biomass with frequency of three times a day. The blood sampling was taken every week and the challenge test with Aeromonas hydrophila (106cells/mm3) injection intramuscular was done on the 30th day. The result of this experiment shown that feed with ascorbic acid of 2.000 mg/kg was elevated the cellular responses such as: leucocyte total (34.850 cels/mm3), differential of leucocyte (lymphocyte: 72,2%, monocyte: 8,0%, neutrophyl: 7,8%), phagocytic index (13%) and humoral response (titre antibody: 0.829 serum aglutination unit), which at the same time proves high level of survival rate against the artificial injection using A. hydrophila. Key words : Ascorbic acid, fish immunity, Thai catfish, Pangasius hypophthalmus. ABSTRAK Suatu penelitian telah dilakukan di laboratorium dengan menggunakan ikan jambal Siam (Pangasius hypophthalmus Fowler) untuk melihat tingkat kekebalan ikan dengan menambahkan vitamin C pada pakan (0, 1.000, 2.000 dan 3.000 mg/kg pakan). Ikan jambal Siam ukuran 15-20 g dipelihara dalam aquarium selama 6 minggu dengan kepadatan 15 ekor/wadah. Pemberian pakan dilakukan 3 kali sehari sebanyak 5-10% dari bobot biomasa, pengambilan contoh darah dilakukan setiap minggu dan uji tantang dilakukan pada hari ke-30 dengan bakteri Aeromonas hydrophila (106 sel/mm3) secara intramuskular. Hasil penelitian menunjukkan bahwa penambahan vitamin C sebanyak 2.000 mg/kg pakan menyebabkan meningkatnya respon seluler antara lain: total lekosit (34.850 sel/mm3), jenis lekosit (limfosit: 72,2%, monosit: 8,0%, netrofil: 7,7% dan trombosit: 17,6%) indeks fagositik 13% dan respon humoral (titer antibodi: 0,829 unit serum aglutinasi). Kelangsungan hidup ikan jambal Siam dengan respon seluler demikian mencapai 100%. Kata kunci : Vitamin C, imunitas ikan, ikan jambal Siam, Pangasius hypophthalmus.

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Determination of Vitamin C in Various Colours of Bell Pepper (Capsicum annuum L.) by Titration Method

ALCHEMY Jurnal Penelitian Kimia ◽

10.20961/alchemy.14.1.15738.164-178 ◽

2018 ◽

Vol 14 (1) ◽

pp. 164 ◽

Cited By ~ 3

Author(s):

Nerdy Nerdy

Keyword(s):

Immune System ◽

Vitamin C ◽

Human Body ◽

Bell Pepper ◽

Titration Method ◽

Metaphosphoric Acid ◽

Yellow Orange ◽

Different Color ◽

Different Levels

Vitamin C is needed by human body to improve the immune system and can be obtained from the bell pepper. Bell pepper has a different color according to the level of maturity, ranging from green, yellow, orange, and red. Differences in color also make possible differences in vitamin C content. The purpose of this study was to determine vitamin C levels in various colors of bell fruit. Measurement of vitamin C was done by titration method with metaphosphoric acid as the solvent and 2,6 dichloroindophenol as the standardized solution. The samples used were green bell pepper, yellow bell pepper, orange bell pepper, and red bell pepper taken from Gundaling, Berastagi, Karo, Sumatera Utara, 22152, Indonesia. The results show that vitamin C level in various colors of bell pepper respectively, for green bell pepper 16.52 mg vitamin C per 100 g green bell pepper; yellow bell pepper 159.61 vitamin C per 100 g yellow bell pepper; orange bell pepper 121.38 vitamin C per 100g orange bell pepper; red bell pepper 81.19 vitamin C per 100 g red bell pepper. These results indicate that different levels of bell pepper maturity have different vitamin C content.

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Viability of Inga vera Willd. subsp. affinis (DC.) T. D. Penn. embryos according to the maturation stage, fungal incidence, chemical treatment and storage

Journal of Seed Science ◽

10.1590/s2317-15372013000100010 ◽

2013 ◽

Vol 35 (1) ◽

pp. 70-76 ◽

Cited By ~ 12

Author(s):

João José Dias Parisi ◽

João Domingos Biagi ◽

Cláudio José Barbedo ◽

Priscila Fratin Medina

Keyword(s):

Storage Conditions ◽

Maturation Stage ◽

Mature Embryos ◽

Classic Pattern ◽

Physiological Quality ◽

Orthodox Seeds ◽

Two Stages ◽

The Relationship ◽

And Storage ◽

Different Levels

The main strategies for conserving Inga vera seeds during storage consist of their partial dehydration and low temperatures. However, such storage conditions can lead to further deterioration of the seed, either from its own metabolism or the development of microorganisms favored by moisture. In this study, the relationship between fungi and the conservation of I. vera embryos with different levels of hydration and maturity was studied, together with the efficiency of treating with carboxin + thiram (300 mL / 100 kg of embryos) for fungus control. Embryos were collected at two stages (immature and mature) and subjected to two drying levels. A sample of embryos from each stage and drying level was treated with carboxin + thiram. Embryos were then stored at 7 or 25 °C for up to 65 days. It was found that undried, mature embryos have a higher physiological quality than the immature ones after storage at 7 °C for 65 days. The carboxin + thiram treatment is phytotoxic for dried embryos. "Field" fungi develop according to the degree of embryo deterioration, differing from the classic pattern defined for orthodox seeds.

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Changes of total polyphenolics and vitamin C in acerola during storage and spray drying process

The Journal of Agriculture and Development ◽

10.52997/jad.10.03.2018 ◽

2018 ◽

Vol 17 (03) ◽

pp. 69-76

Author(s):

Thien T. Le

Keyword(s):

Vitamin C ◽

Spray Drying ◽

Room Temperature ◽

Frozen Storage ◽

Storage Conditions ◽

Drying Process ◽

Hot Air ◽

Air Temperatures ◽

Significant Difference ◽

Processing Steps

Acerola fruit is known to have a high vitamin C concentration. Polyphenolics are also natural oxidants occurring in plants. Understanding changes of these components during storage conditions and processing steps become important. Results of this research showed that there was significant difference in vitamin C and total polyphenolic concentration and three popular varieties of acerola fruits from Tien Giang province. Concentrations of both vitamin C and polyphenolics reduced rapidly during storage at room temperature. After three days, vitamin C reduced about 40% whereas total polyphenolics reduced about 70%. The losses at refrigerated temperature after 3 days were less than 15% and less than 30%, for vitamin C and total polyphenolics, respectively. Frozen storage of the fruit maintained quite well vitamin C and polyphenolics. Acerola pomace juice was concentrated before spray drying and, at the same vacuum pressure, temperatures influenced significantly the retention of vitamin C and total polyphenolics. Optimization of spray drying conditioners including inlet hot air temperatures and added ratio of maltodextrin (drying carrier) was also carried out to obtain high recovery of dry matter, total polyphenolics and vitamin C.

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