Determination of Oxalic Acid in Foods

Franco, Vincent; Krinitz, Benjamin

doi:10.1093/jaoac/56.1.164

Cited by 12 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oxalic acid was determined on the beet samples according to the method of Moir (1953), modified by measuring the Ca in the Ca oxalate precipitate by atomic absorption. Franco and Krinitz (1973) conducted a collaborative study of the two methods on the analysis of oxalic acid in spinach (Spinacia oleracea L.) and recommended that both methods be adopted as official for the analysis of oxalic acid in spinach. Phytic acid was determined on the immature and mature pea and snap bean seeds by the method of Welch et al (1974).…”

Section: Chemical Analysis Methodsmentioning

confidence: 99%

Nutritional Quality of Vegetable Crops as Affected by Phosphorus and Zinc Fertilizers¹

Peck¹,

Gruñes²,

Welch³

et al. 1980

Agronomy Journal

View full text Add to dashboard Cite

The nutritional quality as well as the yield of the portions of vegetable plants used for human consumption should be considered in fertilization programs. The purpose of this study was to Determine the effects of rates of concentrated superphosphate and zinc sources on some nutritionally important factors including the concentration of P, Zn, phytic acid (myoinositol hexaphosphoric acid), and oxalic acid in the edible portions of four vegetables. The plants, pea (Pisum sativum L.), snap bean [Phaseolus vulgaris (L.) var. humilis], cabbage (Brassica oleracea var. capitata), and table beet (Beta vulgaris L.) were grown on a Honeoye fine sandy loam (Glossoboric Rapludalf, fine loamy, mixed mesic) derived from calcareous glacial till. These crops were fertilized with concentrated superphosphate (CSP) at rates of 0, 30, 60, and 120 kg P/ha, and ZnSO4 or ZnCl2 at rates of 0, 5, 20, and 80 kg Zn/ha applied in a band at planting time in a factorially designed experiment. The plants were sampled at processing stage except that pea and snap bean seeds were also sampled at full maturity. Increasing fertilizer CSP rates increased yields and P concentrations in all crops. Fertilizer CSP increased phytic acid concentrations in immature and mature pea seeds and in mature snap bean seeds. Oxalic acid concentrations in table beet plants decreased with increasing rates of CSP fertilizer. Fertilizer CSP without Zn fertilizer decreased Zn concentrations in the plants, but CSP with Zn fertilizer generally increased Zn concentrations. Fertilizer Zn did not affect yields nor cause visible plant toxicities. However, Zn fertilizer increased Zn concentrations in the plants, especially when applied with high rates of CSP fertilizer. Thus, CSP fertilization without Zn fertilization of vegetable crops can reduce their nutritional quality by lowering their Zn concentrations. However, the concomitant use of Zn fertilizer, with high rates of CSP fertilization, can improve the nutritional quality of vegetable crops with respect to Zn.

show abstract

Section: Chemical Analysis Methodsmentioning

confidence: 99%

Nutritional Quality of Vegetable Crops as Affected by Phosphorus and Zinc Fertilizers¹

Peck¹,

Gruñes²,

Welch³

et al. 1980

Agronomy Journal

View full text Add to dashboard Cite

show abstract

“…The method of Franco and Krinitz (1973) was used for the measurement of oxalate. The procedure consists of sample preparation, oxalic acid precipitation and calcium determination by AAS.…”

Section: Oxalatementioning

confidence: 99%

Influence of Fish on the Bioavailability of Plant Iron in the Anemic Rat

Chao

Gordon

1983

The Journal of Nutrition

View full text Add to dashboard Cite

The effect of fish protein and fish oil on the utilization of endogenous iron in wheat bran, spinach and soy protein isolate was investigated by using the anemic rat as an animal model. Marine products were substituted for casein and corn oil in the diets of these animals. Hemoglobin regeneration was one criteria used to measure iron uptake. Relative biological values (RBV) were computed from a regression equation obtained from control animals receiving graded levels of FeSO4 X 7H2O. The RBV of iron from plant sources provided in diets containing casein-corn oil versus fish-fish oil were: wheat bran, 123 vs. 111%; spinach, 53 vs. 49%; and soybean isolate, 84 vs. 67%; RBV FeSO4 = 100%. These changes were not significant. The decreases in iron absorption from diets containing marine products was attributed to the fish oil. Absorption of exogenous iron (59Fe) was measured in the same animals after the 14-day repletion period. Assimilation of the 59Fe was highly correlated (r2 = 0.958) with hemoglobin level at time of dosing. Diet composition did not appear to have the same effect on the percentage of 59Fe retained after 110 hours by the rat as compared to levels of hemoglobin regeneration (i.e., RBV). A "meat factor" effect was not shown by substituting fish for casein the diets containing plant iron sources fed anemic rats.

show abstract

“…2,16 Oxalic acid was measured by adaptation of the AOAC 974-24 method. 17 Briefly, this started with the extraction of 3 g in 100 ml of 0.5% hydrochloric acid (V:V) in a boiling water bath for 15 mins. Then centrifugation and filtration to separate the precipitate were followed by the addition of an internal standard (tartaric acid or succinic acid).…”

Section: Methodsmentioning

confidence: 99%

Beneficial effects of a prescription home-prepared diet and of zucchini on urine calcium oxalate supersaturation and urinary parameters in adult cats

Blanchard¹,

Amato

André

et al. 2022

Journal of Feline Medicine and Surgery

View full text Add to dashboard Cite

Objectives From the authors’ experience, the consumption of a balanced prescription home-prepared diet that includes zucchini (courgette) benefits cats with recurrent urolithiasis, but there is no published evidence to support this. The aim was to study the effects on urinary parameters of (1) a balanced prescription home-prepared diet containing zucchini, and (2) the addition of zucchini to a dry food, compared with two commercial therapeutic diets. Methods Eight healthy cats were included in a Latin-square designed protocol. Five diets were evaluated: two commercial diets, designed for cats with urinary disorders, one high-moisture (U-WET) and one high-sodium dry (U-DRY); one home-prepared diet (HOME); one commercial dry food for adult maintenance (DRY); and DRY given together with 10 g of zucchini per kg body weight (DRY-Zuc). After a 7-day adaptation period, urine was collected and daily food and water intakes were assessed for 12 days. Urinary parameters, and relative supersaturation (RSS) for calcium oxalate (CaOx) and struvite, were determined. Data underwent repeated measures ANOVA analysis. Results The digestibility of energy, dry matter, protein and fat was highest with the HOME diet. CaOx RSS was lowest in cats eating the HOME diet, but not significantly different from the U-WET or U-DRY diets. CaOx RSS was lower in cats eating the DRY-Zuc diet than in cats eating the DRY diet. Struvite RSS did not differ significantly among groups. Conclusions and relevance This study shows that a balanced prescription home-prepared diet was safe and allowed a very low urinary CaOx RSS. It also showed that adding zucchini to dry food lowered the urine CaOx RSS.

show abstract

Determination of Oxalic Acid in Foods

Cited by 12 publications

References 0 publications

Nutritional Quality of Vegetable Crops as Affected by Phosphorus and Zinc Fertilizers¹

Nutritional Quality of Vegetable Crops as Affected by Phosphorus and Zinc Fertilizers¹

Influence of Fish on the Bioavailability of Plant Iron in the Anemic Rat

Beneficial effects of a prescription home-prepared diet and of zucchini on urine calcium oxalate supersaturation and urinary parameters in adult cats

Contact Info

Product

Resources

About

Determination of Oxalic Acid in Foods

Cited by 12 publications

References 0 publications

Nutritional Quality of Vegetable Crops as Affected by Phosphorus and Zinc Fertilizers1

Nutritional Quality of Vegetable Crops as Affected by Phosphorus and Zinc Fertilizers1

Influence of Fish on the Bioavailability of Plant Iron in the Anemic Rat

Beneficial effects of a prescription home-prepared diet and of zucchini on urine calcium oxalate supersaturation and urinary parameters in adult cats

Contact Info

Product

Resources

About

Nutritional Quality of Vegetable Crops as Affected by Phosphorus and Zinc Fertilizers¹

Nutritional Quality of Vegetable Crops as Affected by Phosphorus and Zinc Fertilizers¹