Riboflavin Requirement Research Articles

Effect of Dietary Riboflavin Levels on Reproductive Performance of Pigeon Breeders, and Growth Performance and Carcass Traits of Offspring Squabs.

This study aimed to investigate the effects of dietary riboflavin levels on the reproductive performance of pigeon breeders and the growth performance and carcass traits of offspring squabs to estimate the riboflavin requirement of pigeon breeders. The natural riboflavin content in the basic diet of corn-peas-soybean-wheat-sorghum-corn gluten is 1.20 mg/kg. Different doses of riboflavin (0, 2.5, 5, 10, and 15 mg/kg) were supplemented with the basal diet to produce five dietary treatments with total riboflavin levels of 1.20, 3.70, 6.20, 10.20, and 16.20 mg/kg. A total of 120 pairs of White King pigeons, aged 60 wks, were randomly allocated into five treatment groups, each consisting of 24 pairs. Each pair was individually raised for 8 wks. After the experiment, an assessment was conducted to evaluate the reproductive performance of the pigeon breeders, as well as the growth and carcass traits of offspring squabs at 28 days of age. The results showed that the dietary riboflavin levels had no significant effect on body weight, feed intake, egg weight, egg production, and egg fertility (p > 0.05). However, pigeons fed a diet without riboflavin had the lowest egg hatchability, egg yolk color, carcass trait, and riboflavin status, while exhibiting higher liver weight and liver index (p < 0.05). Moreover, the indices above showed increased or decreased linearly as the level of riboflavin was increased in the diet. Based on the broken-line regression model, pigeon breeders were determined to require a dietary riboflavin content of 11.4, 13.6, 13.4, 6.60, 4.28, 4.47, 4.67, 6.69, and 6.82 mg/kg to optimize hatchability, eviscerated weight, half-eviscerated weight, breast muscle weight, breast muscle percentage, liver weight, liver index, egg yolk riboflavin, and squab plasma riboflavin, respectively. In conclusion, the optimal supplemental dosage of riboflavin in the diets of pigeon breeders is 13.6 mg/kg.

Riboflavin: a scoping review for Nordic Nutrition Recommendations 2023.

Only a few studies have explored relationships between riboflavin intake and function and a few studies have examined the effects of supplements on various clinical or biochemical outcomes. None of these studies, however, make a useful contribution to understanding requirements in healthy populations. Thus, there is no strong evidence to change the recommendations. The requirement for riboflavin is estimated based on the relationship between intake and biochemical indices of riboflavin status, including urinary excretion and enzyme activities.

From Metabolism to Vitality: Uncovering Riboflavin's Importance in Poultry Nutrition.

Riboflavin, or vitamin B2, is indispensable for poultry, profoundly impacting their metabolic equilibrium, growth, and overall health. In a climate of increasing demand for poultry products and heightened production intensity, grasping the multifaceted roles of riboflavin in domestic fowl nutrition becomes paramount. This essential vitamin serves as a precursor to two vital coenzymes, flavin mononucleotide and flavin adenine dinucleotide, integral players in pivotal redox reactions and energy metabolism. Inadequate riboflavin levels translate into stunted growth, skeletal deformities, and compromised feed conversion efficiency, thereby adversely affecting poultry performance and bottom-line profitability. Riboflavin goes beyond its fundamental role, ameliorating nutrient utilization, facilitating protein synthesis, and augmenting enzyme activity, rightfully earning its epithet as the "growth-promoting vitamin". Poultry's reproductive success intricately hinges on riboflavin levels, dictating egg production and hatchability. It is imperative to note that riboflavin requirements exhibit variations among poultry species and distinct production phases, emphasizing the importance of judicious and balanced supplementation strategies. Aligning dietary recommendations with genetic advancements holds the promise of fostering sustainable growth within the poultry sector. Exploring the multifaceted aspects of riboflavin empowers researchers, nutritionists, and producers to elevate poultry nutrition and overall well-being, harmonizing with the industry's evolving demands.

Dietary Riboflavin Requirement of Pacific White Shrimp (Litopenaeus vannamei).

This study was conducted to determine the dietary riboflavin requirement and its effects on growth performance, feed utilization, innate immunity, and diet digestibility of Litopenaeus vannamei. A riboflavin-free basal diet (R0) was formulated as a control, and six other diets were prepared by adding riboflavin of 10, 20, 30, 40, 50, and 60 mg/kg to the basal diet (designated as R10, R20, R30, R40, R50, and R60, respectively). Quadruplicate groups of shrimp (initial average weight 0.17 ± 0.00 g) were fed the diets six times a day for 8 weeks. Weight gain, specific growth rate, and protein efficiency ratio were significantly increased by riboflavin (p < 0.05). The maximum values were observed in shrimp fed R40 diet. The highest activities of phenoloxidase, nitro blue tetrazolium, superoxide dismutase, and glutathione peroxidase were observed in shrimp fed R40 diet. Lysozyme activity was significantly higher in shrimp fed R30 and R40 diets than that of shrimp fed R60 diet (p < 0.05). Intestinal villi were significantly longer in shrimp fed R50 and R60 diets compared to those of all other groups while the shortest villi were observed in R0 group (p < 0.05). Intestinal villi were clearly distinguished in shrimp fed higher levels of riboflavin compared to those of shrimp fed R0 and R10 diets. Apparent digestibility coefficients of dry matter and protein in diets were not significantly affected by riboflavin levels (p < 0.05). Whole-body proximate composition and hemolymph biochemical parameters were not significantly altered by dietary riboflavin (p < 0.05). Therefore, the results of this study indicate that riboflavin is essential to enhance growth performance, feed utilization, nonspecific immunity, and intestine morphology of shrimp. An optimal riboflavin requirement for the maximum growth of L. vannamei seems to be approximately 40.9 mg/kg diet.

Techno-Functional Assessment of Riboflavin-Enriched Yogurt-Based Fermented Milk Prepared by Supplementing Riboflavin-Producing Probiotic Strains of Lactiplantibacillus plantarum.

Vitamin enrichment in fermented dairy products through the intervention of vitamin-producing probiotic strains during fermentation is a novel approach in the field of probioceuticals. In this study, riboflavin-enriched yogurt-based fermented milk was prepared by mixing 1% (v/v) riboflavin-producing strain [1.2 × 108CFU/mL of Lactiplantibacillus plantarum MTCC 25432 or L. plantarum MTCC 25433 or L. plantarum MTCC 25434] with 2% (v/v) traditional yogurt cultures [Streptococcus thermophilus NCDC 295 and L. delbrueckii subsp. bulgaricus NCDC 293; each of 1.3 × 107CFU/mL]. The yogurt-based fermented milk prepared with traditional yogurt cultures (2%, v/v) was served as a control. The prepared yogurt-based fermented milk samples were analyzed and compared for riboflavin content, antimicrobial activity, physicochemical, and functional properties. As a result, the yogurt-based fermented milk prepared with L. plantarum MTCC 25432 produced a significantly higher amount of riboflavin (2.49mg/L) as compared with MTCC 25433 (2.33mg/L), MTCC 25434 (2.14mg/L), and control (1.70mg/L). The probiotic supplementation to yogurt cultures maintained the pH and titratable acidity in the range of 4.1-4.4 and 1.0-1.05% (lactic acid/100mL), as recommended by Indian yogurt standards. The rheological, texture, and antimicrobial properties of yogurt-based fermented milk were enhanced with the addition of riboflavin-producing probiotic strains. Moreover, all yogurt-based fermented milk samples prepared in this study were acceptable as per the sensory evolution scores. In conclusion, the use of riboflavin-producing L. plantarum strains along with standard yogurt cultures could be the best approach to enhancing riboflavin content in yogurt-based fermented milk and fulfilling the daily riboflavin requirement in humans.

Nutritional status and birth outcomes among pregnant adolescents in Ashanti Region, Ghana

Inadequate nutrition during pregnancy can lead to adverse birth outcomes, and more importantly for pregnant adolescents as they require nutrients to meet their needs for their growth and the fetus. The study examined the relationship between nutritional status and birth outcomes among Ghanaian pregnant adolescents in selected districts of the Ashanti Region, Ghana. In this prospective cohort study, we followed 416 pregnant teenagers recruited at health centers during antenatal care until delivery. We measured weight and height to calculate Body Mass Index (BMI), and Mid-Upper Arm Circumference (MUAC), and nutrient intakes using a repeated 24 hr dietary recall were collected. Hemoglobin (Hb), serum levels of ferritin, prealbumin, vitamin A, Total Antioxidant Capacity (TAC), C-reactive protein (CRP), and Zinc Protoporphyrin (ZPP) were analyzed. Birth outcome data of interest were low birth weight (LBW) and preterm births (PTB). About 15.2 % had LBW, 12.5 % had PTB, and 3.1 % neonatal deaths. The majority of the pregnant adolescents consumed below Estimated Average Requirements (EAR) for thiamin (75.7 %), riboflavin (84.6 %), folate (82.9 %), vitamin A (87.3 %), iron (93.5 %), zinc (83.7 %), and calcium (96.9 %) intakes, while energy (96.6 %), protein (84.6 %), and dietary fiber (74.4 %) were below the Recommended Dietary Allowance (RDA). Anemia and wasting prevalences were 57.1 % and 27.8 %. The mean intakes for carbohydrates ( p = 0.042) and dietary fiber ( p = 0.012) were significantly higher among adolescent mothers with term birth (276.7 ± 111.2 g, 23.7 ± 11.2 g) than those with PTB (237.3 ± 83.7 g, 19.4 ± 9.0 g), respectively. Preterm birth proportions were higher in severely wasted (18.8 %) adolescents than moderately wasted (6.2 %) and normal MUAC (14.0 %) adolescents ( p = 0.184). LBW proportions were higher among anemic (18.1 %) than the non-anemic (12.1 %), among low (30 %) compared with normal (14.9 %) serum ferritin, among low (15.7 %) compared with normal (0 %) serum prealbumin, and among low (16.2 %) compared with normal (11.1 %) serum vitamin A status pregnant adolescents. Pregnant adolescents with moderate wasting had lower odds (Adjusted odds ratio = 0.2, p = 0.017, 95 % confidence interval = 0.1–0.8) of having LBW infants compared with those with normal MUAC. The odds of preterm births were significantly higher among pregnant adolescents with dietary fiber intake below the RDA (Unadjusted OR = 2.8, p = 0.042, 95 % CI = 1.0–7.3). In conclusion, adverse birth outcomes were associated with poor nutritional status among pregnant adolescents studied. • 15.9 % had low birth weight, 12.5 % had preterm birth, 11.5 % had a postpartum hemorrhage, and 3.1 % neonatal deaths. • Majority of the participants had inadequate intakes of energy (81.4 %), protein (77.2 %), riboflavin (88.4 %), folate (93.0 %), vitamins A (97.1 %) and E (97.7 %), iron (97.6 %), and zinc (83.7 %). • Anaemia and wasting prevalence were 57.1 % and 27.8 %. • MUAC (p=0.002), BMI (p=0.015), gestational age (p<0.001) and ZPP (p=0.057) were significantly associated with birth weight.

Demand-oriented riboflavin supply of organic broiler using a feed material from fermentation of Ashbya gossypii

Alternatives to riboflavin (vitamin B2) production by recombinant microorganisms are needed in organic poultry production, but are cost-intensive, so that a demand-oriented riboflavin supply is necessary. Details on the riboflavin requirements of organic poultry are not available. A feed material with high native riboflavin content from fermentation of the filamentous fungus Ashbya gossypii was studied. Two runs with 800 Ranger Gold™ broilers each (40 pens with 20 animals) were conducted. The fattening period was divided into starter (S), grower (G) and finisher (F) stage. In the first run, a basal diet without riboflavin supplementation (NATIVE; 3.27, 3.50 and 3.16 mg riboflavin/kg DM in S, G and F) was compared to diets with supplementation at low (LOW; 5.30, 4.85 and 5.19 mg/kg in S, G and F), medium (MEDIUM; 7.56, 6.88 and 7.56 mg/kg in S, G and F) and high (HIGH; 10.38, 9.14 and 9.93 mg/kg in S, G and F) dosage. In the second run, different combinations of low and medium riboflavin supplementation were used in S, G and F diets: S-LOW (4.50 mg riboflavin/kg DM), G-MEDIUM (6.66 mg/kg), F-MEDIUM (5.71 mg/kg) (Treatment A), S-LOW (4.50 mg riboflavin/kg DM); G-LOW (4.92 mg/kg), F-LOW (4.01 mg/kg) (Treatment B); S-MEDIUM (6.37 mg/kg), G-MEDIUM (7.37 mg/kg), F-MEDIUM (5.07 mg/kg) (Treatment C); S-MEDIUM (6.37 mg/kg), G-LOW (5.28 mg/kg), F-LOW (4.22 mg/kg) (Treatment D). Body weight, feed and water consumption were recorded weekly, health and welfare indicators were scored bi-weekly. Slaughter traits were assessed for five males and females per pen. In the first run, NATIVE animals showed symptoms of riboflavin deficiency and lower live weights in the second week of age. Riboflavin contents of this group were increased to avoid further deficiency and recovery was observed. Feed conversion was better in HIGH (2.07) compared with NATIVE and LOW (2.11). At slaughter, treatments differed neither for foot pad dermatitis nor plumage cleanliness. In the second run, daily weight gains did not differ between treatments in any of the weeks. Feed conversion ranged between 1.99 and 2.04. Riboflavin deficiency was not observed in the second run, while treatment D showed superior economic efficiency. In conclusion, native contents of feed components (3.27 mg/kg DM) were not sufficient to meet the riboflavin demand and a total content of 4.50 mg/kg DM was identified as safe lower threshold. The levels rather according to commercial recommendations were not additionally beneficial to performance and health.

Introduction and Executive Summary of the Supplement, Role of Milk and Dairy Products in Health and Prevention of Noncommunicable Chronic Diseases: A Series of Systematic Reviews

ABSTRACTMilk and dairy products contain multiple nutrients and contribute significantly to meet the nutritional requirements for protein, calcium, magnesium, phosphorus, potassium, zinc, selenium, vitamin A, riboflavin, vitamin B-12, and pantothenic acid. However, consumption of dairy is decreasing and moving away from the advised level in many countries and the potential benefits of milk and dairy products for health have come under question. This, in spite that numerous studies report health benefits associated with dairy consumption. The present supplement aims to assess and summarize scientific evidence regarding the impact of dairy intake on health and all-cause mortality, and on the prevention of diverse chronic diseases, mainly from meta-analyses of observational studies and randomized controlled trials (RCTs). There seem to positive associations between moderate maternal milk intake during pregnancy and infant birth weight, length and bone mineral content during childhood. Moreover, consumption of dairy products in older subjects may reduce the risk of frailty and decrease the risk for sarcopenia. The highest consumption of dairy products did not show a clear association with total osteoporotic fracture and hip fracture risk; however, a diminished risk of vertebral fracture was found. Analysis of the differences between high and low dairy consumption and for dose-response found no association between dairy product consumption and risk of all-cause mortality. Total and low-fat dairy consumption is associated with a reduced risk of developing metabolic syndrome and current evidence supports that consumption of dairy does not adversely affect the risk of cardiovascular outcomes and may even have a subtle protective effect. Moreover, evidence has been provided of an inverse association between the consumption of dairy products and ischemic heart disease and myocardial infarction. Also, the evidence suggests that dairy consumption, particularly low-fat dairy and yogurt is associated with a lower risk of type 2 diabetes. Likewise, moderate compared with medium consumption of dairy is associated lower risk for colorectal and bladder cancer and has no association with prostate cancer. Finally, consumption of milk or dairy products did not show a proinflammatory effect on healthy subjects, overweight/obese individuals, or individuals with other metabolic abnormalities, and fortification of dairy products with phytosterols and ω-3 fatty acids seems to be a good approach to improve cardiometabolic risk biomarkers. In conclusion, the systematic reviews and meta-analyses of the present supplement support adequate milk consumption at various stages of life and in the prevention/control of various noncommunicable chronic diseases.

Dietary riboflavin requirement of fingerlingChanna punctatus(Bloch) based on growth, conversion efficiencies, protein retention, liver riboflavin storage, RNA/DNA ratio and carcass composition

A 16-week experiment was conducted to determine the dietary riboflavin requirement of the fingerling Channa punctatus (6.7 ± 0.85 cm; 4.75 ± 0.72 g) by a feeding casein–gelatin-based (450 g/kg crude protein; 18.39 kJ/g gross energy) purified diet containing graded levels of riboflavin (0, 2, 4, 6, 8, 10 and 12 mg/kg diet) to triplicate groups of fish near to satiation at 09:30 and 16:30 hr. Absolute weight gain (AWG), protein efficiency ratio (PER), specific growth rate (SGR, % per day), protein retention efficiency (PRE%) and RNA/DNA ratio were positively affected by increasing concentrations of dietary riboflavin to 6 mg riboflavin per kg diet. Feed conversion ratio (FCR) decreased up to 6 mg riboflavin per kg diet but did not decrease further with higher riboflavin supplementation. Hepatic thiobarbituric acid-reactive substance (TBARS) concentration also supported the pattern of FCR, whereas superoxide dismutase and catalase activities increased with increasing concentrations of dietary riboflavin from 0 to 6 mg/kg. Liver riboflavin concentrations increased with increasing levels of riboflavin up to 8 mg/kg diet. Broken-line regression analysis of AWG, PRE and liver riboflavin concentrations of fingerling C. punctatus with dietary riboflavin level indicated optimum growth and liver riboflavin saturation at 5.7, 6.1 and 7.7 mg riboflavin per kg diet, respectively.

Plasma riboflavin is a useful marker for studying riboflavin requirement in Chinese male adults

Urinary riboflavin excretion and erythrocyte glutathione reductase activation coefficient are frequently applied in determining riboflavin requirement. Previously, we found that plasma riboflavin is a sensitive marker in the assessment of riboflavin status in rat models. Here, we hypothesize that plasma riboflavin is a useful maker in studying riboflavin requirement. This study examines the changes of fasting plasma riboflavin and urinary riboflavin excretion in response to different riboflavin intake levels in Chinese male adults. The estimated average requirement (EAR) of riboflavin was extrapolated. Seventy-eight participants were randomly divided into the control and 5 riboflavin-supplemented groups. A 6-week riboflavin supplementation was performed at the doses of 0, 0.2, 0.4, 0.6, 0.8, or 1.0 mg daily. The energy expenditure was 15.4 ± 1.9 MJ/d, as estimated by the 24-hour physical activity recording method. Dietary riboflavin intake was 1.0 ± 0.2 mg/d, based on chemical analysis. The fasting plasma riboflavin was increased significantly in a dose-dependent manner when the supplemented riboflavin exceeded 0.4 mg/d and the EAR of riboflavin was suggested to be between 1.3 and 1.5 mg/d. In addition, we found a significant increase in fasting urinary riboflavin excretion when the supplemented riboflavin exceeded 0.6 mg/d. The critical point was calculated as 1.4 mg/d, based on the intersecting point of the 2 regression lines at lower and higher riboflavin intakes. These findings demonstrate that plasma riboflavin is a sensitive marker for riboflavin status, and the EAR of riboflavin for Chinese male adults is 1.4 mg.

Effects of riboflavin supplementation on growth performance, carcass traits, and riboflavin status of growing male white Pekin ducks

An experiment involving six dietary riboflavin concentration (1.38, 2.38, 3.38, 4.38, 5.38, and 6.38mg/kg) was conducted to determine the effects of riboflavin on performance and riboflavin status of growing male white Pekin ducks in terms of growth performance, carcass traits, and free riboflavin, flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD) concentration in the liver and plasma. A basal corn-soybean meal containing 1.38mg/kg of naturally occurring riboflavin was used and this basal diet was fed with 0, 1, 2, 3, 4, and 5mg/kg diet of supplemental riboflavin. One-day-old male white Pekin ducks were fed common starter diets from hatch to 14 days of age and then fed the experimental diets from 15 to 35 days of age. A total of 288 15-day-old ducks were allotted to 6 dietary treatments with 6 replicate pens of 8 birds per pen. At 35 days of age, the average daily weight gain (ADG), average daily feed intake (ADFI), gain to feed ratio (G:F), and percentage yield of breast and leg meat, abdominal fat were examined and free riboflavin, FMN, and FAD in plasma or liver were all analyzed. The growth depression, low plasma free riboflavin, liver free riboflavin, liver FMN, and liver FAD concentration were observed in the ducks fed the riboflavin-deficient basal diet (P<0.05), and these adverse effects were alleviated by riboflavin supplementation. The growing ducks fed the basal diet with no supplementation of riboflavin had the lowest ADG, ADFI, G:F and breast meat yield among all ducks (P<0.05) and these criteria showed linear or quadratic response to increasing dietary riboflavin (P<0.05). On the other hand, dietary riboflavin influenced the status of this vitamin in growing ducks. The poorest growth performance of the riboflavin-deficient growing ducks was accompanied with the lowest content of riboflavin, FAD, and FMN in plasma or liver (P<0.05) but these bad statuses were reversed by increasing dietary riboflavin in which the riboflavin and its derivative increased linearly or quadratically as dietary riboflavin increased (P<0.05). According to the broken-line model, the riboflavin requirements (based on dietary total riboflavin) of male white Pekin ducks from 15 to 35 days of age for ADG, ADFI, G:F, plasma free riboflavin, liver free riboflavin, and liver FMN were 2.43, 2.48, 2.31, 3.57, 2.78, and 2.83mg/kg, respectively.

Human riboflavin requirements, and metabolic consequences of deficiency in man and animals.

Human riboflavin requirements, and metabolic consequences of deficiency in man and animals.

Dietary riboflavin supplementation improve the growth performance and antioxidant status of starter white Pekin ducks fed a corn–soybean meal diets

An experiment was conducted to evaluate the effects of dietary riboflavin on growth performance and antioxidant status of white Pekin ducks from hatch to 21d of age. Different levels crystalline riboflavin (0, 0.7, 1.4, 2.1, 2.8, 3.5, and 7mg/kg) were supplemented to corn–soybean meal basal diet to produce 7 dietary treatments with different analyzed total riboflavin levels (1.69, 2.56, 3.37, 4.05, 4.73, 5.88, and 9.26mg/kg). A total of 448 one-day-old male white Pekin ducks were randomly allotted to 7 dietary treatments with 8 replicate pens of 8 ducks per pen. All ducks were raised in an environmentally controlled duck house from hatch to 21d of age. The mortality rate was 15.5% for ducks fed the diet with no supplementation of riboflavin compared with 0 to 1.6% for those fed the diets supplemented with riboflavin. As dietary riboflavin level increased from 1.69 to 3.37mg/kg, the body weight at 7, 14, and 21d of age, overall average daily gain (ADG), and average daily feed intake (ADFI) increased linearly and quadratically (P<0.001), and gain to feed ratio (G:F) increased quadratically (P=0.003), reaching a plateau at 3.37mg riboflavin/kg for ADG and 4.05mg riboflavin/kg for ADFI and G:F and no response with further increases. The similar responses to increasing dietary riboflavin were also detected in plasma free riboflavin (linear and quadratic, P<0.001), liver free riboflavin (linear and quadratic, P<0.002), and liver flavin mononucleotide (FMN; linear, P=0.001; quadratic, P<0.001) in ducks, which indicated that tissue riboflavin and FMN may be sensitive indicators for riboflavin status. On the other hand, riboflavin deficiency had negative effects on antioxidant capacity of ducks. Compared with ducks fed the riboflavin-supplemented diets, ducks fed the riboflavin-deficient basal diet had greatest plasma malonaldhyde (MDA; linear and quadratic, P<0.005) and liver MDA (linear, P=0.06; quadratic, P=0.001) and lower superoxide dismutase activity in plasma (linear, P=0.027; quadratic, P<0.001) or liver (linear, P=0.008; quadratic, P=0.093). Furthermore, these ill effects may cause liver damage to ducks because the ducks fed basal diet also had the greatest activity of alanine transaminase (linear and quadratic, P<0.035), aspartate transaminase (linear and quadratic, P<0.001), and lactate dehydrogenase (linear, P<0.001). According to broken-line regression analysis, the riboflavin requirement of white Pekin ducks from hatch to 21d of age was estimated to be 3.01, 2.98, 2.79, 4.18, 3.63, and 3.59mg riboflavin/kg for ADG, ADFI, G:F, plasma riboflavin, liver riboflavin, and liver FMN, respectively. In conclusion, corn–soybean meal-based diet is riboflavin-deficient for ducks and supplementation of riboflavin at such levels in these diets could enhance riboflavin and antioxidant status and growth performance of ducks.

Riboflavin Supplementation Improves Energy Metabolism in Mice Exposed to Acute Hypoxia

This study investigated the effects of riboflavin on energy metabolism in hypoxic mice. Kunming mice were fed diets containing riboflavin at doses of 6, 12, 24 and 48 mg/kg, respectively for 2 weeks before exposure to a simulated altitude of 6000 m for 8 h. Changes of riboflavin status and energy metabolism were assessed biochemically. Simultaneously, a (1)H nuclear magnetic resonance (NMR) based metabolomic technique was used to track the changes of plasma metabolic profiling. It was found that the content of hepatic riboflavin was decreased and erythrocyte glutathione activation coefficient was elevated significantly under hypoxic condition. Meanwhile, increased plasma pyruvate, lactate, beta-hydroxybutyrate and urea, as well as decreased plasma carnitine were observed. Riboflavin supplementation improved riboflavin status remarkably in hypoxic mice and decreased plasma levels of pyruvate, free fatty acids and beta-hydroxybutyrate significantly. Plasma carnitine was increased in response to riboflavin supplementation. Results obtained from (1)H NMR analysis were basically in line with the data from biochemical assays and remarkable changes in plasma taurine, choline and some other metabolites were also indicated. It was concluded that riboflavin requirement was increased under acute hypoxic condition and riboflavin supplementation was effective in improving energy metabolism in hypoxic mice.

The physiological role of riboflavin transporter and involvement of FMN-riboswitch in its gene expression in Corynebacterium glutamicum

Riboflavin is a precursor of flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD), which work as cofactors of numerous enzymes. Understanding the supply system of these cofactors in bacteria, particularly those used for industrial production of value added chemicals, is important given the pivotal role the cofactors play in substrate metabolism. In this work, we examined the effect of disruption of riboflavin utilization genes on cell growth, cytoplasmic flavin levels, and expression of riboflavin transporter in Corynebacterium glutamicum. Disruption of the ribA gene that encodes bifunctional GTP cyclohydrolase II/3,4-dihydroxy-2-butanone 4-phosphate synthase in C. glutamicum suppressed growth in the absence of supplemental riboflavin. The growth was fully recovered upon supplementation with 1μM riboflavin, albeit at reduced intracellular concentrations of FMN and FAD during the log phase. Concomitant disruption of the ribA and ribM gene that encodes a riboflavin transporter exacerbated supplemental riboflavin requirement from 1μM to 50μM. RibM expression in FMN-rich cells was about 100-fold lower than that in FMN-limited cells. Mutations in putative FMN-riboswitch present immediately upstream of the ribM gene abolished the FMN response. This 5'UTR sequence of ribM constitutes a functional FMN-riboswitch in C. glutamicum.

Anthropometric and Nutritional Profile of People Living with HIV and AIDS in India: an Assessment.

Background:Importance of nutrition in human immunodeficiency virus (HIV) is well-established; however, the information regarding the diet quality of people living with HIV (PLHIV) especially in India is lacking.Objectives:The objective of this study is to assess the anthropometric and nutritional profile of Indian PLHIV.Material and Methods:The study was performed on 400 adult PLHIV registered at the Antiretroviral Center (ART) center in New Delhi, India. Anthropometric data including height, weight, waist, hip, mid arm, and calf circumferences, were collected; 1-day 24-h dietary recall was done to gather nutrient intake from which nutrient adequacy ratios were computed. Mini Nutritional Assessment (MNA) was also conducted.Results:The mean body mass index (BMI) of the sample was 19.73 ± 3.55 kg/m2 with around 40% having BMI <18.5 kg/m2 . All anthropometric measurements were found to correlate positively and significantly with CD4 count (P < 0.05). The sample consumed poor quality of diet as they could not meet even the 2/3rd of the Indian Council of Medical Research (2010) requirements for energy, protein, calcium, iron, riboflavin, niacin, folic acid, B12, copper, and zinc. Classification of subjects according to MNA indicated that more than 50% of the sample was at-risk of malnutrition and 34% were malnourished. With 40% of sample having BMI less than normal, 50% at risk of malnutrition together with poor nutrient intakes over a long period of time could contribute to further worsening of the nutritional status.Conclusion:There is a need to develop a database on nutritional profile of PLHIV in India which reinforces the need for development of effective strategies to improve their nutritional status.

Genome Sequencing of a Genetically Tractable Pyrococcus furiosus Strain Reveals a Highly Dynamic Genome

The model archaeon Pyrococcus furiosus grows optimally near 100°C on carbohydrates and peptides. Its genome sequence (NCBI) was determined 12 years ago. A genetically tractable strain, COM1, was very recently reported, and here we describe its genome sequence. Of 1,909,827 bp in size, it is 1,571 bp longer (0.1%) than the reference NCBI sequence. The COM1 genome contains numerous chromosomal rearrangements, deletions, and single base changes. COM1 also has 45 full or partial insertion sequences (ISs) compared to 35 in the reference NCBI strain, and these have resulted in the direct deletion or insertional inactivation of 13 genes. Another seven genes were affected by chromosomal deletions and are predicted to be nonfunctional. In addition, the amino acid sequences of another 102 of the 2,134 predicted gene products are different in COM1. These changes potentially impact various cellular functions, including carbohydrate, peptide, and nucleotide metabolism; DNA repair; CRISPR-associated defense; transcriptional regulation; membrane transport; and growth at 72°C. For example, the IS-mediated inactivation of riboflavin synthase in COM1 resulted in a riboflavin requirement for growth. Nevertheless, COM1 grew on cellobiose, malto-oligosaccharides, and peptides in complex and minimal media at 98 and 72°C to the same extent as did both its parent strain and a new culture collection strain (DSMZ 3638). This was in spite of COM1 lacking several metabolic enzymes, including nonphosphorylating glyceraldehyde-3-phosphate dehydrogenase and beta-glucosidase. The P. furiosus genome is therefore of high plasticity, and the availability of the COM1 sequence will be critical for the future studies of this model hyperthermophile.

Vitamin and Mineral Intakes in Adults with Mood Disorders: Comparisons to Nutrition Standards and Associations with Sociodemographic and Clinical Variables

Objective: The purpose of this study was to investigate the nutrient intakes of people with mood disorders.Method: A cross-sectional survey using 3-day food records was carried out in 97 adults with bipolar or major depressive disorder to compare nutrient intakes with Dietary Reference Intakes and British Columbia Nutrition Survey (BCNS) data. Blood levels of selected nutrients were compared to reference ranges. Bivariate and multivariate analyses examined the effects of sociodemographic and clinical variables on nutrient intakes.Results: The average age of respondents was 46 (±13) years; most were women (n = 69) who had less than a university degree (n = 60) and whose incomes were in the government-defined lower range (n = 39). Compared with the BCNS, a larger proportion of the sample was below the estimated average requirement for thiamin (26% vs 8%), riboflavin (21% vs 4%), folate (64% vs 27%), phosphorous (12% vs 1%), and zinc (39% vs 15%; all P < 0.0001), as well as vitamin B6 (25% vs 16%) and vitamin B12 (27% vs 8%; both P < 0.05). Combined intakes of food and supplements helped reduce the prevalence of inadequacy; however, with supplementation, the proportion of participants exceeding the tolerable upper intake levels for niacin, vitamin B6, folate, vitamin C, calcium, magnesium, iron, and zinc ranged from 1%–8%. Income, relationship status, age, gender, and caloric intake were associated with intakes of many nutrients. Types of medications were associated with nutrient intakes, as lower intakes of thiamin and phosphorous (P < 0.05) were found with antidepressant use, higher calcium and iron intakes (P < 0.05) were associated with antianxiety medication use, and magnesium intakes were increased with mood stabilizers (regression coefficient = 52.61, P < 0.05, 95% confidence interval = 0.74 to 104.48).Conclusions: Adults with mood disorders are at risk for many nutrient inadequacies, as well as occasional excesses; social, demographic, and clinical factors may affect their nutrient intakes.

ENVIRONMENTAL temperature and the riboflavin requirement of pigs.

Environmental Temperature and the Riboflavin Requirement of Pigs Get access Nutrition Reviews, Volume 8, Issue 11, November 1950, Pages 336–339, https://doi.org/10.1111/j.1753-4887.1950.tb02338.x Published: 01 November 1950

Riboflavin requirement of rural women and children.

Journal Article Riboflavin Requirement of Rural Women and Children Get access Nutrition Reviews, Volume 40, Issue 10, October 1982, Pages 300–302, https://doi.org/10.1111/j.1753-4887.1982.tb05235.x Published: 01 October 1982